The NEO 2016 WJ1 on 2016-11-25 from Siding Spring - Australia

See The NEO 2016 WJ1 Has Been Removed from the Sentry Risk Table--Neodys Risk Table List 3 Possible Impacts 2106-2115.

NOTE with only 6 days data-arc span there is "little" known about the NEO 2016 WJ1 and the information in this post may become outdated. So one should check the links for updates. Whenever an object is posted to one the risk lists (especially if it has a Torino Scale 1 or greater) and it is observable, observers will take a particular interest in it. In the coming days it is possible there will be more follow-up observations and a search in archives for precovery observations. It is likely this object will be removed from the risk lists.

Background
(as of 2016-11-25) 

• Object: 2016 WJ1 
• Approximate Diameter: 140  m - 320  m (459.318 feet to 1049.87 feet)(Absolute Magnitude: H= 21.338)
• Orbit Type: Apollo [NEO]- Potentially Hazardous Asteroid
• On the Sentry Risk Table: yes  NO
•  NOTE this is NOT a prediction of an impact but rather a statement there is insufficient observational data rule out an impact -- for information read  Understanding Risk Pages by Jon Giorgini
•  Torino Scale(JPL): 1 
• "A routine discovery in which a pass near the Earth is predicted that poses no unusual level of danger. Current calculations show the chance of collision is extremely unlikely with no cause for public attention or public concern. New telescopic observations very likely will lead to re-assignment to Level 0"
• On the NEODyS CLOMON2 risk page: yes
• Torino Scale(NEODyS CLOMON2): 1
• First observation was made: 2016 11 19.46522
• First observed by: Mt. Lemmon Survey (MPC Code G96) The Discovery M.P.E.C.: MPEC 2016-W38 : 2016 WJ1
• Last Observation(publish): 2016 11 25.183886 (by OASI, Nova ItacurubaI (MPC Code Y28)
• Data-Arc Span(publish) : 6 days
• Number of Optical Observations(published): 80
• Observatories Reporting (Published) Observations(MPC Code):
• (246) Klet Observatory-KLENOT,Czech Republic. 
• (291) LPL/Spacewatch II,Arizona,US. 
• (691) Steward Observatory, Kitt Peak-Spacewatch, Arizona,US.
• (926) Tenagra II Observatory, Nogales,Arizona, US. 
• (958) Observatoire de Dax, France.
• (G96) Mt. Lemmon Survey, Arizona,US. 
• (H06) iTelescope Observatory, Mayhill,New Mexico,US.
• (H21) Astronomical Research Observatory, Westfield, Illinois,US.
• (I52) Steward Observatory, Mt. Lemmon Station,Arizona,US.
• (K88) GINOP-KHK, Piszkesteto, Hungary.
• (L04) ROASTERR-1 Observatory, Cluj-Napoca, Romania.
• (Q62) iTelescope Observatory, Siding Spring,NSW,Australia. 
• (T12) Mauna Kea-UH/Tholen NEO Follow-U, Hawaii,US.
• (Y28) OASI, Nova Itacuruba, Brazil.
• Perihelion Distance: 0.6643788245227231 (AU)
• Aphelion Distance: 2.019174401968141 (AU)
• Earth MOID: 0.000357041 AU ( 0.139 (LD)) or 33,189.034 miles (53,412.573 (KM))
• Close-Approach to Earth: Will safely pass Earth on 2016-December-16 at a Nominal Distance of  0.05398437711059 (AU) (21.009 (LD)) or 5,018,161.354 miles (8,075,947.866 (KM))

A image of the NEO 2016 WJ1 on 2016-11-25
from Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)
a stack of 5 - 60 second luminance BIN2 images taken with iTelescope.net's
(TEL T27 0.70-m f/6.6 reflector + CCD)
(C) Steven M. Tilley

A image of the NEO 2016 WJ1 on 2016-11-25
from Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)
a stack of 5 - 60 second luminance BIN2 images taken with iTelescope.net's
(TEL T27 0.70-m f/6.6 reflector + CCD)
(C) Steven M. Tilley

A image of the NEO 2016 WJ1 on 2016-11-25
from Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)
a stack of 5 - 60 second luminance BIN2 images taken with iTelescope.net's
(TEL T27 0.70-m f/6.6 reflector + CCD)
(C) Steven M. Tilley

Useful Links: 

