Contents  on 9 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 9 May '13

One object reported inside ten LD

There is one asteroid reported to be within ten lunar distances (LD) of Earth today. 2013 JR7 is inbound from 9.26 to 9.11 LD. No other objects are known to be coming inside ten LD until late July.

This report was updated at 1547 UTC with follow-up in today's DOU MPEC for departed 2013 JF1 and 2013 GD55. Today's first traffic report was generated at 0122 UTC with the discovery of 2013 JR7, which was announced late yesterday (MPEC).

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.

Radar Astrometry  on 9 May '13

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data update noted at 2216 UTC when the database was dated 9 May

NEOCP Activity  on 9 May '13

The MPC's NEO Confirmation Page has 40 listings

When last checked at 2349 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 40 objects listed. Of these, 28 were "one nighters." So far The Tracking News has counted a total of 41 listings on the NEOCP today.

New MPECs  on 9 May '13

Minor Planet Electronic Circulars

As of last check at 2357 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 9 May '13 >>  MPEC 2013-J32 - "06:04 UT" - Daily Orbit Update

Observers  on 9 May '13

Fourteen observers appear in today's MPEC.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 242643
H21Astronomical Research Obs. Westfield in Illinois, 26 in MPEC 2013-J32 -- 2013 JX2, 2013 JF1, 2013 JE1, 2013 HP11, 2013 HO11, 2013 HN11, 2013 HJ19, 2013 GZ79, 2013 GY73, 2013 GY68, 2013 GV68, 2013 GU79, 2013 GQ38, 2013 GE84, 2013 GC34, 2013 FY13, 2013 FW13, 2013 FD11, 2013 EU9, 2013 EL28, 2013 AF4, 2012 XY6, 2012 XF55, 2005 ND7, 2000 EV106, 276049
493Calar Alto Obs. in Spain, 1 in MPEC 2013-J32 -- 65803
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPEC 2013-J32 -- 2013 JY2, 2013 JF1, 2013 JC, 2013 HV14, 2013 GF, 2013 BQ45, 2012 XY6, 2012 XC112, 2012 WB25, 2012 MR4, 2005 EJ94
C73Galati Obs. in Romania, 8 in MPEC 2013-J32 -- 2013 JF1, 2013 EU9, 2000 WL63, 66391, 242643, 152756, 141495, 8176
E89Geyserland Obs. in New Zealand, 1 in MPEC 2013-J32 -- 285263
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 242643
J95Great Shefford Obs. in England, 2 in MPEC 2013-J32 -- 2013 JX2, 2013 HO11
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2013-J32 -- 2013 HM11, 2009 FE
900Moriyama Obs. in Japan, 1 in MPEC 2013-J32 -- 242643
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPEC 2013-J32 -- 2009 FE, 163001, 159635, 4179
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPEC 2013-J32 -- 2013 GD55, 2009 UK, 2008 VN, 2007 AS12, 1997 WQ23, 68348, 154453, 7839
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2013-J32 -- 2013 GF69, 2003 JC13
Q620program code 0 via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-J32 -- 242643
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 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
2009 VZ39JPL Sentry04042013-21107886.9e-06-6.25-7.480JPL: "Analysis based on 8 observations spanning .04342 days (2009-Nov-10.27204 to 2009-Nov-10.31546)." Diameter approximately 0.009 km. from mean, weighted H=27.9.

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 9 May '13

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

2216Noted Radar Astrometry database update - see above
1547Updated Traffic Report
1530Grabbed MPEC 2013-J32 - Daily Orbit Update - see above
0404Noted that JPL Sentry has updated its 2009 VZ39 risk assessment - see above