On this day sixteen years ago, the Jupiter-bound NASA Galileo spacecraft performed the first-ever asteroid flyby, passing 951 Gaspra, which is seen here in exaggerated color. Credit: NASA/JPL.
Contents on 29 October '07
- IAU Minor Planet Center
- Impact Risk Monitoring -- five objects reported
- Consolidated Risk Tables - CRT page
- Old & new CRT Archive
- Ephemerides for risk-rated objects
- Old News Archive & Small Objects Archive
Note: Due to travel, this Web site and its news pages will update less frequently and at sometimes irregular intervals during the rest of October and early November.
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 29 October '07
The MPC's NEO Confirmation Page has 1 listing: 1 updated
When last checked at 2354 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 five 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 29 October '07
Minor Planet Electronic Circulars
As of last check at 2354 UTC, there have been five MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2007-U81 time-stamped "06:09 UT" - Daily Orbit Update - see below
- MPEC 2007-U82 time-stamped "15:50 UT" - 2007 UL12 - see below
- MPEC 2007-U83 time-stamped "15:53 UT" - 2007 UM12 - see below
- MPEC 2007-U84 time-stamped "16:38 UT" - 2007 UN12 - see below
- MPEC 2007-U85 time-stamped "17:43 UT" - 1990 UO = 2007 UV3
MPEC 2007-U85 - "17:43 UT" - 1990 UO = 2007 UV3
- J90U00O 1990 UO (q=0.285 AU, H=19.7 ~389m) from the Mt. Lemmon Survey (MLS) (Sept. 18.43-44p4)
MPEC 2007-U84 - "16:38 UT" - 2007 UN12
- K07U12N 2007 UN12 (risk-listed, Earth MOID=0.4 LD, H=28.6 ~6m) was discovered at 0856 UT on 21 Oct. by the Catalina Sky Survey (CSS), which observed it at Oct. 21.37-39p3 and 21.44-45p3. The discovery was confirmed by Lindenberg Obs. (Oct. 21.99p3), Schiaparelli Obs. (Oct. 22.09-10p3), Astronomical Research Obs. (ARO) (Oct. 22.30-31p3), Guidestar Obs. (Oct. 22.78-82p4), Gnosca Obs. (Oct. 22.87-88p3), the Spacewatch 1.8m telescope (Oct. 23.21-22p3), LINEAR (Oct. 23.31-36p4), Farpoint Obs. (Oct. 23.31-32p3), Great Shefford Obs. (Oct. 23.88-93p5), Jim Young via Table Mtn. Obs. (Oct. 24.26-30p4), MLS (Oct. 24.30-31p4, 24.40p4 & 25.32p4), and Grasslands Obs. (Oct. 25.40p2). This object is now within ten lunar distances (LD) of Earth, reaching 4.1 LD on 27 Oct.
MPEC 2007-U83 - "15:53 UT" - 2007 UM12
- K07U12M 2007 UM12 (H=21.6 ~162m) was discovered at 0547 UT on 26 Oct. by the MLS, which observed it at Oct. 26.24-27p8 and 27.07-08p4. The discovery was confirmed by Magdalena Ridge Obs. (MRO) (Oct. 27.11-12p9 & 28.13p5), the Siding Spring Survey (SSS) (Oct. 27.48-49p2), ARO (Oct. 28.02-03p3), and Great Shefford Obs. (Oct. 28.89-91p2).
MPEC 2007-U82 - "15:50 UT" - 2007 UL12
- K07U12L 2007 UL12 (risk-listed, q=0.386 AU, Earth MOID=7.9 LD, H=20.4 ~282m) was discovered at 1126 UT on 25 Oct. by the MLS, which observed it at Oct. 25.48-53p7, 26.31-32p4, 26.47p4, and 26.53p4. The discovery was confirmed by ARO (Oct. 28.25-26p3).
