19 Oct '07 Tracking News

Contents on 19 October '07

IAU Minor Planet Center
- NEOCP Activity -- eleven listings: 6 new, 5 updated
- New MPECs -- twelve MPECs
- Observers -- 22 observing facilities
Impact Risk Monitoring -- nine 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: Marching toward complete automation, we have inaugurated on October 18th an RSS news feed that is generated from the same scripts used to produce these daily news pages, replacing previously manual RSS creation. This provides faster and more complex (and surer) linking to both the related A/CC news items and, when available, now also to the original documents. And so this means not only an RSS news feed for A/CC reporting but also for MPECs and active risk assessments. Additionally, this change allows providing an alternate RSS feed for daily news as published on A/CC's backup Web site.

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 19 October '07

The MPC's NEO Confirmation Page has 11 listings: 6 new, 5 updated

When last checked at 2355 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had six new and five updated listings. Of these, ten were "one nighters." So far The Tracking News has counted a total of nineteen 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 19 October '07

Minor Planet Electronic Circulars

As of last check at 2355 UTC, there have been twelve MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2007-U25 time-stamped "06:12 UT" - Daily Orbit Update - see below
MPEC 2007-U26 time-stamped "14:49 UT" - Comet P/2007 T2 (Kowalski) - see below
MPEC 2007-U27 time-stamped "16:45 UT" - 2007 UW1 - see below
MPEC 2007-U28 time-stamped "16:47 UT" - 2007 UX1 - see below
MPEC 2007-U29 time-stamped "16:50 UT" - 2007 UY1 - see below
MPEC 2007-U30 time-stamped "16:52 UT" - 2007 UZ1 - see below
MPEC 2007-U31 time-stamped "16:56 UT" - 2007 UA2 - see below
MPEC 2007-U32 time-stamped "16:58 UT" - 2007 UB2 - see below
MPEC 2007-U33 time-stamped "17:00 UT" - 2007 UC2 - see below
MPEC 2007-U34 time-stamped "19:58 UT" - Comets C/2007 Q4, 2007 Q5, 2007 Q6, 2007 Q7 (SOHO) - see below
MPEC 2007-U35 time-stamped "20:03 UT" - Comets C/2007 Q8, 2007 Q9, 2007 R6, 2007 R7 (SOHO) - see below
MPEC 2007-U36 time-stamped "21:56 UT" - Comets C/2007 R8, 2007 R9, 2007 R10, 2007 S3, 2007 S4 (SOHO)

MPEC 2007-U36 - "21:56 UT" - Comets C/2007 R8, 2007 R9, 2007 R10, 2007 S3, 2007 S4 (SOHO)

CK07S040 C/2007 S4 from the LASCO Coronagraph 3 on the Solar & Heliospheric Obs. (SOHO) (Sept. 23.76-78p4, 23.82-93p12 & 23.97-03p6) and the LASCO Coronagraph 2 on the Solar & Heliospheric Obs. (SOHO) (Sept. 24.06-09p6)
CK07S030 C/2007 S3 from SOHO C3 (Sept. 16.11-18p8 & 16.22-40p16)
CK07R100 C/2007 R10 from SOHO C2 (Sept. 14.94-02p12)
CK07R090 C/2007 R9 from SOHO C3 (Sept. 13.45-53p10 & 13.57-76p20)
CK07R080 C/2007 R8 from SOHO C3 (Sept. 9.86-93p8 & 9.97-20p22)

MPEC 2007-U35 - "20:03 UT" - Comets C/2007 Q8, 2007 Q9, 2007 R6, 2007 R7 (SOHO)

CK07R070 C/2007 R7 from SOHO C3 (Sept. 8.32p2, 8.36p2, 8.40-47p8 & 8.51-53p4) and SOHO C2 (Sept. 8.62-63p4)
CK07R060 C/2007 R6 from SOHO C2 (Sept. 1.07-13p16)
CK07Q090 C/2007 Q9 from SOHO C3 (Aug. 28.99p2 & 29.18-22p6)
CK07Q080 C/2007 Q8 from SOHO C3 (Aug. 28.60-68p10, 28.72p2, 28.93p2, 28.99p2 & 29.18-22p6)

