New Horizons spacecraft, now halfway to Pluto, 
courtesy of the New Horizons mission.

The New Horizons mission reported yesterday that "Sunday, Oct. 17, at 3:24 Universal Time, we passed the halfway mark in the number of days from launch to Pluto encounter," which will be in July 2015. Upcoming team activities include using large telescopes to seach for Kuiper Belt objects near the path of the spacecraft, which might also encounter Nepune Trojans. Image credit: NASA New Horizons.

Contents  on 19 October '10


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.

NEOCP Activity  on 19 October '10

The MPC's NEO Confirmation Page has 9 listings: 1 new, 8 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and eight updated listings. Of these, four were "one nighters." So far The Tracking News has counted a total of thirteen listings on the NEOCP at some point 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 19 October '10

Minor Planet Electronic Circulars

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

MPEC 2010-U23 - "20:20 UT" - 2006 OS9

MPEC 2010-U22 - "15:34 UT" - 2010 UM

<< DOU on 19 Oct. '10 >>  MPEC 2010-U21 - "06:09 UT" - Daily Orbit Update

MPEC 2010-U20 - "02:20 UT" - Editorial Notice

Observers  on 19 October '10

Thirteen observing facilities appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPECs 2010-U21 & 2010-U22 -- 2010 UM, 2010 UD, 2010 UC, 2010 TY54, 2010 TU149, 2010 TS55, 2010 TN54, 2010 TK19, 2010 TK167, 2010 TJ7, 2010 TH54, 2010 TH19, 2010 TC55, 2010 SS16, 2010 SK15, 2010 RP80, 2010 GP67
B75Betelgeuse Station in Italy, 1 in MPEC 2010-U21 -- 2003 UV11
703Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2010-U21 -- 2004 FU4, 3200
H26Doc Greiner Research Obs. in Wisconsin, 1 in MPEC 2010-U21 -- 2010 UD
203GiaGa Obs. in Italy, 6 in MPEC 2010-U21 -- 2010 UD, 2010 TG19, 2010 TC55, 2010 RN80, 2007 RU17, 2005 TB15
J37Huelva Obs. in Spain, 2 in MPEC 2010-U21 -- 2007 RU17, 2000 TU28
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 3 in MPEC 2010-U21 -- 248083, 242147, 6455
474Mt. John Obs. in New Zealand, 1 in MPEC 2010-U21 -- 2007 CN26
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2010-U21 & 2010-U22 -- 2010 UM, 2010 GP67
H36Sandlot Obs. in Kansas, 1 in MPEC 2010-U21 -- 2010 TM3
E12Siding Spring Survey in New South Wales, 1 in MPEC 2010-U23 -- 2006 OS9
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2010-U21 -- 2010 TZ54
A48Verona Obs. in Italy, 2 in MPEC 2010-U21 -- 2010 UD, 2007 RU17
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 October '10

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 CLOMON (backup) risk pages.





Notes for Today's Latest Risk Assessments
2010 UKNEODyS15042068-2090261.37e-03-3.95-3.960NEODyS: "Based on 55 optical observations (of which 2 are rejected as outliers) from 2010/10/17.497 to 2010/10/18.347."
2010 UJNEODyS15042019-2090992.81e-05-4.93-5.890NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2010/10/17.452 to 2010/10/18.466."
2010 UHNEODyS15042029-20901737.98e-05-5.35-5.540NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2010/10/17.420 to 2010/10/18.486."
2010 TK167JPL Sentry1504R E M O V E DJPL: Risk listing removed at 0949 UTC.
2010 TU149JPL Sentry15042077-209838.9e-08-4.51-4.650JPL: "Analysis based on 46 observations spanning 4.8916 days (2010-Oct-13.37823 to 2010-Oct-18.269828)." Diameter approximately 0.300 km. from mean, weighted H=20.3.

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 19 October '10

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

2038Grabbed MPEC 2010-U23 - 2006 OS9 - see above
1602Grabbed MPEC 2010-U22 - 2010 UM - see above
1504Noted that JPL Sentry has removed 2010 TK167 as an impact risk - see above
Noted that JPL Sentry has updated its 2010 TU149 risk assessment - see above
Noted that NEODyS has posted 2010 UH as an impact risk - see above
Noted that NEODyS has posted 2010 UJ as an impact risk - see above
Noted that NEODyS has posted 2010 UK as an impact risk - see above
Grabbed MPEC 2010-U21 - Daily Orbit Update - see above
0411Grabbed MPEC 2010-U20 - Editorial Notice - see above