30 Oct '07 Tracking News

Contents on 30 October '07

IAU Minor Planet Center
- NEOCP Activity -- four listings: 1 new, 3 updated
- New MPECs -- nine MPECs
- Observers -- 58 observing facilities
Impact Risk Monitoring -- three objects reported
Chronology

Resources:

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.

The latest news: framed access (best), RSS news feed (flags updates), or redirection - Note: A/CC has a main Web site and a backup site, which now has its own backup 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 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 October '07

The MPC's NEO Confirmation Page has 4 listings: 1 new, 3 updated

When last checked at 2242 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new and three updated listings. Of these, three were "one nighters." So far The Tracking News has counted a total of six 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 30 October '07

Minor Planet Electronic Circulars

As of last check at 2356 UTC, there have been nine MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2007-U86 time-stamped "06:08 UT" - Daily Orbit Update - see below
MPEC 2007-U87 time-stamped "15:09 UT" - Comet P/2007 R2 (Gibbs) - see below
MPEC 2007-U88 time-stamped "15:18 UT" - Comet C/2007 S2 (Lemmon) - see below
MPEC 2007-U89 time-stamped "15:26 UT" - Comet C/2007 T1 (McNaught) - see below
MPEC 2007-U90 time-stamped "15:31 UT" - Comet C/2007 T5 (Gibbs) - see below
MPEC 2007-U91 time-stamped "15:37 UT" - Comet P/2007 T6 (Catalina) - see below
MPEC 2007-U92 time-stamped "15:46 UT" - Comet C/2007 U1 (LINEAR) - see below
MPEC 2007-U93 time-stamped "15:59 UT" - Observations of Comets - see below
MPEC 2007-U94 time-stamped "20:55 UT" - 2007 US12

MPEC 2007-U94 - "20:55 UT" - 2007 US12

K07U12S 2007 US12 (borderline-small, Earth MOID=5.4 LD, H=21.9 ~141m) was discovered at 0704 UT on 30 Oct. by the Catalina Sky Survey (CSS), which observed it at Oct. 30.29-32p4, 30.38p4, and 30.45p4. The discovery was confirmed by Great Shefford Obs. (Oct. 30.82-83p3).

