2008-09-24 Tracking News

Contents on 24 September '08

IAU Minor Planet Center
- NEOCP Activity -- twelve listings: 4 new, 8 updated
- New MPECs -- twelve MPECs
Observers -- 48 observing facilities
Impact Risk Monitoring -- one object
Chronology

Resources:

Consolidated Risk Tables - the CRT page
Earth's Busy Neighborhood Traffic Report
Ephemerides for risk-rated and nearby objects
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 24 September '08

The MPC's NEO Confirmation Page has 12 listings: 4 new, 8 updated

When last checked at 2358 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had four new and eight updated listings. Of these, eleven were "one nighters." The Tracking News counted a total of 22 objects listed on the NEOCP at some point on this day.

New MPECs on 24 September '08

Minor Planet Electronic Circulars

There were twelve MPECs issued this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-S38 time-stamped "00:44 UT" - 2008 SO1 - see below
MPEC 2008-S39 time-stamped "00:48 UT" - 2008 SQ1 - see below
MPEC 2008-S40 time-stamped "00:54 UT" - 2008 SR1 - see below
MPEC 2008-S41 time-stamped "01:44 UT" - 2008 ST1 - see below
MPEC 2008-S42 time-stamped "01:50 UT" - 2008 SU1 - see below
MPEC 2008-S43 time-stamped "01:58 UT" - 2008 SW1 - see below
MPEC 2008-S44 time-stamped "04:18 UT" - 2008 SZ1 - see below
MPEC 2008-S45 time-stamped "06:06 UT" - Daily Orbit Update - see below
MPEC 2008-S46 time-stamped "15:29 UT" - Comet P/2008 R1 (Garradd) - see below
MPEC 2008-S47 time-stamped "16:45 UT" - Comet 205P/Giacobini - see below
MPEC 2008-S48 time-stamped "17:48 UT" - Comet P/2008 QP20 (Linear-Hill) - see below
MPEC 2008-S49 time-stamped "23:03 UT" - Comet C/1999 X3 = 2004 E2 = 2008 K10 (SOHO)

MPEC 2008-S49 - "23:03 UT" - Comet C/1999 X3 = 2004 E2 = 2008 K10 (SOHO)

CK08K100 C/2008 K10 (SOHO) (q=0.048 AU, Q=5.173 AU, TP=2008 May 31.33408 TT)
CK04E020 C/2004 E2 (SOHO) (q=0.048 AU, Q=5.175 AU, TP=2004 Mar. 12.32618 TT)
CJ99X030 C/1999 X3 (SOHO) (q=0.052 AU, Q=5.198 AU, TP=1999 Dec. 12.87853 TT)

MPEC 2008-S48 - "17:48 UT" - Comet P/2008 QP20 (Linear-Hill)

PK08Q20P P/2008 QP20 (LINEAR-Hill) (q=1.724 AU, Q=5.266 AU, TP=2008 Nov. 2.277 TT) from the Catalina Sky Survey (CSS) (Sept. 23.26-34p8 & 24.29-32p4), Naef Obs. (Sept. 23.97-99p2), Nazaret Obs. (Sept. 24.04-05p3), Grasslands Obs. (Sept. 24.23p3), the Mt. Lemmon Survey (MLS) (Sept. 24.30-33p4), Astronomical Research Obs. (ARO) (Sept. 24.34-36p3), RAS Obs. Mayhill (Sept. 24.38-41p2), Cordell-Lorenz Obs. (Sept. 24.39-42p3), Mt. John Obs. (Sept. 24.52-53p3), and Moriyama Obs. (Sept. 24.61p2 & 24.67p2)

MPEC 2008-S47 - "16:45 UT" - Comet 205P/Giacobini

0205P 205P/Giacobini from Cordell-Lorenz Obs. (Sept. 17.10-11p2, 19.07-11p6, 22.10-17p12, 23.04-08p6, 23.15-20p4 & 24.11-22p9), Vicksburg Obs. (Sept. 22.13-14p3), Table Mtn. Obs. (Sept. 22.18-28p6 & 23.14-20p6), Auckland Obs. (Sept. 22.42-43p3), Yatsuka Obs. (Sept. 22.52-56p3), Konan Obs. (Sept. 22.52-53p2), Hiratsuka Obs. (Sept. 22.55p3), Moriyama Obs. (Sept. 22.58-59p2), Calarreona Obs. (Sept. 22.81-83p3), Nazaret Obs. (Sept. 22.96-97p4 & 23.94-97p7), Hamamatsu-Yuto Obs. (Sept. 23.49-51p6), Great Shefford Obs. (Sept. 23.84p2 & 23.93p1), La Canada Obs. (Sept. 23.84-85p3), Aravaca Obs. (Sept. 23.87p2), and Malaga Obs. (Sept. 23.96-98p3)

