The Ontario Sudbury impact structure, seen here in Space Shuttle SIR-B radar imaging from a NASA GSFC tutorial on "Remote Sensing of Craters," shows evidence of its great age and the geologic forces that have reshaped it from circular to ellipsoidal. New evidence of the impact has been found recently to the southwest in Minnesota -- see news below.
Contents on 15 July '07
- Minor-Object News -- four items
- Minor-Object Science -- none yet today
- IAU Minor Planet Center
- Impact Risk Monitoring -- one object reported
- Consolidated Risk Tables - CRT page
- Ephemerides for risk-rated objects
- Ephemerides for small asteroids
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 this year with a calendar interface. And use the all-up news archive to access news anytime since A/CC began in early 2002. To keep track of what's new each day, watch the Chronology section.
Minor-Object News on 15 July '07
- "Meteorite debris from 1.85 billion years ago found in NE Minn.," AP at West Central Tribune 15 July - Quote: "[Minnesota Geological Survey geologist Mark] Jirsa says the Gunflint area probably was in or near a shallow sea when the meteorite stuck. He says there are indications that a huge tsunami may have ripped up the sea bottom and seashore, mixing them with rocks fallen from the sky into the concrete-appearing geological mess he found." - Note: See an image of the Sudbury impact structure above.
- "RP at risk from asteroids," The Philippine Star at ABS-CBN 15 July - Quote: "Researchers in Britain have identified the Philippines as among 10 countries in the world 'most at risk' from being hit by small asteroids less than one kilometer in diameter, but the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) said Filipinos need not be alarmed."
- Distant EKOs: The July edition of Distant EKOs has been posted. In a tally of distant objects it reports the current count of trans-Neptunian objects (TNOs) to be "1054 (including Pluto)" and 199 Centaurs/scattered disk objects (SDOs). Abstracts, some with links to publicly-accessible preprints, are given for topics such as "Resonance Sticking in the Scattered Disk," "Dynamical Behaviour of Planetesimals Temporarily Captured by a Planet from Heliocentric orbits," and "Near-Infrared Spectroscopy of Charon: Possible Evidence for Cryovolcanism on Kuiper Belt Objects." One paper reviews a previous interpretation of X-ray data as representing occultations by distant objects, and another examines the dynamics of the Kuiper Belt region between 33 and 63 AU through comparitive planetary system analysis.
- "NASA Ponders Human Mission to Moons of Mars," LiveScience.com 14 July - Quote: "NASA is ... co-sponsoring in early November the first international conference on sending robots and humans to Phobos and Deimos ... at the NASA Ames Research Center in California... Phobos and Deimos are thought by many scientists to be captured asteroids."
NEOCP Activity on 15 July '07
The MPC's NEO Confirmation Page has 6 listings: 2 new, 3 updated, 1 comet
When last checked at 2356 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had two new, three updated, and one comet listings. Of these, three were "one nighters." So far Major News has counted a total of seven objects listed on the NEOCP at some point today.
New MPECs on 15 July '07
Minor Planet Electronic Circulars
As of last check at 2356 UTC, there has been one MPEC issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- Observations of risk-listed objects
- K07L19Q 2007 LQ19 (Q=4.245 AU, arc=30 days, H=17.8 ~933m) from Tiki Obs. (July 13.59-62p2)
- Observations of almost-small asteroids (21.7<H<=22.0)
- K07K02W 2007 KW2 (arc=51 days, H=22.0 ~135m) from Crimean Astrophysical Obs. (CrAO) (July 10.85-86p13 & 11.02p2)
- Observations of other objects
