Contents  on 15 April '12

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 15 April '12

One object reported inside ten LD

One object may be inside ten lunar distances (LD) of our planet today. Returning 2007 HV4 is calculated to be moving from 9.7 to 8.0 LD, with an Earth passage uncertainty of +/- 1.748 days.

Next up, radar target 2012 GP1 arrives inside ten LD on April 17th and 1992 JD on April 30th (uncertainty +/- 4.600 hours).

This report was generated at 1625 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 15 April '12

The MPC's NEO Confirmation Page has 55 listings

When last checked at 2317 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 55 objects listed. Of these, 49 were "one nighters." So far The Tracking News has counted a total of 63 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 15 April '12

Minor Planet Electronic Circulars

As of last check at 2317 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 15 Apr. '12 >>  MPEC 2012-G48 - "06:03 UT" - Daily Orbit Update

Observers  on 15 April '12

Seven observers appear in today's MPEC.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 4 in MPEC 2012-G48 -- 2012 GD2, 2012 ES14, 317643, 6455
621Bergisch Gladbach Obs. in Germany, 1 in MPEC 2012-G48 -- 2010 OD101
246KLENOT in the Czech Republic, 1 in MPEC 2012-G48 -- 2006 FY35
704LINEAR in New Mexico, 1 in MPEC 2012-G48 -- 1620
F51Pan-STARRS 1 (PS1) in Hawaii, 15 in MPEC 2012-G48 -- 2012 GC2, 2012 DG31, 2011 YV15, 2011 SO32, 2010 LR33, 2005 CJ, 2002 WP, 2000 SJ344, 66407, 36183, 189008, 18109, 162422, 144861, 136874
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2012-G48 -- 2012 GC2
H47Vicksburg Obs. in Mississippi, 1 in MPEC 2012-G48 -- 2012 DO
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 April '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2318 and JPL at 2317 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
2012 GE5NEODyS16242049-204911.29e-07-7.47-7.470NEODyS: "Based on 6 optical observations (of which 0 are rejected as outliers) from 2012-04-12.359 to 2012-04-13.257."

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 15 April '12

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

1625Generated Traffic Report
1624Noted that NEODyS has posted 2012 GE5 as an impact risk - see above
Grabbed MPEC 2012-G48 - Daily Orbit Update - see above