Contents  on 12 March '13

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 12 March '13

Four objects reported inside ten LD

There are four objects reported to be within ten lunar distances (LD) of Earth today. Inside Earth's Hill sphere, radar target intruder 2013 EC20 is outbound from 1.99 to 2.62 LD and 2013 EN20 exits the sphere, moving from 2.5 to 4.0 LD. Further out, 2013 EA29 is inbound from 9.49 to 6.56 LD and radar target 2013 ET is outbound from 7.12 to 9.66 LD.

Next known to be on approach, risk-listed radar target 2010 EO88 arrives inside ten LD on March 15th and 2013 ES11 arrives on March 19th.

This report was generated at 1356 UTC with follow-up in today's DOU MPEC for 2013 EA29, 2013 ES11, and 2013 ET. We also note that radar observation of 2013 ET was posted late yesterday.

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. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 12 March '13

The MPC's NEO Confirmation Page has 10 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had ten objects listed. Of these, four were "one nighters." So far The Tracking News has counted a total of 23 listings on the NEOCP today.

New MPECs  on 12 March '13

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 2013-E53 - "14:16 UT" - 2013 EB34

MPEC 2013-E52 - "14:12 UT" - 2013 EA34

MPEC 2013-E51 - "12:05 UT" - 2013 CN128

<< DOU on 12 Mar. '13 >>  MPEC 2013-E50 - "06:05 UT" - Daily Orbit Update

Observers  on 12 March '13

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
703Catalina Sky Survey (CSS) in Arizona, 6 in MPECs 2013-E50 & 2013-E51 -- 2013 CN128, 22771, 214869, 162168, 162063, 153267
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPEC 2013-E50 -- 2013 EY27, 2013 EU9, 2013 ET9, 2013 ES9, 2013 ES11, 2013 EC28, 2013 DZ, 2013 BD70, 2013 AQ27, 2006 YF, 161998
807~program code "~" (34) via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2013-E50 -- 2013 ET
448Desert Moon Obs. in New Mexico, 1 in MPEC 2013-E50 -- 2013 DR9
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 3 in MPEC 2013-E50 -- 2013 EW27, 2013 EC28, 2013 EA
J95Great Shefford Obs. in England, 1 in MPEC 2013-E50 -- 2013 EA29
C01Lohrmann Obs. in Germany, 1 in MPEC 2013-E50 -- 99942
C41MASTER-II Obs. Kislovodsk in Russia, 1 in MPEC 2013-E50 -- 3752
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-E52 -- 2013 EA34
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2013-E50 & 2013-E53 -- 2013 EB34, 177016, 139289
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2013-E52 -- 2013 EA34
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2013-E50 -- 2013 ET
E12Siding Spring Survey in New South Wales, 1 in MPEC 2013-E50 -- 96189
291Spacewatch 1.8m telescope in Arizona, 13 in MPECs 2013-E50, 2013-E51, 2013-E52 & 2013-E53 -- 2013 EW27, 2013 ER, 2013 ED28, 2013 EB34, 2013 EA34, 2013 CT82, 2013 CN128, 2013 BO76, 2012 XY6, 2012 VO6, 2005 YO180, 2004 BL86, 2003 HB
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-E50 -- 2013 CW35
G56Walnut Creek Obs. in northern California, 2 in MPEC 2013-E50 -- 2013 EC28, 2013 EA
718Wiggins Obs. in Utah, 1 in MPEC 2013-E50 -- 2013 EA
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 March '13

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
2013 EB34JPL Sentry16032026-210387.8e-09-7.57-7.990JPL: "Analysis based on 10 observations spanning .97569 days (2013-Mar-11.26946 to 2013-Mar-12.24515)." Diameter approximately 0.042 km. from mean, weighted H=24.5.
NEODyS16032100-210014.38e-09-8.20-8.20NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2013-03-11.270 to 2013-03-12.246."
2013 ED28JPL Sentry13532019-2047261.1e-05-2.55-3.210JPL: "Analysis based on 23 observations spanning 4.9364 days (2013-Mar-07.21735 to 2013-Mar-12.15377)." Diameter approximately 0.177 km. from mean, weighted H=21.4.
NEODyS13532031-2037109.97e-06-2.61-2.930NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2013-03-07.218 to 2013-03-12.155."
2008 EM68JPL Sentry04412013-21105654.6e-06-5.75-6.280JPL: "Analysis based on 11 observations spanning .11019 days (2008-Mar-08.25164 to 2008-Mar-08.36183)." Diameter approximately 0.010 km. from mean, weighted H=27.5.

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 12 March '13

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

1603Noted that JPL Sentry has posted 2013 EB34 as an impact risk - see above
Noted that NEODyS has posted 2013 EB34 as an impact risk - see above
1423Grabbed MPEC 2013-E52 - 2013 EA34 - see above
Grabbed MPEC 2013-E53 - 2013 EB34 - see above
1356Generated Traffic Report
1353Noted that JPL Sentry has updated its 2013 ED28 risk assessment - see above
Noted that NEODyS has updated its 2013 ED28 risk assessment - see above
Grabbed MPEC 2013-E50 - Daily Orbit Update - see above
Grabbed MPEC 2013-E51 - 2013 CN128 - see above
0441Noted that JPL Sentry has updated its 2008 EM68 risk assessment - see above