20 Sep '07 Tracking News

Contents on 20 September '07

IAU Minor Planet Center
- NEOCP Activity -- eight listings: 8 updated
- New MPECs -- seven MPECs
- Observers -- 28 observing facilities
Impact Risk Monitoring -- five objects reported
Chronology

Resources:

Consolidated Risk Tables - CRT page
Ephemerides for risk-rated objects

Note: 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 more accurately reflect its continuing purpose.

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.

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 20 September '07

The MPC's NEO Confirmation Page has 8 listings: 8 updated

When last checked at 2355 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had eight updated listings. Of these, four were "one nighters." So far Tracking News has counted a total of fourteen 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 20 September '07

Minor Planet Electronic Circulars

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

MPEC 2007-S30 time-stamped "06:09 UT" - Daily Orbit Update - see below
MPEC 2007-S31 time-stamped "17:50 UT" - 2007 SR1 - see below
MPEC 2007-S32 time-stamped "18:00 UT" - 2007 SS1 - see below
MPEC 2007-S33 time-stamped "19:11 UT" - 2007 SU1 - see below
MPEC 2007-S34 time-stamped "19:51 UT" - 2003 SS422, 2003 UC414, 2003 WN193, 2003 WO193, 2006 TK121 - see below
MPEC 2007-S35 time-stamped "20:33 UT" - 2007 SV1 - see below
MPEC 2007-S36 time-stamped "23:11 UT" - Comet P/2007 S1 (Zhao)

MPEC 2007-S36 - "23:11 UT" - Comet P/2007 S1 (Zhao)

PK07S010 P/2007 S1 (q=2.503 AU, Q=5.133 AU, TP=2007 Dec. 10.559 TT) from LONEOS (Sept. 8.41-48p4 & 15.33-38p3), Purple Mtn. Obs. XuYi Station (Sept. 17.79-82p4), Remanzacco Obs. (Sept. 19.90-92p3 & 20.89-91p3), Schiaparelli Obs. (Sept. 19.99p1 & 20.04p1), Junk Bond Obs. (Sept. 20.30-37p4), RAS Obs. Mayhill (Sept. 20.39-40p2), and CAST Obs. (Sept. 20.89-91p3)

MPEC 2007-S35 - "20:33 UT" - 2007 SV1

K07S01V 2007 SV1 (small asteroid, Earth MOID=4.5 LD, H=24.5 ~43m) was discovered at 0617 UT 20 Sept. by the Catalina Sky Survey (CSS), which observed it at Sept. 20.26-28p4, 20.38-39p3, and 20.48-49p4. The discovery was confirmed by Heidelberg-Konigstuhl Obs. (Sept. 20.80-82p3) and Remanzacco Obs. (Sept. 20.83p3).

