Contents  on 4 April '11

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 4 April '11

The MPC's NEO Confirmation Page has 13 listings: 2 new, 11 updated

When last checked at 2107 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two new and eleven updated listings. Of these, eleven were "one nighters." So far The Tracking News has counted a total of 27 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 4 April '11

Minor Planet Electronic Circulars

As of last check at 2107 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-G34 - "18:44 UT" - 2011 GV9


<< DOU on 4 Apr. '11 >>  MPEC 2011-G33 - "07:09 UT" - Daily Orbit Update


MPEC 2011-G32 - "06:35 UT" - 2011 GJ3


MPEC 2011-G31 - "02:53 UT" - 2011 GH3


MPEC 2011-G30 - "02:36 UT" - 2011 GG3


MPEC 2011-G29 - "02:31 UT" - 2011 GF3

Observers  on 4 April '11

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPEC 2011-G33 -- 2011 FB29, 2011 EM11
A81Balzaretto Obs. in Italy, 2 in MPEC 2011-G33 -- 2011 DS9, 2008 FU6
300Bisei Spaceguard Center in Japan, 2 in MPEC 2011-G33 -- 2011 GZ2, 2011 GB3
703Catalina Sky Survey in Arizona, 1 in MPEC 2011-G33 -- 141531
807$program code "$" (13) via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2011-G33 -- 2010 TK7
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPEC 2011-G33 -- 2011 GD, 2011 GC, 2011 FS29, 2011 FQ17, 2011 FB29, 2011 EW74, 2011 EW29
A77Chante-Perdrix Obs. in France, 1 in MPEC 2011-G33 -- 102873
J95Great Shefford Obs. in England, 4 in MPECs 2011-G29, 2011-G30, 2011-G31 & 2011-G33 -- 2011 GH3, 2011 GG3, 2011 GF3, 2011 GE3
046Klet Obs. in the Czech Republic, 6 in MPEC 2011-G33 -- 2011 EW29, 2011 DS9, 2011 CH71, 2011 AN16, 2008 SO, 85953
704LINEAR in New Mexico, 5 in MPEC 2011-G33 -- 2011 GD, 37336, 169675, 138359, 3122
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2011-G31 -- 2011 GH3
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPECs 2011-G29 & 2011-G30 -- 2011 GG3, 2011 GF3
I34Morgantown Obs., 3 in MPEC 2011-G33 -- 36284, 3554, 3122
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2011-G31, 2011-G32 & 2011-G34 -- 2011 GV9, 2011 GJ3, 2011 GH3
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2011-G29 & 2011-G30 -- 2011 GG3, 2011 GF3
J52Pinsoro Obs. in Spain, 2 in MPEC 2011-G33 -- 253841, 137052
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2011-G31, 2011-G32 & 2011-G33 -- 2011 GJ3, 2011 GH3, 2011 EU29
A78Stia Obs. in Italy, 2 in MPEC 2011-G33 -- 2011 DS9, 23183
H47Vicksburg Obs. in Mississippi, 1 in MPEC 2011-G33 -- 89958
C51WISE in Earth polar orbit, 1 in MPEC 2011-G33 -- 2010 DJ77
I15Wishing Star Obs. in Rhode Island, 4 in MPEC 2011-G33 -- 36284, 23187, 11885, 3554
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 April '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2107 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 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
2011 GJ3JPL Sentry15282017-21104351.5e-05-5.21-5.840JPL: "Analysis based on 13 observations spanning 1.9686 days (2011-Apr-02.28724 to 2011-Apr-04.25585)." Diameter approximately 0.020 km. from mean, weighted H=26.1.
NEODyS15282023-2080115.41e-08-7.91-8.110NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2011-04-02.288 to 2011-04-04.257."
2011 GH3NEODyS15282040-204011.6e-11-7.36-7.360NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2011-04-02.218 to 2011-04-04.084."
JPL Sentry05332042-211023.9e-10-6.22-6.290JPL: "Analysis based on 13 observations spanning 1.8657 days (2011-Apr-02.21718 to 2011-Apr-04.08286)." Diameter approximately 0.526 km. from mean, weighted H=19.0.
2011 GZ2JPL Sentry15282034-205468.5e-06-5.25-5.320JPL: "Analysis based on 20 observations spanning 1.4347 days (2011-Apr-02.22286 to 2011-Apr-03.65755)." Diameter approximately 0.020 km. from mean, weighted H=26.2.
NEODyS15282034-205438.7e-06-5.23-5.270NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2011-04-02.224 to 2011-04-03.658."
2011 EU29JPL Sentry1528211019.4e-09-5.63-5.630JPL: "Analysis based on 94 observations spanning 26.951 days (2011-Mar-08.20041 to 2011-Apr-04.15188)." Diameter approximately 0.370 km. from mean, weighted H=19.8.

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 4 April '11

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

1908Grabbed MPEC 2011-G34 - 2011 GV9 - see above
1528Noted that JPL Sentry has updated its 2011 EU29 risk assessment - see above
Noted that NEODyS has posted 2011 GH3 as an impact risk - see above
Noted that JPL Sentry has posted 2011 GJ3 as an impact risk - see above
Noted that NEODyS has posted 2011 GJ3 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 GZ2 risk assessment - see above
Noted that NEODyS has posted 2011 GZ2 as an impact risk - see above
Grabbed MPEC 2011-G32 - 2011 GJ3 - see above
Grabbed MPEC 2011-G33 - Daily Orbit Update - see above
0533Noted that JPL Sentry has posted 2011 GH3 as an impact risk - see above
0311Grabbed MPEC 2011-G31 - 2011 GH3 - see above
0241Grabbed MPEC 2011-G29 - 2011 GF3 - see above
Grabbed MPEC 2011-G30 - 2011 GG3 - see above