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Showing posts with label JPL NEO Program Sentry. Show all posts
Showing posts with label JPL NEO Program Sentry. Show all posts

Sep 25, 2016

An Asteroid as Entered the Blogosphere… Should I Be Worried?

A commentary by Steven M. Tilley

The Asteroid to Earth "Say out my Way!!!!"
Earth to the Asteroid "Watch where you're going ... fool!!!"
 Image edited by Steven M. Tilley
(Disclaimer --  Earth and
asteroids CAN NOT talk)
 see the original (public domain) image
Planetoid crashing into primordial Earth  at
 Donald Davis' official site
About every few month or so an asteroid makes waves online.  This lead some people to panic. Before anyone panics and does something dumb. One should remember one of the secrets to life, breathe, in and out. Then remember anyone can post anything online. Some sources are better than others when it comes to asteroid information. Sources range from very useful to worse than useless.

First check for reliable information from some of the reliable sources such as the Minor Planet Center, NASA NEO Program Office at JPL, ESA's NEODyS (Near Earth Objects Dynamic Site), or The Tracking News.  The writer of this blog post is aware that are many people in the blogosphere who distrusts one or more of the name reliable sources.  The author suggests that they reexamine their stand. A significant number of individuals and organizations from around the world observe asteroids; these observations serve as a cross check. If someone or a group makes an error, the error would soon come to light with more observations. If there is nothing about the asteroid  from the name from reliable sources most likely, the story probably is wrong. 

Another thing to remember as a story moves through the blogosphere it changes like the "telephone game." The original story is misread, poorly translated, misunderstood, etc. then rewritten by other writers with the wrong information.  Then other writers then use the revised story as a source for new stories adding to the madness. One should seek out the original story(and see if it is reliable).

When reading up ( and writing) about asteroids one should know the limits of one's knowledge base.  Some of bloggers and youtbers out there go way outside of their knowledge base; they think they "know" when they don't  "know."  The problem is many people mistakenly repost "wrong" blog posts(and videos) adding to the madness. Just because something has been shared, many times does not make it true.

It should be stated that no post is complete without a "good" headline and an image to hook readers. Many times the picture is wrong, and the headline is highly misleading.  It takes lots of time to find a picture of the asteroid or use a telescope to image the asteroid in question.  This requirement of time will lead many writers to find any old image of any old asteroid. Many times if the author used a real picture of the asteroid internet users would not click.

Finally one should keep studying about asteroid there so much to know. One should not be afraid seeking good answers to questions. Just look for good sources of information. 

Feb 3, 2016

The NEO 2016 BA14 on 2016 02 01

 Background
(as of 2016-02-02)
 Astrometrica object verification window with a stack of 25- 120 Second Luminance BIN2 Images taken with iTelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD)  at (MPC Code Q62) Siding Spring NSW Australia NOTE: there is an "digital artifact" in  image number 6
 Astrometrica object verification window with a(1 of 5) stack of 5- 120 Second Luminance BIN2 images taken with iTelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD)  at (MPC Code Q62) Siding Spring NSW Australia
 Astrometrica object verification window with a (2 of 5) stack of 5- 120 Second Luminance BIN2 images taken with iTelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD)  at (MPC Code Q62) Siding Spring NSW Australia. NOTE: there is an "digital artifact" in one of the  images so this observation was NOT submitted.
 Astrometrica object verification window with a (3 of 5) stack of 5- 120 Second Luminance BIN2 images taken with iTelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD)  at (MPC Code Q62) Siding Spring NSW Australia.

 Astrometrica object verification window with a (4 of 5) stack of 5- 120 Second Luminance BIN2 images taken with iTelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD)  at (MPC Code Q62) Siding Spring NSW Australia.
 Astrometrica object verification window with a (5 of 5) stack of 5- 120 Second Luminance BIN2 images taken with iTelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD)  at (MPC Code Q62) Siding Spring NSW Australia.
Other links:
     

