Contents  on 13 March '13

Asteroid/Comet Connection (A/CC) Resources:

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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 13 March '13

Five objects reported inside ten LD

Five visitors are reported to be within ten lunar distances (LD) of our planet today. Inside Earth's Hill sphere, intruder and radar target 2013 EC20 is outbound from 2.62 to 3.25 LD. Further away, 2013 EN20 is outbound from 4.0 to 5.6 LD*, 2013 EA29 is inbound from 6.55 to 4.18 LD, newly announced 2013 ES41 comes its closest to Earth this time around, reaching 6.47 LD at 2350 UT, and radar target 2013 ET exits ten LD, passing from 9.66 to 12.26 LD.

Next up, 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 1558 UTC with new discoveries 2013 ES41 (MPEC) and departed 2013 EQ41 (MPEC), and follow-up in today's DOU MPEC for 2013 ES11 as well as observation of distant 136617 1994 CC.

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 13 March '13

The MPC's NEO Confirmation Page has 16 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had sixteen objects listed. Of these, ten were "one nighters." So far The Tracking News has counted a total of 24 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 13 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-E58 - "11:37 UT" - 2013 ES41

MPEC 2013-E57 - "11:32 UT" - 2013 ER41

MPEC 2013-E56 - "11:26 UT" - 2013 EQ41

MPEC 2013-E55 - "11:21 UT" - 2013 EP41

<< DOU on 13 Mar. '13 >>  MPEC 2013-E54 - "06:05 UT" - Daily Orbit Update

Observers  on 13 March '13

Eighteen observers appear in today's MPECs.

CodeObserver / observatory
C77Bernezzo Obs. in Italy, 1 in MPEC 2013-E54 -- 2013 EA
703Catalina Sky Survey (CSS) in Arizona, 13 in MPECs 2013-E54, 2013-E56 & 2013-E58 -- 2013 ES41, 2013 EQ41, 2013 EA, 2013 CK89, 2012 TJ146, 2008 AU26, 353947, 353190, 267221, 19764, 141052, 136617, 2368
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 14 in MPECs 2013-E54 & 2013-E57 -- 2013 EY27, 2013 EU9, 2013 ET9, 2013 ES9, 2013 ES11, 2013 ER41, 2013 EC28, 2013 DZ, 2013 CZ133, 2012 YN6, 2012 SG32, 2010 TU54, 2007 YX1, 2002 YZ3
448Desert Moon Obs. in New Mexico, 5 in MPEC 2013-E54 -- 2008 EQ7, 341816, 277142, 267221, 8176
J95Great Shefford Obs. in England, 1 in MPEC 2013-E56 -- 2013 EQ41
H15ISON-NM Obs. in New Mexico, 2 in MPEC 2013-E54 -- 275974, 19764
W85LCOGT Cerro Tololo A in Chile, 2 in MPECs 2013-E54 & 2013-E57 -- 2013 ER41, 2013 EB34
130Lumezzane Obs. in Italy, 4 in MPEC 2013-E54 -- 2013 AU76, 2011 BK24, 214869, 152889
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPEC 2013-E54 -- 2013 AE69, 2012 TJ146, 2000 EJ26, 88264, 274855, 177049, 4179
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPECs 2013-E54 & 2013-E55 -- 2013 EP41, 2012 LK9, 40267, 351545, 22753, 11405, 11054, 1862
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2013-E54 -- 2013 ES11, 2013 EA, 2009 UM3, 214869
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2013-E54 -- 2013 CN128
H36Sandlot Obs. in Kansas, 4 in MPECs 2013-E55, 2013-E56, 2013-E57 & 2013-E58 -- 2013 ES41, 2013 ER41, 2013 EQ41, 2013 EP41
204Schiaparelli Obs. in Italy, 1 in MPEC 2013-E55 -- 2013 EP41
E12Siding Spring Survey in New South Wales, 1 in MPEC 2013-E57 -- 2013 ER41
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2013-E54 -- 2009 UM3
291Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2013-E54, 2013-E55 & 2013-E56 -- 2013 EQ41, 2013 EP41, 2013 EL28, 2013 EB34, 2013 AX52, 2009 JR5
926Tenagra II Obs. in Arizona, 2 in MPEC 2013-E54 -- 2013 EU9, 3199
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 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 EQ41JPL Sentry14052066-210421.1e-08-8.42-8.420JPL: "Analysis based on 14 observations spanning 1.8282 days (2013-Mar-11.48045 to 2013-Mar-13.30863)." Diameter approximately 0.025 km. from mean, weighted H=25.7.
2013 EB34NEODyS1405R E M O V E D-
JPL Sentry1405R E M O V E DJPL: Risk listing removed at 0951 UTC.
2013 EL28JPL Sentry1405R E M O V E DJPL: Risk listing removed at 0948 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 13 March '13

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

1558Generated Traffic Report
1405Noted that JPL Sentry has removed 2013 EB34 as an impact risk - see above
Noted that NEODyS has removed 2013 EB34 as an impact risk - see above
Noted that JPL Sentry has removed 2013 EL28 as an impact risk - see above
Noted that JPL Sentry has posted 2013 EQ41 as an impact risk - see above
Grabbed MPEC 2013-E54 - Daily Orbit Update - see above
Grabbed MPEC 2013-E55 - 2013 EP41 - see above
Grabbed MPEC 2013-E56 - 2013 EQ41 - see above
Grabbed MPEC 2013-E57 - 2013 ER41 - see above
Grabbed MPEC 2013-E58 - 2013 ES41 - see above