Contents  on 16 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 16 April '12

Three objects reported inside ten LD

Three objects are reported passing inside ten lunar distances (LD) of our planet today. Newly discovered 2012 GW11 enters ten LD, passing from 11.46 to 8.14 LD, and 2012 GY11, also newly announced, is outbound from 9.32 to 9.85 LD. And 2007 HV4, which so far has not been reported observed on this return, may be inbound from 8.0 to 6.5 LD, but JPL's Earth passage calculation has an uncertainty of +/- 1.748 days.

Coming our way next, radar target 2012 GP1 arrives inside ten LD tomorrow and 1992 JD on April 30th (uncertainty +/- 4.600 hours).

This report was updated at 2141 UTC with new discoveries 2012 GY11 (MPEC) and 2012 GW11 (MPEC) and, earlier, follow-up in today's DOU MPEC for 2012 GP1 and, from late March, 2012 FH58 and 2012 FM35. Today's first traffic report was generated at 1514 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 16 April '12

The MPC's NEO Confirmation Page has 51 listings

When last checked at 2318 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 51 objects listed. Of these, 46 were "one nighters." So far The Tracking News has counted a total of 92 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 16 April '12

Minor Planet Electronic Circulars

As of last check at 2318 UTC, there have been eight MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2012-H08 - "21:38 UT" - 2012 GA12

MPEC 2012-H07 - "18:01 UT" - 2012 GY11

MPEC 2012-H06 - "17:59 UT" - 2012 GX11

MPEC 2012-H05 - "17:57 UT" - 2012 GW11

MPEC 2012-H04 - "17:55 UT" - 2012 GV11

MPEC 2012-H03 - "10:58 UT" - 2008 UG7

MPEC 2012-H02 - "10:17 UT" - 2008 HW1

<< DOU on 16 Apr. '12 >>  MPEC 2012-H01 - "06:03 UT" - Daily Orbit Update

Observers  on 16 April '12

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
703Catalina Sky Survey (CSS) in Arizona, 8 in MPECs 2012-H01, 2012-H03 & 2012-H07 -- 2012 GY11, 2012 FY23, 2012 EL5, 2008 UG7, 1998 HJ3, 86667, 312473, 9400
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPECs 2012-H02, 2012-H03, 2012-H04, 2012-H05, 2012-H06, 2012-H07 & 2012-H08 -- 2012 GY11, 2012 GX11, 2012 GW11, 2012 GV11, 2012 GA12, 2008 UG7, 2008 HW1
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2012-H01 -- 2012 FG58
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-H06 -- 2012 GX11
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-H08 -- 2012 GA12
J95Great Shefford Obs. in England, 5 in MPECs 2012-H01, 2012-H03, 2012-H04, 2012-H05 & 2012-H07 -- 2012 GY11, 2012 GW11, 2012 GV11, 2012 GE5, 2008 UG7
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-H01 -- 2012 GA5
F51Pan-STARRS 1 (PS1) in Hawaii, 16 in MPECs 2012-H01, 2012-H02, 2012-H05, 2012-H06 & 2012-H08 -- 2012 GX11, 2012 GW11, 2012 GP1, 2012 GA12, 2011 MB2, 2008 HW1, 2008 GG2, 2007 UB6, 2002 GK8, 2001 UW17, 86667, 10636, 100926, 3352, 3103, 1917
H23Pear Tree Obs. in Florida, 4 in MPEC 2012-H01 -- 2012 DO, 317643, 141018, 6455
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2012-H01 -- 2012 FY23, 2012 DO, 2012 AA11, 1994 NK
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2012-H01 -- 2012 FL35
854Sabino Canyon Obs. in Arizona, 3 in MPECs 2012-H03, 2012-H05 & 2012-H07 -- 2012 GY11, 2012 GW11, 2008 UG7
204Schiaparelli Obs. in Italy, 27 in MPEC 2012-H01 -- 2012 GK, 2012 FZ23, 2012 FY23, 2012 FT62, 2012 FR62, 2012 FM35, 2012 FH58, 2012 FG58, 2012 FD1, 2012 ES14, 2012 DX75, 2012 DU30, 2012 BC20, 2012 AA11, 2011 YV15, 2011 YU62, 2011 XO3, 2011 SL102, 2011 QD48, 2011 GB55, 2010 LR33, 2008 JZ30, 2008 GG2, 2004 QJ7, 2004 FG11, 2004 FF29, 1998 HJ3
E12Siding Spring Survey (SSS) in New South Wales, 7 in MPECs 2012-H01 & 2012-H07 -- 2012 GY11, 2012 FL35, 2012 FD23, 2012 DX75, 89830, 241370, 143947
J84South Obs. in England, 4 in MPEC 2012-H01 -- 2012 GD2, 2012 GC2, 2012 FY23, 2012 ES14
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2012-H04 -- 2012 GV11
291Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2012-H01, 2012-H04 & 2012-H06 -- 2012 GX11, 2012 GV11, 2012 FQ1, 2012 FA14, 2012 AN23, 2010 LR33
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2012-H05 -- 2012 GW11
926Tenagra II Obs. in Arizona, 2 in MPECs 2012-H05 & 2012-H06 -- 2012 GX11, 2012 GW11
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 April '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2318 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 GE5JPL Sentry1509R E M O V E DJPL: Risk listing removed at 0849 UTC.
NEODyS1509R E M O V E D-
2012 FQ1NEODyS1509R E M O V E D-
2010 WW8NEODyS1509R E M O V E D-
2010 DJ77NEODyS1509R E M O V E D-
2008 EJ68NEODyS1509R E M O V E D-
2003 YS70NEODyS15092081-208223.31e-07-8.75-8.790NEODyS: "Based on 78 optical observations (of which 7 are rejected as outliers) from 2003-12-22.201 to 2003-12-27.192."
2000 SZ162NEODyS15092078-207812.45e-07-8.09-8.090NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2000-09-29.320 to 2000-10-07.191."

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 16 April '12

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

2204Grabbed MPEC 2012-H08 - 2012 GA12 - see above
2141Updated Traffic Report
1838Grabbed MPEC 2012-H04 - 2012 GV11 - see above
Grabbed MPEC 2012-H05 - 2012 GW11 - see above
Grabbed MPEC 2012-H06 - 2012 GX11 - see above
Grabbed MPEC 2012-H07 - 2012 GY11 - see above
1509Noted that NEODyS has updated its 2000 SZ162 risk assessment - see above
Noted that NEODyS has updated its 2003 YS70 risk assessment - see above
Noted that NEODyS has removed 2008 EJ68 as an impact risk - see above
Noted that NEODyS has removed 2010 DJ77 as an impact risk - see above
Noted that NEODyS has removed 2010 WW8 as an impact risk - see above
Noted that NEODyS has removed 2012 FQ1 as an impact risk - see above
Noted that JPL Sentry has removed 2012 GE5 as an impact risk - see above
Noted that NEODyS has removed 2012 GE5 as an impact risk - see above
Grabbed MPEC 2012-H01 - Daily Orbit Update - see above
Grabbed MPEC 2012-H02 - 2008 HW1 - see above
Grabbed MPEC 2012-H03 - 2008 UG7 - see above