MPEC 2007-U93 - "15:59 UT" - Observations of Comets

PK07H010 P/2007 H1 (McNaught) from Montana Cabreja Obs. (Oct. 16.97-99p2), Kiev Comet Station (Oct. 17.95-98p7), Ageo Obs. (Oct. 20.56-57p2), Moriyama Obs. (Oct. 21.54p2), Rodeno Obs. (Oct. 26.94-96p3 & 28.84-85p3), Kambah Obs. (Oct. 27.54p2), Masquefa Obs. (Oct. 27.87-88p3), Murcia Obs. (Oct. 29.92p3), Monte Deva Obs. (Oct. 29.95-96p3), and La Mata Obs. (Oct. 29.97-98p3)
CK07G010 C/2007 G1 (LINEAR) from Nazaret Obs. (Oct. 22.85-87p3) and Montana Blanca Obs. (Oct. 23.83p1)
CK07E010 C/2007 E1 (Garradd) from LINEAR (Oct. 23.31-36p4 & 24.31-35p5)
PK07C020 P/2007 C2 (Catalina) from LINEAR (Oct. 22.43-48p5) and Gnosca Obs. (Oct. 23.17-20p3)
CK06U060 C/2006 U6 (Spacewatch) from Kambah Obs. (Oct. 29.51p2) and North Ryde Obs. (Oct. 30.45-48p2)
CK06S050 C/2006 S5 (Hill) from LINEAR (Oct. 23.43-48p5) and Masquefa Obs. (Oct. 28.07-08p7)
CK06O02F C/2006 OF2 (Broughton) from Montana Cabreja Obs. (Oct. 16.96-98p2), Ageo Obs. (Oct. 21.49-50p3), Moriyama Obs. (Oct. 21.53-54p2 & 24.44p2), Montcabre Obs. (Oct. 23.78p3), Ingenio Obs. (Oct. 23.89p5), Rodeno Obs. (Oct. 26.91-92p3 & 28.77-79p3), Vicksburg Obs. (Oct. 27.07-09p2, 28.11-13p2 & 29.07-08p2), Masquefa Obs. (Oct. 27.80-83p3), Hiratsuka Obs. (Oct. 28.42p3), La Mata Obs. (Oct. 29.90-92p3), Monte Deva Obs. (Oct. 29.93-95p5), and Red Barn Obs. (Oct. 30.07-10p7)
CK06M010 C/2006 M1 (LINEAR) from Ageo Obs. (Oct. 21.52p2), Moriyama Obs. (Oct. 21.60p2), and LINEAR (Oct. 24.31-35p5)
CK05EH3L C/2005 EL173 (LONEOS) from Kambah Obs. (Oct. 19.62-63p2 & 29.56p2) and the Siding Spring Survey (SSS) (Oct. 19.66p1)
0108P 108P/Ciffreo from CSS (Oct. 21.44-47p4), LINEAR (Oct. 24.44-48p3), and Ageo Obs. (Oct. 24.76p2)
0093P 93P/Lovas 1 from Remanzacco Obs. (Oct. 15.94p1), Siegen Obs. (Oct. 18.95p3 & 22.83p1), Vega del Thader Obs. (Oct. 19.81p4 & 19.87p1), Moriyama Obs. (Oct. 21.56p2), LINEAR (Oct. 23.25-30p5), Rodeno Obs. (Oct. 26.98-99p3 & 28.80-81p3), Mataro Obs. (Oct. 27.81p2 & 27.90p2), Montcabre Obs. (Oct. 27.88p3), Masquefa Obs. (Oct. 27.89-91p3), Vicksburg Obs. (Oct. 28.09-10p3 & 29.11-12p2), La Murta Obs. (Oct. 29.85p3), La Mata Obs. (Oct. 29.88-89p3), Murcia Obs. (Oct. 29.90p3), and Nazaret Obs. (Oct. 30.06p3)
0065P 65P/Gunn from CSS (Oct. 21.44-47p4) and LINEAR (Oct. 23.45-48p4)
0050P 50P/Arend from Vega del Thader Obs. (Oct. 19.88p3), Moriyama Obs. (Oct. 21.57-58p2), Atlante Obs. (Oct. 23.89-91p3), Montcabre Obs. (Oct. 27.86-87p3), Masquefa Obs. (Oct. 27.95-97p3), Rodeno Obs. (Oct. 28.82-84p3), Nazaret Obs. (Oct. 29.03-04p3 & 30.02-03p3), La Murta Obs. (Oct. 29.82-83p3), Trieste Obs. (Oct. 29.84p3), Murcia Obs. (Oct. 29.88p3), La Mata Obs. (Oct. 29.95p3), and Santa Pola Obs. (Oct. 29.95p2)
0046P 46P/Wirtanen from Montana Cabreja Obs. (Oct. 16.96-98p2), Kambah Obs. (Oct. 27.51p2), Hiratsuka Obs. (Oct. 28.44-45p3), and North Ryde Obs. (Oct. 29.44-48p2)
0029P 29P/Schwassmann-Wachmann 1 from Ageo Obs. (Oct. 10.78p1 & 23.69p1), Gualba Obs. (Oct. 24.18-19p2), Montcabre Obs. (Oct. 27.97-98p2), and Masquefa Obs. (Oct. 28.04-05p3)
0017P 17P/Holmes from Ageo Obs. (Oct. 21.59-60p2, 24.61-62p2 & 27.70-71p3), Atlante Obs. (Oct. 24.07-14p9), Nazaret Obs. (Oct. 24.07-13p11, 28.91-92p3 & 29.98-00p3), Montcabre Obs. (Oct. 24.09p3, 27.79-80p3, 28.76-78p3 & 29.87-89p4), Malaga Obs. (Oct. 24.12p2), Chante-Perdrix Obs. (Oct. 24.21p2, 26.79-80p3, 27.19-21p5, 28.20p1, 28.81p1, 29.20p1 & 30.23p1), RAS Obs. Mayhill (Oct. 24.34p2, 24.47-48p2, 25.46-47p2, 26.15p1, 26.40-42p2, 27.30p1 & 29.42-43p2), Petit Jean Mtn. South Obs. (PJMSO) (Oct. 25.12-17p10, 28.35-37p7, 29.03p1, 29.11-16p7 & 30.17-20p7), Table Mtn. Obs. (Oct. 26.39-43p4), Siegen Obs. (Oct. 26.79p3), Rodeno Obs. (Oct. 27.00p3, 27.87-88p3 & 28.82p3), Great Shefford Obs. (Oct. 27.11p1, 28.95p1, 29.93p1 & 30.09p1), Tosa Obs. (Oct. 27.47-51p3), Tradate Obs. (Oct. 27.81-89p3), Masquefa Obs. (Oct. 27.86p1, 27.93p1 & 28.02p1), Montseny Obs. (Oct. 27.92-97p22), Mataro Obs. (Oct. 27.92p3), Corbera Obs. (Oct. 27.98p9, 28.88p9 & 29.91p8), Four Winds Obs. (Oct. 28.12p2), Hiratsuka Obs. (Oct. 28.47p3), Lindenberg Obs. (Oct. 28.71-72p2), Ingenio Obs. (Oct. 28.87p3 & 29.92-94p4), Farpoint Obs. (Oct. 29.17-18p3), La Murta Obs. (Oct. 29.80p3), La Mata Obs. (Oct. 29.82p3), Kielce Obs. (Oct. 29.84-88p5), Murcia Obs. (Oct. 29.86p3), Monte Deva Obs. (Oct. 29.87p5), and La Puebla de Vallbona Obs. (Vallbona Obs.) (Oct. 29.89p3)