• Space Situational Awareness(ESA) -- 2016 WJ1
• Near Earth Objects Dynamic Site--2016 WJ1
• (MPC) Observations --2016 WJ1
• JPL Orbit Diagram --2016 WJ1
• NEO Earth Close Approaches (JPL) (up coming)
• JPL's NEO Earth Close-Approaches  (Between 1900 A.D. and 2200 A.D- limited to encounters with  reasonably low uncertainty)
• The Tracking News
• NEO Coordination Centre 
• Speed of Light - Space - Distance Calculator
• Asteroid Hazards: The View from Space(MPC)
• Don’t fear apocalyptic asteroids: you’re safer than you think
• Understanding Risk Pages By Jon Giorgini
• Revised asteroid scale aids understanding of impact risk
• Near Earth Objects Scale Helps Risk Communication
• Dealing With the Impact Hazard: An International Project
• The Palermo Technical Impact Hazard Scale
• An Asteroid as Entered the Blogosphere… Should I Be Worried? A commentary by Steven M. Tilley
• International Asteroid Warning Network 
• Impact Risk Assessment: An Introduction - Near-Earth Object Program
• Hazardous NEO Technical Reviews
• Frequently Asked Questions For Impact Risk Assessment 
• How to Find an Impact Orbit for the Earth-Asteroid Collision
• The Asteroid/Comet Impact Hazard
• Whom should we call? Data policy for immediate impactors announcements

The NEO 2016 WJ1 on 2016-11-24 from Siding Spring - Australia

See The NEO 2016 WJ1 Has Been Removed from the Sentry Risk Table--Neodys Risk Table List 3 Possible Impacts 2106-2115.

NOTE with only 4 days data-arc span there is "little" known about the NEO 2016 WJ1 and the information in this post may become outdated. So one should check the links for updates. Whenever an object is posted to one the risk lists (especially if it has a Torino Scale 1 or greater) and it is observable, observers will take a particular interest in it. In the coming days it is possible there will be more follow-up observations and a search in archives for precovery observations. It is likely this object will be removed from the risk lists.

Background
(as of 2016-11-24) 

• Object: 2016 WJ1 
• Approximate Diameter: 140  m - 320  m (459.318 feet to 1049.87 feet)(Absolute Magnitude: H= 21.328)
• Orbit Type: Apollo [NEO]- Potentially Hazardous Asteroid
• On the Sentry Risk Table: yes NO 
•  NOTE this is NOT a prediction of an impact but rather a statement there is insufficient observational data rule out an impact -- for information read  Understanding Risk Pages by Jon Giorgini
•  Torino Scale(JPL): 1 
• "A routine discovery in which a pass near the Earth is predicted that poses no unusual level of danger. Current calculations show the chance of collision is extremely unlikely with no cause for public attention or public concern. New telescopic observations very likely will lead to re-assignment to Level 0"
• On the NEODyS CLOMON2 risk page: yes
• Torino Scale(NEODyS CLOMON2): 1
• First observation was made: 2016 11 19.46522
• First observed by: Mt. Lemmon Survey (MPC Code G96) The Discovery M.P.E.C.: MPEC 2016-W38 : 2016 WJ1
• Last Observation(publish): 2016 11 24.49274 (by LPL/Spacewatch II (MPC Code 291)
• Data-Arc Span(publish) : 5 days
• Number of Optical Observations(published): 68
  
• Perihelion Distance: 0.6646977875617796 (AU)
• Aphelion Distance: 2.016698875781032 (AU)
• Earth MOID: 0.000378886 AU ( 0.147 (LD)) or 35,219.654 miles (56,680.539 (KM))
• Close-Approach to Earth: Will safely pass Earth on 2016-December-16 at a Nominal Distance of  0.0539141743012569 (AU) (20.982 (LD)) or 5,011,635.595 miles (8,065,445.676 (KM))

A image of the NEO 2016 WJ1 on 2016-11-24
from Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)
a stack of 5 - 60 second luminance BIN2 images taken with iTelescope.net's
(TEL T27 0.70-m f/6.6 reflector + CCD)
(C) Steven M. Tilley

  

A image of the NEO 2016 WJ1 on 2016-11-24
from Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)
a stack of 5 - 60 second luminance BIN2 images taken with iTelescope.net's
(TEL T27 0.70-m f/6.6 reflector + CCD)
(C) Steven M. Tilley

Useful Links:

• Space Situational Awareness(ESA) -- 2016 WJ1
• Near Earth Objects Dynamic Site--2016 WJ1
• (MPC) Observations --2016 WJ1
• JPL Orbit Diagram --2016 WJ1
• NEO Earth Close Approaches (JPL) (up coming)
• JPL's NEO Earth Close-Approaches  (Between 1900 A.D. and 2200 A.D- limited to encounters with  reasonably low uncertainty)
• The Tracking News
• NEO Coordination Centre 
• Speed of Light - Space - Distance Calculator
• Asteroid Hazards: The View from Space(MPC)
• Don’t fear apocalyptic asteroids: you’re safer than you think
• Understanding Risk Pages By Jon Giorgini
• Revised asteroid scale aids understanding of impact risk
• Near Earth Objects Scale Helps Risk Communication
• Dealing With the Impact Hazard: An International Project
• The Palermo Technical Impact Hazard Scale
• An Asteroid as Entered the Blogosphere… Should I Be Worried? A commentary by Steven M. Tilley
• International Asteroid Warning Network 
• Impact Risk Assessment: An Introduction - Near-Earth Object Program
• Hazardous NEO Technical Reviews
• Frequently Asked Questions For Impact Risk Assessment 
• How to Find an Impact Orbit for the Earth-Asteroid Collision
• The Asteroid/Comet Impact Hazard
• Whom should we call? Data policy for immediate impactors announcements

The NEO 2016 WJ1 on 2016-11-24

See The NEO 2016 WJ1 Has Been Removed from the Sentry Risk Table--Neodys Risk Table List 3 Possible Impacts 2106-2115.

