2007 TU24 on 28 Jan. from radar 
from Arecibo with Green Bank.

On January 28th Arecibo bounced signals off of 2007 TU24 to be received at Green Bank to obtain this image when the asteroid was coming inside of three lunar distances of Earth and closer. Further observation from Arecibo is planned during 1-4 February. See A/CC's 2007 TU24 links for more info. Credit: NASA.


Contents  on 31 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 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.

Radar Astrometry  on 31 January '08

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added the following small-body radar observing work:


Data addition noted at 1531 UTC when the database was dated 31 Jan.

NEOCP Activity  on 31 January '08

The MPC's NEO Confirmation Page has 2 listings: 2 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had two updated listings. Both of these were "one nighters." So far The Tracking News has counted a total of four objects listed on the NEOCP at some point today.

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 31 January '08

Minor Planet Electronic Circulars

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


MPEC 2008-B71 - "13:44 UT" - 2008 BQ16


MPEC 2008-B70 - "13:41 UT" - 2008 BP16


MPEC 2008-B69 - "13:39 UT" - 2008 BO16


MPEC 2008-B68 - "13:36 UT" - 2008 BN16


<< DOU on 31 Jan. '08 >>  MPEC 2008-B67 - "07:08 UT" - Daily Orbit Update

Observers  on 31 January '08

A total of 20 observing facilities appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2007 TU24
H55Astronomical Research Obs. (ARO) in Illinois, 3 in MPEC 2008-B67 -- 2008 BX2, 2008 BV2, 2007 YV56
J51Atlante Obs. in the Canary Islands, 3 in MPEC 2008-B67 -- 2008 AF4, 2007 TU24, 4450
A81Balzaretto Obs. in Italy, 1 in MPEC 2008-B67 -- 2007 TU24
703Catalina Sky Survey (CSS) in Arizona, 10 in MPEC 2008-B67 -- 2008 AE, 2007 YK, 2005 TU45, 66959, 22099, 173561, 172722, 170903, 163902, 163696
448Desert Moon Obs. in New Mexico, 9 in MPEC 2008-B67 -- 2008 AT28, 2008 AN33, 2007 YK, 2007 YB2, 2007 TU24, 173232, 162510, 162173, 140288
256Green Bank in West Virginia, 1 in radar -- 2007 TU24
A35Hormersdorf Obs. in Germany, 1 in MPEC 2008-B67 -- 2007 TU24
J37Huelva Obs. in Spain, 2 in MPEC 2008-B67 -- 2007 TU24, 1685
B15Inastars Obs. in Germany, 1 in MPEC 2008-B67 -- 2007 TU24
704LINEAR in New Mexico, 11 in MPEC 2008-B67 -- 2008 BE15, 2008 AE, 2007 YK, 2007 TU24, 2005 TU45, 2003 BH84, 66959, 33342, 172722, 163696, 4954
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2008-B67, 2008-B68, 2008-B69, 2008-B70 & 2008-B71 -- 2008 BQ16, 2008 BP16, 2008 BO16, 2008 BN16, 2003 EE16
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 14 in MPEC 2008-B67 -- 2008 AF4, 2008 AE, 2007 YK, 2007 YB2, 2007 VQ4, 2007 TU24, 2007 TG8, 2005 EK70, 2003 BT35, 22099, 172722, 11398, 4450, 3691
649Powell Obs. in Kansas, 1 in MPEC 2008-B67 -- 2008 BX2
E12Siding Spring Survey in New South Wales, 1 in MPEC 2008-B67 -- 2008 BC15
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2008-B67 -- 138258, 13651
291Spacewatch 1.8m telescope in Arizona, 15 in MPECs 2008-B67, 2008-B68, 2008-B69, 2008-B70 & 2008-B71 -- 2008 BV2, 2008 BS2, 2008 BQ16, 2008 BP16, 2008 BO16, 2008 BN16, 2008 AT28, 2008 AL33, 2007 YT56, 2005 XE1, 2005 GK, 2004 CR2, 2003 BM47, 2002 XM90, 2000 DP107
611Starkenburg Obs. in Germany, 1 in MPEC 2008-B67 -- 2007 TU24
H53Thompsonville Obs. in Illinois, 6 in MPEC 2008-B67 -- 1989 AZ, 99935, 86324, 85804, 170891, 153591
247roving observer, 1 in MPEC 2008-B67 -- 2007 TU24