Jan 29, 2016

The Asteroid 2016 BE on 2016-01-29

 Background
(as of 2016-01-29 14:50 UTC)
(Note this post was mabe before the Daily Orbit Update  therefor  some of the infomation here may quickly become out dated) 
 Astrometrica object verification window with a(1 of 3) stack of 13- 15 Second Luminance BIN2 Images taken with iTelescope.net's (TEL T11 0.50-m f/6.8 astrograph + CCD + f/4.5 focal reducer) at (MPC Code H06) Mayhill, New Mexico (New Mexico Skies)
 Astrometrica object verification window with a(2 of 3) stack of 13- 15 Second Luminance BIN2 Images taken with iTelescope.net's (TEL T11 0.50-m f/6.8 astrograph + CCD + f/4.5 focal reducer) at (MPC Code H06) Mayhill, New Mexico (New Mexico Skies)
 Astrometrica object verification window with a(3 of 3) stack of 13- 15 Second Luminance BIN2 Images taken with iTelescope.net's (TEL T11 0.50-m f/6.8 astrograph + CCD + f/4.5 focal reducer) at (MPC Code H06) Mayhill, New Mexico (New Mexico Skies)
 Other links:


Jan 25, 2016

The Asteroid 2016 BE on 2016-01-25

 Background
(as of 2016-01-25 06:30 UTC)
(Some of the infomation here may quickly become out dated) 
 Astrometrica object verification windows with a(1 of 4) stack of 22 - 15 Second Luminance BIN2 Images taken with iTelescope.net's (TEL T7 0.43-m f/6.8 astrograph + CCD) at (MPC Code I89) AstroCamp Observatory. Nerpio, Spain
 Astrometrica object verification windows with a(2 of 4) stack of 22 - 15 Second Luminance BIN2 Images taken with iTelescope.net's (TEL T7 0.43-m f/6.8 astrograph + CCD) at (MPC Code I89) AstroCamp Observatory. Nerpio, Spain
 Astrometrica object verification windows with a(3 of 4) stack of 22 - 15 Second Luminance BIN2 Images taken with iTelescope.net's (TEL T7 0.43-m f/6.8 astrograph + CCD) at (MPC Code I89) AstroCamp Observatory. Nerpio, Spain
 Astrometrica object verification windows with a(1 of 4) stack of 22 - 15 Second Luminance BIN2 Images taken with iTelescope.net's (TEL T7 0.43-m f/6.8 astrograph + CCD) at (MPC Code I89) AstroCamp Observatory. Nerpio, Spain
Other links:

Jan 21, 2016

The Asteroid 2016 BE on 2016-01-20

 Background
(as of 2016-01-21  14:40 UTC)
(Some of the infomation here may quickly become out dated) 
 Astrometrica object verification window with a(1 of 3) stack of 12- 60 Second Luminance BIN2 Images taken with iTelescope.net's (TEL T11 0.50-m f/6.8 astrograph + CCD + f/4.5 focal reducer) at (MPC Code H06) Mayhill, New Mexico (New Mexico Skies)(2016-01-20)
 Astrometrica object verification window with a(2 of 3) stack of 12- 60 Second Luminance BIN2 Images taken with iTelescope.net's (TEL T11 0.50-m f/6.8 astrograph + CCD + f/4.5 focal reducer) at (MPC Code H06) Mayhill, New Mexico (New Mexico Skies)(2016-01-20)
 Astrometrica object verification window with a(3 of 3) stack of 12- 60 Second Luminance BIN2 Images taken with iTelescope.net's (TEL T11 0.50-m f/6.8 astrograph + CCD + f/4.5 focal reducer) at (MPC Code H06) Mayhill, New Mexico (New Mexico Skies)(2016-01-20)
Other links:

Jan 11, 2016

The NEO 2015 YC2 on 2016-01-10



 Background
(as of 2016-01-11)
  •  Object: 2015 YC2
  • Approximate Diameter: 56 m - 120 m (183.727 feet to 393.701 feet) ( Absolute Magnitude:  H= 23.4 )
  •  Orbit Type:  Apollo 
  •  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 infomation read  Understanding Risk Pages by Jon Giorgini
  • On the NEODyS CLOMON2 risk page: Yes
  • First Observed  on: 2015 12 19.27013
  • First Observed  By: Mt. Lemmon Survey (MPC Code G96) ,  (The Discovery M.P.E.C.: MPEC 2015-Y67 : 2015 YC2)
  •  Last Observed: 2016 01 11.36839
  •  Data-Arc Span: 23 day
  •  Number Oppositions : 1
  •  Number of Observations Made:  90
  • Next Close-Approach:  Will safely pass Earth on  2016-Jan-15 at  Nominal Distance of 0.0126600709130298 AU (4.93 (LD)) or1,176,827.112  miles or (1,893,919.651 KM)
(1 of 3) Stacks of 8 - 15 Second Luminance BIN2 images taken with  itelescope.net's (TEL T11 0.50-m f/6.8 astrograph + CCD + f/4.5 focal reducer)
(2 of 3) Stacks of 8 - 15 Second Luminance BIN2 images taken with  itelescope.net's (TEL T11 0.50-m f/6.8 astrograph + CCD + f/4.5 focal reducer)
(3 of 3) Stacks of 8 - 15 Second Luminance BIN2 images taken with  itelescope.net's (TEL T11 0.50-m f/6.8 astrograph + CCD + f/4.5 focal reducer)

(1 of 3) Stacks of 15 - 15 Second Luminance BIN2 images taken with Using itelescope.net's (TEL T21 0.43-m f/6.8 astrograph + CCD + f/4.5 focal reducer)

(2 of 3) Stacks of 15 - 15 Second Luminance BIN2 images taken with Using itelescope.net's (TEL T21 0.43-m f/6.8 astrograph + CCD + f/4.5 focal reducer)
(3 of 3) Stacks of 15 - 15 Second Luminance BIN2 images taken with Using itelescope.net's (TEL T21 0.43-m f/6.8 astrograph + CCD + f/4.5 focal reducer)
Other links:

Aug 31, 2015

The Asteroid 2015 PU228 on 2015-08-24 Video



The Asteroid 2015 PU228 on 2015-08-24
Orbit Type:  Apollo [NEO, PHA]
3 stack of  5- 60  Second Luminance BIN2
Images taken with itelescope.net's
(TEL T7 0.43-m f/6.8 astrograph + CCD)
at AstroCamp Observatory. Nerpio, Spain 
(MPC Code  I89)
on  2015-08-24 from 02:00 to 02:57 UTC

 for more infomation  go to The Asteroid 2015 PU228 on 2015-08-24


(C) Steven M. Tilley

Note at time of upload 2015 PU228 is  listed on the "Sentry Risk Table"  and the  "NEODyS CLOMON2 risk page"  as  Torino Scale   1. 

HOWEVER this  is NOT a prediction of an  impact  but rather a statement there is insufficient observational data rule out  an impact on 2081-01-15.40  With additional observations this asteroid  will likely  be re-assignment to Torino Scale   0.

Torino Scale

at the time of upload the chance the asteroid will MISS the Earth is 99.9928%


For more infomation read  "Understanding Risk Pages" by Jon Giorgini

Aug 28, 2015

The Asteroid 2015 NK13 on 2015-08-27

 Background
(as of 2015-08-27)
  •  Object: 2015 NK13
  • Approximate Diameter: 190 m - 430 m (623.36 feet to 1410.761 feet) ( Absolute Magnitude:  H= 20.7 )
  •  Orbit Type:  Apollo [ PHA] 
  •  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 infomation read  Understanding Risk Pages by Jon Giorgini
  • On the NEODyS CLOMON2 risk page: Yes
  • First Observed  on: 2015 07 08.542262
  • First Observed  By: Pan-STARRS 1 (MPC Code F51) ,   (The Discovery M.P.E.C.: MPEC 2015-N44 : 2015 NK13)
  •  Last Observed: 2015 08 26.83446
  •  Data-Arc Span: 49
  •  Number Oppositions : 1
  •  Number of Observations Made:  208
  • Next Close-Approach:  Will safely pass Earth on  2015-Sep-15 at  Nominal Distance of  0.100074473278037 AU ( 38.946 (LD)) or 14,970,928.113 miles or (14,970,928.113 KM)

Observing Run of 2015 NK13  on 2015-08-26 from Nerpio Spain
On 2015-08-22  I  ran a series of 45 -- 60 Second Luminance BIN2 Images on itelescope.net's (TEL T7 0.43-m f/6.8 astrograph + CCD) at AstroCamp Observatory. Nerpio, Spain  (MPC Code  I89)  and created 3 stacks of  7  images ( working stars)

