Contents on 27 October '11
- IAU Minor Planet Center
- NEOCP Activity -- 42 listings
- New MPECs -- five MPECs
- Observers -- 27 observers
- Impact Risk Monitoring -- five objects
- Chronology
Note: These A/CC news pages will update more irregularly and less frequently than usual through Sunday, October 30th.
Resources:
- Consolidated Risk Tables - the CRT page
Of 421 risk-listed objects, 30 have had news in the last 31 days. Updated at 1623 UTC on 27 Oct. - Earth's Busy Neighborhood Traffic Report -- inactive
- Ephemerides for risk-rated objects
- Object Links - mainly for radar targets & close passers - updated 15 Oct.
- News image catalog
- 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 27 October '11
The MPC's NEO Confirmation Page has 42 listings
When last checked at 2308 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 42 objects listed. Of these, 27 were "one nighters." So far The Tracking News has counted a total of 61 listings on the NEOCP today.
To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.
New MPECs on 27 October '11
Minor Planet Electronic Circulars
As of last check at 2308 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2011-U86 time-stamped "00:58 UT" - 2010 RO64 - see below
- MPEC 2011-U87 time-stamped "06:04 UT" - Daily Orbit Update - see below
- MPEC 2011-U88 time-stamped "11:41 UT" - 2011 UU158 - see below
- MPEC 2011-U89 time-stamped "11:44 UT" - 2011 UV158 - see below
- MPEC 2011-U90 time-stamped "11:46 UT" - 2011 UW158
MPEC 2011-U90 - "11:46 UT" - 2011 UW158
- K11UF8W 2011 UW158 (Earth MOID=5.1 LD, H=19.3 ~467m) from Pan-STARRS 1 (PS1) (Oct. 25.42-46p4), Tenagra II Obs. (Oct. 26.30-31p6), Tim Lister via Faulkes Telescope North (Oct. 26.33-34p4), David Tholen's team on Mauna Kea (Oct. 26.46p6), San Marcello Pistoiese Obs. (Oct. 26.92-93p3), Terskol Obs. (Oct. 27.07p3), and the Spacewatch 1.8m telescope (Oct. 27.23-24p3)
MPEC 2011-U89 - "11:44 UT" - 2011 UV158
- K11UF8V 2011 UV158 (risk-listed, H=22.1 ~129m) from PS1 (Oct. 24.55-59p4), Astronomical Research Obs. Westfield (Oct. 25.25-28p3), and Lister/Faulkes North (Oct. 25.35p3)
MPEC 2011-U88 - "11:41 UT" - 2011 UU158
- K11UF8U 2011 UU158 (H=19.5 ~426m) from the Catalina Sky Survey (CSS) (Oct. 20.38-39p4), PS1 (Oct. 26.54-58p4), and Terskol Obs. (Oct. 26.90p3)
<< DOU on 27 Oct. '11 >> MPEC 2011-U87 - "06:04 UT" - Daily Orbit Update
- Observations of risk-listed objects
- K11U21L 2011 UL21 (arc=10 days, H=15.6 ~2.57 km, q=0.725 AU) from San Marcello Pistoiese Obs. (Oct. 27.13-15p3)
- K11U21D 2011 UD21 (small asteroid, arc=9 days, H=28.6 ~6m) from Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (Oct. 26.23-24p3), Walnut Creek Obs. (Oct. 26.24-27p3), and San Marcello Pistoiese Obs. (Oct. 27.02p3)
- K11U20H 2011 UH20 (arc=9 days, H=21.1 ~204m) from Spacewatch 1.8m (Oct. 27.13p3)
- K11U00T 2011 UT (small asteroid, arc=9 days, H=25.8 ~23m) from Spacewatch 1.8m (Oct. 26.19-20p3)
- Observations of recently (no longer) risk-listed objects
- K11U63S 2011 US63 (Q=5.406 AU, arc=5 days, H=17.8 ~933m) from Walnut Creek Obs. (Oct. 26.17-20p4)
- K11T00K 2011 TK (Q=4.056 AU, arc=25 days, H=21.3 ~186m) from Walnut Creek Obs. (Oct. 26.13-15p3)
