Contents on 30 September '07
- IAU Minor Planet Center
- Impact Risk Monitoring -- two objects reported
Notes: Due to travel, these pages will update irregularly for the rest of the month.
Until September 16th this daily news page, which had included links to news and science papers as well as some occasional original reporting, was called Major News About Minor Objects. Without the news-link and science-link sections, this page was renamed as The Tracking News to more accurately reflect its continuing purpose.
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 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 30 September '07
The MPC's NEO Confirmation Page has 5 listings: 1 new, 4 updated
When last checked at 2304 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new and four updated listings. Of these, one was a "one nighter."
To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object by Birtwhistle et al. at Suno Observatory.
New MPECs on 30 September '07
Minor Planet Electronic Circulars
As of last check at 2304 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
- K07S06N 2007 SN6 (small asteroid, arc=11 days, H=25.1 ~32m) from the Spacewatch 1.8m telescope (Sept. 30.17p2)
- K07S00J 2007 SJ (arc=13 days, H=16.2 ~1.95 km) from Spacewatch 1.8m (Sept. 30.15-16p3)
- Observations of recently (no longer) risk-listed objects
- K07S06Q 2007 SQ6 (almost small, arc=8 days, H=21.8 ~148m) from Alter Satzberg Obs. (Sept. 29.86-88p3)
- K07R09V 2007 RV9 (arc=20 days, H=20.1 ~323m) from Spacewatch 1.8m (Sept. 30.13-14p3)
- Observations of small asteroids (H>22.0)
- K07S11G 2007 SG11 (arc=5 days, H=22.7 ~98m) from Begues Obs. (Sept. 29.00p3)
- Observations of other objects
- K07R01T 2007 RT1 (arc=26 days, H=20.6 ~257m) from Spacewatch 1.8m (Sept. 30.19-20p3)
- K07P11U 2007 PU11 (Q=4.384 AU, arc=3 opp, H=16.3 ~1.86 km) from Smolyan Obs. (Sept. 17.96-97p5)
- K07L32R 2007 LR32 (arc=126 days, H=17.2 ~1.23 km) from Smolyan Obs. (Sept. 17.93-95p4)
- K07G05Z 2007 GZ5 (arc=168 days, H=21.1 ~204m) from Spacewatch 1.8m (Sept. 30.18p2)
- K02S00V 2002 SV (arc=2 opp, H=19.8 ~371m) from Fiamene Obs. (Sept. 21.83-84p4)
- K02RB8C 2002 RC118 (Q=4.624 AU, arc=2 opp, H=16.8 ~1.48 km) from Fiamene Obs. (Sept. 21.85p4)
- K02Q07C 2002 QC7 (arc=2 opp, H=19.9 ~355m) from Spacewatch 1.8m (Sept. 30.12-13p3)
- 16834 16834 1997 WU22 from Montana Blanca Obs. (Sept. 29.91-92p2)
- 16636 16636 1993 QP from Bornheim Obs. (Aug. 29.83-84p3 & Sept. 4.90-91p4) and Ametlla del Valles Obs. (Sept. 27.96-02p5)
Observers on 30 September '07
Eight observing facilities appear in today's MPEC.
|Code||Observer / observatory|
|B03||Alter Satzberg Obs. in Austria, 1 in MPEC 2007-S70 -- 2007 SQ6|
|B37||Ametlla del Valles Obs. in Spain, 1 in MPEC 2007-S70 -- 16636|
|170||Begues Obs. in Spain, 1 in MPEC 2007-S70 -- 2007 SG11|
|127||Bornheim Obs. in Germany, 1 in MPEC 2007-S70 -- 16636|
|B23||Fiamene Obs. in Italy, 2 in MPEC 2007-S70 -- 2002 SV, 2002 RC118|
|J46||Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2007-S70 -- 16834|
|071||Smolyan Obs. in Bulgaria, 2 in MPEC 2007-S70 -- 2007 PU11, 2007 LR32|
|291||Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2007-S70 -- 2007 SN6, 2007 SJ, 2007 RV9, 2007 RT1, 2007 GZ5, 2002 QC7|
Impact Risk Monitoring on 30 September '07
Notes for Today's Latest Risk Assessments
|2007 SN6||JPL||1423||2022-2059||2||2.3e-06||-5.04||-5.14||0||JPL: "Analysis based on 20 observations spanning 10.884 days (2007-Sep-19.28894 to 2007-Sep-30.17302)." Diameter approximately 0.036 km. from mean, weighted H=24.9.|
|NEODyS||1423||2022-2085||4||2.8e-06||-4.92||-4.99||0||NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2007/09/19.290 to 2007/09/30.174."|
|2007 SJ||NEODyS||1423||R E M O V E D|
|JPL||1423||R E M O V E D||JPL: Risk listing removed at 1102 UTC.|
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 30 September '07
Times are UTC for when the items were noted or added by Tracking News.
|1423||Noted that JPL has removed 2007 SJ as an impact risk - see above|
Noted that NEODyS has removed 2007 SJ as an impact risk - see above
Noted that JPL has updated its 2007 SN6 risk assessment - see above
Noted that NEODyS has updated its 2007 SN6 risk assessment - see above
Grabbed MPEC 2007-S70 - Daily Orbit Update - see above