MPEC 2007-S34 - "19:51 UT" - 2003 SS422, 2003 UC414, 2003 WN193, 2003 WO193, 2006 TK121

K06TC1K 2006 TK121 was discovered at 0642 UT 15 Oct. 2006 by Cerro Tololo Inter-American Obs. (CTIO), which observed it at 2006 Oct. 15.28-30p2 at I=22.7-23.1, 2006 Oct. 19.30p1 at R=23.4, 2006 Oct. 21.29-32p2 at I=22.6-23.2, 2006 Nov. 12.10-12p2 at I=22.8-23.0, 2006 Nov. 26.25p1 at I=22.5, 2006 Dec. 13.12p1 at R=23.2, 2006 Dec. 17.11p1 at R=23.5, 2006 Dec. 19.12p1 at R=23.4, 2006 Dec. 25.15p1 at I=22.9, Jan. 11.10-12p2 at I=23.0-3, and 14.08p1 at I=22.8.
K03WJ3O 2003 WO193 was discovered at 0157 UT 29 Nov. 2003 by CTIO, which observed it at 2003 Nov. 29.08-10p2 at I=22.6-23.2, 2003 Dec. 13.07-09p2 at I=22.5-23.2, 2003 Dec. 17.06-07p2 at I=22.5-23.3, 2003 Dec. 21.07p1 at I=22.9, 2003 Dec. 23.07-09p2 at I=22.6-23.4, 2003 Dec. 25.06p1 at R=23.1, 2003 Dec. 27.07-09p2 at I=22.4-23.3, and 2003 Dec. 29.07p1 at I=22.4.
K03WJ3N 2003 WN193 was discovered at 0421 UT 17 Nov. 2003 by CTIO, which observed it at 2003 Nov. 17.18p1 at I=22.6, 2003 Nov. 21.16-18p2 at I=22.4-7, 2003 Nov. 25.18p1 at I=22.6, 2003 Dec. 17.13-15p2 at I=22.5-9, 2003 Dec. 21.14p1 at I=22.6, 2003 Dec. 23.15-17p2 at I=22.4-23.0, 2003 Dec. 25.14p1 at R=22.8, and 2003 Dec. 29.12-13p2 at I=22.7-23.0.
K03Uf4C 2003 UC414 was discovered at 0015 UT 30 Oct. 2003 by CTIO, which observed it at 2003 Oct. 30.01-03p2 at R=22.4, 2003 Nov. 17.05p1 at I=22.1, 2003 Nov. 21.02-06p3 at I=22.1-9, 2003 Nov. 23.12-13p2 at I=22.3-5, 2003 Nov. 27.03-05p2 at I=22.2-5, 2003 Nov. 27.11p1 at I=22.1, 2003 Dec. 15.04-06p2 at I=22.2-5, 2003 Dec. 21.04-05p2 at I=22.3-8, 2003 Dec. 23.05p2 at I=22.5-9, and 2003 Dec. 27.04-06p2 at I=22.2-6.
K03Sg2S 2003 SS422 was discovered at 0058 UT 28 Sept. 2003 by CTIO, which observed it at 2003 Sept. 28.04-07p2 at I=22.4-9, 2003 Oct. 19.02-04p2 at I=22.5-8, 2003 Oct. 22.01-03p2 at I=22.3-23.1, 2003 Oct. 30.03-05p2 at I=22.2-9, 2003 Nov. 23.05p1 at R=22.7, 2003 Nov. 27.09p1 at R=22.8, and 2003 Dec. 13.04-07p2 at I=22.5-23.2.

MPEC 2007-S33 - "19:11 UT" - 2007 SU1

K07S01U 2007 SU1 (small asteroid, Earth MOID=4.0 LD, H=25.6 ~26m) was discovered at 0249 UT 19 Sept. by LINEAR, which observed it at Sept. 19.12-17p4. The discovery was confirmed by CSS (Sept. 20.22-23p4).

MPEC 2007-S32 - "18:00 UT" - 2007 SS1

K07S01S 2007 SS1 (small asteroid, H=23.6 ~65m) was discovered at 1510 UT 19 Sept. by the Siding Spring Survey (SSS), which observed it at Sept. 19.63-66p4 and 19.74p2. The discovery was confirmed by Tiki Obs. (Sept. 20.55-57p10).

MPEC 2007-S31 - "17:50 UT" - 2007 SR1

K07S01R 2007 SR1 (H=19.3 ~467m) was discovered at 0956 UT 18 Sept. by the Spacewatch 0.9m telescope, which observed it at Sept. 18.41-45p3. The discovery was confirmed by the Spacewatch 1.8m telescope (Sept. 19.25-26p3 & 20.27-28p3) and Astronomical Research Obs. (ARO) (Sept. 19.26-27p3).

