Contents  on 25 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 25 April '12

Seven objects reported inside ten LD

There are seven asteroids reported inside ten lunar distances (LD) of Earth today. Radar target 2012 HM enters Earth's Hill sphere, passing from 5.11 to 3.76 LD. Further out, risk-listed 2012 HP13 is inbound from 6.86 to 4.18 LD. Risk-listed 2012 HG2 is outbound from 5.66 to 6.43 LD, 2012 HN1 from 6.71 to 7.52 LD, 2012 HE from 8.51 to 9.85 LD, and 2012 HE2 from 9.10 to 9.97 LD, and radar target 2012 GP1 departs from inside ten LD, moving from 9.78 to 10.24 LD.

Approaching our neighborhood next, 1992 JD arrives inside ten LD on April 30th and 2010 KK37 on May 15th.

This report was generated at 1616 UTC with follow-up in today's DOU MPEC for 2012 HP13, 2012 HG2, and 2012 HM.


Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Earth's Hill sphere (of gravitational influence) is estimated to extend out to around 3.89 LD. 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 25 April '12

The MPC's NEO Confirmation Page has 29 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 29 objects listed. Of these, fifteen were "one nighters." So far The Tracking News has counted a total of 42 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 25 April '12

Minor Planet Electronic Circulars

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


MPEC 2012-H70 - "18:09 UT" - 2010 NR1


MPEC 2012-H69 - "16:36 UT" - 2004 RQ252


MPEC 2012-H68 - "16:27 UT" - 2012 GN12 = 2010 FY28 = 2011 GP61


MPEC 2012-H67 - "15:34 UT" - 2010 FH92


MPEC 2012-H66 - "11:04 UT" - 2012 HS15


MPEC 2012-H65 - "11:02 UT" - 2012 HR15


<< DOU on 25 Apr. '12 >>  MPEC 2012-H64 - "06:03 UT" - Daily Orbit Update


MPEC 2012-H63 - "00:36 UT" - 2012 HP15


MPEC 2012-H62 - "00:33 UT" - 2012 HO15

Observers  on 25 April '12

A total of 26 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2012-H69 -- 2004 RQ252
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPECs 2012-H62, 2012-H63, 2012-H64, 2012-H65, 2012-H67 & 2012-H70 -- 2012 HR2, 2012 HR15, 2012 HP15, 2012 HO15, 2012 HO1, 2012 HM8, 2012 HB2, 2012 FZ44, 2010 NR1, 2010 FH92, 1994 XD
703Catalina Sky Survey (CSS) in Arizona, 8 in MPECs 2012-H63, 2012-H64 & 2012-H65 -- 2012 HR15, 2012 HP15, 2012 FY23, 2011 YV15, 68346, 322775, 189008, 5324
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2012-H64 -- 2001 SZ269
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 4 in MPEC 2012-H64 -- 2012 HP13, 2012 HM, 2012 HL, 141018
F651UKAPP in Northern Ireland via Faulkes Telescope North in Hawaii, 2 in MPEC 2012-H64 -- 2012 EM8, 2012 EC
F657Paul Roche in Wales via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-H67 -- 2010 FH92
E106program code 6 via Faulkes Telescope South in New South Wales, 2 in MPEC 2012-H64 -- 2012 FA14, 2012 EC
C73Galati Obs. in Romania, 4 in MPEC 2012-H64 -- 2012 ES14, 85275, 318050, 154555
J95Great Shefford Obs. in England, 1 in MPEC 2012-H62 -- 2012 HO15
704LINEAR in New Mexico, 4 in MPEC 2012-H64 -- 2012 HL, 2001 SZ269, 141531, 9400
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 1 in MPEC 2012-H64 -- 2008 AF32
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2012-H62 -- 2012 HO15
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2012-H64 -- 2012 HG8, 2012 HG2
568}program code "}" (33) on Mauna Kea in Hawaii, 2 in MPEC 2012-H64 -- 2012 GK, 2012 FM52
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2012-H64, 2012-H65 & 2012-H66 -- 2012 HS15, 2012 HR15, 2012 HM, 2001 SZ269, 24445
A24New Millennium Obs. in Italy, 5 in MPEC 2012-H64 -- 2012 FY23, 1994 NK, 85275, 40263, 302830
F51Pan-STARRS 1 (PS1) in Hawaii, 14 in MPECs 2012-H62 & 2012-H64 -- 2012 HO15, 2012 HN13, 2012 BK11, 2012 AA11, 2011 MB2, 2007 UB6, 2006 VY13, 2004 FF29, 2003 SK5, 2002 GK8, 66407, 153951, 152754, 9162