- K07N00Q 2007 NQ (arc=4 days, H=19.6 ~407m) from Astronomical Research Obs. (ARO) (July 14.17-18p3) and Klet Obs. (July 14.87-88p5)
- K07M24B 2007 MB24 (i=47.7°, arc=21 days, H=18.4 ~708m) from New Millennium Obs. (July 12.93-02p11) and Wildberg Obs. (July 14.93-94p4)
- K07M13L 2007 ML13 (arc=23 days, H=20.2 ~309m) from Guidestar Obs. (July 14.92-94p2 & 15.04p1)
- K07M04C 2007 MC4 (arc=25 days, H=21.1 ~204m) from ARO (July 14.13-14p5)
- K07M00R 2007 MR (arc=26 days, H=21.7 ~155m) from ARO (July 14.10-11p3)
- K07L32R 2007 LR32 (arc=49 days, H=17.2 ~1.23 km) from New Millennium Obs. (July 12.99-08p9)
- K07L08V 2007 LV8 (arc=33 days, H=20.1 ~323m) from the Catalina Sky Survey (CSS) (July 14.26-27p3) and Guidestar Obs. (July 14.96-98p3)
- K07L00S 2007 LS (Q=4.536 AU, arc=36 days, H=17.7 ~977m) from ARO (July 14.13-14p2)
- K07K00J 2007 KJ (arc=59 days, H=18.8 ~589m) from ARO (July 14.11-13p3)
- K07G00C 2007 GC (arc=98 days, H=21.3 ~186m) from ARO (July 14.15-16p4)
- K07F01K 2007 FK1 (arc=120 days, H=20.2 ~309m) from Naef Obs. (July 14.00-01p2)
- K06X00A 2006 XA (arc=225 days, H=17.3 ~1.17 km) from Naef Obs. (July 14.89-91p3)
- K06WC7P 2006 WP127 (Q=4.477 AU, arc=3 opp, H=18.3 ~741m) from Guidestar Obs. (July 14.00-01p2 & 15.06p1)
- K06G00B 2006 GB (arc=2 opp, H=20.3 ~295m) from CSS (July 14.21-22p3)
- K04S09T 2004 ST9 (arc=2 opp, H=18.0 ~851m) from New Millennium Obs. (July 12.98-01p3)
- K04B11E 2004 BE11 (arc=2 opp, H=19.4 ~446m) from ARO (July 14.38-39p3)
- K03W25B 2003 WB25 (arc=3 opp, H=17.8 ~933m) from ARO (July 14.18-19p3)
- K01R17V 2001 RV17 (arc=2 opp, H=20.2 ~309m) from Buchloe Obs. (July 13.93p3)
- F9928 159928 2005 CV69 from CSS (July 14.17-18p4)
- D6818 136818 1997 MW1 from New Millennium Obs. (July 12.90-94p8)
- 85275 85275 1994 LY from Thousand Oaks Obs. (July 8.32p1, 8.38-40p2, 13.28p1, 13.36-40p2, 14.26p1 & 14.32-36p2)
- 24443 24443 2000 OG from Gualba Obs. (July 13.89p2)
Observers on 15 July '07
Twelve observing facilities appear in today's MPECs.
|H55||Astronomical Research Obs. in Illinois, 8 in MPEC 2007-N41 -- 2007 NQ, 2007 MC4, 2007 MR, 2007 LS, 2007 KJ, 2007 GC, 2004 BE11, 2003 WB25|
|215||Buchloe Obs. in Germany, 1 in MPEC 2007-N41 -- 2001 RV17|
|703||Catalina Sky Survey in Arizona, 3 in MPEC 2007-N41 -- 2007 LV8, 2006 GB, 159928|
|095||Crimean Astrophysical Obs. in the Ukraine, 1 in MPEC 2007-N41 -- 2007 KW2|
|442||Gualba Obs. in Spain, 1 in MPEC 2007-N41 -- 24443|
|A17||Guidestar Obs. in Germany, 3 in MPEC 2007-N41 -- 2007 ML13, 2007 LV8, 2006 WP127|
|046||Klet Obs. in the Czech Republic, 1 in MPEC 2007-N41 -- 2007 NQ|
|A13||Naef Obs. in Switzerland, 2 in MPEC 2007-N41 -- 2007 FK1, 2006 XA|
|A24||New Millennium Obs. in Italy, 4 in MPEC 2007-N41 -- 2007 MB24, 2007 LR32, 2004 ST9, 136818|
|G69||Thousand Oaks Obs. in southern California, 1 in MPEC 2007-N41 -- 85275|
|F85||Tiki Obs. in Tahiti, 1 in MPEC 2007-N41 -- 2007 LQ19|
|198||Wildberg Obs. in Germany, 1 in MPEC 2007-N41 -- 2007 MB24|
Impact Risk Monitoring on 15 July '07
Notes for Today's Latest Risk Assessments
|2007 LQ19||JPL||1439||R E M O V E D||JPL: Risk listing removed at 1000 UTC.|
|NEODyS||1439||R E M O V E D|
An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from an 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" for more about this.
Chronology on 15 July '07
Times are UTC for when the items were noted or added by Major News.
|1920||Added link to news story, "RP at risk from asteroids"|
Added link to news story, "Meteorite debris from 1.85 billion years ago found in NE Minn."
|1513||Added news report, "Distant EKOs"|
Added link to news story, "NASA Ponders Human Mission to Moons of Mars"
|1439||Noted that JPL has removed 2007 LQ19 as an impact risk - see above|
Noted that NEODyS has removed 2007 LQ19 as an impact risk - see above
Grabbed MPEC 2007-N41 - Daily Orbit Update - see above