MPEC 2007-U92 - "15:46 UT" - Comet C/2007 U1 (LINEAR)

CK07U010 C/2007 U1 (LINEAR) (i=157.8°, q=3.338 AU, TP=2008 Aug. 7.074 TT) from RAS Mayhill (Oct. 22.39-43p2), Astronomical Research Obs. (ARO) (Oct. 22.42-44p3), LINEAR (Oct. 22.43-46p4, 23.42-47p3 & 24.44-47p4), Lulin Minor Bodies Tracking (LIMIT) (Oct. 22.79-84p3), Shenton Park Obs. (Oct. 22.81-85p3), Ageo Obs. (Oct. 23.76-78p2), and Montcabre Obs. (Oct. 28.11-13p3)

MPEC 2007-U91 - "15:37 UT" - Comet P/2007 T6 (Catalina)

PK07T060 P/2007 T6 (Catalina) (q=2.238 AU, Q=7.074 AU, TP=2007 Aug. 20.100 TT) from the Mt. Lemmon Survey (MLS) (Oct. 15.46-48p4, 25.44-46p4 & 26.44-47p4), Kiev Comet Station (Oct. 18.08-09p2), LINEAR (Oct. 20.43-48p5 & 22.43-48p5), and Farpoint Obs. (Oct. 23.44-45p3)

MPEC 2007-U90 - "15:31 UT" - Comet C/2007 T5 (Gibbs)

CK07T050 C/2007 T5 (Gibbs) (i=45.3°, q=4.189 AU, TP=2008 Apr. 29.673 TT) from Kiev Comet Station (Oct. 18.06p1), Farpoint Obs. (Oct. 23.43-44p3), and MLS (Oct. 25.44-46p4 & 26.43-46p4)

MPEC 2007-U89 - "15:26 UT" - Comet C/2007 T1 (McNaught)

CK07T010 C/2007 T1 (McNaught) (i=117.6°, q=0.969 AU, TP=2007 Dec. 12.519 TT) from Castlemaine Obs. (Oct. 12.46-48p3 & 14.41-42p3), Geisei Obs. (Oct. 21.39-41p3 & 23.40p1), Ageo Obs. (Oct. 28.37p3), and Hiratsuka Obs. (Oct. 28.38p3)

MPEC 2007-U88 - "15:18 UT" - Comet C/2007 S2 (Lemmon)

CK07S020 C/2007 S2 (Lemmon) (Centaur, q=5.539 AU, Q=19.234 AU, TP=2008 Sept. 22.9241 TT) from Kiev Comet Station (Oct. 18.07p1), LINEAR (Oct. 22.43-48p5), and MLS (Oct. 25.44-46p4 & 26.44-47p4)

MPEC 2007-U87 - "15:09 UT" - Comet P/2007 R2 (Gibbs)

PK07R020 P/2007 R2 (Gibbs) (q=1.466 AU, Q=5.416 AU, TP=2007 Aug. 26.6699 TT) from Kiev Comet Station (Oct. 18.04-05p3) and MLS (Oct. 24.32-34p4)