Impact Risk Monitoring  on 31 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 and our ephemerides page for a list of objects under current observation.
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 BO16JPL Sentry16282021-2107694.9e-07-4.87-5.650JPL: "Analysis based on 11 observations spanning .92247 days (2008-Jan-30.38083 to 2008-Jan-31.3033)." Diameter approximately 0.098 km. from mean, weighted H=22.7.
2008 BN16JPL Sentry17582029-2108421.5e-06-6.27-6.770JPL: "Analysis based on 15 observations spanning 1.0974 days (2008-Jan-30.24765 to 2008-Jan-31.34506)." Diameter approximately 0.022 km. from mean, weighted H=25.9.
2008 BE15NEODyS15312027-207453.41e-09-7.80-8.030NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2008/01/30.384 to 2008/01/30.483."
JPL Sentry15302027-2098247.8e-08-6.86-7.280JPL: "Analysis based on 20 observations spanning .09912 days (2008-Jan-30.3833 to 2008-Jan-30.48242)." Diameter approximately 0.041 km. from mean, weighted H=24.6.
2008 BD15JPL Sentry23342008-21072336.6e-07-2.91-2.960JPL: "Analysis based on 15 observations spanning .12929 days (2008-Jan-30.31301 to 2008-Jan-30.4423)." Diameter approximately 0.250 km. from mean, weighted H=20.7.
2008 BC15NEODyS1531207211.03e-06-6.64-6.640NEODyS: "Based on 21 optical observations (of which 1 are rejected as outliers) from 2008/01/30.313 to 2008/01/30.725."
JPL Sentry15302072-209421.9e-06-6.42-6.610JPL: "Analysis based on 21 observations spanning .41244 days (2008-Jan-30.31193 to 2008-Jan-30.72437)." Diameter approximately 0.016 km. from mean, weighted H=26.7.
2008 AF4NEODyS15312079-2090123.83e-06-3.13-3.270NEODyS: "Based on 332 optical observations (of which 4 are rejected as outliers) from 2008/01/10.397 to 2008/01/31.016."
JPL Sentry15302088-2100251.7e-05-2.51-3.130JPL: "Analysis based on 328 observations spanning 20.618 days (2008-Jan-10.39652 to 2008-Jan-31.01493)." Diameter approximately 0.379 km. from mean, weighted H=19.8.
2007 YV56JPL Sentry1530R E M O V E DJPL: Risk listing removed at 1109 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 31 January '08

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

2334Noted that JPL Sentry has posted 2008 BD15 as an impact risk - see above
1758Noted that JPL Sentry has posted 2008 BN16 as an impact risk - see above
1628Noted that JPL Sentry has posted 2008 BO16 as an impact risk - see above
1531Noted that NEODyS has updated its 2008 AF4 risk assessment - see above
Grabbed MPEC 2008-B67 - Daily Orbit Update - see above
Noted Radar Astrometry database addition
1530Noted that JPL Sentry has removed 2007 YV56 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 AF4 risk assessment - see above
Noted that JPL Sentry has updated its 2008 BC15 risk assessment - see above
Noted that NEODyS has posted 2008 BC15 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 BE15 risk assessment - see above
Noted that NEODyS has posted 2008 BE15 as an impact risk - see above
Grabbed MPEC 2008-B68 - 2008 BN16 - see above
Grabbed MPEC 2008-B69 - 2008 BO16 - see above
Grabbed MPEC 2008-B70 - 2008 BP16 - see above
Grabbed MPEC 2008-B71 - 2008 BQ16 - see above