Lagniappe Observing

Oct 2, 2015

The Recovery on 2nd Opposition of the Asteroid 2011 YS62 From 2015-09-26 To 2015-09-28

Observing Runs Looking for 2011 YS62 from 2015-08-26 to 2015-08-28

When it comes to target selection there two criteria I use first is would additional observations be useful, the second is the target in range of the telescope's capability. To find targets I check one or all of the lists (see below) and see if the target is range of the telescope's capability (if it is important I will push the limit of the range) Then I will plan an observing run. Recently I checked the Arecibo Asteroid Schedule and I saw they had requested optical astrometry for 2011 YS62. At the time this asteroid had a data-arc span of 89 days and had been unobserved for 1314 days (3.597 years)

First Night

I first did run of 15 - 120 Second Luminance BIN2 Images on itelescope.net's (TEL T27), with no luck,. Next I used Find_Orb to generate new orbital elements with Epoch 2015 Sep 26.0 and did a another run 15. I also used Find_Orb's Monte Carlo function to generate a lot of clones(virtual asteroids) orbital elements and then manually add them to Astrometrica's MPCOrb.dat file. Then I created 3 stacks of 5 images and found a moving object near the known object box of one of the clones. I assigned a temporary designation to the object and submitted night one's observations to the Minor Planet Center.

Astrometrica object verification window a stack (1 of 3 First Night ) a stacks 5 - 120 Second Luminance BIN2 Images on itelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD) at Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)

Astrometrica object verification window a stack (2 of 3 First Night ) a stacks 5 - 120 Second Luminance BIN2 Images on itelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD) at Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)

Second Night

Using Find_Orb I generated two orbits one was with just night one’s observations, the other with 2011 YS62 and night one's observations (“updated orbit”) and manually replaced the "clones" orbital elements. Next I ran a series of 6-120 Second Luminance BIN2 Images on itelescope.net's (TEL T27) and created a stacks of 5 images and found an object at the known object box for the "updated orbit". Then I ran a second run of 6 images and created a stack of 5 and saw that the object was moving. Later on I ran another run of 15 images and created a 3 more stacks of 5 images. I assigned a (new) temporary designation to the object and submitted the second night’s observations to the Minor Planet Center. Shortly thereafter the object was listed on the NEO Confirmation Page.

Astrometrica object verification window a stack (1 of 5 Second Night ) a stacks 5 - 120 Second Luminance BIN2 Images on itelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD) at Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)

Astrometrica object verification window a stack (2 of 5 Second Night ) a stacks 5- 120 Second Luminance BIN2 Images on itelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD) at Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)

Astrometrica object verification window a stack (3 of 5 Second Night ) a stacks 5- 120 Second Luminance BIN2 Images on itelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD) at Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)

Astrometrica object verification window a stack (4 of 5 Second Night ) a stacks 5- 120 Second Luminance BIN2 Images on itelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD) at Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)

Third Night

I did the same orbit update has I did the night before then, I obtain 32--120 Second Luminance BIN2 images with itelescope.net's (TEL T27) and created 3 stacks of 10 image and submitted the third night observations to the Minor Planet Center using the designation that was on the NEO Confirmation Page.

Astrometrica object verification window a stack (1 of 3 First Night ) a stacks 10 - 120 Second Luminance BIN2 Images on itelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD) at Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)

Astrometrica object verification window a stack (2 of 3 First Night ) a stacks 10 - 120 Second Luminance BIN2 Images on itelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD) at Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)

Astrometrica object verification window a stack (3 of 3 First Night ) a stacks 10 - 120 Second Luminance BIN2 Images on itelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD) at Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)

On 2015 Sept. 28 the Minor Planet Center issued MPEC 2015-S102: 2011 YS62 with the observations from the three nights of and updated orbital elements.

Background

(as of 2015-09-30)

Object: 2011 YS62
Approximate Diameter: 310 m - 680 m (1017.06 feet to 2230.97 feet) ( Absolute Magnitude: H= 19.7 )
Orbit Type: Amor
First Observed was made on: 2011 12 29.15398
First Observed By: Pan-STARRS 1 (MPC Code F51)
Assignment of asterisk: Catalina Sky Survey (MPC Code 703) For infomation on how discoverer is defined read MPEC 2010-U20 : EDITORIAL NOTICE
Last Observed: 2015 09 28.58389
Data-Arc Span: 1405 days (3.85 yr)
Number Oppositions :2
Number of Observations Made: 85
Next Close-Approach: Will safely pass Earth on 2015-Nov-2 at Nominal Distance of 0.0914513682160852 AU (35.59(LD)) or 8,500,935.758 miles or ( 13,680,929.957 KM)
On the Goldstone Asteroid Schedule: NO
On the Arecibo Asteroid Schedule: YES, Dates: 2015 Nov 29 (Request Optical Astrometry: No(It was request before recovery was made), Request Optical Lightcurve:NO, Request Optical Characterization NO)

Target lists

Sep 19, 2015

The Asteroid 2015 RS1 on 2015-09-13

The Asteroid 2015 RS1 (Orbit Type:Amor [NEO])
60 Second Luminance BIN2 Images 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
on 2015-09-13 From 03:22 to 04:11 (UTC)

(C) Steven M. Tilley Other

links:

Sep 8, 2015

Confirmation Images of the Asteroid 2015 RV1 on 2015-09-05

The Near-Earth Object 2015 RV1 (Orbit type: Amor ) was first observed at ISON-SSO Observatory, Siding Spring. (MPC code Q60) by L. Elenin. using a 0.4-m f/2.4 reflector + CCD. on 2015 09 04.44091. The asteroid has an approximate diameter 270 m to 750 m ( Absolute Magnitude: H= 19.722) The asteroid's Earth MOID (Minimum Orbit Intersection Distance) is 0.360167 AU (140.167 Lunar Distances). The last published Observations was made at: 2015 09 07.9515. At the time of this post 62 observations have been made.

Observing Run of 2015 RV1 on 2015-09-05 from Siding Spring, Australia

While 2015 RV1 was on the NEO Confirmation Page in an effort to help in the confirmation I was able to obtain 18--- 60 Second Luminance BIN2 Images on itelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD) , at Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62) and did did data reduction on four images.(working around stars)

Astrometrica object verification wind a (5 of 18) 60 Second Luminance BIN2 Images on iTelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD) at Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)
by Steven M. Tilley

Astrometrica object verification wind a (9 of 18) 60 Second Luminance BIN2 Images on iTelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD) at Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)
by Steven M. Tilley

Astrometrica object verification wind a (13 of 18) 60 Second Luminance BIN2 Images on iTelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD) at Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)
by Steven M. Tilley

Astrometrica object verification wind a (17 of 18) 60 Second Luminance BIN2 Images on iTelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD) at Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62)
by Steven M. Tilley

Incidentals

43298 (2000 GL67)

91472 (1999 RY91)

352195 (2007 RQ249)


Astrometrica object verification wind a (17 of 18) 60 Second Luminance BIN2 Images on iTelescope.net's (TEL T27 0.70-m f/6.6 CDK astrograph + CCD) at Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62) by Steven M. Tilley

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

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