Background
(as of 2016-11-23) 

• Object: 2016 WJ1 
• Approximate Diameter: 150 m - 330 m (492.126 feet to 1082.68 feet)(Absolute Magnitude: H= 21.303)
• Orbit Type: Apollo [NEO]- Potentially Hazardous Asteroid
• On the Sentry Risk Table: yes NO  NOTE this is NOT a prediction of an impact but rather a statement there is insufficient observational data rule out an impact -- for information read  Understanding Risk Pages by Jon Giorgini
• On the NEODyS CLOMON2 risk page: yes
• First observation was made: 2016 11 19.46522
• First observed by: Mt. Lemmon Survey (MPC Code G96) The Discovery M.P.E.C.: MPEC 2016-W38 : 2016 WJ1
• Last Observation(publish): 2016 11 23.32687 (byTenagra II Observatory, Nogales (MPC Code 926)
• Data-Arc Span(publish) : 4 days
• Number of Optical Observations(published): 56
  
• Perihelion Distance: 0.6659416098880451  (AU)
• Aphelion Distance: 2.008089275410093 (AU)
• Earth MOID: 0.000375787 AU (0.146 (LD)) or 34,931.584 miles (56,216.935 (KM))
• Close-Approach to Earth: Will safely pass Earth on 2016-December-16 at a Nominal Distance of  0.053816832705857 (AU) ( 20.944 (LD)) or 5,002,587.129 miles (8,050,883.58 (KM))

The NEO 2016 WJ1 on 2016-11-24 from Mayhill, New Mexico (New Mexico Skies) (MPC Code H06)
a stack of 10- 60 Second Luminance BIN2 Images taken with iTelescope.net's
(T11 TEL 0.50-m f/6.8 reflector + CCD + f/4.5 focal reducer)
(c) Steven M.Tilley

The NEO 2016 WJ1 on 2016-11-24 from Mayhill, New Mexico (New Mexico Skies) (MPC Code H06)
a stack of 10- 60 Second Luminance BIN2 Images taken with iTelescope.net's
(T11 TEL 0.50-m f/6.8 reflector + CCD + f/4.5 focal reducer)
(c) Steven M.Tilley

The NEO 2016 WJ1 on 2016-11-24 from Mayhill, New Mexico (New Mexico Skies) (MPC Code H06)
a stack of 10- 60 Second Luminance BIN2 Images taken with iTelescope.net's
(T11 TEL 0.50-m f/6.8 reflector + CCD + f/4.5 focal reducer)
(c) Steven M.Tilley

Useful Links:

• Space Situational Awareness(ESA) -- 2016 WJ1
• Near Earth Objects Dynamic Site--2016 WJ1
• (MPC) Observations --2016 WJ1
• JPL Orbit Diagram --2016 WJ1
• NEO Earth Close Approaches (JPL) (up coming)
• JPL's NEO Earth Close-Approaches  (Between 1900 A.D. and 2200 A.D- limited to encounters with  reasonably low uncertainty)
• The Tracking News
• NEO Coordination Centre 
• Speed of Light - Space - Distance Calculator
• Asteroid Hazards: The View from Space(MPC)
• Don’t fear apocalyptic asteroids: you’re safer than you think
• Understanding Risk Pages By Jon Giorgini
• Revised asteroid scale aids understanding of impact risk
• Near Earth Objects Scale Helps Risk Communication
• Dealing With the Impact Hazard: An International Project
• The Palermo Technical Impact Hazard Scale
• An Asteroid as Entered the Blogosphere… Should I Be Worried? A commentary by Steven M. Tilley
• International Asteroid Warning Network

The NEO 2016 WG on 2016-11-23

Background
(as of 2016-11-23) 

