Contents  on 16 May '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 May '13

One object reported inside ten LD

One visitor is reported traveling within ten lunar distances (LD) of our planet today. Risk-listed 2013 JM22 comes its closest to Earth this time around, reaching 7.90 LD at 1411 UT. Approaching ten LD next, 2009 FE arrives on June 2nd.

This report was generated at 1241 UTC with follow-up in today's DOU MPEC for 2013 JM22 and departed 2013 JF1.

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. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 16 May '13

The MPC's NEO Confirmation Page has 55 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 55 objects listed. Of these, nineteen were "one nighters." So far The Tracking News has counted a total of 65 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 May '13

Minor Planet Electronic Circulars

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

<< DOU on 16 May '13 >>  MPEC 2013-K01 - "06:04 UT" - Daily Orbit Update

Observers  on 16 May '13

Twelve observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPEC 2013-K01 -- 2013 JL22, 2013 EM20, 11405
703Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2013-K01 -- 2002 GS, 89958, 137044, 7839
I57Elche Obs., 2 in MPEC 2013-K01 -- 137170, 11405
Z81Estrella de Mar Obs., 1 in MPEC 2013-K01 -- 2013 JO4
006Fabra Obs. in Spain, 1 in MPEC 2013-K01 -- 242643
J95Great Shefford Obs. in England, 1 in MPEC 2013-K01 -- 2013 JM22
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2013-K01 -- 141495
I41Palomar Transient Factory in southern California, 1 in MPEC 2013-K01 -- 357005
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2013-K01 -- 2013 JF1
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-K01 -- 2013 JO4
033Schwarzschild Obs. in Germany, 2 in MPEC 2013-K01 -- 2013 JM22, 2013 JL22
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2013-K01 -- 2010 GW62
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 May '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 JR28NEODyS12362047-2101111.0e-08-6.08-6.610NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2013-05-12.434 to 2013-05-14.940."
2013 JM22NEODyS1236R E M O V E D-
JPL Sentry1236209511.8e-08-6.64-6.640JPL: "Analysis based on 61 observations spanning 3.7723 days (2013-May-12.34486 to 2013-May-16.117174)." Diameter approximately 0.077 km. from mean, weighted H=23.2.

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 May '13

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

1241Generated Traffic Report
1236Noted that JPL Sentry has updated its 2013 JM22 risk assessment - see above
Noted that NEODyS has removed 2013 JM22 as an impact risk - see above
Noted that NEODyS has posted 2013 JR28 as an impact risk - see above
Grabbed MPEC 2013-K01 - Daily Orbit Update - see above