<< DOU on 20 Sept. '07 >> MPEC 2007-S30 - "06:09 UT" - Daily Orbit Update

Observations of risk-listed objects
K07S00J 2007 SJ (arc=2 days, H=16.3 ~1.86 km) from ARO (Sept. 19.08-09p3), the Mt. Lemmon Survey (MLS) (Sept. 19.18p3), and Junk Bond Obs. (Sept. 19.22-29p4)
K07RE6T 2007 RT146 (arc=4 days, H=18.6 ~645m) from Spacewatch 1.8m (Sept. 19.35-36p3)
K07RD3Q 2007 RQ133 (Q=4.403 AU, arc=4 days, H=18.5 ~676m) from Spacewatch 1.8m (Sept. 19.31-32p3)
K07R19Y 2007 RY19 (small asteroid, arc=5 days, H=22.5 ~107m) from ARO (Sept. 18.32-34p5)
K07R09U 2007 RU9 (arc=8 days, H=20.8 ~234m) from ARO (Sept. 18.15-16p3)
Observations of recently (no longer) risk-listed objects
K07R12T 2007 RT12 (small asteroid, arc=7 days, H=23.7 ~62m) from Spacewatch 0.9m (Sept. 19.36-38p2)
K07R09V 2007 RV9 (arc=9 days, H=20.0 ~339m) from Spacewatch 0.9m (Sept. 19.17-21p3)
K07R09R 2007 RR9 (Q=4.691 AU, arc=9 days, H=20.3 ~295m) from Desert Moon Obs. (Sept. 19.16-17p3)
K07R02F 2007 RF2 (arc=14 days, H=20.7 ~245m) from Desert Moon Obs. (Sept. 19.37-38p3)
K07R01E 2007 RE1 (almost small, Q=4.264 AU, arc=17 days, H=22.0 ~135m) from Eschenberg Obs. (Sept. 19.84p2)
Observations of small asteroids (H>22.0)
K07S00H 2007 SH (arc=2 days, H=26.2 ~19m) from ARO (Sept. 19.18-19p3)
K07R19W 2007 RW19 (arc=6 days, H=24.7 ~39m) from Inastars Obs. (Sept. 19.87-91p4)
K07R17S 2007 RS17 (arc=5 days, H=22.9 ~89m) from ARO (Sept. 18.18-23p5)
K07R17R 2007 RR17 (arc=6 days, H=23.6 ~65m) from LINEAR (Sept. 19.29-37p9)
K07R09P 2007 RP9 (arc=9 days, H=23.0 ~85m) from ARO (Sept. 18.05-07p4 & 19.09p1)
Observations of other objects
K07RD3P 2007 RP133 (Q=4.151 AU, arc=4 days, H=20.6 ~257m) from ARO (Sept. 18.23p2) and Desert Moon Obs. (Sept. 19.32-34p3)
K07RD3M 2007 RM133 (arc=5 days, H=18.3 ~741m) from Desert Moon Obs. (Sept. 19.40-43p3)
K07R20D 2007 RD20 (arc=5 days, H=21.2 ~195m) from Desert Moon Obs. (Sept. 19.48-50p3)
K07R19V 2007 RV19 (Q=5.633 AU, arc=6 days, H=18.7 ~616m) from LINEAR (Sept. 19.11-16p5), Desert Moon Obs. (Sept. 19.13-14p3), and Eschenberg Obs. (Sept. 19.79p7)
K07R12R 2007 RR12 (arc=8 days, H=19.8 ~371m) from Desert Moon Obs. (Sept. 19.35-36p3) and Inastars Obs. (Sept. 19.85-86p3)
K07R05F 2007 RF5 (arc=14 days, H=18.5 ~676m) from Desert Moon Obs. (Sept. 19.45-46p3)
K07Q02K 2007 QK2 (arc=29 days, H=20.6 ~257m) from Capannoli Obs. (Sept. 19.90-91p2)
K07P11U 2007 PU11 (Q=4.384 AU, arc=3 opp, H=16.3 ~1.86 km) from Greiner Research Obs. (Sept. 20.15-16p4)
K07P08E 2007 PE8 (arc=128 days, H=19.4 ~446m) from Eschenberg Obs. (Sept. 19.80p6)
K07P08A 2007 PA8 (Q=4.693 AU, arc=41 days, H=15.8 ~2.34 km, q=0.957 AU) from Desert Moon Obs. (Sept. 19.09-11p3)
K07L32R 2007 LR32 (arc=118 days, H=17.2 ~1.23 km) from Peschiera del Garda Obs. (Sept. 18.90-91p3 & 19.92-96p5), Petit Jean Mtn. South Obs. (PJMSO) (Sept. 19.31-32p6), Eschenberg Obs. (Sept. 19.77p7), and Greiner Research Obs. (Sept. 20.14p4)
K07H03W 2007 HW3 (Q=4.273 AU, arc=155 days, H=20.4 ~282m) from Inastars Obs. (Sept. 19.83-84p3)
K07D41A 2007 DA41 (arc=3 opp, H=17.6 ~1.02 km) from Remanzacco Obs. (Sept. 19.78p2)
K06V02V 2006 VV2 (arc=2 opp, H=16.8 ~1.48 km) from Modra Obs. (March 14.80-81p2)
K05O01U 2005 OU1 (arc=3 opp, H=20.1 ~323m) from Madonna di Dossobuono Obs. (Sept. 18.87p3)
K04RP2D 2004 RD252 (arc=2 opp, H=19.1 ~513m) from Madonna di Dossobuono Obs. (Sept. 18.90-91p3)
K02S00V 2002 SV (arc=2 opp, H=19.8 ~371m) from LINEAR (Sept. 19.17-22p5), Eschenberg Obs. (Sept. 19.78p7), and Greiner Research Obs. (Sept. 20.13p4)
K01Q34C 2001 QC34 (arc=2 opp, H=20.0 ~339m) from CSS (Sept. 19.23-25p4)
J99J03U 1999 JU3 (arc=4 opp, H=19.2 ~490m) from LINEAR (Sept. 19.23-27p4), CSS (Sept. 19.23-25p4), PJMSO (Sept. 19.27-28p5), and Capannoli Obs. (Sept. 19.93p2)
J98S15D 1998 SD15 (arc=4 opp, H=19.2 ~490m) from PJMSO (Sept. 19.28-29p8), Eschenberg Obs. (Sept. 19.76p3), and Peschiera del Garda Obs. (Sept. 19.85p5)
F4330 154330 2002 VX94 from Spacewatch 0.9m (Sept. 19.23-25p2)
A0756 100756 1998 FM5 from LINEAR (Sept. 19.18-23p4)
86324 86324 1999 WA2 from Siegen Obs. (Sept. 18.84-85p3)
16636 16636 1993 QP from Ametlla del Valles Obs. (Sept. 17.81-86p12, 17.93-97p18 & 19.99-01p3) and LINEAR (Sept. 19.23-27p5)
04503 4503 Cleobulus (1989 WM) from LINEAR (Sept. 19.42-47p5)
02212 2212 Hephaistos (1978 SB) from LINEAR (Sept. 19.30-38p10)
01865 1865 Cerberus (1971 UA) from LINEAR (Sept. 19.36-40p5)

