Contents  on 31 March '12

Asteroid/Comet Connection (A/CC) 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.

Traffic Report  on 31 March '12

Nine objects reported inside ten LD

Nine objects are reported traveling inside ten lunar distances (LD) of Earth today. Intruder 2012 EG5 (risk-listed radar target) enters the Earth-Moon system late in the day. Intruder 2012 FS35 exits Earth's Hill sphere, going from 3.42 to 4.18 LD. Further out, 2012 FT35 is headed away from 6.41 to 7.35 LD, 2012 FV23 from 6.69 to 7.03 LD, and 2012 FM35 from 8.78 to 9.45 LD. 2012 FH58 is inbound from 9.3 to 7.3 LD* and 2012 FW35 from 9.6 to 8.6 LD*. And risk-listed 2012 FA57 enters ten LD, passing from 10.14 to 8.11 LD while 2012 FX35 departs from inside ten LD, moving from 9.81 to 11.01 LD.

Approaching our neighborhood, 2012 FS52 arrives inside ten LD on April 1st and 2007 HV4 arrives inside ten LD on April 14th.

This report was posted at 1425 UTC with follow-up in today's DOU MPEC for 2012 FS52 and 2012 EG5.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Earth's Hill sphere (of gravitational influence) is estimated to extend out to around 3.89 LD. Object distances are interpreted by A/CC from JPL Horizons data. "LD*" indicates some passage uncertainty. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 31 March '12

The MPC's NEO Confirmation Page has 31 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 31 objects listed. Of these, eight were "one nighters." So far The Tracking News has counted a total of 32 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 31 March '12

Minor Planet Electronic Circulars

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

MPEC 2012-F114 - "16:22 UT" - 2010 VE

<< DOU on 31 Mar. '12 >>  MPEC 2012-F113 - "06:03 UT" - Daily Orbit Update

Observers  on 31 March '12

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPEC 2012-F113 -- 2012 FZ44, 2012 FZ23, 2012 FW23, 2012 FS23, 2012 FR35, 2012 FQ52, 2012 FP52, 2012 FO52, 2012 FO35, 2012 FK35, 2012 FH38, 2012 EA2, 2012 DF61
C77Bernezzo Obs. in Italy, 1 in MPEC 2012-F113 -- 2012 EG5
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2012-F113 -- 2012 FR35, 2012 FO35, 2010 OD101, 208565, 171819, 6053
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPECs 2012-F113 & 2012-F114 -- 2012 FZ44, 2012 FS52, 2012 FO52, 2012 EB2, 2012 DO8, 2011 US63, 2010 VE
A27Eridanus Obs. in Germany, 2 in MPEC 2012-F113 -- 2012 FZ23, 2012 DX75
J95Great Shefford Obs. in England, 1 in MPEC 2012-F113 -- 2012 EG5
168Kourovskaya Obs. in Russia, 12 in MPEC 2012-F113 -- 32906, 263976, 162186, 141018, 137925, 9400, 6455, 4183, 3103, 1866, 1627, 1620
704LINEAR in New Mexico, 5 in MPEC 2012-F113 -- 21277, 189008, 136618, 9400, 4055
J38La Vara Obs. in Spain, 1 in MPEC 2012-F113 -- 2012 EG5
A14Les Engarouines Obs. in France, 1 in MPEC 2012-F113 -- 5620
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-F113 -- 2011 AG5
C91Montevenere Obs., 2 in MPEC 2012-F113 -- 2012 EG5, 2012 AA11
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPEC 2012-F113 -- 2012 FQ52, 2011 YV15, 1998 HE3, 68063, 38086, 178601
A24New Millennium Obs. in Italy, 7 in MPEC 2012-F113 -- 2012 BC20, 1994 NK, 36183, 32906, 302830, 184990, 154144
J69North Obs. in England, 1 in MPEC 2012-F113 -- 2012 EG5
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPEC 2012-F113 -- 2009 AH16, 276049, 189973, 171819, 162038, 144411, 7341
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2012-F113 -- 2012 EG5
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2012-F113 -- 2012 EG5
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-F113 -- 5646
291Spacewatch 1.8m telescope in Arizona, 9 in MPEC 2012-F113 -- 2012 FZ23, 2012 FR52, 2012 FQ1, 2012 FN35, 2012 FB1, 2012 FA14, 2012 EH5, 2012 CL2, 2010 SO16
718Wiggins Obs. in Utah, 1 in MPEC 2012-F113 -- 2012 EG5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 March '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.





Notes for Today's Latest Risk Assessments
2012 EG5JPL Sentry1417210722.6e-07-6.63-6.850JPL: "Analysis based on 401 observations spanning 17.878 days (2012-Mar-13.30201 to 2012-Mar-31.17971)." Diameter approximately 0.047 km. from mean, weighted H=24.3.
2011 AG5NEODyS14172040-2051101.83e-03-1.06-1.061NEODyS: "Based on 210 optical observations (of which 0 are rejected as outliers) from 2010-11-08.631 to 2011-09-21.399."

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 March '12

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

1624Grabbed MPEC 2012-F114 - 2010 VE - see above
1425Posted Traffic Report
1417Noted that NEODyS has updated its 2011 AG5 risk assessment - see above
Noted that JPL Sentry has updated its 2012 EG5 risk assessment - see above
Grabbed MPEC 2012-F113 - Daily Orbit Update - see above