MPEC 2007-U34 - "19:58 UT" - Comets C/2007 Q4, 2007 Q5, 2007 Q6, 2007 Q7 (SOHO)

CK07Q070 C/2007 Q7 from SOHO C3 (Aug. 25.10-11p4, 25.18p2, 25.22-32p12, 25.36p2, 25.40-53p14 & 25.57-86p28)
CK07Q060 C/2007 Q6 from SOHO C3 (Aug. 17.53p2 & 17.57-93p36)
CK07Q050 C/2007 Q5 from SOHO C3 (Aug. 17.26-28p4, 17.32-53p22 & 17.57-93p36)
CK07Q040 C/2007 Q4 from SOHO C3 (Aug. 17.24-28p6, 17.32-53p22 & 17.57-99p40)

MPEC 2007-U33 - "17:00 UT" - 2007 UC2

K07U02C 2007 UC2 (small asteroid, H=22.9 ~89m) was discovered at 0711 UT on 18 Oct. by the Catalina Sky Survey (CSS), which observed it at Oct. 18.30-36p7 and 19.20-23p4. The discovery was confirmed by Grasslands Obs. (Oct. 18.34p3), Jim Young via Table Mtn. Obs. (Oct. 19.18-21p4), the Mt. Lemmon Survey (MLS) (Oct. 19.23p4), and Bisei Spaceguard Center (Bisei) (Oct. 19.51p4).

MPEC 2007-U32 - "16:58 UT" - 2007 UB2

K07U02B 2007 UB2 (H=21.5 ~170m) was discovered at 0642 UT on 18 Oct. by the MLS, which observed it at Oct. 18.28-30p4, 18.34-35p3, and 19.30-37p8 at V=22.1-7. The discovery was confirmed by the Spacewatch 1.8m telescope (Oct. 18.40-41p3 & 19.32-33p3).

MPEC 2007-U31 - "16:56 UT" - 2007 UA2

K07U02A 2007 UA2 (H=20.9 ~224m) was discovered at 0640 UT on 18 Oct. by the MLS, which observed it at Oct. 7.34-35p4, 18.28-29p4, 18.34-35p4, and 19.30-32p4. The discovery was confirmed by Spacewatch 1.8m (Oct. 18.38-39p3 & 19.17p3).

MPEC 2007-U30 - "16:52 UT" - 2007 UZ1

K07U01Z 2007 UZ1 (Q=4.384 AU, H=21.4 ~178m) was discovered at 0603 UT on 18 Oct. by the MLS, which observed it at Oct. 18.25-33p8 and 19.27-29p4. The discovery was confirmed by Grasslands Obs. (Oct. 18.31-32p3), Spacewatch 1.8m (Oct. 19.15-16p3), and Young/Table Mtn. (Oct. 19.22-24p4).

MPEC 2007-U29 - "16:50 UT" - 2007 UY1

K07U01Y 2007 UY1 (risk-listed, Earth MOID=2.8 LD, H=23.1 ~81m) was discovered at 0341 UT on 18 Oct. by the CSS, which observed it at Oct. 18.15-18p4 and 18.23-25p4. The discovery was confirmed by LINEAR (Oct. 18.14-18p4), Grasslands Obs. (Oct. 18.25-26p3), MLS (Oct. 19.13p4 & 19.22-23p4), and Young/Table Mtn. (Oct. 19.13-15p4).

MPEC 2007-U28 - "16:47 UT" - 2007 UX1

K07U01X 2007 UX1 (H=20.4 ~282m) was discovered at 1058 UT on 17 Oct. by the CSS, which observed it at Oct. 17.38-41p4 and 17.46-48p4. The discovery was confirmed by Spacewatch 1.8m (Oct. 18.44-45p3), MLS (Oct. 18.45-46p4 & 19.41-42p3), and Young/Table Mtn. (Oct. 19.43-45p4).

