Contents  on 24 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 24 April '13

One object reported inside ten LD

There is one object reported to be within a radius of ten lunar distances (LD) from Earth today. 2013 GH66 is outbound from 5.80 to 6.14 LD. No other objects are known to be approaching our ten-LD neighborhood until late July.

This report was generated at 1519 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 24 April '13

The MPC's NEO Confirmation Page has 4 listings

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

<< DOU on 24 Apr. '13 >>  MPEC 2013-H42 - "06:03 UT" - Daily Orbit Update

MPEC 2013-H41 - "00:57 UT" - 2013 HV14

Observers  on 24 April '13

Thirteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2013-H41 & 2013-H42 -- 2013 HV14, 2013 GF, 2013 DR9
309$program code "$" (13) via Cerro Paranal in Chile, 3 in MPEC 2013-H42 -- 341050, 230979, 11398
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPECs 2013-H41 & 2013-H42 -- 2013 HV14, 2013 GA80
448Desert Moon Obs. in New Mexico, 1 in MPEC 2013-H42 -- 2013 GF
006Fabra Obs. in Spain, 1 in MPEC 2013-H42 -- 7888
J95Great Shefford Obs. in England, 2 in MPECs 2013-H41 & 2013-H42 -- 2013 HV14, 2013 GK69
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2013-H42 -- 2013 GM3
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2013-H41 -- 2013 HV14
711McDonald Obs. in Texas, 1 in MPEC 2013-H41 -- 2013 HV14
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2013-H42 -- 2013 HQ11
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPECs 2013-H41 & 2013-H42 -- 2013 HV14, 2013 HO11, 2011 WU95, 185853, 163249, 161998, 143637
E12Siding Spring Survey in New South Wales, 1 in MPEC 2013-H42 -- 2013 HU14
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2013-H42 -- 2013 HQ11
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 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 HT14NEODyS00002071-207731.22e-06-6.36-6.490NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2013-04-21.260 to 2013-04-23.276."
2013 GM3JPL Sentry15162028-21131681.8e-04-4.51-5.090JPL: "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.
NEODyS15162028-20901158.53e-05-4.81-5.530NEODyS: "Based on 62 optical observations (of which 2 are rejected as outliers) from 2013-04-03.322 to 2013-04-13.303."

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 24 April '13

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

1519Generated Traffic Report
1516Noted that JPL Sentry has updated its 2013 GM3 risk assessment - see above
Noted that NEODyS has updated its 2013 GM3 risk assessment - see above
Grabbed MPEC 2013-H42 - Daily Orbit Update - see above
0408Grabbed MPEC 2013-H41 - 2013 HV14 - see above