Contents  on 24 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 24 May '12

Two objects reported inside ten LD

Two visitors are reported traveling inside ten lunar distances (LD) of Earth today. Within Earth's Hill sphere, 2012 KT12 is moving away from 1.46 to 1.79 LD. And 2012 KW is outbound from 5.91 to 7.87 LD.

Next up, newly announced 2012 KP24, a risk-listed intruder, is calculated with some uncertainty to arrive inside ten LD tomorrow, following which no other objects are known to approach this close until November.

This report was updated at 1825 UTC with new discovery 2012 KP24 (MPEC) and, earlier, follow-up in today's DOU MPEC for 2012 KT12. Today's first traffic report was generated at 1305 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 24 May '12

The MPC's NEO Confirmation Page has 15 listings

When last checked at 2314 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fifteen objects listed. Of these, eleven were "one nighters." So far The Tracking News has counted a total of 20 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 24 May '12

Minor Planet Electronic Circulars

As of last check at 2314 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2012-K52 - "16:24 UT" - 2012 KP24

<< DOU on 24 May '12 >>  MPEC 2012-K51 - "06:04 UT" - Daily Orbit Update

Observers  on 24 May '12

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPEC 2012-K51 -- 2012 KY3, 2012 KX, 2012 KT12, 2012 KD6, 2012 KC6, 2012 KA4, 2012 JX11, 2012 JT17, 2012 JS11, 2012 JH11, 2012 JB16, 2012 HW1, 2012 HO, 2012 HN8, 2012 HK
703Catalina Sky Survey in Arizona, 1 in MPEC 2012-K51 -- 2012 KX
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPEC 2012-K51 -- 2012 KN11, 2012 KL11, 2012 JQ, 2012 JM4, 2005 BC, 2004 MD, 2003 MT2, 2002 JQ9, 24761
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2012-K51 -- 2012 KD6
168Kourovskaya Obs. in Russia, 4 in MPEC 2012-K51 -- 86667, 312473, 141018, 137925
704LINEAR in New Mexico, 9 in MPEC 2012-K51 -- 2012 HN40, 2006 VY13, 1999 VP6, 326732, 322966, 297274, 162082, 141018, 6455
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2012-K51 -- 2012 CA55, 2007 NS4
474Mt. John Obs. in New Zealand, 5 in MPEC 2012-K51 -- 2012 KY3, 2012 JQ, 2012 JN4, 2012 HC34, 2012 HC20
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2012-K51 & 2012-K52 -- 2012 KP24, 2005 EY95, 186822, 141018
J69North Obs. in England, 1 in MPEC 2012-K51 -- 1994 NK
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2012-K51 -- 1999 VP6
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2012-K51 -- 2007 RT147
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 10 in MPEC 2012-K51 -- 2012 HN40, 2012 HJ1, 2012 HG31, 2012 GX11, 2011 WV134, 2007 LE, 1999 VP6, 1994 NK, 162082, 153958
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-K51 -- 2012 KK11
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2012-K51 -- 2004 RU331, 326732
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2012-K51 -- 2012 KJ11
C36Starry Wanderer Obs., 1 in MPEC 2012-K51 -- 2011 WV134
954Teide Obs. in the Canary Islands, 2 in MPEC 2012-K51 -- 2012 HN40, 2012 FE58
G56Walnut Creek Obs. in northern California, 2 in MPEC 2012-K51 -- 2012 KX, 2012 JB16
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 May '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2314 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 KP24JPL Sentry18022031-204952.6e-05-4.75-4.870JPL: "Analysis based on 12 observations spanning 1.0672 days (2012-May-23.33535 to 2012-May-24.40254)." Diameter approximately 0.021 km. from mean, weighted H=26.1.
2012 KN18NEODyS13022056-207141.37e-08-7.65-7.920NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2012-05-22.304 to 2012-05-23.285."
2012 KJ11JPL Sentry1302R E M O V E DJPL: Risk listing removed at 0854 UTC.
NEODyS1302R E M O V E D-
2012 JS11JPL Sentry1302206912.8e-10-7.05-7.050JPL: "Analysis based on 37 observations spanning 7.9124 days (2012-May-15.35926 to 2012-May-23.271697)." Diameter approximately 0.360 km. from mean, weighted H=19.9.

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 24 May '12

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

1825Updated Traffic Report
1802Noted that JPL Sentry has posted 2012 KP24 as an impact risk - see above
Grabbed MPEC 2012-K52 - 2012 KP24 - see above
1302Noted that JPL Sentry has updated its 2012 JS11 risk assessment - see above
Noted that JPL Sentry has removed 2012 KJ11 as an impact risk - see above
Noted that NEODyS has removed 2012 KJ11 as an impact risk - see above
Noted that NEODyS has posted 2012 KN18 as an impact risk - see above
Grabbed MPEC 2012-K51 - Daily Orbit Update - see above