Contents  on 22 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 22 March '13

Five objects reported inside ten LD

Five visitors are reported to be within a radius of ten lunar distances (LD) from our home planet today. 2013 FG is inbound from 6.1 to 4.7 LD*. 2013 ES11 comes its closest to Earth on this passage, reaching 6.31 LD at 2133 UT. Radar target intruder 2013 EC20 is outbound from 8.27 to 8.90 LD. And two objects depart from within our ten-LD reporting "bubble." Risk-listed 2007 EO88 apparently escapes without being reported observed, calculated with some major uncertainty to travel from 8.7 to 10.8 LD*. And 2013 ED68 moves from 8.81 to 10.27 LD.

Coming toward Earth next, 2013 FD8 arrives inside ten LD on March 24th, and a day later 2013 FB8 and risk-listed 2013 EL89 arrive.

This report was generated at 1402 UTC with follow-up in today's DOU MPEC for 2013 FB8, 2013 EL89, and departed objects 2013 EE68 and risk-listed 2013 FK.

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 22 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 seven 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 22 March '13

Minor Planet Electronic Circulars

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

MPEC 2013-F41 - "17:04 UT" - 2013 FQ10

<< DOU on 22 Mar. '13 >>  MPEC 2013-F40 - "06:06 UT" - Daily Orbit Update

Observers  on 22 March '13

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 19 in MPEC 2013-F40 -- 2013 FC8, 2013 FB8, 2013 EW27, 2013 ET9, 2013 EQ4, 2013 EM89, 2013 EL89, 2013 EK28, 2013 EH89, 2013 EE68, 2013 EC68, 2013 EC28, 2013 EA, 2013 DR9, 2013 CQ35, 2006 JY25, 22771, 214869, 1864
B88Bigmuskie Obs. in Italy, 1 in MPEC 2013-F40 -- 2013 AU76
300Bisei Spaceguard Center in Japan, 1 in MPEC 2013-F40 -- 2013 FF8
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPECs 2013-F40 & 2013-F41 -- 2013 FZ7, 2013 FX7, 2013 FQ10, 2013 FK, 2013 FA8, 2013 EZ108, 2006 WS1
958Dax Obs. in France, 1 in MPEC 2013-F40 -- 2013 FF8
203GiaGa Obs. in Italy, 2 in MPEC 2013-F40 -- 2013 FB8, 2013 EV108
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2013-F41 -- 2013 FQ10
711McDonald Obs. in Texas, 3 in MPECs 2013-F40 & 2013-F41 -- 2013 FQ10, 2011 BB45, 1998 QA1
I41Palomar Transient Factory in southern California, 1 in MPEC 2013-F40 -- 40267
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2013-F40 & 2013-F41 -- 2013 FQ10, 2013 FF8
H23Pear Tree Obs. in Florida, 1 in MPEC 2013-F40 -- 2013 EA
A53Peschiera del Garda Obs. in Italy, 3 in MPEC 2013-F40 -- 2013 EA, 2009 UM3, 2009 SC15
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPEC 2013-F40 -- 2009 SN98, 354952, 2329
233San Vito Obs. in Italy, 2 in MPEC 2013-F40 -- 2009 SC15, 11405
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2013-F40 -- 2013 FF8
204Schiaparelli Obs. in Italy, 2 in MPEC 2013-F40 -- 2013 FF8, 2013 FB8
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2013-F40 -- 2013 FF8, 2013 EL89
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2013-F40 -- 2013 FF8
G56Walnut Creek Obs. in northern California, 1 in MPEC 2013-F40 -- 2013 EV108
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-F40 -- 2013 FF8
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 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 FKJPL Sentry1400R E M O V E DJPL: Risk listing removed at 0950 UTC.
2013 EV108JPL Sentry1400R E M O V E DJPL: Risk listing removed at 0950 UTC.
2013 EL89JPL Sentry14002097-210227.1e-09-8.92-8.970JPL: "Analysis based on 40 observations spanning 7.0007 days (2013-Mar-14.25151 to 2013-Mar-21.25216)." Diameter approximately 0.023 km. from mean, weighted H=25.9.

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 22 March '13

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

1740Grabbed MPEC 2013-F41 - 2013 FQ10 - see above
1402Generated Traffic Report
1400Noted that JPL Sentry has updated its 2013 EL89 risk assessment - see above
Noted that JPL Sentry has removed 2013 EV108 as an impact risk - see above
Noted that JPL Sentry has removed 2013 FK as an impact risk - see above
Grabbed MPEC 2013-F40 - Daily Orbit Update - see above