MPEC 2007-U27 - "16:45 UT" - 2007 UW1

K07U01W 2007 UW1 (risk-listed, Earth MOID=0.5 LD, H=22.7 ~98m) was discovered at 1037 UT on 17 Oct. by LONEOS, which observed it at Oct. 17.44-48p4. The discovery was confirmed by CSS (Oct. 17.52p2 & 18.52-53p8), Grasslands Obs. (Oct. 18.35-36p3), Farra d'Isonzo Obs. (Oct. 19.07-08p2), Magdalena Ridge Obs. (MRO) (Oct. 19.42-43p5), and Young/Table Mtn. (Oct. 19.46-48p4).

MPEC 2007-U26 - "14:49 UT" - Comet P/2007 T2 (Kowalski)

PK07T020 P/2007 T2 (Kowalski) (q=0.696 AU, Q=5.500 AU, TP=2007 Sept. 19.037 TT) from Cordell-Lorenz Obs. (Oct. 15.41-44p2), MLS (Oct. 15.47-48p4 & 19.48-49p4), and Kiev Comet Station (Oct. 17.10p3)

<< DOU on 19 Oct. '07 >> MPEC 2007-U25 - "06:12 UT" - Daily Orbit Update

Observations of risk-listed objects
K07T72H 2007 TH72 (small asteroid, arc=4 days, H=24.3 ~47m) from Spacewatch 1.8m (Oct. 19.21-22p3)
K07T71D 2007 TD71 (i=49.4°, arc=5 days, H=18.4 ~708m) from the Siding Spring Survey (SSS) (Oct. 18.51p1 & 18.73p1)
K07T24U 2007 TU24 (arc=8 days, H=20.1 ~323m) from Spacewatch 1.8m (Oct. 19.19-20p3)
K07T23B 2007 TB23 (i=38.4°, arc=8 days, H=18.7 ~616m) from Spacewatch 1.8m (Oct. 18.23p3)
K07T16L 2007 TL16 (small asteroid, arc=9 days, H=26.2 ~19m) from Spacewatch 1.8m (Oct. 18.34-36p3)
K07T14C 2007 TC14 (small asteroid, arc=8 days, H=22.2 ~123m) from Peschiera del Garda Obs. (Oct. 13.87-91p5)
Observations of recently (no longer) risk-listed objects
K07U00H 2007 UH (almost small, arc=2 days, H=22.0 ~135m) from the Spacewatch 0.9m telescope (Oct. 18.32-36p3)
K07T18V 2007 TV18 (small asteroid, arc=8 days, H=23.5 ~68m) from Astronomical Research Obs. (ARO) (Oct. 17.03p2)
K07T18U 2007 TU18 (small asteroid, Q=4.016 AU, arc=10 days, H=25.1 ~32m) from Shenton Park Obs. (Oct. 18.76p3)
K07T15L 2007 TL15 (small asteroid, arc=9 days, H=24.3 ~47m) from ARO (Oct. 17.18-20p3 at V=22.1)
K07T14B 2007 TB14 (small asteroid, Q=4.092 AU, arc=10 days, H=24.4 ~45m) from Spacewatch 0.9m (Oct. 18.27-31p3)
K07T01G 2007 TG1 (small asteroid, arc=14 days, H=24.5 ~43m) from ARO (Oct. 17.10-11p3) and Spacewatch 1.8m (Oct. 18.25p3)
Observations of small asteroids (H>22.0)
K07T74N 2007 TN74 (arc=3 days, H=25.6 ~26m) from ARO (Oct. 17.18-19p3)
K07T71H 2007 TH71 (arc=4 days, H=26.5 ~17m) from KLENOT (Oct. 16.77p4)
K07T24X 2007 TX24 (arc=6 days, H=25.0 ~34m) from ARO (Oct. 17.20-21p3)
K07T01D 2007 TD1 (arc=13 days, H=25.5 ~27m) from Spacewatch 0.9m (Oct. 11.28-32p3) and ARO (Oct. 17.23-24p3)
K07S11G 2007 SG11 (arc=20 days, H=22.6 ~102m) from Peschiera del Garda Obs. (Oct. 2.89p5)
K07R17R 2007 RR17 (arc=35 days, H=23.6 ~65m) from ARO (Oct. 17.27-28p3) and Spacewatch 0.9m (Oct. 18.44-48p3)
K07R12S 2007 RS12 (arc=36 days, H=23.2 ~78m) from Spacewatch 1.8m (Oct. 18.26-27p2)
K07R12P 2007 RP12 (arc=36 days, H=24.6 ~41m) from ARO (Oct. 17.13-15p3)
K07R08Z 2007 RZ8 (arc=38 days, H=23.8 ~59m) from ARO (Oct. 17.03-04p3)
Observations of other objects
