Contents  on 12 May '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 12 May '12

One object reported inside ten LD

One object is reported inside ten lunar distances (LD) of Earth today. Newly announced intruder 2012 JU enters Earth's Hill sphere, moving from 4.67 to 1.74 LD, headed for passage 0.53 LD from Earth at 1319 UT tomorrow.

Coming our way next, returning 2010 KK37 is calculated to arrive inside ten LD on May 15th, with an Earth approach uncertainty of +/- 1.160 days. After that, no objects are known to be approaching the ten-LD "bubble" until November.

This report was updated at 2301 UTC with new discovery 2012 JU (MPEC) and, earlier, follow-up in today's DOU MPEC for 2012 HG2. Today's first traffic report was generated at 1724 UTC.

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 12 May '12

The MPC's NEO Confirmation Page has 10 listings

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

Minor Planet Electronic Circulars

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

MPEC 2012-J35 - "21:11 UT" - 2012 JU

MPEC 2012-J34 - "21:01 UT" - 2012 HN40

<< DOU on 12 May '12 >>  MPEC 2012-J33 - "06:02 UT" - Daily Orbit Update

Observers  on 12 May '12

Eighteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 19 in MPEC 2012-J33 -- 2012 HZ33, 2012 HW1, 2012 HR15, 2012 HO, 2012 HN8, 2012 HG8, 2012 HD20, 2012 GS5, 2012 FR62, 2012 FN52, 2012 FJ, 2012 FE58, 2012 DV32, 2012 DN14, 2012 DH61, 2012 CA21, 2012 BD27, 2012 AU10, 2011 QD48
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2012-J34 & 2012-J35 -- 2012 JU, 2012 HN40
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPEC 2012-J33 -- 2012 HC34, 2012 HB25, 2012 BZ76, 2008 EJ1
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 2 in MPEC 2012-J33 -- 2012 HJ1, 141018
C73Galati Obs. in Romania, 4 in MPECs 2012-J33 & 2012-J34 -- 2012 HZ33, 2012 HN40, 2002 JC9, 141018
J95Great Shefford Obs. in England, 1 in MPEC 2012-J33 -- 2012 JQ
379Hamamatsu-Yuto Obs. in Japan, 4 in MPEC 2012-J33 -- 2011 WV134, 2006 VY13, 141018, 5836
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-J33 -- 2012 EC
932McCarthy Obs. in Connecticut, 1 in MPEC 2012-J33 -- 2011 WV134
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2012-J33 -- 2011 UU106
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2012-J33 & 2012-J34 -- 2012 HN40, 68359, 153958
204Schiaparelli Obs. in Italy, 1 in MPEC 2012-J35 -- 2012 JU
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2012-J34 & 2012-J35 -- 2012 JU, 2012 HN40
J84South Obs. in England, 1 in MPEC 2012-J33 -- 2012 HL
291Spacewatch 1.8m telescope in Arizona, 16 in MPEC 2012-J33 -- 2012 HY33, 2012 HY1, 2012 HP15, 2012 HM1, 2012 HL8, 2012 HG31, 2012 HG2, 2012 HF31, 2012 HD20, 2012 GX11, 2012 GV11, 2012 GT5, 2012 FS62, 2012 FO62, 2010 EW45, 2008 UG7
A98Taurus-1 Obs. in Belarus, 1 in MPEC 2012-J33 -- 2011 WV134
C92Valdicerro Obs. in Italy, 1 in MPEC 2012-J33 -- 2012 JQ
I15Wishing Star Obs. in Rhode Island, 1 in MPEC 2012-J33 -- 24475
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 May '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.





Notes for Today's Latest Risk Assessments
2012 HB25JPL Sentry1723206211.8e-08-7.79-7.790JPL: "Analysis based on 33 observations spanning 16.904 days (2012-Apr-24.35308 to 2012-May-11.25743)." Diameter approximately 0.035 km. from mean, weighted H=24.9.
NEODyS1723R E M O V E D-
2012 HG2JPL Sentry17232053-2060221.1e-04-5.08-5.770JPL: "Analysis based on 155 observations spanning 20.969 days (2012-Apr-20.37147 to 2012-May-11.34049)." Diameter approximately 0.014 km. from mean, weighted H=27.0.
NEODyS17232053-20902561.11e-03-4.16-4.90NEODyS: "Based on 152 optical observations (of which 9 are rejected as outliers) from 2012-04-20.372 to 2012-05-11.341."

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 12 May '12

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

2301Updated Traffic Report
2207Grabbed MPEC 2012-J34 - 2012 HN40 - see above
Grabbed MPEC 2012-J35 - 2012 JU - see above
1723Noted that JPL Sentry has updated its 2012 HB25 risk assessment - see above
Noted that NEODyS has removed 2012 HB25 as an impact risk - 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
Grabbed MPEC 2012-J33 - Daily Orbit Update - see above