- Observations of small (H>22.0) & smallish (21.7<H<=22.0) asteroids
- K11UB5D 2011 UD115 (arc=3 days, H=22.4 ~112m) from Guidestar Obs. (Oct. 26.83-85p3) and San Marcello Pistoiese Obs. (Oct. 27.10-11p2)
- K11U91S 2011 US91 (arc=4 days, H=22.4 ~112m) from Chabot Obs. (Oct. 27.12-13p3)
- K11U64D 2011 UD64 (arc=4 days, H=25.4 ~28m) from Holmes/CTIO (Oct. 26.29-31p3)
- K11U64B 2011 UB64 (arc=4 days, H=25.0 ~34m) from Holmes/CTIO (Oct. 26.27-28p3)
- K11U63U 2011 UU63 (arc=5 days, H=24.3 ~47m) from Holmes/CTIO (Oct. 25.99-01p4) and Kevin Hills via RAS Obs. Moorook (Oct. 26.47-48p3)
- K11U63P 2011 UP63 (arc=7 days, H=23.9 ~56m) from San Marcello Pistoiese Obs. (Oct. 27.07-08p3)
- K11U00U 2011 UU (arc=9 days, H=23.0 ~85m) from PS1 (Oct. 26.42-47p3)
- K11UD1B 2011 UB131 (Q=5.384 AU, arc=3 days, H=21.8 ~148m) from Chabot Obs. (Oct. 27.11-15p3)
- K11U91P 2011 UP91 (arc=4 days, H=21.9 ~141m) from Holmes/CTIO (Oct. 26.04-05p3)
- Observations supporting planetary radar
- K04J02O 2004 JO2 (arc=3 opp, H=17.2 ~1.23 km, radar) from Hamamatsu-Yuto Obs. (Oct. 26.39-40p3) and Corner Obs. (Oct. 26.86p1 & 26.92p1)
- G3081 163081 2002 AG29 (radar) from Cordell-Lorenz Obs. (Oct. 25.30-32p2 & 26.31-33p2) and Hamamatsu-Yuto Obs. (Oct. 25.64-67p6)
Planetary radar schedules: Arecibo, Goldstone - Observations of other objects
- K11UA6U 2011 UU106 (arc=9 days, H=18.6 ~645m) from Guidestar Obs. (Oct. 26.86-88p3)
- K11U21G 2011 UG21 (arc=6 days, H=19.3 ~467m) from Holmes/CTIO (Oct. 26.02-03p4)
- K11U00D 2011 UD (arc=9 days, H=20.7 ~245m) from Walnut Creek Obs. (Oct. 26.21-22p3)
- K11T09N 2011 TN9 (arc=11 days, H=21.3 ~186m) from Cordell-Lorenz Obs. (Oct. 25.30-35p3 & 26.32-34p2) and Hamamatsu-Yuto Obs. (Oct. 25.55-56p4 & 26.53-57p4)
- K11T04A 2011 TA4 (Q=5.099 AU, arc=23 days, H=20.6 ~257m) from San Vito Obs. (Oct. 26.80p3)
- K11T02G 2011 TG2 (arc=23 days, H=20.4 ~282m) from Guidestar Obs. (Oct. 26.76-78p3)
- K11S69R 2011 SR69 (arc=32 days, H=20.0 ~339m) from Hamamatsu-Yuto Obs. (Oct. 25.74-76p3 & 26.67-69p7)
- K11Q13Z 2011 QZ13 (arc=66 days, H=20.1 ~323m) from Holmes/CTIO (Oct. 25.99-01p4)
- K11O05Q 2011 OQ5 (arc=93 days, H=19.5 ~426m) from the Spacewatch 0.9m telescope (Oct. 26.08-11p3) and Naef Obs. (Oct. 26.80-82p2)
- K11M11D 2011 MD11 (arc=122 days, H=17.9 ~891m) from LINEAR (Oct. 26.07-12p4)
- K11L19J 2011 LJ19 (Q=4.243 AU, arc=135 days, H=21.3 ~186m) from Andrushivka Obs. (Oct. 18.84-88p3)
- K11K04F 2011 KF4 (Q=4.198 AU, arc=157 days, H=19.1 ~513m) from Hamamatsu-Yuto Obs. (Oct. 26.60-61p3)
- K11H36C 2011 HC36 (arc=2 opp, H=20.7 ~245m) from PS1 (Oct. 26.37-41p3)
- K10J00F 2010 JF (i=43.8°, arc=2 opp, H=19.3 ~467m) from PS1 (Oct. 26.42-46p3 at w=22.4-5)
- K08U00X 2008 UX (q=0.260 AU, arc=2 opp, H=20.7 ~245m) from Spacewatch 0.9m (Oct. 26.25-29p3) and LINEAR (Oct. 26.26-30p5)
- K04U00L 2004 UL (q=0.093 AU, arc=6 opp, H=18.8 ~589m) from PS1 (Oct. 26.38-41p4)
- K04Q07J 2004 QJ7 (arc=3 opp, H=18.4 ~708m) from LINEAR (Oct. 26.13-17p4) and Hamamatsu-Yuto Obs. (Oct. 26.47-51p5)
- K00GE7G 2000 GG147 (arc=4 opp, H=18.2 ~776m) from Guidestar Obs. (Oct. 26.89-90p3)
- T7418 297418 2000 SP43 from San Vito Obs. (Oct. 26.84-85p3)
