Contents  on 18 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 18 May '13

Two objects reported inside ten LD

There are two objects reported to be within ten lunar distances (LD) of Earth today, both newly discovered. Inside Earth's Hill sphere, 2013 KA is outbound from 2.13 to 2.67 LD, and, further out, 2013 KB is inbound from 7.16 to 5.84 LD. On approach next, 2009 FE arrives inside ten LD on June 2nd.

This report was updated at 1433 UTC with follow-up in today's DOU MPEC for 2013 JM22. Today's first traffic report was generated at 0344 UTC with the discoveries announced late yesterday of 2013 KB (MPEC), 2013 KA (MPEC), and departed risk-listed 2013 JD34 (MPEC).

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 18 May '13

The MPC's NEO Confirmation Page has 33 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 33 objects listed. Of these, 21 were "one nighters." So far The Tracking News has counted a total of 55 listings on the NEOCP today.

New MPECs  on 18 May '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-K13 - "18:19 UT" - 2013 JX28 = 2006 KZ39

<< DOU on 18 May '13 >>  MPEC 2013-K12 - "06:05 UT" - Daily Orbit Update

Observers  on 18 May '13

Thirteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPEC 2013-K12 -- 2013 JX2, 2013 JR28, 2013 JQ22, 2013 JP4, 2013 JM22, 2013 JM14, 2013 JL14, 2013 JK22, 2013 HN11, 2013 GW79, 2013 GU38, 2013 GE84
703Catalina Sky Survey (CSS) in Arizona, 9 in MPEC 2013-K12 -- 2011 WU95, 2009 SQ104, 2008 VN, 2006 HB, 85989, 68216, 141670, 6050, 4015
448Desert Moon Obs. in New Mexico, 3 in MPEC 2013-K12 -- 2013 JX2, 2013 JQ22, 2013 JL22
J95Great Shefford Obs. in England, 1 in MPEC 2013-K12 -- 2013 JR28
168Kourovskaya Obs. in Russia, 9 in MPEC 2013-K12 -- 66008, 362310, 350988, 137170, 11284, 7888, 6047, 5828, 2062
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPEC 2013-K12 -- 2013 JZ28, 2013 JG29, 2013 JE29, 2013 JA29
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPEC 2013-K12 -- 2013 JT17, 2013 JS17, 2013 JE29, 2010 CE55, 1997 WQ23, 8014
C47Nonndorf Obs. in Austria, 1 in MPEC 2013-K12 -- 2013 JM22
H36Sandlot Obs. in Kansas, 4 in MPEC 2013-K12 -- 2013 JU17, 2013 JO4, 2013 JE29, 2013 HP11
G401program code 1 via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2013-K12 -- 242643
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2013-K12 -- 350462, 265196
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2013-K12 -- 2013 JU17, 2007 TR24
Q620program code 0 via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-K12 -- 285263
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 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 JD34NEODyS13332058-205817.93e-10-8.87-8.870NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2013-05-15.384 to 2013-05-17.312."
2013 JR28JPL Sentry1333R E M O V E DJPL: Risk listing removed at 0950 UTC.
NEODyS1333R E M O V E D-
2013 JS17JPL Sentry1333R E M O V E DJPL: Risk listing removed at 0951 UTC.
NEODyS1333R E M O V E D-

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 18 May '13

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

1825Grabbed MPEC 2013-K13 - 2013 JX28 = 2006 KZ39 - see above
1433Updated Traffic Report
1333Noted that NEODyS has posted 2013 JD34 as an impact risk - see above
Noted that JPL Sentry has removed 2013 JR28 as an impact risk - see above
Noted that NEODyS has removed 2013 JR28 as an impact risk - see above
Noted that JPL Sentry has removed 2013 JS17 as an impact risk - see above
Noted that NEODyS has removed 2013 JS17 as an impact risk - see above
Grabbed MPEC 2013-K12 - Daily Orbit Update - see above