Contents  on 29 April '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 29 April '13

One object reported inside ten LD

One object is reported moving inside ten lunar distances (LD) of Earth today. 2013 GH66 is outbound from 7.64 to 8.04 LD. No other objects are known to come within ten LD until late July.

This report was generated at 1433 UTC.

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 29 April '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 2359 UTC when the database was dated 29 April

NEOCP Activity  on 29 April '13

The MPC's NEO Confirmation Page has 1 listing

When last checked at 1953 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one object listed. This was a "one nighter." The Tracking News counted a total of two listings on the NEOCP on this day.

New MPECs  on 29 April '13

Minor Planet Electronic Circulars

There was one MPEC posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 29 Apr. '13 >>  MPEC 2013-H49 - "06:02 UT" - Daily Orbit Update

Observers  on 29 April '13

Twelve observers appeared in this day's MPEC.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 7888
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPEC 2013-H49 -- 40267, 350988, 11284, 1917
160Castelmartini Obs. in Italy, 6 in MPEC 2013-H49 -- 2013 EO126, 2009 SC15, 354952, 274855, 214869, 206910
448Desert Moon Obs. in New Mexico, 3 in MPEC 2013-H49 -- 2013 HO11, 2013 GV68, 2013 ET9
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 2 in MPEC 2013-H49 -- 2013 GR38, 2013 FY13
E89Geyserland Obs. in New Zealand, 3 in MPEC 2013-H49 -- 96189, 285263, 1036
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2013-H49 -- 7888
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 2 in MPEC 2013-H49 -- 2013 GR38, 2009 SQ104
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-H49 -- 2013 GK69
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2013-H49 -- 53435, 3691
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2013-H49 -- 2013 GT38, 2013 GL8, 2013 BO76, 2011 BN24, 153349, 137126
718Wiggins Obs. in Utah, 1 in MPEC 2013-H49 -- 2013 GR38
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 April '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 1953 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 GG69JPL Sentry23592030-204735.1e-09-4.83-4.870JPL: "Analysis based on 32 observations spanning 10.924 days (2013-Apr-10.43133 to 2013-Apr-21.35503)." Diameter approximately 0.610 km. from mean, weighted H=18.7.
2013 GA55JPL Sentry23592070-2113211.2e-05-6.50-7.190JPL: "Analysis based on 14 observations spanning 1.7271 days (2013-Apr-09.44557 to 2013-Apr-11.17271)." Diameter approximately 0.010 km. from mean, weighted H=27.7.
2013 GW38JPL Sentry23592061-2113136.4e-06-7.07-7.610JPL: "Analysis based on 18 observations spanning 1.3411 days (2013-Apr-09.45225 to 2013-Apr-10.79339)." Diameter approximately 0.007 km. from mean, weighted H=28.5.
2013 GM3JPL Sentry23592028-21131741.5e-04-4.62-5.490JPL: "Analysis based on 62 observations spanning 9.9806 days (2013-Apr-03.32112 to 2013-Apr-13.30177)." Diameter approximately 0.019 km. from mean, weighted H=26.2.
2013 FU13JPL Sentry23592081-209852.1e-04-5.04-5.110JPL: "Analysis based on 21 observations spanning 17.219 days (2013-Mar-24.34961 to 2013-Apr-10.568711)." Diameter approximately 0.012 km. from mean, weighted H=27.2.
2013 ED28JPL Sentry2359203613.2e-07-4.18-4.180JPL: "Analysis based on 41 observations spanning 21.868 days (2013-Mar-07.21735 to 2013-Mar-29.085141)." Diameter approximately 0.170 km. from mean, weighted H=21.4.
2012 YR1JPL Sentry2359207717.4e-07-7.09-7.090JPL: "Analysis based on 30 observations spanning 23.330 days (2012-Dec-20.20945 to 2013-Jan-12.53922)." Diameter approximately 0.017 km. from mean, weighted H=26.5.
2012 WR10JPL Sentry23592087-211225.7e-07-8.36-8.420JPL: "Analysis based on 45 observations spanning 26.156 days (2012-Nov-22.21759 to 2012-Dec-18.37324)." Diameter approximately 0.007 km. from mean, weighted H=28.5.

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 29 April '13

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

2359Noted that JPL Sentry has updated its 2012 WR10 risk assessment - see above
Noted that JPL Sentry has updated its 2012 YR1 risk assessment - see above
Noted that JPL Sentry has updated its 2013 ED28 risk assessment - see above
Noted that JPL Sentry has updated its 2013 FU13 risk assessment - see above
Noted that JPL Sentry has updated its 2013 GA55 risk assessment - see above
Noted that JPL Sentry has updated its 2013 GG69 risk assessment - see above
Noted that JPL Sentry has updated its 2013 GM3 risk assessment - see above
Noted that JPL Sentry has updated its 2013 GW38 risk assessment - see above
Noted Radar Astrometry database update - see above
1433Generated Traffic Report
1430Grabbed MPEC 2013-H49 - Daily Orbit Update - see above
0218Noted that the NEOCP has become active