K07T68W 2007 TW68 (arc=4 days, H=19.2 ~490m) from ARO (Oct. 17.22-26p4)
K07T65R 2007 TR65 (i=43.5°, arc=6 days, H=18.9 ~562m) from CSS (Oct. 18.26-28p4) and Shenton Park Obs. (Oct. 18.65-66p3)
K07T19J 2007 TJ19 (i=40.9°, arc=8 days, H=21.0 ~214m) from LINEAR (Oct. 18.20-30p10) and Shenton Park Obs. (Oct. 18.64p2)
K07T19A 2007 TA19 (arc=9 days, H=19.6 ~407m) from SSS (Oct. 18.39-40p2 & 18.72p1) and Shenton Park Obs. (Oct. 18.58-59p3)
K07T08G 2007 TG8 (Q=4.309 AU, arc=34 days, H=18.8 ~589m) from Peschiera del Garda Obs. (Oct. 15.87-89p3)
K07S02V 2007 SV2 (arc=27 days, H=21.0 ~214m) from ARO (Oct. 17.01-02p3)
K07RE7T 2007 RT147 (arc=37 days, H=18.2 ~776m) from LINEAR (Oct. 18.14-19p5) and CSS (Oct. 18.26-29p4)
K07RD3L 2007 RL133 (arc=33 days, H=20.3 ~295m) from ARO (Oct. 17.12-13p3)
K07R17U 2007 RU17 (q=0.356 AU, arc=35 days, H=18.2 ~776m) from LINEAR (Oct. 18.20-25p5)
K07R05F 2007 RF5 (arc=42 days, H=18.4 ~708m) from Peschiera del Garda Obs. (Oct. 15.92-93p3)
K07R01T 2007 RT1 (arc=43 days, H=20.6 ~257m) from ARO (Oct. 17.06-10p3 at V=23.1-2)
K07Q02K 2007 QK2 (arc=56 days, H=20.6 ~257m) from Spacewatch 0.9m (Oct. 11.10-13p3)
K07P11U 2007 PU11 (Q=4.384 AU, arc=3 opp, H=16.3 ~1.86 km) from Spacewatch 0.9m (Oct. 18.32-36p3), Hamamatsu-Yuto Obs. (Oct. 18.65-66p7), and Mandi Obs. (Oct. 18.93-94p3)
K07O00V 2007 OV (arc=93 days, H=19.3 ~467m) from Peschiera del Garda Obs. (Oct. 2.91-94p3)
K07L32R 2007 LR32 (arc=146 days, H=17.2 ~1.23 km) from Hamamatsu-Yuto Obs. (Oct. 18.57-60p4)
K07D41A 2007 DA41 (arc=3 opp, H=17.6 ~1.02 km) from Peschiera del Garda Obs. (Oct. 7.85-86p3) and Begues Obs. (Oct. 18.81p3)
K05S00G 2005 SG (arc=4 opp, H=19.0 ~537m) from Mandi Obs. (Oct. 18.95-97p3)
K04K01E 2004 KE1 (arc=2 opp, H=21.6 ~162m) from LINEAR (Oct. 18.26-30p5)
K02U31A 2002 UA31 (arc=4 opp, H=19.0 ~537m) from CSS (Oct. 18.12-15p3) and Begues Obs. (Oct. 18.80p3)
K02S00V 2002 SV (arc=2 opp, H=19.8 ~371m) from CSS (Oct. 18.13-15p3)
K02RB8C 2002 RC118 (Q=4.624 AU, arc=2 opp, H=16.7 ~1.55 km) from Hamamatsu-Yuto Obs. (Oct. 18.62-64p3)
J93T02Q 1993 TQ2 (arc=2 opp, H=20.0 ~339m) from Spacewatch 0.9m (Oct. 18.44-48p3)
G3760 163760 2003 OR14 from LINEAR (Oct. 18.14-19p4)
G1998 161998 1988 PA from LINEAR (Oct. 18.31-36p5)
F4278 154278 2002 TB9 from LINEAR (Oct. 18.31-36p5)
E4900 144900 2004 VG64 from LINEAR (Oct. 18.38-42p5)
87309 87309 2000 QP from CSS (Oct. 18.07-09p4)
85839 85839 1998 YO4 from MLS (Oct. 18.49-51p4)
53426 53426 1999 SL5 from Begues Obs. (Oct. 18.83p3)
21374 21374 1997 WS22 from LINEAR (Oct. 18.37-42p5) and CSS (Oct. 18.39-41p4)
21277 21277 1996 TO5 from LONEOS (Oct. 18.09-14p4)
16636 16636 1993 QP from CSS (Oct. 18.29-31p4)
06489 6489 Golevka (1991 JX) from MLS (Oct. 18.31-33p4)
03288 3288 Seleucus (1982 DV) from CSS (Oct. 18.45-47p4)
02212 2212 Hephaistos (1978 SB) from LONEOS (Oct. 18.24-31p4)
01036 1036 Ganymed (1924 TD) from LINEAR (Oct. 18.43-48p5)