• Object: 2016 WG
• Approximate Diameter: 59 m - 130 m (193.57 feet to 426.509 feet)(Absolute Magnitude: H= 23.258)
• Orbit Type: Apollo [NEO]
• On the Sentry Risk Table: yes   NOTE this is NOT a prediction of an impact but rather a statement there is insufficient observational data rule out an impact -- for information read  Understanding Risk Pages by Jon Giorgini
• On the NEODyS CLOMON2 risk page: yes
• First observation was made: 2016 11 18.43559
• First observed by: Mt. Lemmon Survey (MPC Code G96) The Discovery M.P.E.C.: MPEC 2016-W21 : 2016 WG
• Last Observation(publish): 2016 11 23.33429 (by LPL/Spacewatch II (MPC Code 291)
• Data-Arc Span(publish) : 5 days
• Number of Optical Observations(published): 101
• Perihelion Distance: 0.4718660174472272(AU)
• Aphelion Distance: 3.176881868525502 (AU)
• Earth MOID:  0.00171104 AU ( 0.666 (LD)) or 159,051.104 miles (255,967.941 (KM))
• Close-Approach to Earth: Will safely pass Earth on 2016-November-25 at a Nominal Distance of 0.0107875037239381 (AU) (4.198 (LD)) or 1,002,761.117 miles (1,613,787.587 (KM))

The NEO 2016 WG on 2016-11-23 from Mayhill, New Mexico (New Mexico Skies) (MPC Code H06)
a stack of 4- 15 Second Luminance BIN2 Images taken with iTelescope.net's
(T21 TEL 0.43-m f/6.8 reflector + CCD + f/4.5 focal reducer)
(c) Steven M.Tilley

The NEO 2016 WG on 2016-11-23 from Mayhill, New Mexico (New Mexico Skies) (MPC Code H06)
a stack of 4- 15 Second Luminance BIN2 Images taken with iTelescope.net's
(T21 TEL 0.43-m f/6.8 reflector + CCD + f/4.5 focal reducer)
(c) Steven M.Tilley

The NEO 2016 WG on 2016-11-23 from Mayhill, New Mexico (New Mexico Skies) (MPC Code H06)
a stack of 4- 15 Second Luminance BIN2 Images taken with iTelescope.net's
(T21 TEL 0.43-m f/6.8 reflector + CCD + f/4.5 focal reducer)
(c) Steven M.Tilley

Useful Links:

• Space Situational Awareness(ESA) -- 2016 WG
• Near Earth Objects Dynamic Site--2016 WG
• (MPC) Observations --2016 WG
• JPL Orbit Diagram --2016 WG
• NEO Earth Close Approaches (JPL) (up coming)
• JPL's NEO Earth Close-Approaches  (Between 1900 A.D. and 2200 A.D- limited to encounters with  reasonably low uncertainty)
• The Tracking News
• NEO Coordination Centre 
• Speed of Light - Space - Distance Calculator
• Asteroid Hazards: The View from Space(MPC)
• Don’t fear apocalyptic asteroids: you’re safer than you think
• Understanding Risk Pages By Jon Giorgini
• Revised asteroid scale aids understanding of impact risk
• Near Earth Objects Scale Helps Risk Communication
• Dealing With the Impact Hazard: An International Project
• The Palermo Technical Impact Hazard Scale
• An Asteroid as Entered the Blogosphere… Should I Be Worried? A commentary by Steven M. Tilley
• International Asteroid Warning Network

Images of The Asteroid 2016 UG on 2016-11-15 and 2016-11-16

Asteroid(and comet) observing is done by taking a series of images of a section of the night sky over a period of time with a telescope and CCD. Then data reduction is performed on the images looking for moving objects. The observer needs to make two or more observation for each moving object. All “known” objects have a designation, if the observer knows the object’s designation the observation can be reported using the object's designation. If the observer is not trying to identify objects, it is an unknown object or if there is any doubt, an observer-assigned temporary designation is used. The Minor Planet Center’s(MPC) computers check to see if any observations reported  with an observer-assigned temporary designation matchs a “known” objects,  If  any are  "unknown" and its "NEO score is 65” it is posted to “The NEOConfirmation Page”(NEOCP). 

Many observers watch the NEOCP and do follow-up observation on listed objects.   As more observational data comes in better orbital elements can be generated, the "unknown" object may be shown to be a "known" object or shown to be a "new" object. When there are enough observations to generate useful orbital elements the object is assigned a provisional designation by the Minor Planet Center if the object is a NEO, a comet, or unusual a Minor Planet Electronic Circular will be issued.  It is possible over time with additional observational data two or more provisional designations maybe link showing they are the same object.   After four well-observed oppositions for main-belt (two to three for NEOs), asteroids are given a  number ( or their permanent designation and they are eligible to be named by the discoverer).

While many observers will targete NEOs for follow-up observations however other asteroids( i.e., Mars-crossers, main-belt, etc.) may be neglected and over time may become "lost."  On 2016-10-19  a new object was found by Pan-STARRS 1, it was posted to the NEOCP.  Three more observatories submitted observations, and on 2016-10-20.92 it was shown to be a Mars-crossing asteroid and the MPC assigned it the provisional designation 2016 UG.  Since it was not a NEO and pose no danger to Earth, no one targeted it for any follow-up observations.  Then on 2016-11-14 Pan-STARRS 1 reported observations for an object under an observer-assigned temporary designation and it was posted to the NEOCP.  Then observations were reported from two more observatories(including myself), and on 2016-11-16.06 the  "new" NEOCP object was shown to be the Mars-crossing asteroid, 2016 UG  and the orbital elements were updated.

