Contents  on 5 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 5 March '13

Two objects reported inside ten LD

Two visitors are reported to be inside ten lunar distances (LD) of our planet today. Intruder 2013 EC exits Earth's Hill sphere, passing from 3.24 to 7.68 LD. Further away, radar target 2013 ET comes within ten LD, moving from 12.29 to 9.69 LD.

Next known to be on approach, returning 2007 EO88 (risk-listed radar target) is calculated with some uncertainty to arrive inside ten LD on March 15th.

This report was generated at 1454 UTC with follow-up in today's DOU MPEC for 2013 ET, departed risk-listed 2013 CL22, and 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. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 5 March '13

The MPC's NEO Confirmation Page has 25 listings

When last checked at 2324 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 25 objects listed. Of these, nineteen were "one nighters." So far The Tracking News has counted a total of 43 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 5 March '13

Minor Planet Electronic Circulars

As of last check at 2324 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2013-E19 - "21:37 UT" - 2013 EP4

MPEC 2013-E18 - "21:33 UT" - 2013 ER4

MPEC 2013-E17 - "21:28 UT" - 2013 EQ4

MPEC 2013-E16 - "21:23 UT" - 2013 EO4

<< DOU on 5 Mar. '13 >>  MPEC 2013-E15 - "06:04 UT" - Daily Orbit Update

Observers  on 5 March '13

A total of 26 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 14 in MPECs 2013-E15, 2013-E16 & 2013-E17 -- 2013 EQ4, 2013 EO4, 2013 DU, 2013 DR9, 2013 DG, 2013 CX129, 2013 CW35, 2013 CT36, 2013 CQ35, 2013 CK89, 2013 CJ89, 2013 BY45, 2005 EM30, 276732
470Ceccano Obs. in Italy, 1 in MPEC 2013-E15 -- 2013 ET
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPEC 2013-E15 -- 2013 EA, 2013 AT76, 2008 DG17
F658David Tholen's team in Hawaii via Faulkes Telescope North in Hawaii, 2 in MPEC 2013-E15 -- 2013 CE129, 99942
J95Great Shefford Obs. in England, 3 in MPECs 2013-E15, 2013-E16 & 2013-E17 -- 2013 ET, 2013 EQ4, 2013 EO4
240Herrenberg Obs. in Germany, 4 in MPECs 2013-E15 & 2013-E17 -- 2013 EQ4, 267221, 159635, 153267
B15Inastars Obs. in Germany, 1 in MPEC 2013-E15 -- 137108
585Kiev Comet Station in the Ukraine, 2 in MPEC 2013-E15 -- 99942, 3752
560Madonna di Dossobuono Obs. in Italy, 5 in MPEC 2013-E15 -- 2013 EA, 2013 AU76, 2011 BK24, 2009 SC15, 2009 BL2
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-E18 -- 2013 ER4
711McDonald Obs. in Texas, 1 in MPEC 2013-E18 -- 2013 ER4
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2013-E16, 2013-E17 & 2013-E19 -- 2013 EQ4, 2013 EP4, 2013 EO4
F51Pan-STARRS 1 (PS1) in Hawaii, 13 in MPECs 2013-E15 & 2013-E18 -- 2013 ER4, 2013 CV83, 2011 SD173, 2011 BN24, 2009 YG, 1999 YG3, 350523, 204131, 163364, 141874, 136617, 8507, 5828
A53Peschiera del Garda Obs. in Italy, 3 in MPEC 2013-E15 -- 25916, 214869, 11405
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 2 in MPEC 2013-E15 -- 2009 AV, 99942
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2013-E15 -- 356394, 162900
071Rhozen Obs. in Bulgaria, 1 in MPEC 2013-E15 -- 141018
461SZTE Asteroid Program in Hungary, 2 in MPEC 2013-E15 -- 2005 DD, 7474
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2013-E15 -- 2013 ET
H36Sandlot Obs. in Kansas, 2 in MPEC 2013-E15 -- 2013 DU, 2013 DG
204Schiaparelli Obs. in Italy, 10 in MPEC 2013-E15 -- 2013 ET, 2013 CQ35, 2013 CL22, 2013 BY45, 2013 BE19, 2013 BC74, 2013 BC70, 2011 CS4, 2009 BL2, 2003 BB21
510Siegen Obs. in Germany, 1 in MPEC 2013-E15 -- 2013 ET
J84South Obs. in England, 1 in MPEC 2013-E15 -- 2013 ET
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2013-E15, 2013-E18 & 2013-E19 -- 2013 ER4, 2013 EP4, 2009 WO106, 2007 MK13
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2013-E17 -- 2013 EQ4
A48Verona Obs. in Italy, 1 in MPEC 2013-E15 -- 99942
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 March '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2324 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 CL22JPL Sentry1452206431.1e-06-5.87-5.960JPL: "Analysis based on 76 observations spanning 25.476 days (2013-Feb-05.05792 to 2013-Mar-02.53404)." Diameter approximately 0.039 km. from mean, weighted H=24.7.

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 5 March '13

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

2153Grabbed MPEC 2013-E16 - 2013 EO4 - see above
Grabbed MPEC 2013-E17 - 2013 EQ4 - see above
Grabbed MPEC 2013-E18 - 2013 ER4 - see above
Grabbed MPEC 2013-E19 - 2013 EP4 - see above
1454Generated Traffic Report
1452Noted that JPL Sentry has updated its 2013 CL22 risk assessment - see above
Grabbed MPEC 2013-E15 - Daily Orbit Update - see above