Observers on 19 October '07

A total of 22 observing facilities appear in today's MPECs.

Code	Observer / observatory
`H55`	Astronomical Research Obs. (ARO) in Illinois, 13 in MPEC 2007-U25 -- 2007 TX24, 2007 TW68, 2007 TV18, 2007 TN74, 2007 TL15, 2007 TG1, 2007 TD1, 2007 SV2, 2007 RZ8, 2007 RT1, 2007 RR17, 2007 RP12, 2007 RL133
`170`	Begues Obs. in Spain, 3 in MPEC 2007-U25 -- 2007 DA41, 2002 UA31, 53426
`300`	Bisei Spaceguard Center in Japan, 1 in MPEC 2007-U33 -- 2007 UC2
`703`	Catalina Sky Survey (CSS) in Arizona, 12 in MPECs 2007-U25, 2007-U27, 2007-U28, 2007-U29 & 2007-U33 -- 2007 UY1, 2007 UX1, 2007 UW1, 2007 UC2, 2007 TR65, 2007 RT147, 2002 UA31, 2002 SV, 87309, 21374, 16636, 3288
`850`	Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2007-U26 -- P/2007 T2
`595`	Farra d'Isonzo Obs. in Italy, 1 in MPEC 2007-U27 -- 2007 UW1
`651`	Grasslands Obs. in Arizona, 4 in MPECs 2007-U27, 2007-U29, 2007-U30 & 2007-U33 -- 2007 UZ1, 2007 UY1, 2007 UW1, 2007 UC2
`379`	Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2007-U25 -- 2007 PU11, 2007 LR32, 2002 RC118
`246`	KLENOT in the Czech Republic, 1 in MPEC 2007-U25 -- 2007 TH71
`585`	Kiev Comet Station in the Ukraine, 1 in MPEC 2007-U26 -- P/2007 T2
`704`	LINEAR in New Mexico, 11 in MPECs 2007-U25 & 2007-U29 -- 2007 UY1, 2007 TJ19, 2007 RU17, 2007 RT147, 2004 KE1, 21374, 163760, 161998, 154278, 144900, 1036
`699`	LONEOS in Arizona, 3 in MPECs 2007-U25 & 2007-U27 -- 2007 UW1, 21277, 2212
`H01`	Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2007-U27 -- 2007 UW1
`B28`	Mandi Obs. in Italy, 2 in MPEC 2007-U25 -- 2007 PU11, 2005 SG
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2007-U25, 2007-U26, 2007-U28, 2007-U29, 2007-U30, 2007-U31, 2007-U32 & 2007-U33 -- 2007 UZ1, 2007 UY1, 2007 UX1, 2007 UC2, 2007 UB2, 2007 UA2, P/2007 T2, 85839, 6489
`A53`	Peschiera del Garda Obs. in Italy, 6 in MPEC 2007-U25 -- 2007 TG8, 2007 TC14, 2007 SG11, 2007 RF5, 2007 OV, 2007 DA41
`D21`	Shenton Park Obs. in Western Australia, 4 in MPEC 2007-U25 -- 2007 TU18, 2007 TR65, 2007 TJ19, 2007 TA19
`E12`	Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2007-U25 -- 2007 TD71, 2007 TA19
`2492`	LASCO Coronagraph 2 (SOHO C2) via the Solar & Heliospheric Obs. (SOHO) in Earth-Sun L1 HALO orbit, 4 in MPECs 2007-U35 & 2007-U36 -- C/2007 S4, C/2007 R7, C/2007 R6, C/2007 R10
`2493`	LASCO Coronagraph 3 (SOHO C3) via the Solar & Heliospheric Obs. (SOHO) in Earth-Sun L1 HALO orbit, 11 in MPECs 2007-U34, 2007-U35 & 2007-U36 -- C/2007 S4, C/2007 S3, C/2007 R9, C/2007 R8, C/2007 R7, C/2007 Q9, C/2007 Q8, C/2007 Q7, C/2007 Q6, C/2007 Q5, C/2007 Q4
`691`	Spacewatch 0.9m telescope in Arizona, 7 in MPEC 2007-U25 -- 2007 UH, 2007 TD1, 2007 TB14, 2007 RR17, 2007 QK2, 2007 PU11, 1993 TQ2
`291`	Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2007-U25, 2007-U28, 2007-U30, 2007-U31 & 2007-U32 -- 2007 UZ1, 2007 UX1, 2007 UB2, 2007 UA2, 2007 TU24, 2007 TL16, 2007 TH72, 2007 TG1, 2007 TB23, 2007 RS12
`6735`	Jim Young via Table Mtn. Obs. in southern California, 5 in MPECs 2007-U27, 2007-U28, 2007-U29, 2007-U30 & 2007-U33 -- 2007 UZ1, 2007 UY1, 2007 UX1, 2007 UW1, 2007 UC2

