Contents  on 5 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 5 April '13

No objects reported inside ten LD

No objects are reported to be within ten lunar distances (LD) of Earth today. Approaching our neighborhood next, risk-listed 2010 GM23 is calculated with major uncertainty to arrive inside ten LD on April 10th.

This report was generated at 1423 UTC with observation in today's DOU MPEC of distant 2003 FY6 and 68216 2001 CV26, and also of 2012 OQ from last July.

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 5 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 2217 UTC when the database was dated 5 April

NEOCP Activity  on 5 April '13

The MPC's NEO Confirmation Page has 13 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had thirteen objects listed. Of these, eight were "one nighters." So far The Tracking News has counted a total of 24 listings on the NEOCP today.

New MPECs  on 5 April '13

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2013-G18 - "13:50 UT" - 2011 BH10

MPEC 2013-G17 - "13:42 UT" - 2013 GO3

MPEC 2013-G16 - "13:39 UT" - 2013 GN3

MPEC 2013-G15 - "13:34 UT" - 2013 GM3

<< DOU on 5 Apr. '13 >>  MPEC 2013-G14 - "06:02 UT" - Daily Orbit Update

Observers  on 5 April '13

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2001 TA2
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2013-G15 -- 2013 GM3
300Bisei Spaceguard Center in Japan, 3 in MPEC 2013-G14 -- 2013 EV108, 2013 EO126, 2003 FY6
703Catalina Sky Survey (CSS) in Arizona, 13 in MPEC 2013-G14 -- 2013 FX13, 2013 EL28, 2013 EA, 2009 SC15, 2002 TY68, 2002 GS, 68216, 54686, 152952, 136993, 7480, 6047, 1864
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPECs 2013-G16 & 2013-G17 -- 2013 GO3, 2013 GN3
448Desert Moon Obs. in New Mexico, 6 in MPEC 2013-G14 -- 2013 FQ10, 2013 EV89, 2012 VO6, 2006 HU30, 54401, 141670
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2013-G14 -- 2013 FQ10
F658David Tholen's team in Hawaii via Faulkes Telescope North in Hawaii, 3 in MPEC 2013-G14 -- 2013 FZ7, 2013 EO126, 99942
J95Great Shefford Obs. in England, 2 in MPECs 2013-G15 & 2013-G16 -- 2013 GN3, 2013 GM3
W87LCOGT Cerro Tololo C in Chile, 1 in MPEC 2013-G15 -- 2013 GM3
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2013-G16 -- 2013 GN3
560Madonna di Dossobuono Obs. in Italy, 1 in MPEC 2013-G14 -- 2009 UM3
711McDonald Obs. in Texas, 1 in MPEC 2013-G18 -- 2011 BH10
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2013-G14, 2013-G15, 2013-G16 & 2013-G17 -- 2013 GO3, 2013 GN3, 2013 GM3, 719
I41Palomar Transient Factory (PTF) in southern California, 2 in MPEC 2013-G14 -- 99935, 5645
F51Pan-STARRS 1 (PS1) in Hawaii, 10 in MPECs 2013-G14, 2013-G15 & 2013-G18 -- 2013 GM3, 2012 SD22, 2011 BH10, 90075, 66008, 277810, 274855, 210012, 141874, 137199
W71Rand II Obs., 1 in MPEC 2013-G14 -- 2012 OQ
H36Sandlot Obs. in Kansas, 3 in MPECs 2013-G16, 2013-G17 & 2013-G18 -- 2013 GO3, 2013 GN3, 2011 BH10
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2013-G14 -- 2013 GJ, 2013 FY13
691Spacewatch 0.9m telescope in Arizona, 3 in MPECs 2013-G14 & 2013-G18 -- 2013 FX13, 2011 BH10, 1862
718Wiggins Obs. in Utah, 1 in MPEC 2013-G14 -- 2013 EV108
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 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 EC20NEODyS14202087-209036.53e-07-8.54-8.630NEODyS: "Based on 59 optical observations (of which 0 are rejected as outliers) from 2013-03-07.217 to 2013-03-13.563."
JPL Sentry0140207712.6e-08-9.86-9.860JPL: "Analysis based on 1 radar Doppler and 62 optical observations spanning 12.285 days (2013-Mar-01.28024 to 2013-Mar-13.565278)." Diameter approximately 0.005 km. from mean, weighted H=29.0.

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 5 April '13

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

2217Noted Radar Astrometry database update - see above
1423Generated Traffic Report
1420Noted that NEODyS has reposted 2013 EC20 as an impact risk - see above
Grabbed MPEC 2013-G14 - Daily Orbit Update - see above
Grabbed MPEC 2013-G15 - 2013 GM3 - see above
Grabbed MPEC 2013-G16 - 2013 GN3 - see above
Grabbed MPEC 2013-G17 - 2013 GO3 - see above
Grabbed MPEC 2013-G18 - 2011 BH10 - see above
0140Noted that JPL Sentry has reposted 2013 EC20 as an impact risk - see above