Observations Made Before  the  Object  Was Updates.

A image of the asteroid 2016 UG on 2016-11-15
from Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)
a stack of 5 - 120 second luminance BIN2 images taken with iTelescope.net's
(TEL T27 0.70-m f/6.6 reflector + CCD)
(C) Steven M. Tilley

A image of the asteroid 2016 UG on 2016-11-15
from Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)
a stack of 5 - 120 second luminance BIN2 images taken with iTelescope.net's
(TEL T27 0.70-m f/6.6 reflector + CCD)
(C) Steven M. Tilley

A image of the asteroid 2016 UG on 2016-11-15
from Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)
a stack of 5 - 120 second luminance BIN2 images taken with iTelescope.net's
(TEL T27 0.70-m f/6.6 reflector + CCD)
(C) Steven M. Tilley

A image of the asteroid 2016 UG on 2016-11-15
from Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)
a stack of 15 - 120 second luminance BIN2 images taken with iTelescope.net's
(TEL T27 0.70-m f/6.6 reflector + CCD)
(C) Steven M. Tilley

Observations Made After  the  Object  Was Updates.

A image of the asteroid 2016 UG on 2016-11-16

 from Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)

 a stack of 5 - 120 second luminance BIN2 images taken with iTelescope.net's 

(TEL T27 0.70-m f/6.6 reflector + CCD)

 (C) Steven M. Tilley

A image of the asteroid 2016 UG on 2016-11-16
 from Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)
 a stack of 5 - 120 second luminance BIN2 images taken with iTelescope.net's 
(TEL T27 0.70-m f/6.6 reflector + CCD)
 (C) Steven M. Tilley

A image of the asteroid 2016 UG on 2016-11-16
 from Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)
 a stack of 15 - 120 second luminance BIN2 images taken with iTelescope.net's 
(TEL T27 0.70-m f/6.6 reflector + CCD)
 (C) Steven M. Tilley

Background 

(as of 2016-11-17)

• Object: 2016 UG
• Approximate Diameter: 1 km - 2 km (0.621371 miles to 1.24274 miles) (Absolute Magnitude: H= 17.683)
• Orbit Type: Mars-crossing Asteroid
• First Observation was made: 2016 10 19.51822
• First Observed By: Pan-STARRS 1 (MPC Code F51)
• MPECs
• MPEC 2016-U29 : DAILY ORBIT UPDATE (2016 OCT. 21 UT) 
• MPEC 2016-W01 : DAILY ORBIT UPDATE (2016 NOV. 16 UT)
• MPEC 2016-W03 : DAILY ORBIT UPDATE (2016 NOV. 17 UT)
• Data-Arc Span: 28 days

Other links:

• (MPC) Observations 2016 UG 
• JPL Orbit Diagram 2016 BE 
• Guide to Minor Body Astrometry (MPC)
•  Practical guide on how to observe NEOCP object  by Birtwhistle et al.

Information on the Asteroid (35396) 1997 XF11

The Near Earth Object (35396) 1997 XF11 is notable( or notorious) for the fact it became the center of a media firestorm on 11 March 1998 when an IAU Circular and press information sheet incorrectly stated the possibility of it impacting the Earth in 2028. Within a day new calculations where done showing the probability of Earth impact to be essentially zero. However this was after the news media reported the story and old(or incorrect) news stories have away living for long time(this can be a good thing if research is done right). This is why one should aways look for updates when doing any research. Recently this story has made a comeback in blogosphere. To show that (35396) 1997 XF11 is NOT "Being Hidden From the World" I obtain the publicly available orbit and imaged it from AstroCamp Observatory. Nerpio, Spain (MPC Code I89)...and I fond where it should be. Here is the images, background information, and links on (35396) 1997 XF11.

The Near Earth Objects (35396) 1997 XF11 on 2016-11-01 from AstroCamp Observatory. Nerpio, Spain - (MPC Code I89) using itelescope.net's (T7 TEL 0.43-m f/6.8 reflector + CCD) a stack of 4 - 60 Second Luminance BIN2 Images
(C) Steven M. Tilley

The Near Earth Objects (35396) 1997 XF11 on 2016-11-01 from AstroCamp Observatory. Nerpio, Spain - (MPC Code I89)
using itelescope.net's (T7 TEL 0.43-m f/6.8 reflector + CCD) a stack of 4 - 60 Second Luminance BIN2 Images
(C) Steven M. Tilley

Background 

(as of 2016-11-07)

