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Contents  on 8 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.

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Traffic Report  on 8 April '12

Four objects reported inside ten LD

There are four asteroids reported inside ten lunar distances (LD) of Earth today. Risk-listed 2012 GD comes inside ten LD, moving from 10.68 to 9.85 LD. 2012 FA57 is outbound from 6.48 to 8.52 LD. And intruder 2012 FS35 departs from inside ten LD, traveling from 9.54 to 10.31 LD, as does 2012 FH58, passing from 9.68 to 11.73 LD.

Coming toward Earth next, returning 2007 HV4 arrives inside ten LD on April 14th.

This report was posted at 1651 UTC with follow-up from late March in today's DOU MPEC for 2012 FS52, 2012 FW35, 2012 FT35, and 2012 EG5.

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.

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NEOCP Activity  on 8 April '12

The MPC's NEO Confirmation Page has 2 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two objects listed.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

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New MPECs  on 8 April '12

Minor Planet Electronic Circulars

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


<< DOU on 8 Apr. '12 >>  MPEC 2012-G25 - "06:01 UT" - Daily Orbit Update

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Observers  on 8 April '12

Ten observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 27 in MPEC 2012-G25 -- 2012 GK, 2012 FZ23, 2012 FY23, 2012 FR35, 2012 FQ35, 2012 FO52, 2012 FO35, 2012 FN52, 2012 FJ, 2012 FG58, 2012 FB57, 2012 EM8, 2012 EL5, 2012 EA2, 2012 DU30, 2012 DO8, 2012 DO, 2012 DG31, 2012 CC17, 2012 AU10, 2012 AA11, 2011 QD48, 2008 UK90, 2004 QJ7, 2003 HB6, 29075, 3360
I99Blanquita Obs. in Spain, 1 in MPEC 2012-G25 -- 2011 QD48
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPEC 2012-G25 -- 2012 FZ44, 2011 XO3, 2011 PW6, 2010 LJ14, 2009 UW18, 2009 KJ, 2008 WZ13, 2008 EP6, 2002 JQ9, 2000 GS146, 1998 VN
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 3 in MPEC 2012-G25 -- 2012 FZ23, 2012 FH38, 2011 SY120
719Etscorn Obs. in New Mexico, 2 in MPEC 2012-G25 -- 3288, 1036
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2012-G25 -- 2010 LR33
J38La Vara Obs. in Spain, 1 in MPEC 2012-G25 -- 2012 EG5
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2012-G25 -- 319988
H23Pear Tree Obs. in Florida, 1 in MPEC 2012-G25 -- 2012 EG5
204Schiaparelli Obs. in Italy, 8 in MPEC 2012-G25 -- 2012 FZ23, 2012 FW35, 2012 FT35, 2012 FS52, 2012 FR35, 2012 FO35, 2012 DX32, 322966
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

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Impact Risk Monitoring  on 8 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.
0000NNN000

Object
Risk
Monitor		When
Noted
UTC		0000T0000
Year
Range
VI
#		000NN00
Prob
Cum		T0000
PS
Cum		T0000
PS
Max
T
S

Notes for Today's Latest Risk Assessments
2012 GKJPL Sentry1649R E M O V E DJPL: Risk listing removed at 0856 UTC.

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.

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Chronology  on 8 April '12

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

1651Generated Traffic Report
1649Noted that JPL Sentry has removed 2012 GK as an impact risk - see above
Grabbed MPEC 2012-G25 - Daily Orbit Update - see above