<< DOU on 30 Oct. '07 >> MPEC 2007-U86 - "06:08 UT" - Daily Orbit Update

Observations of risk-listed objects
K07U12N 2007 UN12 (small asteroid, arc=9 days, H=28.7 ~6m) from ARO (Oct. 28.13-15p3 & 29.19-20p3) and Great Shefford Obs. (Oct. 29.96-98p2)
K07U12L 2007 UL12 (q=0.385 AU, arc=5 days, H=20.5 ~269m) from ARO (Oct. 29.24-25p3) and Great Shefford Obs. (Oct. 30.10-13p3)
K07T72H 2007 TH72 (small asteroid, arc=13 days, H=24.2 ~49m) from Goodricke-Pigott Obs. (Oct. 12.21-22p2)
Observations of small asteroids (H>22.0)
K07U06P 2007 UP6 (arc=6 days, H=22.9 ~89m) from Greiner Research Obs. (Oct. 28.45-47p9)
K07U06G 2007 UG6 (arc=8 days, H=23.0 ~85m) from Tenagra II Obs. (Oct. 29.35p3)
K07U02C 2007 UC2 (arc=10 days, H=23.0 ~85m) from Madonna di Dossobuono Obs. (Oct. 19.86-87p3)
Observations of other objects
K07U12M 2007 UM12 (arc=3 days, H=21.6 ~162m) from ARO (Oct. 29.03-04p3) and Kanab Obs. (Oct. 29.14-17p3)
K07U06S 2007 US6 (arc=15 days, H=18.2 ~776m) from CSS (Oct. 14.45-46p4 & 21.36-39p4), Greiner Research Obs. (Oct. 29.02-04p9), and Tenagra II Obs. (Oct. 29.46p3)
K07U02A 2007 UA2 (arc=22 days, H=20.9 ~224m) from Tenagra II Obs. (Oct. 29.10-11p2)
K07T15G 2007 TG15 (arc=22 days, H=19.7 ~389m) from Madonna di Dossobuono Obs. (Oct. 29.87p3)
K07P11U 2007 PU11 (Q=4.384 AU, arc=3 opp, H=16.3 ~1.86 km) from Trieste Obs. (Oct. 29.86p3)
K07P08A 2007 PA8 (Q=4.701 AU, arc=2 opp, H=16.0 ~2.14 km, q=0.958 AU) from the Spacewatch 0.9m telescope (2004 April 24.29-32p2 & 2004 April 24.38p1)
K07L32R 2007 LR32 (arc=157 days, H=17.2 ~1.23 km) from Madonna di Dossobuono Obs. (Oct. 29.85-86p3)
K02RB8C 2002 RC118 (Q=4.624 AU, arc=2 opp, H=16.7 ~1.55 km) from Trieste Obs. (Oct. 29.91-92p3)

Observers on 30 October '07

A total of 58 observing facilities appear in today's MPECs.

