Contents  on 2 May '12

Note: These A/CC news pages will update infrequently through Thursday, May 3rd, possibly less than daily.

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 2 May '12

Four objects reported inside ten LD

Four objects are reported inside ten lunar distances (LD) of Earth today. Within Earth's Hill sphere, 2012 HA34 comes its closest to Earth this time around, reaching 2.87 LD at 1104 UTC. Further away, risk-listed 2012 HE31 is outbound from 4.74 to 6.80 LD and radar target 2012 HM from 5.33 to 6.73 LD. And 1992 JD, which so far has not been reported observed, is calculated to come its closest to Earth on this passage -- 9.5 LD at 0450 UTC, with an uncertainty of +/- 4.60 hours.

Approaching our neighborhood next, 2010 KK37 arrives inside ten LD on May 15th.

This report was generated at 1819 UTC with follow-up in today's DOU MPEC for 2012 HG2.

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 2 May '12

The MPC's NEO Confirmation Page has 1 listing

When last checked at 2357 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one object listed. This was a "one nighter." So far The Tracking News has counted a total of six 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 2 May '12

Minor Planet Electronic Circulars

As of last check at 2357 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2012-J11 - "15:52 UT" - Comet C/2012 H2 (McNaught)

MPEC 2012-J10 - "15:09 UT" - 2011 HB53

MPEC 2012-J09 - "11:16 UT" - 2012 JA

MPEC 2012-J08 - "11:14 UT" - 2012 HC34

MPEC 2012-J07 - "11:12 UT" - 2012 HB34

<< DOU on 2 May '12 >>  MPEC 2012-J06 - "06:04 UT" - Daily Orbit Update

Observers  on 2 May '12

Fifteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPECs 2012-J06, 2012-J07 & 2012-J08 -- 2012 HZ33, 2012 HS15, 2012 HR15, 2012 HP15, 2012 HO15, 2012 HN2, 2012 HH8, 2012 HG8, 2012 HC34, 2012 HB34, 2012 GB5
703Catalina Sky Survey in Arizona, 1 in MPEC 2012-J06 -- 1627
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 18 in MPECs 2012-J06, 2012-J07, 2012-J08 & 2012-J11 -- 2012 HQ2, 2012 HL31, 2012 HK31, 2012 HG2, 2012 HC34, 2012 HC20, 2012 HB34, C/2012 H2, 2012 FP62, 2012 FG58, 2012 DX75, 2010 EW45, 2009 UW18, 2004 JA, 2003 HB6, 66272, 162082, 3360
I48El Catalejo Obs., 1 in MPEC 2012-J11 -- C/2012 H2
I19El Gato Gris Obs. in Argentina, 1 in MPEC 2012-J11 -- C/2012 H2
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-J09 -- 2012 JA
704LINEAR in New Mexico, 3 in MPEC 2012-J06 -- 2003 WH166, 1998 HE3, 137925
H01Magdalena Ridge Obs. (MRO) in New Mexico, 5 in MPECs 2012-J06, 2012-J07, 2012-J08 & 2012-J09 -- 2012 JA, 2012 HG2, 2012 HC34, 2012 HB34, 2010 EW45
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-J10 -- 2011 HB53
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2012-J06, 2012-J07, 2012-J08 & 2012-J09 -- 2012 JA, 2012 HK31, 2012 HC34, 2012 HB34, 2012 FE58, 2010 EW45, 2004 VB, 141531
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPEC 2012-J06 -- 2012 FM52, 2007 UB6, 1998 HE3, 85628, 312473
E12Siding Spring Survey (SSS) in New South Wales, 21 in MPECs 2012-J06 & 2012-J11 -- C/2012 H2, 2012 GC2, 2012 FP62, 2011 UU106, 89830, 86039, 68548, 318411, 208565, 20460, 16960, 162421, 144411, 141056, 101955, 100926, 5604, 3554, 3122, 2201, 1685
J84South Obs. in England, 3 in MPEC 2012-J06 -- 2012 HM8, 2012 HL, 2002 JC9
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2012-J06 -- 2004 FF29, 2003 HB6, 186822
291Spacewatch 1.8m telescope in Arizona, 23 in MPECs 2012-J06, 2012-J07, 2012-J08 & 2012-J09 -- 2012 JA, 2012 HY33, 2012 HO13, 2012 HN13, 2012 HM1, 2012 HJ8, 2012 HD20, 2012 HC34, 2012 HB34, 2012 HB25, 2012 HA2, 2012 GX11, 2012 GV11, 2012 GS5, 2012 GK, 2012 FS62, 2010 OD101, 2010 LR33, 2010 KX7, 2010 FQ, 2009 NH, 2008 HW1, 2008 EY68
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 May '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2357 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 HB25JPL Sentry18102016-2090122.5e-05-3.98-4.120JPL: "Analysis based on 22 observations spanning 6.9102 days (2012-Apr-24.35308 to 2012-May-01.26323)." Diameter approximately 0.038 km. from mean, weighted H=24.8.
NEODyS18092016-2090122.79e-05-3.93-4.020NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2012-04-24.354 to 2012-05-01.264."
2012 HG8JPL Sentry1810203011.8e-09-5.48-5.480JPL: "Analysis based on 148 observations spanning 10.980 days (2012-Apr-20.25484 to 2012-May-01.234534)." Diameter approximately 0.370 km. from mean, weighted H=19.8.
2012 HG2JPL Sentry18102053-2061241.3e-04-5.04-5.770JPL: "Analysis based on 140 observations spanning 11.080 days (2012-Apr-20.37147 to 2012-May-01.4516)." Diameter approximately 0.014 km. from mean, weighted H=27.0.
NEODyS18102053-20912531.05e-03-4.20-4.930NEODyS: "Based on 140 optical observations (of which 9 are rejected as outliers) from 2012-04-20.372 to 2012-05-01.452."

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 2 May '12

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

1819Generated Traffic Report
1810Noted that JPL Sentry has updated its 2012 HB25 risk assessment - see above
Noted 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
1809Noted that NEODyS has updated its 2012 HB25 risk assessment - see above
Grabbed MPEC 2012-J06 - Daily Orbit Update - see above
Grabbed MPEC 2012-J07 - 2012 HB34 - see above
Grabbed MPEC 2012-J08 - 2012 HC34 - see above
Grabbed MPEC 2012-J09 - 2012 JA - see above
Grabbed MPEC 2012-J10 - 2011 HB53 - see above
Grabbed MPEC 2012-J11 - Comet C/2012 H2 (McNaught) - see above