Contents  on 22 July '12

Note: The A/CC news pages will update less often and at irregular intervals through early July 25th.

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 July '12

One object reported inside ten LD

There is one visitor reported passing within ten lunar distances (LD) of Earth today. 2012 OQ comes inside ten LD, traveling from 10.84 to 9.10 LD. No other objects are known to be coming so close until November.

This report was generated at 1636 UTC with follow-up in today's DOU MPEC for 2012 OQ.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. 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 July '12

The MPC's NEO Confirmation Page has 6 listings

When last checked at 2338 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had six objects listed. Of these, one was a "one nighter." So far The Tracking News has counted a total of ten 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 July '12

Minor Planet Electronic Circulars

As of last check at 2338 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2012-O24 - "17:38 UT" - 2012 OE1

MPEC 2012-O23 - "16:53 UT" - 2011 SR5

<< DOU on 22 July '12 >>  MPEC 2012-O22 - "06:02 UT" - Daily Orbit Update

Observers  on 22 July '12

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPECs 2012-O22 & 2012-O24 -- 2012 OO, 2012 OE1, 2012 NQ, 2012 NP, 2012 NO, 2012 NN, 2012 MU2, 2012 MM11, 2012 MK6, 2012 LU7, 2012 LE11, 2012 KC6, 2012 HL, 2012 HG31, 2012 FZ23, 2012 DU30, 2005 NX44
160Castelmartini Obs. in Italy, 2 in MPEC 2012-O22 -- 2012 OQ, 2012 OO
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2012-O22 -- 2012 NQ
176Consell Obs. in Spain, 1 in MPEC 2012-O24 -- 2012 OE1
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPEC 2012-O22 -- 2012 NQ, 2012 KC6
114Engelhardt Obs. Zelenchukskaya Station in Karachay-Cherkessia, 1 in MPEC 2012-O24 -- 2012 OE1
719Etscorn Obs. in New Mexico, 1 in MPEC 2012-O22 -- 5836
J95Great Shefford Obs. in England, 4 in MPECs 2012-O22 & 2012-O24 -- 2012 OQ, 2012 OO, 2012 OE1, 2012 NN
704LINEAR in New Mexico, 3 in MPEC 2012-O22 -- 37655, 154007, 5143
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-O23 -- 2011 SR5
711McDonald Obs. in Texas, 1 in MPEC 2012-O24 -- 2012 OE1
474Mt. John Obs. in New Zealand, 1 in MPEC 2012-O24 -- 2012 OE1
C27Pallerols Obs. in Spain, 2 in MPEC 2012-O22 -- 2012 OQ, 154007
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-O24 -- 2012 OE1
204Schiaparelli Obs. in Italy, 7 in MPEC 2012-O22 -- 2012 OB1, 2012 ML6, 2012 ME7, 2012 MA7, 2012 LT7, 2006 BZ7, 52381
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2012-O22 -- 214869, 162011
J84South Obs. in England, 2 in MPEC 2012-O22 -- 2012 OQ, 153958
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2012-O24 -- 2012 OE1
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2012-O24 -- 2012 OE1
B18Terskol Obs. in Russia, 1 in MPEC 2012-O24 -- 2012 OE1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 July '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2338 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
2011 SR5JPL Sentry1909R E M O V E DJPL: Risk listing removed at 1908 UTC.

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 July '12

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

1909Noted that JPL Sentry has removed 2011 SR5 as an impact risk - see above
1800Grabbed MPEC 2012-O23 - 2011 SR5 - see above
Grabbed MPEC 2012-O24 - 2012 OE1 - see above
1636Generated Traffic Report
1634Grabbed MPEC 2012-O22 - Daily Orbit Update - see above