Contents on 17 September '08
- IAU Minor Planet Center
- NEOCP Activity -- one listing: 1 updated
- New MPECs -- one MPEC
- Observers -- four observing facilities
- Impact Risk Monitoring -- one object
- Chronology
Resources:
- Consolidated Risk Tables - the CRT page
- Earth's Busy Neighborhood Traffic Report
- Ephemerides for risk-rated and nearby objects
- Old & new CRT Archive
- Old News Archive & Small Objects Archive
The latest A/CC news is available via framed access, 
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 September '08
The MPC's NEO Confirmation Page has 1 listing: 1 updated
When last checked at 2358 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one updated listing. This was a "one nighter." So far The Tracking News has counted a total of two objects listed on the NEOCP at some point today.
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 17 September '08
Minor Planet Electronic Circulars
As of last check at 2358 UTC, there has been one MPEC issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
<< DOU on 17 Sept. '08 >> MPEC 2008-S02 - "06:08 UT" - Daily Orbit Update
- K04S56B 2004 SB56 (arc=2 opp, H=19.2 ~490m) from Gnosca Obs. (Aug. 18.86-87p3 & 26.82-83p3) and Ametlla del Valles Obs. (Sept. 15.88-89p4)
- K03G00W 2003 GW (i=49.4°, arc=3 opp, H=16.8 ~1.48 km) from Ametlla del Valles Obs. (Sept. 15.90p4) and Hamamatsu-Yuto Obs. (Sept. 16.51-55p7)
- I9700 189700 2001 TA45 from Gnosca Obs. (Aug. 18.89-90p3)
- I8452 188452 2004 HE62 from Ametlla del Valles Obs. (Sept. 15.89-90p3) and Naef Obs. (Sept. 16.85-86p2)
- G4400 164400 2005 GN59 from Gnosca Obs. (Aug. 18.90-91p3) and Hamamatsu-Yuto Obs. (Sept. 16.56-58p7)
- 16960 16960 1998 QS52 from Hamamatsu-Yuto Obs. (Sept. 11.58-59p4)
- 04257 4257 Ubasti (1987 QA) from Gnosca Obs. (Aug. 18.87-88p3)
Observers on 17 September '08
Four observing facilities appear in today's MPEC.
| Code | Observer / observatory |
|---|---|
| B37 | Ametlla del Valles Obs. in Spain, 3 in MPEC 2008-S02 -- 2004 SB56, 2003 GW, 188452 |
| 143 | Gnosca Obs. in Switzerland, 4 in MPEC 2008-S02 -- 2004 SB56, 189700, 164400, 4257 |
| 379 | Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2008-S02 -- 2003 GW, 16960, 164400 |
| A13 | Naef Obs. in Switzerland, 1 in MPEC 2008-S02 -- 188452 |
| For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page. | |
Impact Risk Monitoring on 17 September '08
| 0000NNN000 Object | Risk Monitor | When Noted UTC | 0000T0000 Year Range | VI # | 000NN00 Prob Cum | T0000 PS Cum | T0000 PS Max | T S | Notes for Today's Latest Risk Assessments |
| 2006 CD | JPL Sentry | 1759 | 2015-2094 | 58 | 3.1e-08 | -5.30 | -5.97 | 0 | JPL: "Analysis based on 12 observations spanning 1.9971 days (2006-Feb-01.1555 to 2006-Feb-03.15263)." Diameter approximately 0.213 km. from mean, weighted H=21.0. |
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 September '08
Times are UTC for when items were noted or added by The Tracking News.
| 1759 | Noted that JPL Sentry has updated its 2006 CD risk assessment - see above |
| 1456 | Grabbed MPEC 2008-S02 - Daily Orbit Update - see above |
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