Contents  on 30 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 30 April '13

One object reported inside ten LD

There is one asteroid reported to be within ten lunar distances (LD) of Earth today. 2013 GH66 is moving slowly away from 8.04 to 8.44 LD. No other objects are known to come within ten LD until late July.

This report was generated at 1522 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.

NEOCP Activity  on 30 April '13

The MPC's NEO Confirmation Page has 10 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had ten objects listed. Of these, four were "one nighters." So far The Tracking News has counted a total of twelve 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 30 April '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-H51 - "13:15 UT" - 2010 GB174

<< DOU on 30 Apr. '13 >>  MPEC 2013-H50 - "06:02 UT" - Daily Orbit Update

Observers  on 30 April '13

Fourteen observers appear in today's MPECs.

CodeObserver / observatory
160Castelmartini Obs. in Italy, 4 in MPEC 2013-H50 -- 2013 GE84, 2013 EO126, 354952, 206910
703Catalina Sky Survey (CSS) in Arizona, 8 in MPEC 2013-H50 -- 360433, 185853, 161998, 141495, 141447, 139289, 4179, 2329
448Desert Moon Obs. in New Mexico, 6 in MPEC 2013-H50 -- 2013 HT15, 2013 GV68, 2013 GE84, 2013 GC34, 2012 TV78, 2009 SQ104
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2013-H50 -- 2013 HP11
E89Geyserland Obs. in New Zealand, 2 in MPEC 2013-H50 -- 96189, 285263
304Las Campanas Obs. in Chile, 1 in MPEC 2013-H51 -- 2010 GB174
568:program code ":" on Mauna Kea in Hawaii, 1 in MPEC 2013-H51 -- 2010 GB174
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2013-H50 -- 137170, 136795
J93Mt. Tuffley Obs. in England, 1 in MPEC 2013-H50 -- 1036
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2013-H50 -- 357005
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2013-H50 -- 274855, 5645
461SZTE Asteroid Program in Hungary, 5 in MPEC 2013-H50 -- 2013 GZ79, 2013 GY68, 2013 GE84, 2013 FY13, 5645
E12Siding Spring Survey in New South Wales, 1 in MPEC 2013-H50 -- 2013 HT15
291Spacewatch 1.8m telescope in Arizona, 15 in MPEC 2013-H50 -- 2013 HV14, 2013 HP11, 2013 HM11, 2013 HL11, 2013 GY7, 2013 GV68, 2013 GU38, 2013 GS66, 2013 GR38, 2013 GQ38, 2013 GG69, 2013 CN222, 2013 CN128, 2010 LF14, 2009 HF88
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 April '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 GG69JPL Sentry1622R E M O V E DJPL: Risk listing removed at 1549 UTC.

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 30 April '13

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

1622Noted that JPL Sentry has removed 2013 GG69 as an impact risk - see above
1522Generated Traffic Report
1425Grabbed MPEC 2013-H50 - Daily Orbit Update - see above
Grabbed MPEC 2013-H51 - 2010 GB174 - see above