Contents on 28 September '07
- IAU Minor Planet Center
- Impact Risk Monitoring -- three 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 28 September '07
The MPC's NEO Confirmation Page has 5 listings: 1 new, 4 updated
When last checked at 2116 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new and four updated listings. Of these, two were "one nighters." So far Tracking News has counted a total of seven 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 28 September '07
Minor Planet Electronic Circulars
As of last check at 2116 UTC, there have been eight MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2007-S61 time-stamped "06:05 UT" - Daily Orbit Update - see below
- MPEC 2007-S62 time-stamped "12:35 UT" - 2007 SR11 - see below
- MPEC 2007-S63 time-stamped "14:00 UT" - Observable Comets - see below
- MPEC 2007-S64 time-stamped "14:27 UT" - Distant Minor Planets - see below
- MPEC 2007-S65 time-stamped "14:56 UT" - Atens and Apollos - see below
- MPEC 2007-S66 time-stamped "14:56 UT" - Amors - see below
- MPEC 2007-S67 time-stamped "14:56 UT" - Unusual Minor Planets - see below
- MPEC 2007-S68 time-stamped "14:56 UT" - PHAs
MPEC 2007-S68 - "14:56 UT" - PHAs
MPEC 2007-S67 - "14:56 UT" - Unusual Minor Planets
MPEC 2007-S66 - "14:56 UT" - Amors
MPEC 2007-S65 - "14:56 UT" - Atens and Apollos
MPEC 2007-S64 - "14:27 UT" - Distant Minor Planets
MPEC 2007-S63 - "14:00 UT" - Observable Comets
MPEC 2007-S62 - "12:35 UT" - 2007 SR11
- K07S11R 2007 SR11 (risk-listed, Earth MOID=8.0 LD, H=21.9 ~141m) was discovered at 0957 UT 26 Sept. by the Mt. Lemmon Survey (MLS), which observed it at Sept. 26.34-36p4, 26.41-43p4, 26.51p4, 27.40-42p4, and 27.47p4. The discovery was confirmed by Great Shefford Obs. (Sept. 27.01p1 & 27.10p1).
- Observations of risk-listed objects
- K07R09U 2007 RU9 (arc=17 days, H=20.8 ~234m) from Desert Moon Obs. (Sept. 27.23-25p3)
- Observations of recently (no longer) risk-listed objects
- K07S06Q 2007 SQ6 (almost small, arc=5 days, H=21.8 ~148m) from Great Shefford Obs. (Sept. 26.93-94p3) and Desert Moon Obs. (Sept. 27.13-14p3)
- K07R19X 2007 RX19 (i=40.4°, arc=13 days, H=18.4 ~708m) from Desert Moon Obs. (Sept. 27.19-21p3)
- K07R09R 2007 RR9 (Q=4.676 AU, arc=17 days, H=20.3 ~295m) from Desert Moon Obs. (Sept. 27.16-17p3)
- Observations of small asteroids (H>22.0)
- K07S01V 2007 SV1 (arc=7 days, H=24.7 ~39m) from Jim Young via Table Mtn. Obs. (Sept. 27.20-24p4)
- Observations of other objects
- K07S06P 2007 SP6 (arc=6 days, H=18.0 ~851m) from Desert Moon Obs. (Sept. 27.42-43p3)
- K07R20D 2007 RD20 (arc=13 days, H=21.1 ~204m) from Desert Moon Obs. (Sept. 27.39-40p3)
- K07R17V 2007 RV17 (arc=15 days, H=18.9 ~562m) from Desert Moon Obs. (Sept. 27.27p3)
- K07R12R 2007 RR12 (arc=15 days, H=19.8 ~371m) from University Hills Obs. (Sept. 27.38p6)
- K07R05F 2007 RF5 (arc=22 days, H=18.5 ~676m) from Desert Moon Obs. (Sept. 27.29p3) and University Hills Obs. (Sept. 27.39p6)
- K07P11U 2007 PU11 (Q=4.384 AU, arc=3 opp, H=16.3 ~1.86 km) from Greiner Research Obs. (Sept. 28.13-14p10)
- K07P08A 2007 PA8 (Q=4.697 AU, arc=49 days, H=15.9 ~2.24 km, q=0.958 AU) from Desert Moon Obs. (Sept. 27.09-11p3)
- K07L32R 2007 LR32 (arc=125 days, H=17.2 ~1.23 km) from University Hills Obs. (Sept. 27.18-19p6)
- K04T10H 2004 TH10 (q=0.214 AU, arc=4 opp, H=18.6 ~645m) from MLS (Sept. 26.45-46p4, 27.42-44p4 & 27.51p4)
- F3591 153591 2001 SN263 from MLS (Sept. 27.30-32p4)
- 66272 66272 1999 JW6 from Desert Moon Obs. (Sept. 27.46-49p3)
Observers on 28 September '07
Six observing facilities appear in today's MPECs.
|Code||Observer / observatory|
|448||Desert Moon Obs. in New Mexico, 10 in MPEC 2007-S61 -- 2007 SQ6, 2007 SP6, 2007 RX19, 2007 RV17, 2007 RU9, 2007 RR9, 2007 RF5, 2007 RD20, 2007 PA8, 66272|
|J95||Great Shefford Obs. in England, 2 in MPECs 2007-S61 & 2007-S62 -- 2007 SR11, 2007 SQ6|
|H51||Greiner Research Obs. in Wisconsin, 1 in MPEC 2007-S61 -- 2007 PU11|
|G96||Mt. Lemmon Survey in Arizona, 3 in MPECs 2007-S61 & 2007-S62 -- 2007 SR11, 2004 TH10, 153591|
|6735||Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2007-S61 -- 2007 SV1|
|G72||University Hills Obs. in southern California, 3 in MPEC 2007-S61 -- 2007 RR12, 2007 RF5, 2007 LR32|
Impact Risk Monitoring on 28 September '07
Notes for Today's Latest Risk Assessments
|2007 SR11||JPL||1616||2017-2107||10||3.9e-08||-5.60||-6.09||0||JPL: "Analysis based on 22 observations spanning 1.1249 days (2007-Sep-26.34262 to 2007-Sep-27.46749)." Diameter approximately 0.140 km. from mean, weighted H=21.9.|
|2007 SP11||NEODyS||2117||2008-2073||7||1.16e-07||-1.93||-1.93||0||NEODyS: "Based on 12 optical observations (of which 1 are rejected as outliers) from 2007/09/25.465 to 2007/09/27.492."|
|2007 RU9||NEODyS||1450||R E M O V E D|
|JPL||1450||R E M O V E D||JPL: Risk listing removed at 1012 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 28 September '07
Times are UTC for when the items were noted or added by Tracking News.
|2116||Noted that NEODyS has posted 2007 SP11 as an impact risk - see above|
|1616||Noted that JPL has posted 2007 SR11 as an impact risk - see above|
Grabbed MPEC 2007-S65 - Atens and Apollos - see above
Grabbed MPEC 2007-S66 - Amors - see above
Grabbed MPEC 2007-S67 - Unusual Minor Planets - see above
Grabbed MPEC 2007-S68 - PHAs - see above
|1450||Noted that JPL has removed 2007 RU9 as an impact risk - see above|
Noted that NEODyS has removed 2007 RU9 as an impact risk - see above
Grabbed MPEC 2007-S61 - Daily Orbit Update - see above
Grabbed MPEC 2007-S62 - 2007 SR11 - see above
Grabbed MPEC 2007-S63 - Observable Comets - see above
Grabbed MPEC 2007-S64 - Distant Minor Planets - see above