Astrometrica object verification window a stack (1of 3)  of  7- 60  Second Luminance BIN2 Images taken with itelescope.net's  (TEL T7 0.43-m f/6.8 astrograph + CCD)  at AstroCamp Observatory. Nerpio, Spain  (MPC Code  I89)
Astrometrica object verification window a stack (2of 3)  of  7- 60  Second Luminance BIN2 Images taken with itelescope.net's  (TEL T7 0.43-m f/6.8 astrograph + CCD)  at AstroCamp Observatory. Nerpio, Spain  (MPC Code  I89)
Astrometrica object verification window a stack (3 of 3)  of  7- 60  Second Luminance BIN2 Images taken with itelescope.net's  (TEL T7 0.43-m f/6.8 astrograph + CCD)  at AstroCamp Observatory. Nerpio, Spain  (MPC Code  I89)

Aug 25, 2015

The Asteroid 2015 PU228 on 2015-08-24

 Background
(as of 2015-08-24)
  •  Object:  2015 PU228
  • Approximate Diameter: 0.330 km (656.168 feet to 1476.378 feet) ( Absolute Magnitude:  H= 20.0)
  •  Orbit Type:  Apollo [ PHA] 
  •  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 more infomation read  Understanding Risk Pages by Jon Giorgini
  • JPL's Torino Scale:   1 -- with additional observations this asteroid  will likely  be re-assignment to Level 0.
  •  JPL's Maximum Impact Probability: chance of Earth impact 1 in 59,000 or 99.99830000% chance the asteroid will MISS the Earth 
  • On the NEODyS CLOMON2 risk page: Yes
  • NEODyS'  Torino Scale:  
  •  NEODyS' Maximum Impact Probability:  chance of Earth impact 1 in 54,000 or  99.99814000% chance the asteroid will MISS the Earth
  • First Observed  on:  2015 08 13.34097
  • First Observed  By: Space Surveillance Telescope, Atom Site (MPC Code
    G45) (The Discovery M.P.E.C.:  MPEC 2015-P73 : 2015 PU228 )
  •  Last Observed: 2015 08 24.1170
  •  Data-Arc Span: 10.776
  •  Number Oppositions : 1
  •  Number of Observations Made:  88
  • Last Close-Approach:   Passed the Earth on 2015-Jul-29 at a Nominal Distance of  0.159680285899145 (AU), (62.143 Lunar Distance (LD)), or 14,843,209.88  miles (23,887,830.762 (KM))
Observing Run of 2015 PU228  on 2015-08-24 from Nerpio Spain
 On 2015-08-24 I was able to obtain 17 -- 60 Second Luminance BIN2 Images on itelescope.net's (TEL T7 0.43-m f/6.8 astrograph + CCD)  at AstroCamp Observatory. Nerpio, Spain  (MPC Code  I89)  and created 3 stacks of  5 images 
Astrometrica object verification window a stack (1of 3)  of  5- 60  Second Luminance BIN2 Images taken with itelescope.net's  (TEL T7 0.43-m f/6.8 astrograph + CCD)  at AstroCamp Observatory. Nerpio, Spain  (MPC Code  I89)
Astrometrica object verification window a stack (2 of 3)  of  5- 60  Second Luminance BIN2 Images taken with itelescope.net's  (TEL T7 0.43-m f/6.8 astrograph + CCD)  at AstroCamp Observatory. Nerpio, Spain  (MPC Code  I89)
Astrometrica object verification window a stack (3 of 3)  of  5- 60  Second Luminance BIN2 Images taken with itelescope.net's  (TEL T7 0.43-m f/6.8 astrograph + CCD) at AstroCamp Observatory. Nerpio, Spain  (MPC Code  I89)
The  Main-belt Asteroid  290465 (2005 TY169) 
While I was processing the FIts I spotted  the Main-belt Asteroid 290465 (2005 TY169)  in the  field of view.
Astrometrica object verification window a stack (1of 3)  of  5- 60  Second Luminance BIN2 Images taken with itelescope.net's  (TEL T7 0.43-m f/6.8 astrograph + CCD)  at AstroCamp Observatory. Nerpio, Spain  (MPC Code  I89)
Astrometrica object verification window a stack (2 of 3)  of  5- 60  Second Luminance BIN2 Images taken with itelescope.net's  (TEL T7 0.43-m f/6.8 astrograph + CCD)  at AstroCamp Observatory. Nerpio, Spain  (MPC Code  I89)
 
