Contents  on 14 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 14 January '12

Two objects reported inside ten LD

There are two objects reported to be inside ten lunar distances (LD) of Earth today. 2012 AQ10 enters Earth's Hill sphere and radar target 2011 YH40 travels from 7.78 to 6.45 LD. Next up, radar target 2011 CP4 arrives inside ten LD on February 22nd.

This report was updated at 2352 UTC with new discovery 2012 AW10 (MPEC 2012-A58, calculated with some uncertainty to have departed ten LD yesterday) and, earlier, follow-up in today's DOU MPEC for 2012 AP10 and 2011 YH40. This report was previously updated at 0220 and 1933 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 and sky chart.

NEOCP Activity  on 14 January '12

The MPC's NEO Confirmation Page has 16 listings

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

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs  on 14 January '12

Minor Planet Electronic Circulars

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

MPEC 2012-A58 - "22:11 UT" - 2012 AW10

MPEC 2012-A57 - "12:03 UT" - 2012 AU10

MPEC 2012-A56 - "11:59 UT" - 2012 AT10

<< DOU on 14 Jan. '12 >>  MPEC 2012-A55 - "06:03 UT" - Daily Orbit Update

Observers  on 14 January '12

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 3 in MPEC 2012-A55 -- 2011 YH40, 32906, 10145
B75Betelgeuse Station in Italy, 1 in MPEC 2012-A55 -- 2011 YV15
160Castelmartini Obs. in Italy, 4 in MPEC 2012-A55 -- 2012 AE1, 2011 YH40, 2011 XE1, 2008 WZ13
703Catalina Sky Survey (CSS) in Arizona, 8 in MPECs 2012-A55 & 2012-A58 -- 2012 AW10, 2012 AC3, 99799, 311555, 29075, 262623, 142563, 6455
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPECs 2012-A55 & 2012-A57 -- 2012 AU10, 2012 AD3, 2009 CQ5, 2003 EO16, 2002 YB12
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 4 in MPEC 2012-A55 -- 2012 AY, 2012 AE1, 2011 XE1, 2003 AF23
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2012-A57 -- 2012 AU10
203GiaGa Obs. in Italy, 5 in MPEC 2012-A55 -- 2012 AY, 2012 AN10, 2012 AC3, 2003 AF23, 310442
J95Great Shefford Obs. in England, 5 in MPECs 2012-A55, 2012-A56, 2012-A57 & 2012-A58 -- 2012 AW10, 2012 AU10, 2012 AT10, 2012 AP10, 2011 YH40
704LINEAR in New Mexico, 3 in MPEC 2012-A55 -- 2008 WZ13, 32906, 24475
I36Los Campitos Obs. in Argentina, 2 in MPEC 2012-A55 -- 2011 YU62, 2011 SR69
697McGraw-Hill Telescope in Arizona, 1 in MPEC 2012-A57 -- 2012 AU10
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2012-A56 & 2012-A57 -- 2012 AU10, 2012 AT10
A24New Millennium Obs. in Italy, 29 in MPEC 2012-A55 -- 2012 AC3, 2011 YH40, 2011 YA, 2011 XO3, 2011 WV134, 2011 SL102, 2008 WZ13, 2004 YU5, 90147, 85839, 42286, 32906, 29075, 25916, 21088, 209924, 20826, 202435, 175706, 137805, 137084, 10145, 8567, 4183, 3691, 3200, 2368, 1943, 1620
J41Raheny Obs. in Ireland, 2 in MPEC 2012-A55 -- 2012 AN10, 2004 MD
204Schiaparelli Obs. in Italy, 1 in MPEC 2012-A57 -- 2012 AU10
645Sloan Digital Sky Survey (SDSS) in New Mexico, 10 in MPEC 2012-A55 -- 2004 RD84, 2001 UW17, 2001 RA18, 2000 JY8, 2000 HP40, 2000 CL33, 88264, 85804, 310402, 6178
291Spacewatch 1.8m telescope in Arizona, 11 in MPECs 2012-A55, 2012-A56, 2012-A57 & 2012-A58 -- 2012 AW10, 2012 AU10, 2012 AT10, 2012 AP10, 2012 AF3, 2011 YZ62, 2011 YE6, 2011 WK15, 2011 WD39, 2011 VQ5, 2011 SG5
G56Walnut Creek Obs. in northern California, 3 in MPEC 2012-A55 -- 2012 AE1, 2012 AC3, 2011 WV134
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 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 AS10JPL Sentry02172025-2110617.3e-08-3.46-4.300JPL: "Analysis based on 37 observations spanning 2.7242 days (2012-Jan-11.22399 to 2012-Jan-13.94822)." Diameter approximately 1.100 km. from mean, weighted H=17.4.
2012 AP10JPL Sentry16462062-21111032.8e-04-4.52-5.400JPL: "Analysis based on 31 observations spanning 2.8656 days (2012-Jan-11.08359 to 2012-Jan-13.94917)." Diameter approximately 0.019 km. from mean, weighted H=26.2.

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 14 January '12

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

2352Updated Traffic Report
2214Grabbed MPEC 2012-A58 - 2012 AW10 - see above
1646Noted that JPL Sentry has updated its 2012 AP10 risk assessment - see above
Grabbed MPEC 2012-A55 - Daily Orbit Update - see above
Grabbed MPEC 2012-A56 - 2012 AT10 - see above
Grabbed MPEC 2012-A57 - 2012 AU10 - see above
0217Noted that JPL Sentry has posted 2012 AS10 as an impact risk - see above