• Object: (35396) 1997 XF11
• Approximate Diameter: 1.3 km - 2.8 km ( 0.807783 miles to 1.739839  km )(Absolute Magnitude: H=16.9)
• Orbit Type: Apollo [NEO] Potentially Hazardous Asteroid
• On the Sentry Risk Table: No
• On the NEODyS CLOMON2 risk page: No
• First(Precovery) Observation was Made: 1990 03 22.44427
• First(Precovery) Observed By: Palomar Mountain (MPC Code 675)
• Discovery Observation was Made: 1997 12 06.47227
• Discovery Observation was Made By: Steward Observatory, Kitt Peak-Spacewatch (MPC Code 691) The Discovery M.P.E.C.: MPEC 1997-Y11 : 1997 XF11
• Last Observation(publish): 2016 11 04.83358  (by Purple Mountain Observatory, XuYi Station, China (MPC Code D29))
• Data-Arc Span(publish) : 9724 days (26.62 yr)
• Number of Optical Observations(published): 1595
• Radar observations: 6
• Observatories Reporting (Published) Observations(MPC Code):
• (006) Fabra Observatory, Barcelona, Spain.
• (046) Klet Observatory, Ceske Budejovice, Czech Republic.
• (057) Belgrade, Serbia.
• (073) Bucharest, Romania.
• (084) Pulkovo, Russia
• (104) San Marcello Pistoiese, Italy.
• (106) Crni Vrh, Slovenia
• (118) Astronomical and Geophysical Observatory, Modra, Slovakia.
• (127) Bornheim, Germany
• (130) Lumezzane, Italy.
• (151) Eschenberg Observatory, Winterthur, Switzerland.
• (160) Castelmartini,Italy.
• (168) Kourovskaya, Russia.
• (176) Observatorio Astronomico de Consell, Spain.
• (185) Observatoire Astronomique Jurassien-Vicques, Switzerland.
• (204) Schiaparelli Observatory,Italy
• (213) Observatorio Montcabre, Spain
• (251) Arecibo, Puerto Rico,US
• (253) Goldstone DSS 14, Fort Irwin, California, US
• (291) LPL/Spacewatch II, Arizona,US
• (333) Desert Eagle Observatory,Arizona, US
• (360) Kuma Kogen, Japan
• (379) Hamamatsu-Yuto, Japan
• (402) Dynic Astronomical Observatory,Japan
• (413) Siding Spring Observatory,NSW, Australia
• (422) Loomberah, NSW, Australia
• (428) Reedy Creek,QLD,Australia.
• (474) Mount John Observatory, Lake Tekapo, New Zealand.
• (557) Ondrejov, Czech Republic
• (568) Mauna Kea, Hawaii, US
• (587) Sormano, Italy
• (608) Haleakala-AMOS, Hawaii, US
• (644) Palomar Mountain/NEAT, Arizona, US
• (658) National Research Council of Canada, Brit, Columbia, Canada
• (670) Camarillo,Arizona,US
• (675) Palomar Mountain, Arizona,US
• (691) Steward Observatory, Kitt Peak-Spacewatch, Arizona, US
• (696) Whipple Observatory, Mt. Hopkins, Arizona, US
• (699) Lowell Observatory-LONEOS, Arizona,US
• (703) Catalina Sky Survey, Arizona,US
• (704) Lincoln Laboratory ETS, New Mexico, US
• (705) Apache Point,New Mexico, US
• (711) McDonald Observatory, Fort Davis,Texas,US.
• (807) Cerro Tololo Observatory, La Serena, Chile.
• (809) European Southern Observatory, La Silla, Chile.
• (897) YGCO Chiyoda Station, Japan.
• (900) Moriyama, Japan.
• (921) SW Institute for Space Research, Cloudcroft  New Mexico,US
• (932) John J. McCarthy Obs., New Milford, Connecticut,US
• (938) Linhaceira,Portugal.
• (940) Waterlooville, UK.
• (941) Observatorio Pla D'Arguines, Spain.
• (952) Marxuquera, Spain.
• (954) Teide Observatory,Canary Islands (Spain).
• (A30) Crespadoro,Italy.
• (B67) Sternwarte Mirasteilas, Falera, Switzerland.
• (C00) Velikie Luki, Russian.
• (C20) Kislovodsk Mtn. Astronomical Stn., Pulkovo Obs., Russia.
• (C51) WISE.
• (D25) Tzec Maun Observatory, Pingell (before 2010),WA, Australia.
• (D29) Purple Mountain Observatory, XuYi Station, China.
• (E12) Siding Spring Survey, NSW, Australia
• (F51) Pan-STARRS 1, Haleakala, Hawaii, US
• (G34) Oberfrauendorf, Germany.
• (G36) Calar Alto-CASADO, Spain.
• (G45) Space Surveillance Telescope, Atom Site, New Mexico, US
• (G92) Jarnac Observatory, Vail, Arizona,US
• (G96) Mt. Lemmon Survey, Arizona, US
• (H21) Astronomical Research Observatory, Westfield, Illinois, US
• (H23) Pear Tree Observatory, Valparaiso , Florida, US
• (H45) Arkansas Sky Obs., Petit Jean Mountain South, Arkansas, US
• (H79) York University Observatory, Toronto, Canada/Ontario.
• (I20) Observatorio Astronomico Salvador, Rio Cuarto, Argentina.
• (J16) An Carraig Observatory, Loughinisland, UK.
• (J19) El Maestrat, Spain.
