Meteorite CR2 Grave Nunataks (GRA) 95229. 
(c)Copyright Arizona Board of Regents.

Lawrence Livermore Lab announced news yesterday about mixing in the Sun's protoplanetary disk based on surface layers found in a miniscule calcium-aluminum intrusion (CAI) from a piece of the Allende meteorite (see also a UC Berkeley report). And, in unrelated news from Arizona State University March 1st, researchers have found "large amounts of ammonia in a primitive Antarctic [meterorite]," CR2 Grave Nunataks (GRA) 95229 (image above, ©copyright Arizona Board of Regents). This is described as "very provocative" and may help explain the availability of nitrogen for prebiotic chemical reactions on the early Earth.


Contents  on 4 March '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 March '11

The MPC's NEO Confirmation Page has 6 listings: 2 new, 4 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two new and four updated listings. Of these, two were "one nighters." So far The Tracking News has counted a total of eight 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 March '11

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-E23 - "10:32 UT" - 2011 EC7


MPEC 2011-E22 - "10:27 UT" - 2011 EB7


<< DOU on 4 Mar. '11 >>  MPEC 2011-E21 - "07:07 UT" - Daily Orbit Update


MPEC 2011-E20 - "00:29 UT" - 2008 MB5

Observers  on 4 March '11

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
A50Andrushivka Obs. in the Ukraine, 1 in MPEC 2011-E21 -- 48603
H21Astronomical Research Obs. Westfield in Illinois, 26 in MPECs 2011-E20, 2011-E21 & 2011-E22 -- 2011 EW4, 2011 EJ, 2011 EH, 2011 EC, 2011 EB7, 2011 EB, 2011 DY4, 2011 DW, 2011 DV10, 2011 DU, 2011 DT9, 2011 DS9, 2011 DS, 2011 DD5, 2011 CH50, 2011 CH33, 2011 CG2, 2011 BR15, 2011 BJ24, 2011 BA12, 2011 AN16, 2011 AA37, 2010 VY190, 2010 TH19, 2010 SR3, 2008 MB5
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-E21 -- 2011 ET4
703Catalina Sky Survey in Arizona, 1 in MPEC 2011-E21 -- 2008 MB5
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2011-E21 -- 2011 EX4
A17Guidestar Obs. in Germany, 1 in MPEC 2011-E21 -- 2011 DD5
379Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2011-E21 -- 2011 CH71, 2009 FY4
240Herrenberg Obs. in Germany, 1 in MPEC 2011-E21 -- 1864
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2011-E21 -- 2011 CY6
695]Mark Trueblood via Kitt Peak Natl. Obs. (KPNO) in Arizona, 3 in MPEC 2011-E21 -- 2011 CY46, 2011 BO59, 2004 XN50
704LINEAR in New Mexico, 2 in MPEC 2011-E21 -- 68350, 243025
932McCarthy Obs. in Connecticut, 1 in MPEC 2011-E21 -- 2010 RO82
B67Mirasteilas Obs. in Switzerland, 6 in MPEC 2011-E21 -- 2011 DU, 2010 UX7, 2009 DV42, 2007 DU103, 2001 QP181, 2001 CA32
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2011-E21, 2011-E22 & 2011-E23 -- 2011 EC7, 2011 EB7, 175189
H23Pear Tree Obs. in Florida, 2 in MPEC 2011-E21 -- 2011 CH71, 2011 CG2
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 5 in MPEC 2011-E21 -- 2011 DW, 2011 AO52, 2002 TD60, 1999 TK12, 163250
586Pic du Midi Obs. in France, 3 in MPEC 2011-E21 -- 2011 EW4, 2011 AF37, 2010 RO82
H06|H. Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-E21 -- 2010 RF12
H36Sandlot Obs. in Kansas, 2 in MPECs 2011-E21 & 2011-E22 -- 2011 EJ, 2011 EB7
291Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2011-E21, 2011-E22 & 2011-E23 -- 2011 EC7, 2011 EB7, 2011 DU, 2011 DS9, 2011 CP4, 2011 CN2, 2011 BT15, 2011 BC40, 2011 BA45, 2000 EK26
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2011-E21 -- 2011 CY46
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 March '11

