Contents  on 22 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 22 April '12

Seven objects reported inside ten LD

Seven objects are reported flying within ten lunar distances (LD) of our planet today. Risk-listed 2012 HG2 exits Earth's Hill sphere, traveling from 3.39 to 4.13 LD. Further away, 2012 HE comes its closest to Earth on this passage, reaching 6.90 LD at 1342 UTC. 2012 HN1 is outbound from 5.25 to 5.52 LD, radar target 2012 HM from 9.31 to 7.90 LD, and radar target 2012 GP1 from 8.99 to 9.15 LD. Unobserved 2007 HV4 may be moving from 7.4 to 9.1 LD (Earth passage uncertainty = +/- 1.748 days). And 2012 HE2 comes inside ten LD, traveling from 10.68 to 9.50 LD.

Headed our way next, 2012 HQ arrives inside ten LD tomorrow and 1992 JD on April 30th.

This report was generated at 1714 UTC with follow-up in today's DOU MPEC for 2012 HG2, 2012 HE2, 2012 HQ, 2012 HN, 2012 HM, 2012 HE, 2012 GP1, and distant 2007 HA.


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 22 April '12

The MPC's NEO Confirmation Page has 18 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eighteen objects listed. Of these, ten were "one nighters." So far The Tracking News has counted a total of 35 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 22 April '12