Code	Observer / observatory
`349`	Ageo Obs. in Japan, 8 in MPECs 2007-U89, 2007-U92 & 2007-U93 -- C/2007 U1, C/2007 T1, P/2007 H1, C/2006 OF2, C/2006 M1, 108P, 29P, 17P
`H55`	Astronomical Research Obs. (ARO) in Illinois, 4 in MPECs 2007-U86 & 2007-U92 -- 2007 UN12, 2007 UM12, 2007 UL12, C/2007 U1
`J51`	Atlante Obs. in the Canary Islands, 2 in MPEC 2007-U93 -- 50P, 17P
`E00`	Castlemaine Obs., 1 in MPEC 2007-U89 -- C/2007 T1
`703`	Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2007-U86, 2007-U93 & 2007-U94 -- 2007 US6, 2007 US12, 108P, 65P
`A77`	Chante-Perdrix Obs. in France, 1 in MPEC 2007-U93 -- 17P
`A10`	Corbera Obs. in Spain, 1 in MPEC 2007-U93 -- 17P
`734`	Farpoint Obs. in Kansas, 3 in MPECs 2007-U90, 2007-U91 & 2007-U93 -- P/2007 T6, C/2007 T5, 17P
`762`	Four Winds Obs. in Michigan, 1 in MPEC 2007-U93 -- 17P
`372`	Geisei Obs. in Japan, 1 in MPEC 2007-U89 -- C/2007 T1
`143`	Gnosca Obs. in Switzerland, 1 in MPEC 2007-U93 -- P/2007 C2
`683`	Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2007-U86 -- 2007 TH72
`J95`	Great Shefford Obs. in England, 4 in MPECs 2007-U86, 2007-U93 & 2007-U94 -- 2007 US12, 2007 UN12, 2007 UL12, 17P
`H51`	Greiner Research Obs. in Wisconsin, 2 in MPEC 2007-U86 -- 2007 US6, 2007 UP6
`442`	Gualba Obs. in Spain, 1 in MPEC 2007-U93 -- 29P
`D88`	Hiratsuka Obs., 4 in MPECs 2007-U89 & 2007-U93 -- C/2007 T1, C/2006 OF2, 46P, 17P
`J39`	Ingenio Obs., 2 in MPEC 2007-U93 -- C/2006 OF2, 17P
`415`	Kambah Obs. in Australia, 4 in MPEC 2007-U93 -- P/2007 H1, C/2006 U6, C/2005 EL173, 46P
`682`	Kanab Obs. in Utah, 1 in MPEC 2007-U86 -- 2007 UM12
`B02`	Kielce Obs. in Poland, 1 in MPEC 2007-U93 -- 17P
`585`	Kiev Comet Station in the Ukraine, 5 in MPECs 2007-U87, 2007-U88, 2007-U90, 2007-U91 & 2007-U93 -- P/2007 T6, C/2007 T5, C/2007 S2, P/2007 R2, P/2007 H1
`704`	LINEAR in New Mexico, 10 in MPECs 2007-U88, 2007-U91, 2007-U92 & 2007-U93 -- C/2007 U1, P/2007 T6, C/2007 S2, C/2007 E1, P/2007 C2, C/2006 S5, C/2006 M1, 108P, 93P, 65P
`J64`	La Mata Obs. in Spain, 5 in MPEC 2007-U93 -- P/2007 H1, C/2006 OF2, 93P, 50P, 17P
`J76`	La Murta Obs. in Spain, 3 in MPEC 2007-U93 -- 93P, 50P, 17P
`J67`	La Puebla de Vallbona Obs. in Spain, 1 in MPEC 2007-U93 -- 17P
`A80`	Lindenberg Obs. in Germany, 1 in MPEC 2007-U93 -- 17P
`D35`	Lulin Minor Bodies Tracking in Taiwan, 1 in MPEC 2007-U92 -- C/2007 U1
`560`	Madonna di Dossobuono Obs. in Italy, 3 in MPEC 2007-U86 -- 2007 UC2, 2007 TG15, 2007 LR32
`J40`	Malaga Obs. in Spain, 1 in MPEC 2007-U93 -- 17P
`232`	Masquefa Obs. in Spain, 7 in MPEC 2007-U93 -- P/2007 H1, C/2006 S5, C/2006 OF2, 93P, 50P, 29P, 17P
`A06`	Mataro Obs. in Spain, 2 in MPEC 2007-U93 -- 93P, 17P
`J46`	Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2007-U93 -- C/2007 G1
`J45`	Montana Cabreja Obs. in the Canary Islands, 3 in MPEC 2007-U93 -- P/2007 H1, C/2006 OF2, 46P
`213`	Montcabre Obs. in Spain, 6 in MPECs 2007-U92 & 2007-U93 -- C/2007 U1, C/2006 OF2, 93P, 50P, 29P, 17P
`945`	Monte Deva Obs. in Spain, 3 in MPEC 2007-U93 -- P/2007 H1, C/2006 OF2, 17P
`B06`	Montseny Obs., 1 in MPEC 2007-U93 -- 17P
`900`	Moriyama Obs. in Japan, 5 in MPEC 2007-U93 -- P/2007 H1, C/2006 OF2, C/2006 M1, 93P, 50P
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2007-U87, 2007-U88, 2007-U90 & 2007-U91 -- P/2007 T6, C/2007 T5, C/2007 S2, P/2007 R2
`J78`	Murcia Obs. in Spain, 4 in MPEC 2007-U93 -- P/2007 H1, 93P, 50P, 17P
`J47`	Nazaret Obs. in Spain, 4 in MPEC 2007-U93 -- C/2007 G1, 93P, 50P, 17P
`423`	North Ryde Obs. in New South Wales, 2 in MPEC 2007-U93 -- C/2006 U6, 46P
`H45`	Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2007-U93 -- 17P
`H06`	RAS Obs. Mayhill in New Mexico, 2 in MPECs 2007-U92 & 2007-U93 -- C/2007 U1, 17P
`H68`	Red Barn Obs. in Georgia, 1 in MPEC 2007-U93 -- C/2006 OF2
`473`	Remanzacco Obs. in Italy, 1 in MPEC 2007-U93 -- 93P
`939`	Rodeno Obs. in Spain, 5 in MPEC 2007-U93 -- P/2007 H1, C/2006 OF2, 93P, 50P, 17P
`J49`	Santa Pola Obs. in Spain, 1 in MPEC 2007-U93 -- 50P
`D21`	Shenton Park Obs. in Western Australia, 1 in MPEC 2007-U92 -- C/2007 U1
`E12`	Siding Spring Survey in New South Wales, 1 in MPEC 2007-U93 -- C/2005 EL173
`510`	Siegen Obs. in Germany, 2 in MPEC 2007-U93 -- 93P, 17P
`691`	Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2007-U86 -- 2007 PA8
`673`	Table Mtn. Obs. in southern California, 1 in MPEC 2007-U93 -- 17P
`926`	Tenagra II Obs. in Arizona, 3 in MPEC 2007-U86 -- 2007 US6, 2007 UG6, 2007 UA2
`D70`	Tosa Obs., 1 in MPEC 2007-U93 -- 17P
`B39`	Tradate Obs. in Italy, 1 in MPEC 2007-U93 -- 17P
`A82`	Trieste Obs., 3 in MPECs 2007-U86 & 2007-U93 -- 2007 PU11, 2002 RC118, 50P
`J70`	Vega del Thader Obs. in Spain, 2 in MPEC 2007-U93 -- 93P, 50P
`H47`	Vicksburg Obs. in Mississippi, 2 in MPEC 2007-U93 -- C/2006 OF2, 93P