- Observations of risk-listed objects
- K07U01Y 2007 UY1 (small asteroid, arc=10 days, H=22.8 ~93m) from MRO (Oct. 28.14-15p5)
- K07T72H 2007 TH72 (small asteroid, arc=13 days, H=24.2 ~49m) from MRO (Oct. 28.16-22p5)
- K07T24U 2007 TU24 (arc=17 days, H=20.1 ~323m) from Tenagra II Obs. (Oct. 28.22p3)
- Observations of small asteroids (H>22.0)
- K07U02C 2007 UC2 (arc=10 days, H=23.0 ~85m) from ARO (Oct. 28.04-05p3) and Tenagra II Obs. (Oct. 28.24p3)
- Observations of almost-small asteroids (21.7<H<=22.0)
- K07T66D 2007 TD66 (arc=16 days, H=21.9 ~141m) from ARO (Oct. 28.06-07p3)
- Observations of other objects
- K07U00T 2007 UT (i=45.7°, arc=11 days, H=21.5 ~170m) from Shenton Park Obs. (Oct. 28.64p3) and Begues Obs. (Oct. 28.76p4)
- K07T65R 2007 TR65 (i=43.5°, arc=16 days, H=18.9 ~562m) from Shenton Park Obs. (Oct. 28.64-65p3)
- K07T15G 2007 TG15 (arc=21 days, H=19.7 ~389m) from Lindenberg Obs. (Oct. 28.74-75p3) and Greiner Research Obs. (Oct. 29.01-02p8)
- K07R19V 2007 RV19 (Q=5.322 AU, arc=124 days, H=18.8 ~589m) from Tenagra II Obs. (Oct. 28.20-21p3)
- K07R17W 2007 RW17 (arc=45 days, H=21.4 ~178m) from Tenagra II Obs. (Oct. 28.23p2)
- K07R17U 2007 RU17 (q=0.356 AU, arc=45 days, H=18.2 ~776m) from ARO (Oct. 28.03-04p3) and Tenagra II Obs. (Oct. 28.21p3)
- K07R05F 2007 RF5 (arc=53 days, H=18.4 ~708m) from Petit Jean Mtn. South Obs. (PJMSO) (Oct. 28.25-26p6)
- K07P11U 2007 PU11 (Q=4.384 AU, arc=3 opp, H=16.3 ~1.86 km) from PJMSO (Oct. 28.32-33p6)
- K07L32R 2007 LR32 (arc=156 days, H=17.2 ~1.23 km) from Lindenberg Obs. (Oct. 28.73-74p3)
- K02RB8C 2002 RC118 (Q=4.624 AU, arc=2 opp, H=16.7 ~1.55 km) from PJMSO (Oct. 28.30-31p5)
- 02340 2340 Hathor (1976 UA) from SSS (Oct. 27.51p2)
- 02212 2212 Hephaistos (1978 SB) from PJMSO (Oct. 28.31-32p5)
Observers on 29 October '07
A total of 20 observing facilities appear in today's MPECs.
|Code||Observer / observatory|
|H55||Astronomical Research Obs. (ARO) in Illinois, 6 in MPECs 2007-U81, 2007-U82, 2007-U83 & 2007-U84 -- 2007 UN12, 2007 UM12, 2007 UL12, 2007 UC2, 2007 TD66, 2007 RU17|
|170||Begues Obs. in Spain, 1 in MPEC 2007-U81 -- 2007 UT|
|703||Catalina Sky Survey in Arizona, 1 in MPEC 2007-U84 -- 2007 UN12|
|734||Farpoint Obs. in Kansas, 1 in MPEC 2007-U84 -- 2007 UN12|
|143||Gnosca Obs. in Switzerland, 1 in MPEC 2007-U84 -- 2007 UN12|
|651||Grasslands Obs. in Arizona, 1 in MPEC 2007-U84 -- 2007 UN12|
|J95||Great Shefford Obs. in England, 2 in MPECs 2007-U83 & 2007-U84 -- 2007 UN12, 2007 UM12|
|H51||Greiner Research Obs. in Wisconsin, 1 in MPEC 2007-U81 -- 2007 TG15|
|A17||Guidestar Obs. in Germany, 1 in MPEC 2007-U84 -- 2007 UN12|
|704||LINEAR in New Mexico, 1 in MPEC 2007-U84 -- 2007 UN12|
|A80||Lindenberg Obs. in Germany, 3 in MPECs 2007-U81 & 2007-U84 -- 2007 UN12, 2007 TG15, 2007 LR32|
|H01||Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2007-U81 & 2007-U83 -- 2007 UY1, 2007 UM12, 2007 TH72|
|G96||Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2007-U82, 2007-U83, 2007-U84 & 2007-U85 -- 2007 UN12, 2007 UM12, 2007 UL12, 1990 UO|