Minor Planet Electronic Circulars

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


MPEC 2012-H54 - "19:32 UT" - 2009 SC229


MPEC 2012-H53 - "19:27 UT" - 2009 KJ22


MPEC 2012-H52 - "13:08 UT" - 2012 HO8


MPEC 2012-H51 - "13:06 UT" - 2012 HN8


MPEC 2012-H50 - "13:04 UT" - 2012 HM8


MPEC 2012-H49 - "13:02 UT" - 2012 HL8


MPEC 2012-H48 - "13:00 UT" - 2012 HK8


MPEC 2012-H47 - "12:58 UT" - 2012 HJ8


MPEC 2012-H46 - "12:56 UT" - 2012 HH8


MPEC 2012-H45 - "12:54 UT" - 2012 HG8


<< DOU on 22 Apr. '12 >>  MPEC 2012-H44 - "06:03 UT" - Daily Orbit Update

Observers  on 22 April '12

A total of 35 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2012-H45 -- 2012 HG8
C77Bernezzo Obs. in Italy, 1 in MPEC 2012-H44 -- 2012 FY23
B88Bigmuskie Obs. in Italy, 3 in MPEC 2012-H44 -- 2012 HN2, 2012 HM, 2011 QD48
I99Blanquita Obs. in Spain, 2 in MPEC 2012-H44 -- 2012 HM, 1994 NK
493Calar Alto Obs. in Spain, 1 in MPEC 2012-H44 -- 2012 HM
703Catalina Sky Survey (CSS) in Arizona, 14 in MPECs 2012-H44, 2012-H45, 2012-H46, 2012-H48 & 2012-H51 -- 2012 HN8, 2012 HK8, 2012 HJ1, 2012 HH8, 2012 HG8, 2012 HG2, 2012 ES14, 2011 QD48, 2007 HA, 2004 FF29, 318050, 312473, 263976, 10636
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPECs 2012-H44 & 2012-H45 -- 2012 HQ, 2012 HL, 2012 HJ1, 2012 HG8, 2012 HE2, 2012 HE, 2012 FR62
G58Chabot Obs. in northern California, 6 in MPECs 2012-H44, 2012-H48 & 2012-H50 -- 2012 HW1, 2012 HN, 2012 HM8, 2012 HK8, 2012 GS5, 2012 FC71
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2012-H45 -- 2012 HG8
448Desert Moon Obs. in New Mexico, 2 in MPEC 2012-H44 -- 275558, 186822
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 2 in MPECs 2012-H45 & 2012-H46 -- 2012 HH8, 2012 HG8
I48El Catalejo Obs., 1 in MPEC 2012-H45 -- 2012 HG8
F657Paul Roche in Wales via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-H44 -- 1998 OK1
C73Galati Obs. in Romania, 2 in MPEC 2012-H44 -- 2012 HM, 2012 HG2
203GiaGa Obs. in Italy, 1 in MPEC 2012-H46 -- 2012 HH8
651Grasslands Obs. in Arizona, 2 in MPECs 2012-H45 & 2012-H46 -- 2012 HH8, 2012 HG8
J95Great Shefford Obs. in England, 8 in MPECs 2012-H44, 2012-H45, 2012-H46, 2012-H47, 2012-H48, 2012-H50, 2012-H51 & 2012-H52 -- 2012 HO8, 2012 HN8, 2012 HM8, 2012 HK8, 2012 HJ8, 2012 HH8, 2012 HG8, 2012 HG2
704LINEAR in New Mexico, 6 in MPEC 2012-H44 -- 2012 HL, 86667, 312473, 5587, 4055, 1620
H01Magdalena Ridge Obs. (MRO) in New Mexico, 10 in MPECs 2012-H44, 2012-H45, 2012-H46, 2012-H47, 2012-H48, 2012-H49, 2012-H50, 2012-H51 & 2012-H52 -- 2012 HR2, 2012 HQ2, 2012 HO8, 2012 HN8, 2012 HM8, 2012 HL8, 2012 HK8, 2012 HJ8, 2012 HH8, 2012 HG8
474Mt. John Obs. in New Zealand, 5 in MPECs 2012-H45, 2012-H48, 2012-H52, 2012-H53 & 2012-H54 -- 2012 HO8, 2012 HK8, 2012 HG8, 2009 SC229, 2009 KJ22
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2012-H44, 2012-H49, 2012-H51 & 2012-H52 -- 2012 HO8, 2012 HN8, 2012 HL8, 2012 FS62, 2012 DF61, 2002 GQ5, 31210, 152754, 5587
J93Mt. Tuffley Obs. in England, 3 in MPEC 2012-H44 -- 86667, 141018, 433
A24New Millennium Obs. in Italy, 17 in MPECs 2012-H44 & 2012-H46 -- 2012 HM, 2012 HK, 2012 HH8, 2012 GC2, 2012 ES14, 2012 DO, 322775, 318050, 317643, 306595, 263976, 24475, 154555, 141018, 6455, 3352, 3103
I50P2 Obs. in New Mexico, 1 in MPEC 2012-H44 -- 2012 HM
F51Pan-STARRS 1 (PS1) in Hawaii, 12 in MPECs 2012-H44, 2012-H47 & 2012-H50 -- 2012 HM8, 2012 HJ8, 2010 LJ14, 2007 UB6, 2006 VY13, 2004 FF29, 2003 HB6, 85628, 66407, 10636, 9162, 3352
H06_program code "_" (29) via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-H44 -- 141018
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-H44 -- 2011 UL21
461SZTE Asteroid Program in Hungary, 2 in MPECs 2012-H46 & 2012-H48 -- 2012 HK8, 2012 HH8
854Sabino Canyon Obs. in Arizona, 2 in MPECs 2012-H48 & 2012-H52 -- 2012 HO8, 2012 HK8
H36Sandlot Obs. in Kansas, 7 in MPECs 2012-H44, 2012-H45, 2012-H46, 2012-H47, 2012-H48 & 2012-H50 -- 2012 HM8, 2012 HK8, 2012 HJ8, 2012 HH8, 2012 HG8, 2012 CA21, 101955
204Schiaparelli Obs. in Italy, 2 in MPECs 2012-H45 & 2012-H46 -- 2012 HH8, 2012 HG8
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-H45 -- 2012 HG8
J84South Obs. in England, 2 in MPEC 2012-H44 -- 2012 HM, 2012 GC2
691Spacewatch 0.9m telescope in Arizona, 5 in MPEC 2012-H44 -- 2007 UB6, 2006 VY13, 2004 VB, 2004 FF29, 85628
291Spacewatch 1.8m telescope in Arizona, 9 in MPEC 2012-H44 -- 2012 HM1, 2012 GX11, 2012 GV17, 2012 GP1, 2012 GA12, 2012 FO62, 2010 MR87, 2008 PH9, 142348
C92Valdicerro Obs. in Italy, 1 in MPEC 2012-H46 -- 2012 HH8
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 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 HM8JPL Sentry16082032-2106291.0e-06-5.68-6.280JPL: "Analysis based on 16 observations spanning .84891 days (2012-Apr-21.43466 to 2012-Apr-22.28357)." Diameter approximately 0.054 km. from mean, weighted H=24.0.
2012 HL8JPL Sentry16082050-209785.2e-09-7.66-8.200JPL: "Analysis based on 11 observations spanning 1.1039 days (2012-Apr-21.36244 to 2012-Apr-22.46633)." Diameter approximately 0.069 km. from mean, weighted H=23.5.
2012 HG8JPL Sentry16082022-2066271.5e-06-2.58-3.010JPL: "Analysis based on 71 observations spanning 2.1091 days (2012-Apr-20.25484 to 2012-Apr-22.36394)." Diameter approximately 0.389 km. from mean, weighted H=19.7.
2012 HG2JPL Sentry16082048-206082.6e-05-5.72-6.100JPL: "Analysis based on 66 observations spanning 1.7597 days (2012-Apr-20.37147 to 2012-Apr-22.13117)." Diameter approximately 0.014 km. from mean, weighted H=26.9.
NEODyS16082053-20903281.22e-03-4.14-4.840NEODyS: "Based on 66 optical observations (of which 3 are rejected as outliers) from 2012-04-20.372 to 2012-04-22.132."
2012 GV17JPL Sentry16082033-2110711.5e-06-3.85-4.200JPL: "Analysis based on 20 observations spanning 6.8995 days (2012-Apr-14.34248 to 2012-Apr-21.24196)." Diameter approximately 0.206 km. from mean, weighted H=21.1.
NEODyS16082033-2089361.17e-06-3.94-4.290NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2012-04-14.343 to 2012-04-21.243."

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 22 April '12

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

2019Grabbed MPEC 2012-H53 - 2009 KJ22 - see above
Grabbed MPEC 2012-H54 - 2009 SC229 - see above
1714Generated Traffic Report
1608Noted that JPL Sentry has updated its 2012 GV17 risk assessment - see above
Noted that NEODyS has updated its 2012 GV17 risk assessment - see above
Noted that JPL Sentry has updated its 2012 HG2 risk assessment - see above
Noted that NEODyS has posted 2012 HG2 as an impact risk - see above
Noted that JPL Sentry has posted 2012 HG8 as an impact risk - see above
Noted that JPL Sentry has posted 2012 HL8 as an impact risk - see above
Noted that JPL Sentry has posted 2012 HM8 as an impact risk - see above
Grabbed MPEC 2012-H44 - Daily Orbit Update - see above
Grabbed MPEC 2012-H45 - 2012 HG8 - see above
Grabbed MPEC 2012-H46 - 2012 HH8 - see above
Grabbed MPEC 2012-H47 - 2012 HJ8 - see above
Grabbed MPEC 2012-H48 - 2012 HK8 - see above
Grabbed MPEC 2012-H49 - 2012 HL8 - see above
Grabbed MPEC 2012-H50 - 2012 HM8 - see above
Grabbed MPEC 2012-H51 - 2012 HN8 - see above
Grabbed MPEC 2012-H52 - 2012 HO8 - see above