Astrometrica object verification window a stack (3 of 3)  of  5- 60  Second Luminance BIN2 Images taken with itelescope.net's  (TEL T7 0.43-m f/6.8 astrograph + CCD)  at AstroCamp Observatory. Nerpio, Spain  (MPC Code  I89)
Other links:

Aug 23, 2015

The Asteroid 2015 NK13 on 2015-08-22

 Background
(as of 2015-08-22)
  •  Object: 2015 NK13
  • Approximate Diameter: 200 m - 450 m (656.168 feet to 1476.378 feet) ( Absolute Magnitude:  H= 20.6 )
  •  Orbit Type:  Apollo [ PHA] 
  •  On the Sentry Risk Table:  Yeas  NOTE this  is NOT a prediction of an  impact  but rather a statement there is insufficient observational data rule out  an impact -- for infomation read  Understanding Risk Pages by Jon Giorgini
  • On the NEODyS CLOMON2 risk page: Yes
  • First Observed  on: 2015 07 08.54226221
  • First Observed  By: Pan-STARRS 1 (MPC Code F51) ,   (The Discovery M.P.E.C.: MPEC 2015-N44 : 2015 NK13)
  •  Last Observed: 2015 08 22.25954
  •  Data-Arc Span: 45
  •  Number Oppositions : 1
  •  Number of Observations Made:  178
  • Next Close-Approach:  Will safely pass Earth on  2015-Sep-15 at  Nominal Distance of  0.100071028718305 AU ( 38.945 (LD)) or 9,302,183.259 miles or (14,970,412.814 KM)

Observing Run of 2015 NK13  on 2015-08-22 from Nerpio Spain
On 2015-08-22  I  ran a series of 45 -- 60 Second Luminance BIN2 Images on itelescope.net's  (TEL T18 0.32-m f/8.0 astrograph + CCD)  at AstroCamp Observatory. Nerpio, Spain  (MPC Code  I89)  and created 4 stacks of  10 images ( in one the stacks had star where 2015 NK13 should be and was not use)
Astrometrica object verification window a stack (1of 4)  of 10- 60  Second Luminance BIN2 Images taken with itelescope.net's  (TEL T18 0.32-m f/8.0 astrograph + CCD)  at AstroCamp Observatory. Nerpio, Spain  (MPC Code  I89)
 
Astrometrica object verification window a stack (2 of 4)  of 10- 60  Second Luminance BIN2 Images taken with itelescope.net's  (TEL T18 0.32-m f/8.0 astrograph + CCD)  at AstroCamp Observatory. Nerpio, Spain  (MPC Code  I89)
Astrometrica object verification window a stack (4 of 4)  of 10- 60  Second Luminance BIN2 Images taken with itelescope.net's  (TEL T18 0.32-m f/8.0 astrograph + CCD)  at AstroCamp Observatory. Nerpio, Spain  (MPC Code  I89)
 Observing Run of 2015 NK13  on 2015-08-22 from Mayhill, New Mexico
 On 2015-08-22 I was able to obtain 39-60 Second Luminance BIN2 Images on itelescope.net's (TEL T11 0.50-m f/6.8 astrograph + CCD + f/4.5 focal reducer) at Mayhill, New Mexico (New Mexico Skies) - MPC H06 and created 4 stacks of 9  images.

