Contents on 18 June '11
- IAU Minor Planet Center
- Observers -- five observers
- Impact Risk Monitoring -- two objects
- Consolidated Risk Tables - the CRT page
Of 424 risk-listed objects, 348 have had news in the last 30 days. Updated at 1500 UTC on 18 June.
- Earth's Busy Neighborhood Traffic Report
Two objects are known to be within ten LD of Earth today. Updated at 1725 UTC on 18 June.
- Ephemerides for risk-rated and nearby objects
- News image catalog
- Old & new CRT Archive
- Old News Archive & Small Objects Archive
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 18 June '11
The MPC's NEO Confirmation Page has 2 listings
When last checked at 2314 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two objects listed. Both of these were "one nighters."
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 June '11
Minor Planet Electronic Circulars
As of last check at 2314 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- Observations of risk-listed objects
- K11L19C 2011 LC19 (Q=5.480 AU, arc=7 days, H=18.1 ~812m) from Astronomical Research Obs. Westfield (June 17.17-18p6)
- K11L17T 2011 LT17 (arc=7 days, H=21.7 ~155m) from New Millennium Obs. (June 13.94p2)
- Observations of recently (no longer) risk-listed objects
- K11L19A 2011 LA19 (Q=4.816 AU, arc=8 days, H=19.1 ~513m) from ARO Westfield (June 17.15-16p3)
- Observations of other objects
- K11L01J 2011 LJ1 (Q=4.093 AU, arc=13 days, H=19.3 ~467m) from ARO Westfield (June 17.11-12p4)
- K11L01D 2011 LD1 (i=39.4°, q=0.376 AU, arc=14 days, H=18.8 ~589m) from ARO Westfield (June 17.16-17p4)
- K11G65Q 2011 GQ65 (arc=64 days, H=18.8 ~589m) from ARO Westfield (June 17.19-20p4)
- K11G62A 2011 GA62 (arc=67 days, H=19.1 ~513m) from ARO Westfield (June 17.11-12p4)
- K11E78Z 2011 EZ78 (arc=92 days, H=17.3 ~1.17 km) from New Millennium Obs. (June 13.89p2)
- K08T10R 2008 TR10 (arc=2 opp, H=20.5 ~269m) from ARO Westfield (June 17.13-14p4)
- K08H00E 2008 HE (q=0.113 AU, Q=4.413 AU, arc=2 opp, H=18.1 ~812m) from ARO Westfield (June 17.18-19p4)
- K07L19Q 2007 LQ19 (Q=4.246 AU, arc=3 opp, H=17.1 ~1.29 km) from ARO Westfield (June 17.17p3)
- K06M10J 2006 MJ10 (i=39.3°, arc=3 opp, H=18.7 ~616m) from Pan-STARRS 1 (PS1) (June 13.37-39p2)
- K04L00H 2004 LH (i=39.5°, arc=3 opp, H=18.8 ~589m) from ARO Westfield (June 17.19-20p3)
- K04J02O 2004 JO2 (arc=3 opp, H=17.4 ~1.12 km) from ARO Westfield (June 17.14-15p4)
- Q7759 267759 2003 MC7 from PS1 (June 15.50-51p2)
- D9345 139345 2001 KA67 from PS1 (June 12.59-60p2)
- D7170 137170 1999 HF1 from New Millennium Obs. (June 13.89p1 & 13.94p2)
- 68348 68348 2001 LO7 from New Millennium Obs. (June 13.91p1 & 13.96p2) and Blanquita Obs. (June 17.94-95p3)
- 05496 5496 1973 NA from New Millennium Obs. (June 13.98p2)
- 03988 3988 1986 LA from New Millennium Obs. (June 13.90p2 & 13.95p2) and Blanquita Obs. (June 17.99p3)
- 03288 3288 Seleucus (1982 DV) from New Millennium Obs. (June 13.95p2)
- 03103 3103 Eger (1982 BB) from New Millennium Obs. (June 13.97p2)
- 01036 1036 Ganymed (1924 TD) from Urseanu Obs. (June 7.86-88p5), New Millennium Obs. (June 13.91-92p2 & 13.96p2), and Blanquita Obs. (June 18.05-06p3)
Observers on 18 June '11
Five observers appear in today's MPEC.
|Code||Observer / observatory|
|H21||Astronomical Research Obs. Westfield in Illinois, 11 in MPEC 2011-M12 -- 2011 LJ1, 2011 LD1, 2011 LC19, 2011 LA19, 2011 GQ65, 2011 GA62, 2008 TR10, 2008 HE, 2007 LQ19, 2004 LH, 2004 JO2|
|I99||Blanquita Obs. in Spain, 3 in MPEC 2011-M12 -- 68348, 3988, 1036|
|A24||New Millennium Obs. in Italy, 9 in MPEC 2011-M12 -- 2011 LT17, 2011 EZ78, 68348, 137170, 5496, 3988, 3288, 3103, 1036|
|F51||Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2011-M12 -- 2006 MJ10, 267759, 139345|
|A92||Urseanu Obs. in Romania, 1 in MPEC 2011-M12 -- 1036|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 18 June '11
Notes for Today's Latest Risk Assessments
|2011 LC19||JPL Sentry||1500||2107||2||1.3e-09||-5.88||-6.07||0||JPL: "Analysis based on 31 observations spanning 6.8726 days (2011-Jun-10.3103 to 2011-Jun-17.18291)." Diameter approximately 0.750 km. from mean, weighted H=18.3.|
|2011 LT17||JPL Sentry||1500||2072-2111||7||1.2e-06||-4.49||-4.56||0||JPL: "Analysis based on 81 observations spanning 6.7927 days (2011-Jun-09.33984 to 2011-Jun-16.132524)." Diameter approximately 0.140 km. from mean, weighted H=21.9.|
|NEODyS||1500||2072-2073||2||8.75e-07||-4.58||-4.59||0||NEODyS: "Based on 83 optical observations (of which 2 are rejected as outliers) from 2011-06-09.341 to 2011-06-16.133."|
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 June '11
Times are UTC for when items were noted or added by The Tracking News.
|1500||Noted that JPL Sentry has updated its 2011 LC19 risk assessment - see above|
Noted that JPL Sentry has updated its 2011 LT17 risk assessment - see above
Noted that NEODyS has updated its 2011 LT17 risk assessment - see above
Grabbed MPEC 2011-M12 - Daily Orbit Update - see above