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 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 EW4JPL Sentry17232014-21103781.5e-06-4.43-4.810JPL: "Analysis based on 19 observations spanning .91066 days (2011-Mar-02.32289 to 2011-Mar-03.233554)." Diameter approximately 0.082 km. from mean, weighted H=23.1.
NEODyS17232014-20901365.57e-07-4.70-4.990NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2011-03-02.324 to 2011-03-03.234."
2011 EHJPL Sentry1723R E M O V E DJPL: Risk listing removed at 1246 UTC.
2011 ECJPL Sentry1723R E M O V E DJPL: Risk listing removed at 1451 UTC.
2011 EBJPL Sentry17232070-207732.8e-05-5.60-5.690JPL: "Analysis based on 21 observations spanning 1.9789 days (2011-Mar-01.38036 to 2011-Mar-03.359224)." Diameter approximately 0.014 km. from mean, weighted H=26.9.
NEODyS17232070-207732.69e-05-5.63-5.720NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2011-03-01.381 to 2011-03-03.360."
2011 DV10JPL Sentry1723209311.9e-07-6.74-6.740JPL: "Analysis based on 23 observations spanning 5.0100 days (2011-Feb-26.30148 to 2011-Mar-03.311496)." Diameter approximately 0.036 km. from mean, weighted H=24.9.
2011 DS9JPL Sentry17232027-2104285.0e-07-3.86-4.220JPL: "Analysis based on 73 observations spanning 5.5424 days (2011-Feb-25.92799 to 2011-Mar-03.47039)." Diameter approximately 0.314 km. from mean, weighted H=20.2.
NEODyS17232027-2088184.2e-07-3.87-4.180NEODyS: "Based on 73 optical observations (of which 0 are rejected as outliers) from 2011-02-25.929 to 2011-03-03.471."
2011 DSJPL Sentry17232067-2109171.6e-05-6.11-6.360JPL: "Analysis based on 54 observations spanning 7.8743 days (2011-Feb-23.39905 to 2011-Mar-03.273386)." Diameter approximately 0.013 km. from mean, weighted H=27.1.
NEODyS17232065-2087111.31e-05-6.18-6.360NEODyS: "Based on 54 optical observations (of which 0 are rejected as outliers) from 2011-02-23.400 to 2011-03-03.274."
2011 BT15JPL Sentry17232037-2110867.6e-05-2.89-3.470JPL: "Analysis based on 67 observations spanning 38.902 days (2011-Jan-24.28933 to 2011-Mar-04.19101)." Diameter approximately 0.150 km. from mean, weighted H=21.7.
NEODyS17232062-2090252.95e-05-3.25-3.690NEODyS: "Based on 68 optical observations (of which 3 are rejected as outliers) from 2011-01-24.290 to 2011-03-04.192."
2010 RF12JPL Sentry17232095-2110315.2e-02-3.33-3.330JPL: "Analysis based on 322 observations spanning 3.1100 days (2010-Sep-05.40477 to 2010-Sep-08.514787)." Diameter approximately 0.007 km. from mean, weighted H=28.4.
NEODyS17232095-210084.82e-02-3.36-3.360NEODyS: "Based on 324 optical observations (of which 3 are rejected as outliers) from 2010-09-05.406 to 2010-09-08.516."

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 March '11

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

1723Noted that JPL Sentry has updated its 2010 RF12 risk assessment - see above
Noted that NEODyS has updated its 2010 RF12 risk assessment - see above
Noted that JPL Sentry has updated its 2011 BT15 risk assessment - see above
Noted that NEODyS has updated its 2011 BT15 risk assessment - see above
Noted that JPL Sentry has updated its 2011 DS risk assessment - see above
Noted that NEODyS has updated its 2011 DS risk assessment - see above
Noted that JPL Sentry has updated its 2011 DS9 risk assessment - see above
Noted that NEODyS has updated its 2011 DS9 risk assessment - see above
Noted that JPL Sentry has updated its 2011 DV10 risk assessment - see above
Noted that JPL Sentry has updated its 2011 EB risk assessment - see above
Noted that NEODyS has updated its 2011 EB risk assessment - see above
Noted that JPL Sentry has removed 2011 EC as an impact risk - see above
Noted that JPL Sentry has removed 2011 EH as an impact risk - see above
Noted that JPL Sentry has updated its 2011 EW4 risk assessment - see above
Noted that NEODyS has updated its 2011 EW4 risk assessment - see above
Grabbed MPEC 2011-E21 - Daily Orbit Update - see above
Grabbed MPEC 2011-E22 - 2011 EB7 - see above
Grabbed MPEC 2011-E23 - 2011 EC7 - see above
0107Grabbed MPEC 2011-E20 - 2008 MB5 - see above