- S3460 283460 2001 PD1 from PS1 (Oct. 26.28-30p3) and Herrenberg Obs. (Oct. 26.77-78p5)
- L9071 219071 1997 US9 from Naef Obs. (Oct. 26.79-82p2)
- G3373 163373 2002 PZ39 from the Mt. Lemmon Survey (MLS) (Oct. 26.11-14p4)
- G2273 162273 1999 VL12 from ISON-NM Obs. (Oct. 26.35-39p4)
- F9399 159399 1998 UL1 from Herrenberg Obs. (Oct. 26.72-74p4)
- F5140 155140 2005 UD from Herrenberg Obs. (Oct. 26.82-83p5)
- D6923 136923 1998 JH2 from LINEAR (Oct. 26.31-36p5) and PS1 (Oct. 26.42-46p4)
- 42286 42286 2001 TN41 from LINEAR (Oct. 26.32-36p4)
- 37336 37336 2001 RM from San Vito Obs. (Oct. 26.77-78p2)
- 26760 26760 2001 KP41 from PS1 (Oct. 26.54-58p3)
- 16960 16960 1998 QS52 from San Vito Obs. (Oct. 26.78-79p3)
- 03988 3988 1986 LA from Hamamatsu-Yuto Obs. (Oct. 25.67-70p7) and An Carraig Obs. (Oct. 26.83-85p4)
- 03352 3352 McAuliffe (1981 CW) from LINEAR (Oct. 26.43-48p5)
MPEC 2011-U86 - "00:58 UT" - 2010 RO64
- K10R64O 2010 RO64 (KBO, q=41.060 AU, Q=53.409 AU, H=5.3 ~295 km) from Las Campanas Obs. (Oct. 20.05p1 at R=22.1, 20.19p1, 20.31p1, 21.04-06p2, 21.16p1, 23.06p1, 23.24p1 & 23.31p1)
Observers on 27 October '11
A total of 27 observers appear in today's MPECs.
| Code | Observer / observatory |
|---|---|
| J16 | An Carraig Obs. in Northern Ireland, 1 in MPEC 2011-U87 -- 3988 |
| A50 | Andrushivka Obs. in the Ukraine, 1 in MPEC 2011-U87 -- 2011 LJ19 |
| H21 | Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2011-U89 -- 2011 UV158 |
| 703 | Catalina Sky Survey in Arizona, 1 in MPEC 2011-U88 -- 2011 UU158 |
| 807| | Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPEC 2011-U87 -- 2011 UU63, 2011 UP91, 2011 UG21, 2011 UD64, 2011 UD21, 2011 UB64, 2011 QZ13 |
| G58 | Chabot Obs. in northern California, 2 in MPEC 2011-U87 -- 2011 US91, 2011 UB131 |
| 850 | Cordell-Lorenz Obs. in Tennessee, 2 in MPEC 2011-U87 -- 2011 TN9, 163081 |
| B50 | Corner Obs. in Germany, 1 in MPEC 2011-U87 -- 2004 JO2 |
| F65% | Tim Lister in southern California via Faulkes Telescope North in Hawaii, 2 in MPECs 2011-U89 & 2011-U90 -- 2011 UW158, 2011 UV158 |
| A17 | Guidestar Obs. in Germany, 4 in MPEC 2011-U87 -- 2011 UU106, 2011 UD115, 2011 TG2, 2000 GG147 |
| 379 | Hamamatsu-Yuto Obs. in Japan, 7 in MPEC 2011-U87 -- 2011 TN9, 2011 SR69, 2011 KF4, 2004 QJ7, 2004 JO2, 163081, 3988 |
| 240 | Herrenberg Obs. in Germany, 3 in MPEC 2011-U87 -- 283460, 159399, 155140 |
| H15 | ISON-NM Obs. in New Mexico, 1 in MPEC 2011-U87 -- 162273 |
| 704 | LINEAR in New Mexico, 6 in MPEC 2011-U87 -- 2011 MD11, 2008 UX, 2004 QJ7, 42286, 136923, 3352 |
| 304 | Las Campanas Obs. in Chile, 1 in MPEC 2011-U86 -- 2010 RO64 |
| 5682 | David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-U90 -- 2011 UW158 |
| G96 | Mt. Lemmon Survey in Arizona, 1 in MPEC 2011-U87 -- 163373 |
| A13 | Naef Obs. in Switzerland, 2 in MPEC 2011-U87 -- 2011 OQ5, 219071 |
| F51 | Pan-STARRS 1 (PS1) in Hawaii, 10 in MPECs 2011-U87, 2011-U88, 2011-U89 & 2011-U90 -- 2011 UW158, 2011 UV158, 2011 UU158, 2011 UU, 2011 HC36, 2010 JF, 2004 UL, 283460, 26760, 136923 |
| D90` | Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-U87 -- 2011 UU63 |
