Contents  on 18 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 18 May '12

Three objects reported inside ten LD

Three objects are reported passing within ten lunar distances (LD) of our planet today. Intruder 2012 KA is leaving the Earth-Moon system, traveling from 0.96 to 4.04 LD. Returning 2010 KK37 (still unobservable) is calculated to enter Earth's Hill sphere, moving from 4.2 to 2.5 LD, but with an Earth approach uncertainty +/- 1.160 days. Out further, 2012 KW is inbound from 9.40 to 7.31 LD.

Approaching our neighborhood next, 2012 JV11 arrives inside ten LD on May 20th, following which no objects are known to be coming inside ten LD until November.

This report was generated at 1626 UTC with follow-up in today's DOU MPEC for 2012 KW, 2012 KA, 2012 JV11, and departed 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 18 May '12

The MPC's NEO Confirmation Page has 27 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 27 objects listed. Of these, 22 were "one nighters." So far The Tracking News has counted a total of 41 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 18 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-K17 - "22:58 UT" - 2012 KO1

MPEC 2012-K16 - "12:32 UT" - 2012 JT17

<< DOU on 18 May '12 >>  MPEC 2012-K15 - "06:03 UT" - Daily Orbit Update

Observers  on 18 May '12

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPECs 2012-K15, 2012-K16 & 2012-K17 -- 2012 KO1, 2012 JT17, 2012 JN4, 2012 JB16, 2012 HN8, 2012 HK31, 2012 HJ1, 2012 HG8, 2012 EM8, 2012 AN23, 2011 QD48, 2008 XP2, 2004 LE, 2003 WO7, 2002 FT6
703Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2012-K15 -- 312473, 244670, 163732, 143651
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPECs 2012-K15 & 2012-K16 -- 2012 JW11, 2012 JV11, 2012 JT17, 2012 JQ4, 2012 JQ, 2012 JN4, 2012 JM4, 2012 HC34, 2005 MB
448Desert Moon Obs. in New Mexico, 2 in MPEC 2012-K15 -- 2012 HO15, 152754
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 2 in MPEC 2012-K15 -- 2012 KX, 2012 JV11
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 2 in MPEC 2012-K15 -- 2012 KW, 2001 CQ36
E107program code 7 via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-K16 -- 2012 JT17
704LINEAR in New Mexico, 5 in MPEC 2012-K15 -- 2012 HG31, 2012 DO, 53110, 162082, 141018
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2012-K16 & 2012-K17 -- 2012 KO1, 2012 JT17
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-K15 -- 2012 EY11
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2012-K15, 2012-K16 & 2012-K17 -- 2012 KO1, 2012 JU4, 2012 JT17, 2012 HH31, 2012 HB34, 2003 HP32, 322763, 154229, 10302
A24New Millennium Obs. in Italy, 13 in MPEC 2012-K15 -- 2012 HZ33, 2009 XG8, 2002 JC9, 86667, 85275, 322775, 318050, 24475, 154555, 154144, 141018, 7889, 3352
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPEC 2012-K15 -- 2012 HN2, 2012 HG31, 2010 EW45, 258325, 162082, 5836
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-K15 -- 2012 JH11
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-K15 -- 2012 KA
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2012-K15 -- 2012 HY33
291Spacewatch 1.8m telescope in Arizona, 11 in MPECs 2012-K15, 2012-K16 & 2012-K17 -- 2012 KO1, 2012 JT17, 2012 HG31, 2012 HG2, 2011 YE6, 2010 EW45, 2009 VA26, 2009 MS, 2003 BQ35, 2002 JE9, 2000 RD53
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2012-K16 -- 2012 JT17
C36Starry Wanderer Obs., 1 in MPEC 2012-K15 -- 2011 WV134
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2012-K15 -- 2012 JX11, 2012 HN40, 162980
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 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 HG2JPL Sentry16182053-205682.1e-05-5.79-5.970JPL: "Analysis based on 169 observations spanning 26.967 days (2012-Apr-20.37147 to 2012-May-17.33831)." Diameter approximately 0.014 km. from mean, weighted H=27.0.
NEODyS16182053-20902261.11e-03-4.17-4.880NEODyS: "Based on 166 optical observations (of which 9 are rejected as outliers) from 2012-04-20.372 to 2012-05-17.339."

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 18 May '12

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

2359Grabbed MPEC 2012-K17 - 2012 KO1 - see above
1626Generated Traffic Report
1618Noted 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-K15 - Daily Orbit Update - see above
Grabbed MPEC 2012-K16 - 2012 JT17 - see above