Contents  on 18 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 18 January '12

Two objects reported inside ten LD

Two asteroids are reported flying within ten lunar distances (LD) of Earth today. 2012 AQ10 exits Earth's Hill sphere and radar target 2011 YH40 is outbound from 5.96 to 7.10 LD. Radar target 2011 CP4 arrives inside ten LD on February 22nd.

This report was updated at 2235 UTC with follow-up for departed 2000 YA from radar as well as optical observations in today's DOU MPEC for 2012 AQ10 and 2011 YH40 plus departed 2012 AP10 and previous close passer 207398 2006 AS2. This report was updated earlier at 1819 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 18 January '12

Radar observation of two objects

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

Data update noted at 2029 UTC when the database was dated 18 Jan.

Data update noted at 2209 UTC when the database was dated 18 Jan.

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

NEOCP Activity  on 18 January '12

The MPC's NEO Confirmation Page has 21 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 21 objects listed. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 24 listings on the NEOCP today.

New MPECs  on 18 January '12

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 18 Jan. '12 >>  MPEC 2012-B06 - "06:03 UT" - Daily Orbit Update

Observers  on 18 January '12

Eighteen observers appear in today's MPEC.

CodeObserver / observatory
251Arecibo in Puerto Rico, 2 in radar -- 2000 YA, 170502
160Castelmartini Obs. in Italy, 6 in MPEC 2012-B06 -- 2012 AY, 2011 YH40, 2011 WV134, 2003 AF23, 1996 AE2, 310842
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPEC 2012-B06 -- 2012 AQ10, 2011 YU62, 2011 YH40
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2012-B06 -- 1627
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 6 in MPEC 2012-B06 -- 2012 AE1, 2012 AB11, 2012 AA11, 2011 YU62, 2011 YL6, 2011 XE1
J27El Guijo Obs. in Spain, 1 in MPEC 2012-B06 -- 29075
157Frasso Sabino Obs. in Italy, 2 in MPEC 2012-B06 -- 2012 AY, 2012 AE1
379Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2012-B06 -- 2011 SL102, 2008 WZ13, 209924
240Herrenberg Obs. in Germany, 2 in MPEC 2012-B06 -- 207398, 137052
695]Mark Trueblood via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPEC 2012-B06 -- 2012 AD3, 2011 YG6
704LINEAR in New Mexico, 10 in MPEC 2012-B06 -- 2011 YM63, 1996 AE2, 21088, 175706, 141018, 10145, 7358, 4183, 3103, 433
A13Naef Obs. in Switzerland, 1 in MPEC 2012-B06 -- 153951
A24New Millennium Obs. in Italy, 12 in MPEC 2012-B06 -- 2011 XO3, 90147, 42286, 24475, 209924, 20826, 137805, 137084, 4183, 3691, 3200, 1943
104San Marcello Pistoiese Obs. in Italy, 2 in MPEC 2012-B06 -- 2012 AP10, 1996 AE2
H36Sandlot Obs. in Kansas, 2 in MPEC 2012-B06 -- 2012 AP10, 2011 SE108
204Schiaparelli Obs. in Italy, 13 in MPEC 2012-B06 -- 2012 AC3, 2012 AB11, 2012 AA11, 2011 YS62, 2011 XC, 2011 WS2, 2008 QY, 2008 AF32, 2005 XM4, 2005 NJ1, 2004 QB17, 2004 PX27, 2002 BF25
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2012-B06 -- 2011 YM63, 2011 YE6, 2011 WV2, 2011 WL2, 2011 QP96, 2010 LN14
G56Walnut Creek Obs. in northern California, 4 in MPEC 2012-B06 -- 2012 AC3, 2012 AA11, 2011 YL6, 2011 WV134
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 January '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 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 AP10JPL Sentry17052069-2111841.1e-04-4.99-5.870JPL: "Analysis based on 50 observations spanning 7.0385 days (2012-Jan-11.08359 to 2012-Jan-18.122127)." Diameter approximately 0.019 km. from mean, weighted H=26.3.
NEODyS17052064-2089547.43e-05-5.08-5.680NEODyS: "Based on 50 optical observations (of which 2 are rejected as outliers) from 2012-01-11.084 to 2012-01-18.123."
2011 WL2JPL Sentry17052098-211026.4e-07-4.39-4.390JPL: "Analysis based on 195 observations spanning 62.827 days (2011-Nov-16.31883 to 2012-Jan-18.14564)." Diameter approximately 0.240 km. from mean, weighted H=20.7.

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 18 January '12

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

2235Updated Traffic Report
2209Noted Radar Astrometry database update - see above
2029Noted Radar Astrometry database update - see above
1705Noted that JPL Sentry has updated its 2011 WL2 risk assessment - see above
Noted 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-B06 - Daily Orbit Update - see above
0400Noted that the NEOCP has become active