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 11 in MPEC 2012-H64 -- 2012 HP13, 2012 HM, 2012 HL, 2012 HJ1, 2012 HG8, 2012 HG2, 2012 DO, 2012 AA11, 2004 FF29, 1998 HE3, 1994 NK
H068program code 8 via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-H64 -- 101955
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2012-H62 -- 2012 HO15
H36Sandlot Obs. in Kansas, 8 in MPECs 2012-H62, 2012-H63, 2012-H64 & 2012-H65 -- 2012 HR15, 2012 HP15, 2012 HO8, 2012 HO15, 2012 HN8, 2012 HM8, 2012 HG2, 2012 HB2
204Schiaparelli Obs. in Italy, 1 in MPEC 2012-H62 -- 2012 HO15
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-H69 -- 2004 RQ252
J84South Obs. in England, 2 in MPEC 2012-H64 -- 2012 HP13, 2012 HM
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2012-H64 -- 2012 HQ2, 2008 HW1, 302830
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2012-H62, 2012-H63, 2012-H64 & 2012-H66 -- 2012 HS15, 2012 HP15, 2012 HO15, 2012 HO13, 2012 HL8, 2012 HJ8, 2012 HG8, 2012 GV11, 2010 KX7
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2012-H62 & 2012-H64 -- 2012 HO15, 2012 HM
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 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 HP13JPL Sentry16142058-2100224.8e-05-3.94-3.990JPL: "Analysis based on 49 observations spanning 2.6884 days (2012-Apr-22.46032 to 2012-Apr-25.14874)." Diameter approximately 0.047 km. from mean, weighted H=24.3.
NEODyS16142059-2090202.14e-05-4.29-4.320NEODyS: "Based on 49 optical observations (of which 0 are rejected as outliers) from 2012-04-22.461 to 2012-04-25.150."
2012 HM8JPL Sentry16142084-210531.3e-06-5.68-5.720JPL: "Analysis based on 28 observations spanning 2.8321 days (2012-Apr-21.43466 to 2012-Apr-24.266763)." Diameter approximately 0.057 km. from mean, weighted H=23.9.
2012 HL8JPL Sentry1614207922.8e-08-6.90-7.170JPL: "Analysis based on 16 observations spanning 3.0065 days (2012-Apr-21.36244 to 2012-Apr-24.36898)." Diameter approximately 0.071 km. from mean, weighted H=23.4.
2012 HG8JPL Sentry16142027-206262.5e-06-2.35-2.360JPL: "Analysis based on 113 observations spanning 4.8969 days (2012-Apr-20.25484 to 2012-Apr-25.1517)." Diameter approximately 0.370 km. from mean, weighted H=19.8.
NEODyS16142027-203039.58e-07-2.75-2.750NEODyS: "Based on 114 optical observations (of which 1 are rejected as outliers) from 2012-04-20.256 to 2012-04-25.152."
2012 HG2JPL Sentry16142053-205758.3e-05-5.21-5.630JPL: "Analysis based on 112 observations spanning 3.9970 days (2012-Apr-20.37147 to 2012-Apr-24.36845)." Diameter approximately 0.014 km. from mean, weighted H=27.0.
NEODyS16142053-20912651.09e-03-4.17-5.030NEODyS: "Based on 112 optical observations (of which 9 are rejected as outliers) from 2012-04-20.372 to 2012-04-24.369."

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 25 April '12

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

1833Grabbed MPEC 2012-H68 - 2012 GN12 = 2010 FY28 = 2011 GP61 - see above
Grabbed MPEC 2012-H70 - 2010 NR1 - see above
1813Grabbed MPEC 2012-H69 - 2004 RQ252 - see above
1616Generated Traffic Report
1614Noted that JPL Sentry has updated its 2012 HG2 risk assessment - see above
Noted that NEODyS has updated its 2012 HG2 risk assessment - see above
Noted that JPL Sentry has updated its 2012 HG8 risk assessment - see above
Noted that NEODyS has updated its 2012 HG8 risk assessment - see above
Noted that JPL Sentry has updated its 2012 HL8 risk assessment - see above
Noted that JPL Sentry has updated its 2012 HM8 risk assessment - see above
Noted that JPL Sentry has updated its 2012 HP13 risk assessment - see above
Noted that NEODyS has updated its 2012 HP13 risk assessment - see above
Grabbed MPEC 2012-H64 - Daily Orbit Update - see above
Grabbed MPEC 2012-H65 - 2012 HR15 - see above
Grabbed MPEC 2012-H66 - 2012 HS15 - see above
Grabbed MPEC 2012-H67 - 2010 FH92 - see above
0145Grabbed MPEC 2012-H63 - 2012 HP15 - see above
0037Grabbed MPEC 2012-H62 - 2012 HO15 - see above