Observers on 20 September '07

A total of 28 observing facilities appear in today's MPECs.

Code	Observer / observatory
`B37`	Ametlla del Valles Obs. in Spain, 1 in MPEC 2007-S30 -- 16636
`H55`	Astronomical Research Obs. in Illinois, 8 in MPECs 2007-S30 & 2007-S31 -- 2007 SR1, 2007 SJ, 2007 SH, 2007 RY19, 2007 RU9, 2007 RS17, 2007 RP9, 2007 RP133
`235`	CAST Obs. in Italy, 1 in MPEC 2007-S36 -- P/2007 S1
`B09`	Capannoli Obs. in Italy, 2 in MPEC 2007-S30 -- 2007 QK2, 1999 JU3
`703`	Catalina Sky Survey in Arizona, 4 in MPECs 2007-S30, 2007-S33 & 2007-S35 -- 2007 SV1, 2007 SU1, 2001 QC34, 1999 JU3
`807`	Cerro Tololo Inter-American Obs. in Chile, 5 in MPEC 2007-S34 -- 2006 TK121, 2003 WO193, 2003 WN193, 2003 UC414, 2003 SS422
`448`	Desert Moon Obs. in New Mexico, 9 in MPEC 2007-S30 -- 2007 RV19, 2007 RR9, 2007 RR12, 2007 RP133, 2007 RM133, 2007 RF5, 2007 RF2, 2007 RD20, 2007 PA8
`151`	Eschenberg Obs. in Switzerland, 6 in MPEC 2007-S30 -- 2007 RV19, 2007 RE1, 2007 PE8, 2007 LR32, 2002 SV, 1998 SD15
`H51`	Greiner Research Obs. in Wisconsin, 3 in MPEC 2007-S30 -- 2007 PU11, 2007 LR32, 2002 SV
`024`	Heidelberg-Konigstuhl Obs. in Germany, 1 in MPEC 2007-S35 -- 2007 SV1
`B15`	Inastars Obs. in Germany, 3 in MPEC 2007-S30 -- 2007 RW19, 2007 RR12, 2007 HW3
`701`	Junk Bond Obs. in Arizona, 2 in MPECs 2007-S30 & 2007-S36 -- 2007 SJ, P/2007 S1
`704`	LINEAR in New Mexico, 10 in MPECs 2007-S30 & 2007-S33 -- 2007 SU1, 2007 RV19, 2007 RR17, 2002 SV, 1999 JU3, 16636, 100756, 4503, 2212, 1865
`699`	LONEOS in Arizona, 1 in MPEC 2007-S36 -- P/2007 S1
`560`	Madonna di Dossobuono Obs. in Italy, 2 in MPEC 2007-S30 -- 2005 OU1, 2004 RD252
`118`	Modra Obs. in Slovakia, 1 in MPEC 2007-S30 -- 2006 VV2
`G96`	Mt. Lemmon Survey in Arizona, 1 in MPEC 2007-S30 -- 2007 SJ
`A53`	Peschiera del Garda Obs. in Italy, 2 in MPEC 2007-S30 -- 2007 LR32, 1998 SD15
`H45`	Petit Jean Mtn. South Obs. in Arkansas, 3 in MPEC 2007-S30 -- 2007 LR32, 1999 JU3, 1998 SD15
`D29`	Purple Mtn. Obs. XuYi Station in China, 1 in MPEC 2007-S36 -- P/2007 S1
`H06`	RAS Obs. Mayhill in New Mexico, 1 in MPEC 2007-S36 -- P/2007 S1
`473`	Remanzacco Obs. in Italy, 3 in MPECs 2007-S30, 2007-S35 & 2007-S36 -- 2007 SV1, P/2007 S1, 2007 DA41
`204`	Schiaparelli Obs. in Italy, 1 in MPEC 2007-S36 -- P/2007 S1
`E12`	Siding Spring Survey in New South Wales, 1 in MPEC 2007-S32 -- 2007 SS1
`510`	Siegen Obs. in Germany, 1 in MPEC 2007-S30 -- 86324
`691`	Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2007-S30 & 2007-S31 -- 2007 SR1, 2007 RV9, 2007 RT12, 154330
`291`	Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2007-S30 & 2007-S31 -- 2007 SR1, 2007 RT146, 2007 RQ133
`F85`	Tiki Obs. in Tahiti, 1 in MPEC 2007-S32 -- 2007 SS1

