Contents  on 17 January '12


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Navigation tips: Use the << and >> arrows on the menus for each regular section (Observers, Risks, etc.) to move to the previous and next day's news for that section. Use the Index menu item to access specific days through a calendar interface. And use the all-up news archive to access news from any time since A/CC began in early 2002. To keep track of what's new each day, watch the Chronology section.

Traffic Report  on 17 January '12

Two objects reported inside ten LD

Two objects are reported to be within ten lunar distances (LD) of our planet today. Inside Earth's Hill sphere, 2012 AQ10 moves from 2.35 to 3.22 LD, and radar target 2011 YH40 is outbound from 5.39 to 5.96 LD.

On approach, radar target 2011 CP4 arrives inside ten LD on February 22nd.

This report was updated at 2028 UTC with observations reported from radar and today's DOU MPEC for 2011 YH40, and follow-up in today's DOU MPEC for departed 2012 AW10 and 2012 AP10. This report was previously updated at 1748 UTC.

Notes: Ten LD has no astronomical significance but is a useful reporting boundary. Earth's Hill sphere (of gravitational influence) has a radius estimated at about 3.89 LD. Distances are interpreted by A/CC from JPL Horizons data. See also today's timeline plus current additional details, sky chart, and ephemerides.

Radar Astrometry  on 17 January '12

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data update noted at 2005 UTC when the database was dated 17 Jan.

Photometry is needed for upcoming radar targets and also some astrometry. See Arecibo and Goldstone schedules.

NEOCP Activity  on 17 January '12

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty. There were nine listings noted earlier today.

New MPECs  on 17 January '12

Minor Planet Electronic Circulars

As of last check at 2317 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2012-B05 - "22:45 UT" - Comet C/2012 A2 (LINEAR)

MPEC 2012-B04 - "12:49 UT" - 2011 YH74

MPEC 2012-B03 - "12:17 UT" - 2012 AW12

<< DOU on 17 Jan. '12 >>  MPEC 2012-B02 - "06:03 UT" - Daily Orbit Update

Observers  on 17 January '12

A total of 26 observers appear in today's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 1 in MPEC 2012-B02 -- 209924
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPECs 2012-B02 & 2012-B05 -- 2012 AY, 2012 AW10, 2012 AU10, 2012 AE1, C/2012 A2, 2011 YV15, 2011 YM63, 2011 YH40, 2011 YG28, 2011 YB40, 2011 XE1, 2011 SL102
160Castelmartini Obs. in Italy, 13 in MPEC 2012-B02 -- 2012 AY, 2012 AE1, 2011 YV15, 2011 YH40, 2011 XE1, 2011 WV134, 2008 WZ13, 2003 AF23, 1996 AE2, 310842, 310442, 192642, 433
703Catalina Sky Survey in Arizona, 1 in MPEC 2012-B04 -- 2011 YH74
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPEC 2012-B02 -- 2009 XR2, 2005 JA22, 2003 BX33, 1999 LS7, 138847, 4055
106Crni Vrh Obs. in Slovenia, 3 in MPECs 2012-B02, 2012-B04 & 2012-B05 -- C/2012 A2, 2011 YH74, 2008 GE1
C81Dolomites Obs. in Italy, 1 in MPEC 2012-B05 -- C/2012 A2
151Eschenberg Obs. in Switzerland, 1 in MPEC 2012-B02 -- 2005 PO
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-B03 -- 2012 AW12
157Frasso Sabino Obs. in Italy, 5 in MPEC 2012-B02 -- 2012 AC3, 2012 AB11, 2012 AA11, 2011 YL6, 202435
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2011 YH40
J95Great Shefford Obs. in England, 4 in MPECs 2012-B02 & 2012-B05 -- 2012 AP10, 2012 AN10, C/2012 A2, 2011 YH40
A17Guidestar Obs. in Germany, 3 in MPEC 2012-B02 -- 2012 AW10, 2012 AC3, 2011 YM63
704LINEAR in New Mexico, 1 in MPEC 2012-B05 -- C/2012 A2
900Moriyama Obs. in Japan, 1 in MPEC 2012-B05 -- C/2012 A2
A24New Millennium Obs. in Italy, 15 in MPEC 2012-B02 -- 2011 XE1, 2011 SL102, 2008 WZ13, 2008 GE1, 85839, 32906, 29075, 289315, 25916, 21088, 175706, 10145, 8567, 2368, 1627
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2012-B02, 2012-B03 & 2012-B05 -- 2012 AW12, C/2012 A2, 21088, 2368
H23Pear Tree Obs. in Florida, 2 in MPEC 2012-B02 -- 2011 YH40, 2011 XE1
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-B05 -- C/2012 A2
204Schiaparelli Obs. in Italy, 1 in MPEC 2012-B05 -- C/2012 A2
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2012-B04 -- 2011 YH74
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2012-B05 -- C/2012 A2
A78Stia Obs. in Italy, 2 in MPEC 2012-B02 -- 2012 AC3, 10145
C38Varuna Obs. in Italy, 1 in MPEC 2012-B02 -- 2011 YH40
A48Verona Obs. in Italy, 3 in MPEC 2012-B02 -- 2012 AY, 2012 AE1, 2012 AB11
718Wiggins Obs. in Utah, 1 in MPEC 2012-B05 -- C/2012 A2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 January '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2317 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few special objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON2 risk pages.





Notes for Today's Latest Risk Assessments
2012 AP10NEODyS20062064-2089427.51e-05-5.05-5.610NEODyS #2 for the day: "Based on 70 optical observations (of which 0 are rejected as outliers) from 2012-01-11.084 to 2012-01-16.967."
JPL Sentry17002062-2111951.2e-04-4.93-5.820JPL: "Analysis based on 45 observations spanning 5.8823 days (2012-Jan-11.08359 to 2012-Jan-16.96592)." Diameter approximately 0.019 km. from mean, weighted H=26.3.

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale

An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from a variant orbit calculation that cannot be eliminated yet based on the existing data. Elimination can come quickly with just a little further observation or may take weeks or months, sometimes years. Once superceded or eliminated, a former impact solution has zero relevance to an object's risk. See Jon Giorgini's "Understanding Risk Pages" to learn more.

Chronology  on 17 January '12

Times are UTC for when items were noted or added by The Tracking News.

2317Grabbed MPEC 2012-B05 - Comet C/2012 A2 (LINEAR) - see above
Noted that the NEOCP has become empty
2028Updated Traffic Report
2006Noted that NEODyS has updated its 2012 AP10 risk assessment - see above
2005Noted Radar Astrometry database update - see above
1700Noted that JPL Sentry has updated its 2012 AP10 risk assessment - see above
Noted that NEODyS has updated its 2012 AP10 risk assessment - see above
Grabbed MPEC 2012-B02 - Daily Orbit Update - see above
Grabbed MPEC 2012-B03 - 2012 AW12 - see above
Grabbed MPEC 2012-B04 - 2011 YH74 - see above