Impact Risk Monitoring on 19 October '07

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2355 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 UY1	JPL Sentry	2259	2043-2107	45	6.5e-07	-5.62	-5.95	0	JPL: "Analysis based on 26 observations spanning 1.0811 days (2007-Oct-18.14415 to 2007-Oct-19.22523)." Diameter approximately 0.085 km. from mean, weighted H=23.0.

2007 UW1	JPL Sentry	2355	2048-2106	94	1.6e-04	-3.12	-3.43	0	JPL: "Analysis based on 28 observations spanning 2.0396 days (2007-Oct-17.44246 to 2007-Oct-19.48208)." Diameter approximately 0.097 km. from mean, weighted H=22.7.

2007 US	NEODyS	1510	2015-2090	20	5.46e-09	-7.14	-7.38	0	NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2007/10/16.242 to 2007/10/17.164."

2007 TH72	JPL Sentry	1436	2096	1	6.1e-09	-8.00	-8.00	0	JPL: "Analysis based on 28 observations spanning 4.0146 days (2007-Oct-15.20289 to 2007-Oct-19.21753)." Diameter approximately 0.045 km. from mean, weighted H=24.4.
2007 TH72	NEODyS	1436	2078-2087	2	7.62e-09	-7.85	-7.96	0	NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2007/10/15.204 to 2007/10/19.218."

2007 TD71	JPL Sentry	1436	2051-2107	31	2.6e-07	-3.09	-3.99	0	JPL: "Analysis based on 16 observations spanning 5.0269 days (2007-Oct-13.70201 to 2007-Oct-18.72894)." Diameter approximately 0.740 km. from mean, weighted H=18.3.
2007 TD71	NEODyS	1436	2048-2090	18	2.18e-07	-3.15	-4.05	0	NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2007/10/13.703 to 2007/10/18.730."

