Contents  on 2 January '12

Resources:

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 2 January '12

The MPC's NEO Confirmation Page has 45 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 45 objects listed. Of these, fifteen were "one nighters."

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 2 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 2 Jan. '12 >>  MPEC 2012-A03 - "06:03 UT" - Daily Orbit Update

Observers  on 2 January '12

Seventeen observers appear in today's MPEC.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 3 in MPEC 2012-A03 -- 2011 YA, 2011 SL102, 1620
E23Arcadia Obs. in New South Wales, 1 in MPEC 2012-A03 -- 2011 WV134
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPEC 2012-A03 -- 2011 YX15, 2011 YV15, 2011 YJ28, 2011 YH40, 2011 YG28, 2011 YE40, 2011 YD29, 2011 YB40, 2011 YB29, 2011 WL2, 2011 WA96, 2011 US63, 2011 QF14
B66Casasco Obs. in Italy, 1 in MPEC 2012-A03 -- 2003 AK18
703Catalina Sky Survey (CSS) in Arizona, 8 in MPEC 2012-A03 -- 2003 BL1, 96315, 90403, 53110, 42286, 32906, 283460, 267494
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPEC 2012-A03 -- 2011 YX15, 2011 YE40, 2011 YE29
C81Dolomites Obs. in Italy, 1 in MPEC 2012-A03 -- 2011 YG28
695_program code "_" (29) via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2012-A03 -- 2011 XE1
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPEC 2012-A03 -- 2011 YH6, 2011 WV134, 2011 WC39, 2007 CF19, 2003 BK47, 137158, 136793, 5587
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2012-A03 -- 2007 CF19
233San Vito Obs. in Italy, 3 in MPEC 2012-A03 -- 2001 YE4, 24475, 209924
204Schiaparelli Obs. in Italy, 6 in MPEC 2012-A03 -- 2011 XA3, 2011 WL69, 2011 QD48, 2007 LE, 2004 XK50, 2002 AC
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-A03 -- 2011 XE
291Spacewatch 1.8m telescope in Arizona, 9 in MPEC 2012-A03 -- 2011 YW10, 2011 YJ28, 2011 YH28, 2011 XZ1, 2011 XM1, 2011 WQ46, 2011 WO41, 2011 WL2, 2010 FQ
A78Stia Obs. in Italy, 3 in MPEC 2012-A03 -- 2011 YG6, 2011 XE1, 2011 SL102
H47Vicksburg Obs. in Mississippi, 4 in MPEC 2012-A03 -- 53430, 21088, 3200, 2201
G56Walnut Creek Obs. in northern California, 1 in MPEC 2012-A03 -- 2011 YA
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2011 YH28JPL Sentry16002022-2083205.0e-07-3.44-3.600JPL: "Analysis based on 22 observations spanning 4.9717 days (2011-Dec-27.41812 to 2012-Jan-01.38981)." Diameter approximately 0.301 km. from mean, weighted H=20.3.
NEODyS16002022-2084234.16e-07-3.50-3.660NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2011-12-27.419 to 2012-01-01.391."
2011 YW10JPL Sentry18052025-206025.6e-09-7.15-7.160JPL #2 for the day: "Analysis based on 35 observations spanning 7.9604 days (2011-Dec-25.21483 to 2012-Jan-02.17524)." Diameter approximately 0.054 km. from mean, weighted H=24.0.
NEODyS16002025-205542.59e-08-6.49-6.490NEODyS: "Based on 33 optical observations (of which 1 are rejected as outliers) from 2011-12-25.216 to 2012-01-02.176."
2011 XC2JPL Sentry1732205615.3e-06-3.98-3.980JPL: "Analysis based on 31 observations spanning 22.188 days (2011-Dec-08.19806 to 2011-Dec-30.386484)." Diameter approximately 0.087 km. from mean, weighted H=22.9.
2011 WL2JPL Sentry16002098-211024.6e-07-4.53-4.530JPL: "Analysis based on 187 observations spanning 46.836 days (2011-Nov-16.31883 to 2012-Jan-02.15457)." Diameter approximately 0.240 km. from mean, weighted H=20.7.
NEODyS16002083-208311.99e-09-6.80-6.80NEODyS: "Based on 187 optical observations (of which 0 are rejected as outliers) from 2011-11-16.320 to 2012-01-02.155."
2011 UE305JPL Sentry1732210913.3e-09-6.84-6.840JPL: "Analysis based on 71 observations spanning 60.924 days (2011-Oct-30.46441 to 2011-Dec-30.38863)." Diameter approximately 0.190 km. from mean, weighted H=21.3.

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 2 January '12

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

1805Noted that JPL Sentry has updated its 2011 YW10 risk assessment - see above
1732Noted that JPL Sentry has updated its 2011 UE305 risk assessment - see above
Noted that JPL Sentry has updated its 2011 XC2 risk assessment - see above
1600Noted that JPL Sentry has updated its 2011 WL2 risk assessment - see above
Noted that NEODyS has reposted 2011 WL2 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 YH28 risk assessment - see above
Noted that NEODyS has updated its 2011 YH28 risk assessment - see above
Noted that JPL Sentry has updated its 2011 YW10 risk assessment - see above
Noted that NEODyS has updated its 2011 YW10 risk assessment - see above
Grabbed MPEC 2012-A03 - Daily Orbit Update - see above