• (J75) OAM Observatory, La Sagra, Spain.
• (J93) Mount Tuffley Observatory, Gloucester, UK.
• (J94) Abbeydale, UK.
• (K38) M57 Observatory, Saltrio, Italy.
• (K63) G. Pascoli Observatory, Castelvecchio Pascoli, Italy.
• (Q62) iTelescope Observatory, Siding Spring, NSW, Australia.
• (T05) ATLAS-HKO, Haleakala, Hawaii, US
• (V78) Spirit Marsh Observatory. Sauk Centre, Minnesota, US
• (V83) Rolling Hills Observatory, Warrensburg, Missouri, US
• (W19) Kalamazoo, Michigan, US
• (Y00) SONEAR Observatory, Oliveira (S20.71513 W44.78496) Brazil.
• Perihelion Distance: 0.7445669829462876 (AU)
• Aphelion Distance: 2.141039135154752 (AU)
• Earth MOID:  0.000392071 AU ( 0.153 (LD)) or 36,445.276 miles (58,652.987 (KM))
• Last Close-Approach to Earth: Passed the Earth on 2016-June-10 at a Nominal Distance of  0.179984750131334 (AU), (70.045 Lunar Distance (LD)), 16,730,627.744 or miles (26,925,335.376 (KM))
•  Close-Approach to Venus: Will pass Venus on 2021-September-17 at Nominal Distance of  0.0932504234507136 (AU) (36.29  (LD)) or 8,668,168.39 miles (13,950,064.789 (KM))
• Close-Approach to Earth: Will safely pass Earth on 2021-November-18 at Nominal Distance of  0.443542182988942 (AU) (172.614 (LD)) or 41,229,821.677 miles (66,352,966.137 (KM))
• Close-Approach to Earth: Will safely pass Earth on  2023-May-05 at Nominal Distance of  0.241774173444771 (AU) (94.092 (LD)) or  miles 22,474,313.469 ( 36,168,901.535 (KM))
• Close-Approach to Earth: Will safely pass Earth on  2028-October-26 at Nominal Distance of 0.00621153684077898 (AU) (2.417 (LD)) or 577,398.421  miles  (929,232.685 (KM))
• Close-Approach to The Moon: Will safely pass Moon on 2028-October-26 at Nominal Distance of  0.00886650062640578 (AU)(3.451 (LD)) or 824,192.723 miles  (1,326,409.614(KM))
• Useful Links:
• Space Situational Awareness(ESA) -- (35396) 1997 XF11
• Near Earth Objects Dynamic Site--(35396) 1997 XF11
• (MPC) Observations --(35396) 1997 XF11
• JPL Orbit Diagram --(35396) 1997 XF11
• NEO Earth Close Approaches (JPL) (up coming)
• JPL's NEO Earth Close-Approaches  (Between 1900 A.D. and 2200 A.D- limited to encounters with  reasonably low uncertainty)
• The Tracking News
• NEO Coordination Centre 
• Speed of Light - Space - Distance Calculator
• Asteroid Hazards: The View from Space(MPC)
• Don’t fear apocalyptic asteroids: you’re safer than you think
• Understanding Risk Pages By Jon Giorgini
• Revised asteroid scale aids understanding of impact risk
• Near Earth Objects Scale Helps Risk Communication
• Dealing With the Impact Hazard: An International Project
• The Palermo Technical Impact Hazard Scale
• An Asteroid as Entered the Blogosphere… Should I Be Worried? A commentary by Steven M. Tilley
• Asteroid 1997 XF11 from the WIYN
• One-Mile-Wide Asteroid to Pass Close to the Earth in 2028  (1998 March 11, updated  1998 March 12)
• Asteroid Is Expected to Make A Pass Close to Earth in 2028 (New York Times, March 12, 1998)
• Asteroid Will Miss Earth By "Comfortable Distance" In 2028 (JPL's press release.)
• IAU Statement prepared by Dr. David Morrison, 14 March 1998 (Internet Archive)
• How the Asteroid Story Hit: An Astronomer Reveals How a Discovery Spun Out of Control 
• Prediscovery Ephemerides for 1997 XF11
• IAUC 6837: 1997 XF11; C/1997 W2, C/1998 E1
• IAUC 6839: 1997 XF11 - Central Bureau for Astronomical Telegrams
• IAUC 6879: P/1998 G1; C/1998 G2; 1997 XF11
• Asteroid 1997 XF11 - Near-Earth Object Program - NASA
• Spacewatch discovery of 1997 XF11
• 1997 XF11 – the true story 
• The Asteroid/Comet Impact Hazard
• Whom should we call? Data policy for immediate impactors announcements
• Rotation period and spin direction of near-Earth asteroid (35396) 1997 XF11
• Motion of the Dangerous Asteroid 1997 XF₁₁
• How to Find an Impact Orbit for the Earth-Asteroid Collision
• (35396) 1997 XF11 (Wikipedia)
• NASA: There is No Asteroid Threatening Earth
• Impact Risk Assessment: An Introduction - Near-Earth Object Program
• Hazardous NEO Technical Reviews
• Frequently Asked Questions For Impact Risk Assessment 
• 1997XF11 Ephemerides for 26 Oct 2028--NEODyS (Near Earth Objects - Dynamic Site
   