|H45||Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2007-U81 -- 2007 RF5, 2007 PU11, 2002 RC118, 2212|
|204||Schiaparelli Obs. in Italy, 1 in MPEC 2007-U84 -- 2007 UN12|
|D21||Shenton Park Obs. in Western Australia, 2 in MPEC 2007-U81 -- 2007 UT, 2007 TR65|
|E12||Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2007-U81 & 2007-U83 -- 2007 UM12, 2340|
|291||Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2007-U84 -- 2007 UN12|
|6735||Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2007-U84 -- 2007 UN12|
|926||Tenagra II Obs. in Arizona, 5 in MPEC 2007-U81 -- 2007 UC2, 2007 TU24, 2007 RW17, 2007 RV19, 2007 RU17|
Impact Risk Monitoring on 29 October '07
Notes for Today's Latest Risk Assessments
|2007 UN12||JPL Sentry||2354||2049-2107||21||1.7e-04||-6.03||-6.87||0||JPL: "Analysis based on 55 observations spanning 4.0283 days (2007-Oct-21.37247 to 2007-Oct-25.40077)." Diameter approximately 0.006 km. from mean, weighted H=28.7.|
|2007 UL12||JPL Sentry||2027||2094-2106||3||3.0e-09||-6.08||-6.14||0||JPL: "Analysis based on 22 observations spanning 2.7800 days (2007-Oct-25.47694 to 2007-Oct-28.256955)." Diameter approximately 0.300 km. from mean, weighted H=20.3.|
|2007 UY1||JPL Sentry||1205||2093-2107||2||1.6e-09||-8.18||-8.41||0||JPL: "Analysis based on 43 observations spanning 10.004 days (2007-Oct-18.14415 to 2007-Oct-28.14774)." Diameter approximately 0.094 km. from mean, weighted H=22.8.|
|2007 TH72||NEODyS||1431||2082-2087||2||6.62e-09||-7.89||-7.92||0||NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2007/10/15.204 to 2007/10/28.219."|
|JPL Sentry||1205||R E M O V E D||JPL: Risk listing removed at 1027 UTC.|
|2007 TU24||JPL Sentry||1205||2095-2104||2||4.2e-07||-4.41||-4.46||0||JPL: "Analysis based on 68 observations spanning 16.955 days (2007-Oct-11.26838 to 2007-Oct-28.22359)." Diameter approximately 0.320 km. from mean, weighted H=20.1.|
|NEODyS||1431||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 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 29 October '07
Times are UTC for when the items were noted or added by The Tracking News.
|2354||Noted that JPL Sentry has posted 2007 UN12 as an impact risk - see above|
|2027||Noted that JPL Sentry has posted 2007 UL12 as an impact risk - see above|
Grabbed MPEC 2007-U85 - 1990 UO = 2007 UV3 - see above
|1717||Grabbed MPEC 2007-U84 - 2007 UN12 - see above|
|1641||Grabbed MPEC 2007-U82 - 2007 UL12 - see above|
Grabbed MPEC 2007-U83 - 2007 UM12 - see above
|1431||Noted that NEODyS has updated its 2007 TH72 risk assessment - see above|
Noted that NEODyS has removed 2007 TU24 as an impact risk - see above
|1205||Noted that JPL Sentry has removed 2007 TH72 as an impact risk - see above|
Noted that JPL Sentry has updated its 2007 TU24 risk assessment - see above
Noted that JPL Sentry has updated its 2007 UY1 risk assessment - see above
Grabbed MPEC 2007-U81 - Daily Orbit Update - see above