Ikaros solar sail fully deployed. 
(c)Copyright 2010 JAXA.

First noticed at Emily Lakdawalla's Planetary Society Blog yesterday is that Japan's space agency has posted images of successful solar sail deployment by its Ikaros spacecraft, which was launched last month into heliocentric orbit. The sail is 20 meters across diagonally and 0.0075mm thick. This is a technology test for a proposed mission to explore Jupiter Trojan asteroids. Image ©copyright 2010 JAXA.

Contents  on 17 June '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 17 June '10

The MPC's NEO Confirmation Page has 6 listings: 2 new, 4 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two new and four updated listings. Of these, three were "one nighters." So far The Tracking News has counted a total of nine 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 17 June '10

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2010-M13 - "12:11 UT" - 2010 MC

MPEC 2010-M12 - "12:00 UT" - 2010 MB

<< DOU on 17 June '10 >>  MPEC 2010-M11 - "06:11 UT" - Daily Orbit Update

Observers  on 17 June '10

A total of 20 observing facilities appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPECs 2010-M12 & 2010-M13 -- 2010 MC, 2010 MB
B09Capannoli Obs. in Italy, 5 in MPEC 2010-M11 -- 2010 EH20, 2009 KD5, 52750, 161998, 4055
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2010-M11 & 2010-M13 -- 2010 MC, 2010 LM34, 2009 KD5, 88263
448Desert Moon Obs. in New Mexico, 5 in MPEC 2010-M11 -- 2010 JF88, 2010 CL18, 2006 KL21, 2005 UK1, 2002 OS4
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 2 in MPEC 2010-M11 -- 2010 EV45, 2007 HA59
J95Great Shefford Obs. in England, 3 in MPECs 2010-M11, 2010-M12 & 2010-M13 -- 2010 MC, 2010 MB, 2010 LL34
379Hamamatsu-Yuto Obs. in Japan, 1 in MPEC 2010-M11 -- 2009 KD5
429Hawker Obs., 1 in MPEC 2010-M11 -- 2010 LY63
704LINEAR in New Mexico, 11 in MPEC 2010-M11 -- 2009 XC2, 2009 UV18, 2007 VG189, 2007 OG3, 2003 QB90, 1999 MN, 1998 XM2, 85628, 7350, 3551, 887
J75La Sagra Obs. in Spain, 1 in MPEC 2010-M11 -- 52750
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2010-M12 & 2010-M13 -- 2010 MC, 2010 MB
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2010-M11 -- 2010 HA104
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2010-M11 & 2010-M12 -- 2010 MB, 2010 KQ
J93Mt. Tuffley Obs. in England, 1 in MPEC 2010-M11 -- 1036
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 2 in MPEC 2010-M11 -- 2009 KD5, 2003 NZ6
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2010-M13 -- 2010 MC
H36Sandlot Obs. in Kansas, 2 in MPECs 2010-M12 & 2010-M13 -- 2010 MC, 2010 MB
291Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2010-M11, 2010-M12 & 2010-M13 -- 2010 MC, 2010 MB, 2010 LQ33, 2010 LJ61, 2010 LJ14, 2010 KP10, 2010 GW62, 2010 BH2, 2003 HB, 2001 BY15
926Tenagra II Obs. in Arizona, 4 in MPECs 2010-M11, 2010-M12 & 2010-M13 -- 2010 MC, 2010 MB, 2010 LK34, 2010 LE68
C51WISE in Earth polar orbit, 18 in MPEC 2010-M11 -- 2010 GX62, 2010 FQ, 2010 FB81, 2010 CH18, 2010 CG18, 2010 CA55, 2010 AG79, 2009 WZ104, 2009 WO6, 2009 WF104, 54789, 239849, 215442, 17188, 16064, 152671, 152564, 9202
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 June '10

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2358 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 LJ68NEODyS15092015-2089821.44e-07-5.60-6.370NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2010/06/11.741 to 2010/06/16.222."
2010 LL34JPL Sentry1509R E M O V E DJPL: Risk listing removed at 0955 UTC.
2010 DJ77JPL Sentry22142024-21071471.1e-06-6.99-7.940JPL: "Analysis based on 8 observations spanning .86030 days (2010-Feb-20.49966 to 2010-Feb-21.35996)." Diameter approximately 0.015 km. from mean, weighted H=26.8.
2009 TBJPL Sentry19072014-2091471.3e-05-6.26-6.960JPL: "Analysis based on 12 observations spanning .10702 days (2009-Oct-02.2061 to 2009-Oct-02.31312)." Diameter approximately 0.005 km. from mean, weighted H=29.2.

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 17 June '10

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

2214Noted that JPL Sentry has updated its 2010 DJ77 risk assessment - see above
1907Noted that JPL Sentry has posted 2009 TB as an impact risk - see above
1509Noted that NEODyS has posted 2010 LJ68 as an impact risk - see above
Noted that JPL Sentry has removed 2010 LL34 as an impact risk - see above
Grabbed MPEC 2010-M11 - Daily Orbit Update - see above
Grabbed MPEC 2010-M12 - 2010 MB - see above
Grabbed MPEC 2010-M13 - 2010 MC - see above