Contents  on 7 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 7 April '13

No objects reported inside ten LD

No objects are reported to be visiting within ten lunar distances (LD) of our planet today. Coming our way next, risk-listed 2010 GM23, which has not been reported recovered yet on this passage, is calculated with major uncertainty to arrive inside ten LD on April 10th.

This report was generated at 1539 UTC with follow-up in today's DOU MPEC for departed radar target 2013 FK (adding 4.872 days to what had been a 6.976-day observing arc) and observation of distant 68216 2001 CV26.

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 7 April '13

The MPC's NEO Confirmation Page has 31 listings

When last checked at 2201 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 31 objects listed. Of these, 23 were "one nighters." So far The Tracking News has counted a total of 55 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 7 April '13

Minor Planet Electronic Circulars

As of last check at 2201 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2013-G24 - "20:58 UT" - 2013 GM8

MPEC 2013-G23 - "20:54 UT" - 2013 GL8

<< DOU on 7 Apr. '13 >>  MPEC 2013-G22 - "06:03 UT" - Daily Orbit Update

Observers  on 7 April '13

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 18 in MPECs 2013-G22 & 2013-G23 -- 2013 GL8, 2013 GG, 2013 GF, 2013 FX13, 2013 EW27, 2013 EV108, 2013 EL28, 2013 EC68, 2013 DU, 2013 CP35, 2012 YQ3, 2012 XY6, 2012 TO231, 2011 MB2, 2011 BH10, 2008 VN, 2007 HF44, 2004 JQ1
703Catalina Sky Survey (CSS) in Arizona, 8 in MPEC 2013-G22 -- 2013 EO126, 2013 EA, 2007 CN26, 2002 JW15, 66253, 163696, 139289, 3199
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPECs 2013-G22 & 2013-G24 -- 2013 GN3, 2013 GM8, 2013 GJ, 2013 GH, 2013 FZ7, 2013 FK, 2013 FC8, 2012 XO111, 2011 KD11, 2004 GD28, 2002 TR190
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2013-G22 -- 2013 EO126
448Desert Moon Obs. in New Mexico, 3 in MPEC 2013-G22 -- 2013 GF, 2013 ET9, 2011 WU95
006Fabra Obs. in Spain, 1 in MPEC 2013-G22 -- 99942
F659Marco Micheli in Hawaii via Faulkes Telescope North in Hawaii, 1 in MPEC 2013-G22 -- 2013 GY7
J95Great Shefford Obs. in England, 1 in MPEC 2013-G22 -- 2013 GM3
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2013-G22 -- 359592
W87LCOGT Cerro Tololo C in Chile, 1 in MPEC 2013-G22 -- 2013 GM3
844Los Molinos Obs. in Uruguay, 3 in MPEC 2013-G22 -- 285263, 242450, 1036
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2013-G24 -- 2013 GM8
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-G23 -- 2013 GL8
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2013-G22 -- 2013 GZ7
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2013-G22 & 2013-G24 -- 2013 GM8, 2012 QC8, 4179, 1917
J93Mt. Tuffley Obs. in England, 3 in MPEC 2013-G22 -- 68216, 5645, 1036
I41Palomar Transient Factory in southern California, 1 in MPEC 2013-G22 -- 2013 GZ7
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPECs 2013-G22 & 2013-G23 -- 2013 GL8, 2013 FA8, 2007 CN26, 2001 YT3, 210012, 19764, 11284, 10145, 1917
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2013-G22 -- 2013 GJ, 2013 FY13
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2013-G22 & 2013-G23 -- 2013 GL8, 2013 BO76, 2011 GQ61
I76Tesla Obs. in Spain, 3 in MPEC 2013-G22 -- 2013 FY13, 2013 EV108, 2013 EO126
I42Westport Obs. in Massachusetts, 4 in MPEC 2013-G22 -- 2013 EV108, 2013 ET9, 2013 EO126, 2013 EL28
I15Wishing Star Obs. in Rhode Island, 1 in MPEC 2013-G22 -- 2013 FQ10
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 April '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2201 and JPL at 2019 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 GM3JPL Sentry15362026-21133932.5e-04-3.86-3.960JPL: "Analysis based on 31 observations spanning 3.5768 days (2013-Apr-03.32112 to 2013-Apr-06.89797)." Diameter approximately 0.021 km. from mean, weighted H=26.0.

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 7 April '13

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

2201Grabbed MPEC 2013-G23 - 2013 GL8 - see above
Grabbed MPEC 2013-G24 - 2013 GM8 - see above
1539Generated Traffic Report
1536Noted that JPL Sentry has updated its 2013 GM3 risk assessment - see above
Grabbed MPEC 2013-G22 - Daily Orbit Update - see above