Confirmation Images of the Asteroid 2016 VC1

 Background

(as of 2016-11-06)

•  Object:  2016 VC1
• Approximate Diameter:  130 m - 290 m  ( 426.509 feet to  951.444  feet)(Absolute Magnitude:  H= 21.576 )
• Orbit Type: Apollo [NEO]  Potentially Hazardous Asteroid
• On the Sentry Risk Table:  NO
• On the NEODyS CLOMON2 risk page: No 
• First Observation was made: 2016 11 02.59825
• First Observed  By: Purple Mountain Observatory, XuYi Station, China (MPC Code D29)  The Discovery M.P.E.C.: MPEC 2016-V47 : 2016 VC1
• Last Observation was made(publish): 2016 11 06.85421  (by Bernezzo Observatory (MPC Code C77))
• Data-Arc Span(publish) : 4 days
• Number of Observations(published): 69
• Perihelion Distance:  0.7144718474842521(AU)
• Aphelion Distance: 3.872523314277046 (AU)
• Earth MOID:  0.0356285 AU ( 13.866 (LD)) or  3,311,875.979  miles (5,329,947.736 (KM))
• Next Close-Approach to Earth: Will safely pass Earth on 2016-Nov-22 at Nominal Distance of 0.0451994363061197  (AU) ( 17.59 (LD)) or  4,201,550.09  miles (6,761,739.428  (KM))

 



A confirmation image of the Near Earth Object 2016 VC1
on 2016-11-04 from Auberry California USA - (MPC Code U69)
a stack of 5 - 60 Second Luminance BIN2 Images using
itelescope.net's (t24 TEL 0.61-m f/6.5 reflector + CCD)
(C) Steven M. Tilley



A confirmation image of the Near Earth Object 2016 VC1
on 2016-11-04 from Auberry California USA - (MPC Code U69)
a stack of 5 - 60 Second Luminance BIN2 Images using
itelescope.net's (t24 TEL 0.61-m f/6.5 reflector + CCD)
(C) Steven M. Tilley



A confirmation image of the Near Earth Object 2016 VC1
on 2016-11-04 from Auberry California USA - (MPC Code U69)
a stack of 5 - 60 Second Luminance BIN2 Images using
itelescope.net's (t24 TEL 0.61-m f/6.5 reflector + CCD)
(C) Steven M. Tilley



A confirmation image of the Near Earth Object 2016 VC1
on 2016-11-04 from Auberry California USA - (MPC Code U69)
a stack of 5 - 60 Second Luminance BIN2 Images using
itelescope.net's (t24 TEL 0.61-m f/6.5 reflector + CCD)
(C) Steven M. Tilley



A confirmation image of the Near Earth Object 2016 VC1
on 2016-11-05 from Auberry California USA - (MPC Code U69)
a stack of 9 - 60 Second Luminance BIN2 Images using
itelescope.net's (t24 TEL 0.61-m f/6.5 reflector + CCD)
(C) Steven M. Tilley



A confirmation image of the Near Earth Object 2016 VC1
on 2016-11-05 from Auberry California USA - (MPC Code U69)
a stack of 9 - 60 Second Luminance BIN2 Images using
itelescope.net's (t24 TEL 0.61-m f/6.5 reflector + CCD)
(C) Steven M. Tilley



A confirmation image of the Near Earth Object 2016 VC1
on 2016-11-05 from Auberry California USA - (MPC Code U69)
a stack of 9 - 60 Second Luminance BIN2 Images using
itelescope.net's (t24 TEL 0.61-m f/6.5 reflector + CCD)
(C) Steven M. Tilley


Other links:

• Near Earth Objects Dynamic Site--2016 VC1
• (MPC) Observations 2016 VC1 
• JPL Orbit Diagram 2016 VC1 
• NEO Earth Close Approaches (JPL)
• The Tracking News 
• NEO Coordination Centre 
• Speed of Light - Space - Distance Calculator
• Asteroid Hazards: The View from Space(MPC) 
• Understanding Risk Pages By Jon Giorgini
•  An Asteroid as Entered the Blogosphere… Should I Be Worried? A commentary by Steven M. Tilley
•  Don’t fear apocalyptic asteroids: you’re safer than you think