2007 TU24	JPL Sentry	1436	2039-2104	20	5.7e-06	-3.21	-3.33	0	JPL: "Analysis based on 65 observations spanning 7.9331 days (2007-Oct-11.26838 to 2007-Oct-19.20144)." Diameter approximately 0.320 km. from mean, weighted H=20.1.
2007 TU24	NEODyS	1436	2045-2077	2	6.74e-07	-3.89	-4.04	0	NEODyS: "Based on 65 optical observations (of which 0 are rejected as outliers) from 2007/10/11.269 to 2007/10/19.202."

2007 TB23	JPL Sentry	1510	2097	2	4.2e-07	-3.36	-3.37	0	JPL: "Analysis based on 51 observations spanning 7.8440 days (2007-Oct-10.38885 to 2007-Oct-18.23284)." Diameter approximately 0.620 km. from mean, weighted H=18.7.

2007 TL16	JPL Sentry	1436	2074-2095	13	6.2e-06	-5.94	-6.12	0	JPL: "Analysis based on 38 observations spanning 9.0701 days (2007-Oct-09.28741 to 2007-Oct-18.35748)." Diameter approximately 0.021 km. from mean, weighted H=26.1.
2007 TL16	NEODyS	1436	2074-2090	17	5.63e-06	-6.05	-6.20	0	NEODyS: "Based on 38 optical observations (of which 0 are rejected as outliers) from 2007/10/09.288 to 2007/10/18.358."

2007 TC14	NEODyS	1510	2082	1	1.55e-07	-5.25	-5.25	0	NEODyS: "Based on 134 optical observations (of which 0 are rejected as outliers) from 2007/10/08.391 to 2007/10/16.872."
2007 TC14	JPL Sentry	1436	R E M O V E D						JPL: Risk listing removed at 1334 UTC.

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 19 October '07

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

2355	Noted that JPL Sentry has posted 2007 UW1 as an impact risk - see above
2259	Noted that JPL Sentry has posted 2007 UY1 as an impact risk - see above
2159	Grabbed MPEC 2007-U36 - Comets C/2007 R8, 2007 R9, 2007 R10, 2007 S3, 2007 S4 (SOHO) - see above
2059	Grabbed MPEC 2007-U34 - Comets C/2007 Q4, 2007 Q5, 2007 Q6, 2007 Q7 (SOHO) - see above Grabbed MPEC 2007-U35 - Comets C/2007 Q8, 2007 Q9, 2007 R6, 2007 R7 (SOHO) - see above
1723	Grabbed MPEC 2007-U32 - 2007 UB2 - see above Grabbed MPEC 2007-U33 - 2007 UC2 - see above
1658	Grabbed MPEC 2007-U27 - 2007 UW1 - see above Grabbed MPEC 2007-U28 - 2007 UX1 - see above Grabbed MPEC 2007-U29 - 2007 UY1 - see above Grabbed MPEC 2007-U30 - 2007 UZ1 - see above Grabbed MPEC 2007-U31 - 2007 UA2 - see above
1510	Noted that JPL Sentry has updated its 2007 TB23 risk assessment - see above Noted that NEODyS has updated its 2007 TC14 risk assessment - see above Noted that NEODyS has posted 2007 US as an impact risk - see above Grabbed MPEC 2007-U26 - Comet P/2007 T2 (Kowalski) - see above
1437	Grabbed MPEC 2007-U25 - Daily Orbit Update - see above
1436	Noted that JPL Sentry has removed 2007 TC14 as an impact risk - see above Noted that JPL Sentry has updated its 2007 TD71 risk assessment - see above Noted that NEODyS has updated its 2007 TD71 risk assessment - see above Noted that JPL Sentry has updated its 2007 TH72 risk assessment - see above Noted that NEODyS has updated its 2007 TH72 risk assessment - see above Noted that JPL Sentry has updated its 2007 TL16 risk assessment - see above Noted that NEODyS has updated its 2007 TL16 risk assessment - see above Noted that JPL Sentry has updated its 2007 TU24 risk assessment - see above Noted that NEODyS has updated its 2007 TU24 risk assessment - see above

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