Contents  on 13 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 13 April '12

No objects reported inside ten LD

There are no objects reported moving inside ten lunar distances (LD) of our planet today. Next up, 2007 HV4 is calculated to arrive inside ten LD tomorrow (passage uncertainty +/- 1.748 days), newly discovered 2012 GP1 on April 17th, and 1992 JD on April 30th (uncertainty 4.600 hours).

This report was generated at 1557 UTC with follow-up for departed 2012 DA14 in today's DOU MPEC.

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 13 April '12

The MPC's NEO Confirmation Page has 30 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 30 objects listed. Of these, 20 were "one nighters." So far The Tracking News has counted a total of 47 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 13 April '12

Minor Planet Electronic Circulars

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

MPEC 2012-G38 - "17:58 UT" - 2012 GD2

MPEC 2012-G37 - "17:35 UT" - 2012 GC2

MPEC 2012-G36 - "16:32 UT" - Comet P/2011 FR143 (Lemmon)

<< DOU on 13 Apr. '12 >>  MPEC 2012-G35 - "06:03 UT" - Daily Orbit Update

MPEC 2012-G34 - "03:10 UT" - 2003 GH21

MPEC 2012-G33 - "00:47 UT" - 2001 QG142

MPEC 2012-G32 - "00:25 UT" - 2009 XG8

Observers  on 13 April '12

A total of 25 observers appear in today's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 1 in MPEC 2012-G38 -- 2012 GD2
E23Arcadia Obs. in New South Wales, 1 in MPEC 2012-G37 -- 2012 GC2
H21Astronomical Research Obs. Westfield in Illinois, 19 in MPECs 2012-G34, 2012-G35, 2012-G36 & 2012-G38 -- 2012 GK, 2012 GD2, 2012 FZ44, 2012 FZ23, 2012 FY23, 2012 FR1, 2012 FP52, 2012 FN52, 2012 FJ, 2012 EZ11, 2012 EU14, 2012 EO5, 2012 EM8, 2012 EA2, 2012 DL31, 2012 DA14, 2011 QD48, P/2011 FR143, 2003 GH21
300Bisei Spaceguard Center in Japan, 1 in MPEC 2012-G38 -- 2012 GD2
I77CEAMIG-REA in Brazil, 1 in MPEC 2012-G37 -- 2012 GC2
703Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2012-G35, 2012-G36, 2012-G37 & 2012-G38 -- 2012 GD2, 2012 GC2, P/2011 FR143, 212546, 154658
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPEC 2012-G35 -- 2012 FE58, 2012 DX32, 2012 DW30, 2011 YU62
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2012-G35 -- 2012 ES14
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2012-G37 -- 2012 GC2
F657Paul Roche in Wales via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-G36 -- P/2011 FR143
J95Great Shefford Obs. in England, 5 in MPECs 2012-G32, 2012-G33, 2012-G34, 2012-G37 & 2012-G38 -- 2012 GD2, 2012 GC2, 2009 XG8, 2003 GH21, 2001 QG142
G92Jarnac Obs. in Arizona, 1 in MPEC 2012-G36 -- P/2011 FR143
695{Tomas Vorobjov in England via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2012-G36 -- P/2011 FR143
704LINEAR in New Mexico, 7 in MPECs 2012-G35 & 2012-G36 -- 2012 FJ, P/2011 FR143, 96744, 85839, 36183, 317643, 141018
844Los Molinos Obs. in Uruguay, 1 in MPEC 2012-G38 -- 2012 GD2
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2012-G35 & 2012-G36 -- P/2011 FR143, 190208
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2012-G34, 2012-G35 & 2012-G36 -- P/2011 FR143, 2003 GH21, 66407, 234341
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-G36 -- P/2011 FR143
204Schiaparelli Obs. in Italy, 2 in MPECs 2012-G34 & 2012-G36 -- P/2011 FR143, 2003 GH21
E12Siding Spring Survey (SSS) in New South Wales, 6 in MPECs 2012-G35, 2012-G37 & 2012-G38 -- 2012 GD2, 2012 GC2, 68348, 189008, 152754, 3554
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2012-G36 -- P/2011 FR143
291Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2012-G34 & 2012-G35 -- 2012 GG1, 2012 FS62, 2012 FP62, 2012 FO62, 2012 FM52, 2012 FG58, 2011 UY255, 2010 HQ80, 2008 XP2, 2003 GH21
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2012-G34, 2012-G37 & 2012-G38 -- 2012 GD2, 2012 GC2, 2003 GH21
926Tenagra II Obs. in Arizona, 1 in MPEC 2012-G34 -- 2003 GH21
B42Vitebsk Obs. in Belarus, 2 in MPECs 2012-G37 & 2012-G38 -- 2012 GD2, 2012 GC2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 April '12

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
2012 GKNEODyS1556R E M O V E D-
2012 DA14JPL Sentry15562020-2057882.0e-04-3.26-3.870JPL: "Analysis based on 171 observations spanning 49.199 days (2012-Feb-23.03431 to 2012-Apr-12.233472)." Diameter approximately 0.045 km. from mean, weighted H=24.4.
NEODyS15562020-20902813.75e-04-3.10-3.680NEODyS: "Based on 174 optical observations (of which 4 are rejected as outliers) from 2012-02-23.029 to 2012-04-12.234."

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 13 April '12

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

1807Grabbed MPEC 2012-G37 - 2012 GC2 - see above
Grabbed MPEC 2012-G38 - 2012 GD2 - see above
1713Grabbed MPEC 2012-G36 - Comet P/2011 FR143 (Lemmon) - see above
1557Generated Traffic Report
1556Noted that JPL Sentry has updated its 2012 DA14 risk assessment - see above
Noted that NEODyS has updated its 2012 DA14 risk assessment - see above
Noted that NEODyS has removed 2012 GK as an impact risk - see above
Grabbed MPEC 2012-G35 - Daily Orbit Update - see above
0511Grabbed MPEC 2012-G34 - 2003 GH21 - see above
0215Grabbed MPEC 2012-G33 - 2001 QG142 - see above
0037Grabbed MPEC 2012-G32 - 2009 XG8 - see above