Contents  on 16 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 16 March '13

Six objects reported inside ten LD

Six visitors are reported to be within ten lunar distances (LD) of our planet today. Inside Earth's Hill sphere, tiny 2013 ED68 comes its closest to Earth this time around, reaching 1.40 LD at 0236 UT, and also its closest to the Moon -- 2.38 LD at 0233 UT. Further away, risk-listed radar target 2007 EO88, which hasn't been reported observed yet on this passage, is calculated to be inbound from 8.2 to 6.3 LD*. And the other objects are all outbound: radar target intruder 2013 EC20 from 4.51 to 5.13 LD, 2013 EA29 from 5.55 to 8.34 LD, 2013 ES41 from 7.71 to 9.02 LD, and 2013 EN20 leaves ten LD, moving from 8.8 to 10.4 LD*.

Next up, 2013 ES11 arrives inside ten LD on March 19th and risk-listed 2013 EL89 is calculated with large uncertainty to arrive on March 25th.

This report was generated at 1727 UTC with today's DOU MPEC reporting the first follow-up for 2013 ED68 and continuing observation of 2013 ES11.



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 16 March '13

The MPC's NEO Confirmation Page has 5 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had five objects listed. Of these, one was a "one nighter." So far The Tracking News has counted a total of fourteen 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 16 March '13

Minor Planet Electronic Circulars

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


MPEC 2013-F07 - "12:27 UT" - 2013 EX89


MPEC 2013-F06 - "12:22 UT" - 2013 EY89


MPEC 2013-F05 - "12:16 UT" - 2013 EW89


MPEC 2013-F04 - "12:11 UT" - 2013 EV89


<< DOU on 16 Mar. '13 >>  MPEC 2013-F03 - "06:06 UT" - Daily Orbit Update


MPEC 2013-F02 - "02:29 UT" - 2013 ES89


MPEC 2013-F01 - "02:24 UT" - 2013 ER89

Observers  on 16 March '13

A total of 27 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 18 in MPECs 2013-F01, 2013-F02 & 2013-F03 -- 2013 ES89, 2013 ES11, 2013 ER89, 2013 ER4, 2013 EQ4, 2013 EM20, 2013 EK28, 2013 EC28, 2013 DU, 2013 DG, 2013 CU129, 2013 BY45, 2013 AW60, 2013 AA32, 2011 EW16, 2005 TF15, 2002 JA9, 356285
B88Bigmuskie Obs. in Italy, 1 in MPEC 2013-F03 -- 99942
300Bisei Spaceguard Center in Japan, 3 in MPECs 2013-F01, 2013-F03 & 2013-F04 -- 2013 EV89, 2013 ER89, 2013 EM89
703Catalina Sky Survey (CSS) in Arizona, 13 in MPECs 2013-F01, 2013-F02, 2013-F03, 2013-F04 & 2013-F07 -- 2013 EX89, 2013 EV89, 2013 ES89, 2013 ES11, 2013 ER89, 2013 EH68, 2013 ED68, 350988, 198856, 141531, 3199, 2212, 1917
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPECs 2013-F01, 2013-F02, 2013-F03 & 2013-F07 -- 2013 EX89, 2013 ES89, 2013 ER89, 2013 CN35, 2013 AU27
448Desert Moon Obs. in New Mexico, 3 in MPEC 2013-F03 -- 2013 CN222, 354127, 163249
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2013-F03 -- 2013 EH89
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2013-F01 -- 2013 ER89
J95Great Shefford Obs. in England, 2 in MPECs 2013-F01 & 2013-F03 -- 2013 ER89, 2013 EH68
168Kourovskaya Obs. in Russia, 8 in MPEC 2013-F03 -- 68216, 356394, 349068, 343098, 229672, 203471, 192563, 4179
J131National Schools Obs. via the Liverpool Telescope in the Canary Islands, 1 in MPEC 2013-F03 -- 2013 CW35
H01Magdalena Ridge Obs. (MRO) in New Mexico, 6 in MPECs 2013-F01, 2013-F02, 2013-F04, 2013-F05, 2013-F06 & 2013-F07 -- 2013 EY89, 2013 EX89, 2013 EW89, 2013 EV89, 2013 ES89, 2013 ER89
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2013-F03 -- 2013 AU76
474Mt. John Obs. in New Zealand, 2 in MPECs 2013-F02 & 2013-F06 -- 2013 EY89, 2013 ES89
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2013-F03, 2013-F05 & 2013-F06 -- 2013 EY89, 2013 EW89, 2013 ES11, 2012 GV11, 267221, 8567
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2013-F03 -- 99942
I41Palomar Transient Factory (PTF) in southern California, 13 in MPEC 2013-F03 -- 2012 SD22, 2007 CN26, 2001 GQ2, 1995 DW1, 85990, 354713, 185853, 154658, 139289, 136617, 11311, 7480, 6050
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2013-F02 -- 2013 ES89
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 10 in MPEC 2013-F03 -- 2013 ES11, 2013 EM20, 2013 EA, 2011 BK24, 2009 UM3, 2005 EM30, 2000 EJ26, 1999 HA2, 68216, 350523
K33San Defendente Obs., 1 in MPEC 2013-F03 -- 2013 EA
H36Sandlot Obs. in Kansas, 2 in MPECs 2013-F01 & 2013-F02 -- 2013 ES89, 2013 ER89
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2013-F01 -- 2013 ER89
291Spacewatch 1.8m telescope in Arizona, 8 in MPECs 2013-F01, 2013-F03, 2013-F06 & 2013-F07 -- 2013 EY89, 2013 EX89, 2013 ER89, 2013 EM20, 2013 EH68, 2013 CE129, 2010 RM42, 2007 RM133
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2013-F01 & 2013-F02 -- 2013 ES89, 2013 ER89
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-F03 -- 1685
A48Verona Obs. in Italy, 1 in MPEC 2013-F03 -- 2013 EA
Q627program code 7 via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-F03 -- 163249
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2013 EL89NEODyS16222030-2112103.48e-06-5.96-6.360NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2013-03-14.252 to 2013-03-15.169."
2013 EH68JPL Sentry16222091-211262.0e-07-5.59-5.680JPL: "Analysis based on 24 observations spanning 2.0077 days (2013-Mar-13.46782 to 2013-Mar-15.47548)." Diameter approximately 0.095 km. from mean, weighted H=22.8.
NEODyS16222110-211011.33e-09-7.77-7.770NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2013-03-13.469 to 2013-03-15.476."

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 16 March '13

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

1727Generated Traffic Report
1622Noted 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 NEODyS has posted 2013 EL89 as an impact risk - see above
Grabbed MPEC 2013-F03 - Daily Orbit Update - see above
Grabbed MPEC 2013-F04 - 2013 EV89 - see above
Grabbed MPEC 2013-F05 - 2013 EW89 - see above
Grabbed MPEC 2013-F06 - 2013 EY89 - see above
Grabbed MPEC 2013-F07 - 2013 EX89 - see above
0307Grabbed MPEC 2013-F01 - 2013 ER89 - see above
Grabbed MPEC 2013-F02 - 2013 ES89 - see above