Impact Risk Monitoring on 20 September '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 SJ	JPL	1402	2023-2105	31	6.3e-08	-2.90	-3.56	0	JPL: "Analysis based on 32 observations spanning 2.1033 days (2007-Sep-17.18208 to 2007-Sep-19.28541)." Diameter approximately 1.852 km. from mean, weighted H=16.3.
2007 SJ	NEODyS	1402	2011-2087	30	6.81e-08	-2.54	-3.09	0	NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2007/09/17.183 to 2007/09/19.286."

2007 RY19	JPL	1402	2016-2107	151	7.5e-05	-3.07	-3.94	0	JPL: "Analysis based on 28 observations spanning 4.7161 days (2007-Sep-14.35284 to 2007-Sep-19.0689)." Diameter approximately 0.110 km. from mean, weighted H=22.4.
2007 RY19	NEODyS	1402	2016-2090	92	3.6e-05	-3.25	-3.86	0	NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2007/09/14.354 to 2007/09/19.070."

2007 RU9	JPL	1402	2020-2039	3	3.2e-07	-3.96	-4.14	0	JPL: "Analysis based on 70 observations spanning 7.9421 days (2007-Sep-10.28596 to 2007-Sep-18.22807)." Diameter approximately 0.230 km. from mean, weighted H=20.8.
2007 RU9	NEODyS	1402	2030	1	2.79e-07	-4.08	-4.08	0	NEODyS: "Based on 72 optical observations (of which 2 are rejected as outliers) from 2007/09/10.287 to 2007/09/18.229."

2007 RT146	JPL	1402	R E M O V E D						JPL: Risk listing removed at 1343 UTC.
2007 RT146	NEODyS	1401	R E M O V E D

2007 RQ133	JPL	1402	R E M O V E D						JPL: Risk listing removed at 1254 UTC.
2007 RQ133	NEODyS	1401	R E M O V E D

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 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 20 September '07

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

2336	Grabbed MPEC 2007-S36 - Comet P/2007 S1 (Zhao) - see above
2104	Grabbed MPEC 2007-S33 - 2007 SU1 - see above Grabbed MPEC 2007-S34 - 2003 SS422, 2003 UC414, 2003 WN193, 2003 WO193, 2006 TK121 - see above Grabbed MPEC 2007-S35 - 2007 SV1 - see above
1820	Grabbed MPEC 2007-S32 - 2007 SS1 - see above
1759	Grabbed MPEC 2007-S31 - 2007 SR1 - see above
1402	Noted that JPL has removed 2007 RQ133 as an impact risk - see above Noted that JPL has removed 2007 RT146 as an impact risk - see above Noted that JPL has updated its 2007 RU9 risk assessment - see above Noted that NEODyS has updated its 2007 RU9 risk assessment - see above Noted that JPL has updated its 2007 RY19 risk assessment - see above Noted that NEODyS has updated its 2007 RY19 risk assessment - see above Noted that JPL has updated its 2007 SJ risk assessment - see above Noted that NEODyS has updated its 2007 SJ risk assessment - see above Grabbed MPEC 2007-S30 - Daily Orbit Update - see above
1401	Noted that NEODyS has removed 2007 RQ133 as an impact risk - see above Noted that NEODyS has removed 2007 RT146 as an impact risk - see above

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