4 Vesta's southern mountain peak from Dawn. 

Science@NASA has a news item, titled "Space Mountain Produces Terrestrial Meteorites," about one of the highest mountains in the Solar System, now being studied by NASA's Dawn Main Belt asteroid mission orbiting 4 Vesta. South is to the upper right in this image, perpendicular to circum-Vesta grooves seen at lower left. Credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA.

Contents  on 1 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 1 January '12

The MPC's NEO Confirmation Page has 30 listings

When last checked at 2200 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 30 objects listed. Of these, seven were "one nighters." So far The Tracking News has counted a total of 32 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 1 January '12

Minor Planet Electronic Circulars

As of last check at 2200 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2012-A02 - "15:16 UT" - 2011 WV134

<< DOU on 1 Jan. '12 >>  MPEC 2012-A01 - "06:04 UT" - Daily Orbit Update

Observers  on 1 January '12

A total of 27 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2012-A02 -- 2011 WV134
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPECs 2012-A01 & 2012-A02 -- 2011 YW1, 2011 YC, 2011 XD1, 2011 WV134, 2011 UH21
300Bisei Spaceguard Center in Japan, 1 in MPEC 2012-A01 -- 2011 YZ28
703Catalina Sky Survey (CSS) in Arizona, 14 in MPECs 2012-A01 & 2012-A02 -- 2011 YJ28, 2011 YE6, 2011 WV134, 2011 WO41, 2011 FZ2, 2008 AF32, 85709, 30825, 294739, 262623, 163693, 142348, 138883, 11398
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2012-A01 -- 2000 CH59
448Desert Moon Obs. in New Mexico, 12 in MPEC 2012-A01 -- 2011 YV15, 2011 YJ28, 2011 YH6, 2011 YG28, 2011 YE6, 2007 MM13, 2002 RD27, 2002 CM1, 99799, 308127, 192642, 138524
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 4 in MPECs 2012-A01 & 2012-A02 -- 2011 YW15, 2011 YG6, 2011 WV134, 2006 MJ10
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-A02 -- 2011 WV134
355Hadano Obs. in Japan, 12 in MPEC 2012-A01 -- 2011 YW15, 2011 YW1, 2011 YV15, 2011 YG6, 2011 YA, 2011 XE1, 2011 SR69, 2011 SL102, 2011 RR12, 2008 WZ13, 2008 SX245, 20826
379Hamamatsu-Yuto Obs. in Japan, 6 in MPEC 2012-A01 -- 2011 SL102, 2001 YE4, 24475, 209924, 7358, 2201
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2012-A01 -- 153951
695_program code "_" (29) via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2012-A01 -- 2011 XE1
704LINEAR in New Mexico, 6 in MPEC 2012-A01 -- 2011 YL28, 2011 YE29, 142348, 141018, 137925, 6050
I36Los Campitos Obs. in Argentina, 1 in MPEC 2012-A02 -- 2011 WV134
900Moriyama Obs. in Japan, 1 in MPEC 2012-A02 -- 2011 WV134
474Mt. John Obs. in New Zealand, 6 in MPEC 2012-A01 -- 2011 YX15, 2011 YJ6, 2011 YE29, 2011 XS2, 2011 XM1, 2011 XE
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPEC 2012-A01 -- 2011 UU158, 2011 OL51, 2008 AN33, 2005 NP1, 99799, 52768, 30825, 9172, 3671
C39Nijmegen Obs., 3 in MPEC 2012-A01 -- 2008 WZ13, 25916, 175706
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2012-A02 -- 2011 WV134
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-A02 -- 2011 WV134
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2012-A01 -- 2011 SR69
461SZTE Asteroid Program in Hungary, 1 in MPEC 2012-A01 -- 4183
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2012-A02 -- 2011 WV134
E12Siding Spring Survey (SSS) in New South Wales, 4 in MPEC 2012-A01 -- 2011 XS2, 2011 XE, 205378, 15817
691Spacewatch 0.9m telescope in Arizona, 7 in MPEC 2012-A01 -- 2011 YQ10, 2008 BS2, 285571, 175114, 159495, 3671, 2368
291Spacewatch 1.8m telescope in Arizona, 13 in MPEC 2012-A01 -- 2011 YW10, 2011 YQ10, 2011 YP10, 2011 YJ28, 2011 XZ1, 2011 XM1, 2011 XF, 2011 XD, 2011 WU95, 2011 WQ46, 2011 WL2, 2011 WE32, 2010 FQ
718Wiggins Obs. in Utah, 1 in MPEC 2012-A02 -- 2011 WV134
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 January '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2200 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 YC40NEODyS16202028-2050114.85e-06-7.15-7.210NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2011-12-29.272 to 2011-12-30.322."
2011 YJ28JPL Sentry1801R E M O V E DJPL: Risk listing removed at 1652 UTC.
2011 YW10JPL Sentry18012025-210962.7e-07-6.06-6.170JPL: "Analysis based on 30 observations spanning 6.8998 days (2011-Dec-25.21483 to 2012-Jan-01.11465)." Diameter approximately 0.054 km. from mean, weighted H=24.0.
NEODyS16202025-207583.55e-08-6.51-6.840NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2011-12-25.216 to 2012-01-01.115."
2011 WL2JPL Sentry18012098-211025.4e-07-4.47-4.540JPL: "Analysis based on 182 observations spanning 45.881 days (2011-Nov-16.31883 to 2012-Jan-01.1998)." 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 1 January '12

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

1801Noted that JPL Sentry has updated its 2011 WL2 risk assessment - see above
Noted that JPL Sentry has removed 2011 YJ28 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 YW10 risk assessment - see above
1620Noted that NEODyS has posted 2011 YC40 as an impact risk - see above
Noted that NEODyS has updated its 2011 YW10 risk assessment - see above
Grabbed MPEC 2012-A01 - Daily Orbit Update - see above
Grabbed MPEC 2012-A02 - 2011 WV134 - see above