Contents  on 20 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 20 March '12

Eight objects reported inside ten LD

Eight visitors are reported to be within ten lunar distances (LD) of our planet today. 2012 EO8 is inbound from 6.01 to 4.13 LD and risk-listed 2012 EK5 from 9.59 to 7.14 LD. Moving away, 2012 EL8 heads out from 7.8 to 8.0 LD*, 2012 EJ5 from 8.43 to 9.17 LD, and 2012 FM from 8.76 to 9.39 LD. Leaving the ten-LD "bubble," 2012 EN5 passes from 9.24 to 11.44 LD, risk-listed radar target 2012 DW60 from 9.62 to 10.84 LD, and 2012 FN from 9.7 to 10.2 LD*.

Approaching next, radar target intruder 2012 EG5 arrives inside ten LD on March 27th and returning 2007 HV4 on April 14th.

This report was updated at 1759 UTC with new distances info for the day and to note the recovery of 2012 EK5, expanding its observation arc from 21.487 hours to 6.5355 days. Also reported in today's DOU MPEC are 2012 FM, 2012 FG, 2012 EO8, and 2012 EG5. The first version of this report was posted at 1647 UTC.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. 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 20 March '12

The MPC's NEO Confirmation Page has 9 listings

When last checked at 2322 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nine objects listed. All of these were "one nighters." So far The Tracking News has counted a total of sixteen 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 20 March '12

Minor Planet Electronic Circulars

As of last check at 2322 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 20 Mar. '12 >>  MPEC 2012-F44 - "06:03 UT" - Daily Orbit Update

Observers  on 20 March '12

Thirteen observers appear in today's MPEC.

CodeObserver / observatory
300Bisei Spaceguard Center in Japan, 1 in MPEC 2012-F44 -- 2012 EG5
160Castelmartini Obs. in Italy, 5 in MPEC 2012-F44 -- 2012 EO8, 2012 CA55, 2012 AA11, 2011 XO3, 2011 WV134
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPEC 2012-F44 -- 2012 FJ, 2012 FG, 2012 EW14, 2012 ES14, 2012 EO10, 2012 EM8, 2012 EL5, 2012 EG5, 2011 US63
157Frasso Sabino Obs. in Italy, 3 in MPEC 2012-F44 -- 2012 EL5, 2012 DX75, 1994 NK
J95Great Shefford Obs. in England, 4 in MPEC 2012-F44 -- 2012 FM, 2012 EO8, 2012 EK5, 2012 EA12
A17Guidestar Obs. in Germany, 4 in MPEC 2012-F44 -- 2012 EO5, 2012 EG5, 2012 EB2, 2012 DU30
B15Inastars Obs. in Germany, 1 in MPEC 2012-F44 -- 2012 EG5
130Lumezzane Obs. in Italy, 16 in MPEC 2012-F44 -- 2012 DX75, 2012 DH4, 2012 DF61, 2012 CC17, 2012 CA55, 2012 BC20, 2004 QJ7, 2003 EO16, 1998 KN3, 306595, 275558, 263976, 155336, 154269, 152667, 9400
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-F44 -- 2012 CC29
C91Montevenere Obs., 2 in MPEC 2012-F44 -- 2012 EK8, 2012 EG5
A24New Millennium Obs. in Italy, 21 in MPEC 2012-F44 -- 2012 BJ134, 2012 AA11, 2011 SL102, 2004 QJ7, 2002 EM6, 85839, 32906, 275558, 24475, 21277, 163000, 152667, 141018, 138524, 138013, 137925, 101873, 6050, 4055, 3103, 1862
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPEC 2012-F44 -- 2012 ET14, 2012 EL5, 2004 BD68, 302311, 285540, 241370, 100926
J84South Obs. in England, 1 in MPEC 2012-F44 -- 2012 EB2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 March '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2322 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 FR1NEODyS16472021-2089692.72e-07-2.95-3.560NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2012-03-16.405 to 2012-03-19.237."
2012 FQ1NEODyS16472021-2059132.19e-07-3.46-3.860NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2012-03-16.169 to 2012-03-18.965."
2012 ET14NEODyS1647R E M O V E D-
JPL Sentry1647R E M O V E DJPL: Risk listing removed at 0852 UTC.
2012 EK5JPL Sentry16472070-2111133.0e-05-4.89-5.170JPL: "Analysis based on 24 observations spanning 6.5355 days (2012-Mar-13.44252 to 2012-Mar-19.978001)." Diameter approximately 0.026 km. from mean, weighted H=25.5.
NEODyS16472064-209053.78e-06-5.67-5.710NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2012-03-13.443 to 2012-03-19.979."
2012 EG5NEODyS1647R E M O V E D-
JPL Sentry1647R E M O V E DJPL: Risk listing removed at 0853 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 20 March '12

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

1759Updated Traffic Report
1647Noted that JPL Sentry has removed 2012 EG5 as an impact risk - see above
Noted that NEODyS has removed 2012 EG5 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 EK5 risk assessment - see above
Noted that NEODyS has posted 2012 EK5 as an impact risk - see above
Noted that JPL Sentry has removed 2012 ET14 as an impact risk - see above
Noted that NEODyS has removed 2012 ET14 as an impact risk - see above
Noted that NEODyS has posted 2012 FQ1 as an impact risk - see above
Noted that NEODyS has posted 2012 FR1 as an impact risk - see above
Grabbed MPEC 2012-F44 - Daily Orbit Update - see above