Possible locations of 2007 WD5 relative to Mars on 30 Jan. 
2008. This NASA/JPL illustration is from Dec. 21st.

On January 2nd (Pacific Time) the NASA/JPL NEO Program Office reported that Magdalena Ridge "observations for asteroid 2007 WD5 taken on December 29 through January 2 have been used to improve the accuracy of the asteroid's orbit ... causing the Mars impact probability to decrease slightly to 3.6% (about one chance in 28)." See the DOU MPECs for January 1st and today plus earlier news links here and here. This NASA/JPL illustration of positional possibilities is from Dec. 21st.


Contents  on 3 January '08

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 this year 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 3 January '08

The MPC's NEO Confirmation Page has 4 listings: 1 new, 3 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new and three updated listings. Of these, two were "one nighters."

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

New MPECs  on 3 January '08

Minor Planet Electronic Circulars

As of last check at 2354 UTC, there have been two MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2008-A21 - "19:59 UT" - Comet 8P/TUTTLE


<< DOU on 3 Jan. '08 >>  MPEC 2008-A20 - "07:08 UT" - Daily Orbit Update

Observers  on 3 January '08

A total of 36 observing facilities appear in today's MPECs.

CodeObserver / observatory
A50Andrushivka Obs. in the Ukraine, 1 in MPEC 2008-A20 -- 2008 AD
J51Atlante Obs. in the Canary Islands, 3 in MPECs 2008-A20 & 2008-A21 -- 2007 YZ, 1862, 8P
235CAST Obs. in Italy, 1 in MPEC 2008-A21 -- 8P
B20Carmelita Obs. in Spain, 1 in MPEC 2008-A21 -- 8P
703Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2008-A20 -- 2005 WK4, 2003 BH84
A77Chante-Perdrix Obs. in France, 1 in MPEC 2008-A21 -- 8P
448Desert Moon Obs. in New Mexico, 1 in MPEC 2008-A21 -- 8P
372Geisei Obs. in Japan, 1 in MPEC 2008-A21 -- 8P
143Gnosca Obs. in Switzerland, 1 in MPEC 2008-A20 -- 2007 YS56
J95Great Shefford Obs. in England, 1 in MPEC 2008-A21 -- 8P
B34Green Island Obs. in Cyprus, 1 in MPEC 2008-A21 -- 8P
H51Greiner Research Obs. in Wisconsin, 9 in MPECs 2008-A20 & 2008-A21 -- 2008 AD, 2007 YZ, 2007 YV29, 2007 XH16, 2007 VQ4, 2005 XD1, 2005 WJ56, 2005 TU45, 8P
379Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2008-A20 -- 2007 YZ, 170891
D88Hiratsuka Obs., 1 in MPEC 2008-A21 -- 8P
J76La Murta Obs. in Spain, 1 in MPEC 2008-A21 -- 8P
J38La Vara Obs. in Spain, 1 in MPEC 2008-A21 -- 8P
D35Lulin Minor Bodies Tracking in Taiwan, 1 in MPEC 2008-A20 -- 2007 YF1
130Lumezzane Obs. in Italy, 1 in MPEC 2008-A21 -- 8P
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2008-A20 -- 2007 WD5
J40Malaga Obs. in Spain, 1 in MPEC 2008-A21 -- 8P
A06Mataro Obs. in Spain, 1 in MPEC 2008-A21 -- 8P
J46Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2008-A21 -- 8P
213Montcabre Obs. in Spain, 1 in MPEC 2008-A21 -- 8P
945Monte Deva Obs. in Spain, 1 in MPEC 2008-A21 -- 8P
J47Nazaret Obs. in Spain, 1 in MPEC 2008-A21 -- 8P
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 14 in MPECs 2008-A20 & 2008-A21 -- 2007 YK, 2007 VQ4, 2007 PU11, 2005 XK8, 2005 XD1, 2005 WJ56, 2005 TU45, 2003 BH84, 2000 CH59, 96189, 66407, 154347, 153591, 8P
473Remanzacco Obs. in Italy, 1 in MPEC 2008-A21 -- 8P
619Sabadell Obs. in Spain, 1 in MPEC 2008-A21 -- 8P
233San Vito Obs. in Italy, 1 in MPEC 2008-A21 -- 8P
J49Santa Pola Obs. in Spain, 1 in MPEC 2008-A21 -- 8P
E12Siding Spring Survey (SSS) in New South Wales, 5 in MPEC 2008-A20 -- 2007 VY7, 2007 VT6, 2006 US216, 2006 AD, 2004 XY60
691Spacewatch 0.9m telescope in Arizona, 5 in MPEC 2008-A20 -- 2006 BG, 25916, 144411, 9172, 7839
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2008-A20 -- 2007 YS56
147Suno Obs. in Italy, 1 in MPEC 2008-A21 -- 8P
H83Timberlake Obs. in Virginia, 1 in MPEC 2008-A20 -- 2003 BH84
B42Vitebsk Obs. in Belarus, 1 in MPEC 2008-A21 -- 8P

Impact Risk Monitoring  on 3 January '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2354 UTC)
See the CRT page for a list of all objects rated recently as risks.
Note that the time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON (backup) 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
2008 AENEODyS14182016-2087272.1e-08-4.77-5.010NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2008/01/01.432 to 2008/01/02.121."
2007 YV56NEODyS1418208911.61e-08-5.82-5.820NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2007/12/31.516 to 2008/01/02.230."
2007 YS56JPL Sentry14182084-209533.2e-08-8.08-8.090JPL: "Analysis based on 25 observations spanning 2.8730 days (2007-Dec-31.24562 to 2008-Jan-03.11859)." Diameter approximately 0.025 km. from mean, weighted H=25.6.
2007 YQ56NEODyS14182020-2089535.58e-07-3.50-4.430NEODyS: "Based on 42 optical observations (of which 0 are rejected as outliers) from 2007/12/31.146 to 2008/01/01.730."
JPL Sentry03382020-21072131.0e-06-3.31-4.320JPL: "Analysis based on 42 observations spanning 1.5837 days (2007-Dec-31.14551 to 2008-Jan-01.72926)." Diameter approximately 0.365 km. from mean, weighted H=19.8.
2007 YG1JPL Sentry0029R E M O V E DJPL: Risk listing removed at 0004 UTC.

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 3 January '08

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

2015Grabbed MPEC 2008-A21 - Comet 8P/TUTTLE - see above
1418Noted that NEODyS has posted 2007 YQ56 as an impact risk - see above
Noted that JPL Sentry has updated its 2007 YS56 risk assessment - see above
Noted that NEODyS has posted 2007 YV56 as an impact risk - see above
Noted that NEODyS has posted 2008 AE as an impact risk - see above
Grabbed MPEC 2008-A20 - Daily Orbit Update - see above
0338Noted that JPL Sentry has posted 2007 YQ56 as an impact risk - see above
0029Noted that JPL Sentry has removed 2007 YG1 as an impact risk - see above