Contents  on 8 January '12


The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection. - Note: A/CC has a main Web site and also a backup site with its own duplicate RSS news feed.

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.

NEOCP Activity  on 8 January '12

The MPC's NEO Confirmation Page has 9 listings

When last checked at 2300 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nine objects listed. Of these, five were "one nighters." So far The Tracking News has counted a total of ten 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 8 January '12

Minor Planet Electronic Circulars

As of last check at 2300 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2012-A40 - "15:16 UT" - 2011 EC7

<< DOU on 8 Jan. '12 >>  MPEC 2012-A39 - "06:03 UT" - Daily Orbit Update

Observers  on 8 January '12

Fourteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 28 in MPEC 2012-A39 -- 2012 AY, 2012 AE1, 2011 YW15, 2011 YW1, 2011 YV15, 2011 YT62, 2011 YS62, 2011 YM63, 2011 YH40, 2011 YG6, 2011 YA, 2011 XE1, 2011 XC2, 2011 SR69, 2011 SL102, 2011 FZ2, 2009 WR6, 2007 SP6, 2006 VY13, 2005 YS, 2005 XM4, 2005 UJ159, 2004 QB17, 2004 PX27, 2003 BL1, 2002 BF25, 2002 AX1, 2002 AN11
J51Atlante Obs. in the Canary Islands, 1 in MPEC 2012-A39 -- 2011 YA
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2012-A39 -- 2012 AB3, 2008 CN70
448Desert Moon Obs. in New Mexico, 7 in MPEC 2012-A39 -- 2011 YV15, 192642, 190491, 163899, 137799, 137671, 137064
J19El Maestrat Obs. in Spain, 2 in MPEC 2012-A39 -- 3352, 3103
203GiaGa Obs. in Italy, 4 in MPEC 2012-A39 -- 2012 AY, 2011 XE1, 262623, 175706
379Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2012-A39 -- 2011 YA, 1866
704LINEAR in New Mexico, 3 in MPEC 2012-A39 -- 2012 AE1, 2011 YA, 36284
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-A40 -- 2011 EC7
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2012-A39 -- 2001 YE4
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2012-A39 -- 2011 UU106
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPEC 2012-A39 -- 2003 TJ2, 162980, 153951, 143651, 142348, 3552, 1917
204Schiaparelli Obs. in Italy, 4 in MPEC 2012-A39 -- 2011 UE256, 2003 YJ, 2000 ED14, 2000 CE59
I40TRAPPIST in Chile, 1 in MPEC 2012-A39 -- 308635
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 January '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2300 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
2011 YH28JPL Sentry2300207911.6e-09-6.42-6.420JPL: "Analysis based on 43 observations spanning 9.8969 days (2011-Dec-27.41812 to 2012-Jan-06.31497)." Diameter approximately 0.310 km. from mean, weighted H=20.2.
2011 XC2JPL Sentry2300205614.9e-06-4.03-4.030JPL: "Analysis based on 33 observations spanning 22.188 days (2011-Dec-08.19806 to 2011-Dec-30.386484)." Diameter approximately 0.086 km. from mean, weighted H=23.0.
NEODyS17002056-208435.71e-06-3.96-3.960NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2011-12-08.199 to 2011-12-30.387."

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 8 January '12

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

2300Noted that JPL Sentry has updated its 2011 XC2 risk assessment - see above
Noted that JPL Sentry has updated its 2011 YH28 risk assessment - see above
2014Grabbed MPEC 2012-A39 - Daily Orbit Update - see above
Grabbed MPEC 2012-A40 - 2011 EC7 - see above
1700Noted that NEODyS has updated its 2011 XC2 risk assessment - see above