| 104 | San Marcello Pistoiese Obs. in Italy, 5 in MPECs 2011-U87 & 2011-U90 -- 2011 UW158, 2011 UP63, 2011 UL21, 2011 UD21, 2011 UD115 |
| 233 | San Vito Obs. in Italy, 4 in MPEC 2011-U87 -- 2011 TA4, 37336, 297418, 16960 |
| 691 | Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2011-U87 -- 2011 OQ5, 2008 UX |
| 291 | Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2011-U87 & 2011-U90 -- 2011 UW158, 2011 UT, 2011 UH20 |
| 926 | Tenagra II Obs. in Arizona, 1 in MPEC 2011-U90 -- 2011 UW158 |
| B18 | Terskol Obs. in Russia, 2 in MPECs 2011-U88 & 2011-U90 -- 2011 UW158, 2011 UU158 |
| G56 | Walnut Creek Obs. in northern California, 4 in MPEC 2011-U87 -- 2011 US63, 2011 UD21, 2011 UD, 2011 TK |
| For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page. | |
Impact Risk Monitoring on 27 October '11
| 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 |
| 2011 UV158 | JPL Sentry | 1622 | 2020-2111 | 57 | 6.7e-08 | -5.54 | -6.19 | 0 | JPL: "Analysis based on 10 observations spanning .80746 days (2011-Oct-24.54593 to 2011-Oct-25.353385)." Diameter approximately 0.130 km. from mean, weighted H=22.1. |
| 2011 UL21 | JPL Sentry | 1622 | 2029-2110 | 50 | 1.5e-06 | -0.82 | -1.41 | 1 | JPL: "Analysis based on 63 observations spanning 9.6661 days (2011-Oct-17.48272 to 2011-Oct-27.14884)." Diameter approximately 2.600 km. from mean, weighted H=15.6. |
| NEODyS | 1622 | 2032-2088 | 35 | 1.23e-06 | -0.90 | -1.67 | 1 | NEODyS: "Based on 63 optical observations (of which 0 are rejected as outliers) from 2011-10-17.483 to 2011-10-27.150." | |
| 2011 UD21 | JPL Sentry | 1622 | R E M O V E D | JPL: Risk listing removed at 0956 UTC. | |||||
| 2011 UH20 | JPL Sentry | 1622 | R E M O V E D | JPL: Risk listing removed at 0954 UTC. | |||||
| 2011 UT | JPL Sentry | 1622 | 2034-2109 | 7 | 4.7e-06 | -5.76 | -6.28 | 0 | JPL: "Analysis based on 64 observations spanning 8.7922 days (2011-Oct-17.41107 to 2011-Oct-26.20332)." Diameter approximately 0.025 km. from mean, weighted H=25.7. |
| NEODyS | 1622 | 2034-2085 | 3 | 1.25e-06 | -6.07 | -6.34 | 0 | NEODyS: "Based on 64 optical observations (of which 0 are rejected as outliers) from 2011-10-17.412 to 2011-10-26.204." | |
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 27 October '11
Times are UTC for when items were noted or added by The Tracking News.
| 1622 | Noted that JPL Sentry has removed 2011 UD21 as an impact risk - see above Noted that JPL Sentry has removed 2011 UH20 as an impact risk - see above Noted that JPL Sentry has updated its 2011 UL21 risk assessment - see above Noted that NEODyS has updated its 2011 UL21 risk assessment - see above Noted that JPL Sentry has updated its 2011 UT risk assessment - see above Noted that NEODyS has updated its 2011 UT risk assessment - see above Noted that JPL Sentry has posted 2011 UV158 as an impact risk - see above Grabbed MPEC 2011-U87 - Daily Orbit Update - see above Grabbed MPEC 2011-U88 - 2011 UU158 - see above Grabbed MPEC 2011-U89 - 2011 UV158 - see above Grabbed MPEC 2011-U90 - 2011 UW158 - see above |
| 0345 | Grabbed MPEC 2011-U86 - 2010 RO64 - see above |
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