Contents  on 19 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 19 March '13

Five objects reported inside ten LD

Five objects are reported passing within ten lunar distances (LD) of our planet today. 2007 EO88 (risk-listed radar target) is calculated to be moving from 4.4 to 5.2 LD*, 2013 ED68 is outbound from 4.50 to 5.92 LD and radar target intruder 2013 EC20 from 6.39 to 7.01 LD, while 2013 ES11 enters ten LD, coming in from 11.24 to 9.36 LD, as does 2013 FG, coming from 11.6 to 9.7 LD*.

Headed our our way next, risk-listed 2013 EL89 arrives inside ten LD on March 25th.

This report was generated at 1401 UTC with follow-up in today's DOU MPEC for 2013 EL89 and departed 2013 EE68.

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 19 March '13

The MPC's NEO Confirmation Page has 22 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 22 objects listed. Of these, sixteen were "one nighters." So far The Tracking News has counted a total of 25 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 19 March '13

Minor Planet Electronic Circulars

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

MPEC 2013-F25 - "20:35 UT" - 2013 ET9 = 2002 TO301

MPEC 2013-F24 - "19:58 UT" - 2010 CE55 = 2013 FJ

MPEC 2013-F23 - "18:33 UT" - 2010 FO92

<< DOU on 19 Mar. '13 >>  MPEC 2013-F22 - "06:06 UT" - Daily Orbit Update

MPEC 2013-F21 - "03:51 UT" - 2001 TA2 = 2013 FH

Observers  on 19 March '13

Fifteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPECs 2013-F23 & 2013-F25 -- 2013 ET9, 2010 FO92
703Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2013-F22 -- 2009 SC15, 1999 HA2
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPEC 2013-F22 -- 2013 EY27, 2013 EW27, 2013 EP89, 2013 EH89, 2013 EE68, 2013 CN128, 2013 CL89, 2011 MW1, 2007 JZ20, 2003 LO6, 350462
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 2 in MPEC 2013-F22 -- 2013 EW108, 2013 CV83
F658David Tholen's team in Hawaii via Faulkes Telescope North in Hawaii, 1 in MPEC 2013-F22 -- 99942
682Kanab Obs. in Utah, 1 in MPEC 2013-F22 -- 2013 EK89
W86LCOGT Cerro Tololo B in Chile, 1 in MPEC 2013-F22 -- 2013 FJ
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPEC 2013-F22 -- 2012 QP17, 2011 WU95, 2009 SC15, 39796, 11284
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2013-F25 -- 2013 ET9
I41Palomar Transient Factory in southern California, 1 in MPEC 2013-F22 -- 2000 BE19
H36Sandlot Obs. in Kansas, 2 in MPEC 2013-F22 -- 2013 EM89, 2013 EL89
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPEC 2013-F22 -- 2013 CW35, 2010 VA1, 1685
691Spacewatch 0.9m telescope in Arizona, 11 in MPEC 2013-F22 -- 2013 EK89, 2013 CX129, 2009 UM3, 354952, 350988, 274855, 19764, 162168, 11284, 2329, 2061
291Spacewatch 1.8m telescope in Arizona, 5 in MPECs 2013-F22 & 2013-F24 -- 2013 FJ, 2013 EV108, 2013 EQ, 2013 EH68, 2013 CT36
926Tenagra II Obs. in Arizona, 2 in MPEC 2013-F22 -- 2013 EE68, 2368
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 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 FJNEODyS1355R E M O V E D-
JPL Sentry1355R E M O V E DJPL: Risk listing removed at 1037 UTC.
2013 EV108JPL Sentry13552078-209427.3e-08-5.05-5.080JPL: "Analysis based on 29 observations spanning 9.7637 days (2013-Mar-09.38736 to 2013-Mar-19.15111)." Diameter approximately 0.280 km. from mean, weighted H=20.4.
NEODyS13552078-207811.8e-10-7.61-7.610NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2013-03-09.388 to 2013-03-19.152."
2013 EL89JPL Sentry1355209711.4e-08-8.55-8.550JPL: "Analysis based on 24 observations spanning 4.8878 days (2013-Mar-14.25151 to 2013-Mar-19.13928)." Diameter approximately 0.024 km. from mean, weighted H=25.8.
NEODyS13552067-206711.2e-09-9.42-9.420NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2013-03-14.252 to 2013-03-19.140."
2013 EH68JPL Sentry1355210511.6e-08-6.75-6.750JPL: "Analysis based on 40 observations spanning 4.8132 days (2013-Mar-13.46782 to 2013-Mar-18.28098)." Diameter approximately 0.089 km. from mean, weighted H=22.9.
NEODyS13552095-209516.44e-08-6.05-6.050NEODyS: "Based on 40 optical observations (of which 0 are rejected as outliers) from 2013-03-13.469 to 2013-03-18.282."

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 19 March '13

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

2047Grabbed MPEC 2013-F24 - 2010 CE55 = 2013 FJ - see above
Grabbed MPEC 2013-F25 - 2013 ET9 = 2002 TO301 - see above
1901Grabbed MPEC 2013-F23 - 2010 FO92 - see above
1401Generated Traffic Report
1355Noted that JPL Sentry has updated its 2013 EH68 risk assessment - see above
Noted that NEODyS has updated its 2013 EH68 risk assessment - see above
Noted that JPL Sentry has updated its 2013 EL89 risk assessment - see above
Noted that NEODyS has reposted 2013 EL89 as an impact risk - see above
Noted that JPL Sentry has updated its 2013 EV108 risk assessment - see above
Noted that NEODyS has updated its 2013 EV108 risk assessment - see above
Noted that JPL Sentry has removed 2013 FJ as an impact risk - see above
Noted that NEODyS has removed 2013 FJ as an impact risk - see above
Grabbed MPEC 2013-F22 - Daily Orbit Update - see above
0448Grabbed MPEC 2013-F21 - 2001 TA2 = 2013 FH - see above