Astrometrica object verification window a stack (1 of  4)  of 9- 60  Second Luminance BIN2 Images taken with itelescope.net's  (TEL T11 0.50-m f/6.8 astrograph + CCD + f/4.5 focal reducer) at Mayhill, New Mexico (New Mexico Skies) - MPC H06
Astrometrica object verification window a stack (2 of 4)  of 9- 60  Second Luminance BIN2 Images taken with itelescope.net's  (TEL T11 0.50-m f/6.8 astrograph + CCD + f/4.5 focal reducer) at Mayhill, New Mexico (New Mexico Skies) - MPC H06
Astrometrica object verification window a stack (3 of 4)  of 9- 60  Second Luminance BIN2 Images taken with itelescope.net's  (TEL T11 0.50-m f/6.8 astrograph + CCD + f/4.5 focal reducer) at Mayhill, New Mexico (New Mexico Skies) - MPC H06
 
Astrometrica object verification window a stack (4 of 4)  of 9- 60  Second Luminance BIN2 Images taken with itelescope.net's  (TEL T11 0.50-m f/6.8 astrograph + CCD + f/4.5 focal reducer) at Mayhill, New Mexico (New Mexico Skies) - MPC H06
Other links:

Feb 14, 2015

The Asteroid 2015 AZ43 On 2015-02-14 From Mayhill, New Mexico (New Mexico Skies) - MPC H06

The Near-Earth Object(Orbit type: Apollo ) 2015 AZ43 was first observed by Pan-STARRS 1 on 2015-01-11 and has been listed as a Virtual Impactor by SENTRY (JPL). 2015 AZ43 has a VERY SMALL impact risk(0.012%) for the date 2107-02-27.19. With more observations this risk could be rule out. In an effort to help improve the orbit I ran a imaging run from Mayhill, New Mexico (New Mexico Skies) - MPC H06 using itelescope.net's(TEL  T21 0.43-m f/6.8 astrograph + CCD + f/4.5 focal reducer) on 2015-02-14.

A Stack of 20-10 Second Luminance BIN2
Taken with Itelescope.net's
(TEL  T21 0.43-m f/6.8 astrograph + CCD + f/4.5 focal reducer)
Mayhill, New Mexico (New Mexico Skies) - MPC H06
A Stack of 20-10 Second Luminance BIN2
Taken with Itelescope.net's
(TEL  T21 0.43-m f/6.8 astrograph + CCD + f/4.5 focal reducer)
Mayhill, New Mexico (New Mexico Skies) - MPC H06
A Stack of 20-10 Second Luminance BIN2
Taken with Itelescope.net's
(TEL  T21 0.43-m f/6.8 astrograph + CCD + f/4.5 focal reducer)
Mayhill, New Mexico (New Mexico Skies) - MPC H06
Useful links:  
Understanding Risk Pages by Jon Giorgini
 Palermo Scale   
Torino Scale   
The Tracking News   
NEODyS CLOMON2 risk page 
List of removed objects(JPL) 

Note:  At 2015-02-23 22:01 UTC  --  2015 AZ43  was removed from the JPL Sentry Risk list.

 

Feb 13, 2015

The Asteroid 2015 AZ43 On 2015-02-13 from Auberry California USA - MPC U69

The Near-Earth Object(Orbit type: Apollo ) 2015 AZ43 was first observed by Pan-STARRS 1 on 2015-01-11 and has been listed as a Virtual Impactor by SENTRY (JPL). 2015 AZ43 has a VERY SMALL impact risk(0.012%) for the date 2107-02-27.19. With more observations this risk could be rule out. In an effort to help improve the orbit I ran a imaging run from Auberry California USA - MPC U69 using itelescope.net's (TEL T24 0.61-m f/6.5 astrograph + CCD) on 2015-02-13.

A Stack of 5-10 Second Luminance BIN2
Taken with Itelescope.net's
(TEL T24 0.61-m f/6.5 astrograph + CCD)
Auberry California USA - MPC U69
A Stack of 5-10 Second Luminance BIN2
Taken with Itelescope.net's
(TEL T24 0.61-m f/6.5 astrograph + CCD)
Auberry California USA - MPC U69
A Stack of 5-10 Second Luminance BIN2
Taken with Itelescope.net's
(TEL T24 0.61-m f/6.5 astrograph + CCD)
Auberry California USA - MPC U69
Useful links:
Understanding Risk Pages by Jon Giorgini
Palermo Scale 
Torino Scale  
The Tracking News   
NEODyS CLOMON2 risk page
 List of removed objects(JPL) 

Note:  At 2015-02-23 22:01 UTC  --  2015 AZ43  was removed from the JPL Sentry Risk list.