Impact Risk Monitoring on 30 October '07

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2356 UTC)
See the CRT page for a list of all objects rated recently as risks.
Note that the time horizon for JPL is 100 years from today and for NEODyS is now usually the year 2090.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON (backup) risk pages.
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

2007 UN12	NEODyS	1409	2069-2090	26	6.88e-05	-6.38	-7.14	0	NEODyS: "Based on 63 optical observations (of which 0 are rejected as outliers) from 2007/10/21.373 to 2007/10/29.979."
2007 UN12	JPL Sentry	1126	2071-2107	26	2.0e-04	-5.99	-6.89	0	JPL: "Analysis based on 63 observations spanning 8.6057 days (2007-Oct-21.37247 to 2007-Oct-29.9782)." Diameter approximately 0.006 km. from mean, weighted H=28.7.

2007 UL12	JPL Sentry	1126	2094	2	6.0e-09	-5.85	-5.86	0	JPL: "Analysis based on 28 observations spanning 4.6554 days (2007-Oct-25.47694 to 2007-Oct-30.13237)." Diameter approximately 0.280 km. from mean, weighted H=20.4.

2007 TH72	NEODyS	1409	2087	1	4.19e-09	-8.08	-8.08	0	NEODyS: "Based on 37 optical observations (of which 1 are rejected as outliers) from 2007/10/12.211 to 2007/10/28.219."

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 30 October '07

Times are UTC for when the items were noted or added by The Tracking News.

2124	Grabbed MPEC 2007-U94 - 2007 US12 - see above
1759	Grabbed MPEC 2007-U87 - Comet P/2007 R2 (Gibbs) - see above Grabbed MPEC 2007-U88 - Comet C/2007 S2 (Lemmon) - see above Grabbed MPEC 2007-U89 - Comet C/2007 T1 (McNaught) - see above Grabbed MPEC 2007-U90 - Comet C/2007 T5 (Gibbs) - see above Grabbed MPEC 2007-U91 - Comet P/2007 T6 (Catalina) - see above Grabbed MPEC 2007-U92 - Comet C/2007 U1 (LINEAR) - see above Grabbed MPEC 2007-U93 - Observations of Comets - see above
1409	Noted that NEODyS has updated its 2007 TH72 risk assessment - see above Noted that NEODyS has posted 2007 UN12 as an impact risk - see above
1126	Noted that JPL Sentry has updated its 2007 UL12 risk assessment - see above Noted that JPL Sentry has updated its 2007 UN12 risk assessment - see above Grabbed MPEC 2007-U86 - Daily Orbit Update - see above The NEOCP has become active
0234	The NEOCP has become empty

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