Contents  on 17 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 17 March '13

Five objects reported inside ten LD

There are five asteroids reported flying within ten lunar distances (LD) of our planet today. Inside Earth's Hill sphere, 2013 ED68 is outbound from 1.92 to 3.13 LD. More distantly, risk-listed radar target 2007 EO88 is calculated, with no observations reported so far on this passage, to be inbound from 6.3 to 4.9 LD*, radar target intruder 2013 EC20 is outbound from 5.13 to 5.76 LD, and two objects are leaving our ten-LD reporting boundary: 2013 EA29 travels from 8.34 to 11.39 LD and 2013 ES41 from 9.02 to 10.58 LD.

On approach next, 2013 ES11 arrives inside ten LD on March 19th and risk-listed 2013 EL89 is calculated with some uncertainty to arrive on March 25th.

This report was generated at 1645 UTC with today's DOU MPEC carrying the first follow-up for 2013 EL89 as well as follow-up for 2013 ES11 and departed objects 2013 EE68 and 2013 EQ41.

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 17 March '13

The MPC's NEO Confirmation Page has 14 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fourteen objects listed. Of these, six were "one nighters." So far The Tracking News has counted a total of sixteen 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 17 March '13

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 17 Mar. '13 >>  MPEC 2013-F08 - "06:07 UT" - Daily Orbit Update

Observers  on 17 March '13

Fifteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPEC 2013-F08 -- 2013 ES11, 2013 EK28
703Catalina Sky Survey (CSS) in Arizona, 5 in MPEC 2013-F08 -- 2013 EM20, 2013 CQ35, 350513, 276732, 1864
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 12 in MPEC 2013-F08 -- 2013 ET9, 2013 ES9, 2013 ES89, 2013 ER41, 2013 EP89, 2013 EM89, 2013 EK89, 2013 EH89, 2013 EH68, 2013 EG68, 2012 XF112, 267223
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2013-F08 -- 2013 EH89
G32Elena Remote Obs., 1 in MPEC 2013-F08 -- 162168
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPEC 2013-F08 -- 2013 EL89, 2013 ED28
711McDonald Obs. in Texas, 2 in MPEC 2013-F08 -- 2013 EW89, 2013 ED28
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPEC 2013-F08 -- 2013 CZ133, 2011 BK24, 2005 EG94, 350513, 162210, 154589, 7358, 5189
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 8 in MPEC 2013-F08 -- 2013 ET9, 2013 EA, 2013 AU76, 2009 UM3, 2009 AV, 99942, 214869, 206910
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2013-F08 -- 4179
233San Vito Obs. in Italy, 3 in MPEC 2013-F08 -- 99942, 11405, 4179
033Schwarzschild Obs. in Germany, 7 in MPEC 2013-F08 -- 2013 EY27, 2013 ER41, 2013 EM89, 2013 EH89, 2013 EE68, 2013 EC68, 2013 EB34
E12Siding Spring Survey in New South Wales, 1 in MPEC 2013-F08 -- 2010 GY6
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2013-F08 -- 2013 EY27, 2013 EQ41, 2013 EO4, 2013 EL28, 2013 EH68, 2006 WQ1
G52Stone Edge Obs. in northern California, 11 in MPEC 2013-F08 -- 2013 EL28, 2013 EC28, 2013 EA, 2013 AM60, 2012 TJ146, 2012 TA219, 2012 QF49, 2009 SN98, 2007 CN26, 2005 ES70, 2000 DL8
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 March '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2359 and JPL at 2358 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 EL89JPL Sentry15142032-206824.2e-09-8.77-8.940JPL: "Analysis based on 22 observations spanning 2.9279 days (2013-Mar-14.25151 to 2013-Mar-17.1794)." Diameter approximately 0.024 km. from mean, weighted H=25.8.
NEODyS1514R E M O V E D-
2013 EH68JPL Sentry15142091-210544.3e-08-6.29-6.330JPL: "Analysis based on 30 observations spanning 3.0100 days (2013-Mar-13.46782 to 2013-Mar-16.47785)." Diameter approximately 0.091 km. from mean, weighted H=22.8.
NEODyS15142095-211025.42e-08-6.11-6.110NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2013-03-13.469 to 2013-03-16.479."
2013 EQ41NEODyS1514R E M O V E D-
2013 ED28JPL Sentry15142031-203871.2e-05-2.59-2.690JPL: "Analysis based on 35 observations spanning 9.9252 days (2013-Mar-07.21735 to 2013-Mar-17.14253)." Diameter approximately 0.180 km. from mean, weighted H=21.4.
NEODyS15142036-204147.04e-06-2.83-2.840NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2013-03-07.218 to 2013-03-17.143."

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 17 March '13

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

1645Generated Traffic Report
1514Noted that JPL Sentry has updated its 2013 ED28 risk assessment - see above
Noted that NEODyS has updated its 2013 ED28 risk assessment - see above
Noted 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 removed 2013 EL89 as an impact risk - see above
Noted that NEODyS has removed 2013 EQ41 as an impact risk - see above
Grabbed MPEC 2013-F08 - Daily Orbit Update - see above