MPEC 2008-S46 - "15:29 UT" - Comet P/2008 R1 (Garradd)

PK08R010 P/2008 R1 (Garradd) from the Siding Spring Survey (SSS) (Sept. 2.51p1, 2.56p1, 9.39p1, 23.38-42p3 & 24.39p1), Hibiscus Obs. (Sept. 23.33-37p2 & 24.34p1), and Kambah Obs. (Sept. 24.46-47p2)

<< DOU on 24 Sept. '08 >> MPEC 2008-S45 - "06:06 UT" - Daily Orbit Update

Observations of recently (no longer) risk-listed objects
K08S00R 2008 SR (almost small, arc=2 days, H=21.8 ~148m) from the Spacewatch 1.8m telescope (Sept. 23.25p3)
K08S00O 2008 SO (arc=2 days, H=20.9 ~224m) from ARO (Sept. 23.26-27p4)
K08R01J 2008 RJ1 (arc=17 days, H=17.7 ~977m) from the Spacewatch 0.9m telescope (Sept. 21.20-22p2)
K08R01H 2008 RH1 (small asteroid, arc=19 days, H=22.5 ~107m) from ARO (Sept. 22.24-25p3), Desert Moon Obs. (Sept. 23.09-12p3), and Spacewatch 1.8m (Sept. 23.27-28p3)
K08R01G 2008 RG1 (arc=18 days, H=20.7 ~245m) from ARO (Sept. 22.30-31p3)
K08O09B 2008 OB9 (Q=5.652 AU, arc=56 days, H=17.4 ~1.12 km) from ARO (Sept. 23.11-15p5)
Observations of small asteroids (H>22.0)
K08S00S 2008 SS (arc=2 days, H=22.1 ~129m) from SSS (Sept. 23.39-40p2)
K08S00P 2008 SP (arc=2 days, H=23.3 ~74m) from ARO (Sept. 23.20-23p3)
K08R01K 2008 RK1 (Q=4.371 AU, arc=18 days, H=22.2 ~123m) from Spacewatch 0.9m (Sept. 19.45-49p3 & 22.20-24p3)
Observations of other objects
K08S01R 2008 SR1 (arc=0 days, H=20.2 ~309m) from Nazaret Obs. (Sept. 24.03-04p4) and CEAMIG-REA (Sept. 24.04p7)
K08S01Q 2008 SQ1 (Q=4.671 AU, arc=15 days, H=18.1 ~812m) from Stonegate Obs. (Sept. 24.11-14p5)
K08S01N 2008 SN1 (Q=4.034 AU, arc=4 days, H=19.6 ~407m) from Celbridge Obs. (Sept. 23.93-97p10) and Naef Obs. (Sept. 23.96-99p2)
K08S00Q 2008 SQ (arc=2 days, H=19.4 ~446m) from Petit Jean Mtn. South Obs. (PJMSO) (Sept. 23.27-30p8) and MLS (Sept. 23.43-45p4)
K08S00E 2008 SE (arc=3 days, H=19.2 ~490m) from ARO (Sept. 23.28-29p4), PJMSO (Sept. 23.30-31p7), and Sandlot Obs. (Sept. 23.38-40p5)
K08R98G 2008 RG98 (arc=13 days, H=17.2 ~1.23 km) from Spacewatch 0.9m (Sept. 22.19-23p3)
K08R80E 2008 RE80 (arc=12 days, H=18.1 ~812m) from MLS (Sept. 20.33-35p4), ARO (Sept. 22.28-30p4), and Desert Moon Obs. (Sept. 23.24p1)
K08R24Z 2008 RZ24 (arc=15 days, H=19.9 ~355m) from ARO (Sept. 22.33-34p4)
K08R24Y 2008 RY24 (arc=3 opp, H=17.8 ~933m) from ARO (Sept. 23.10p3) and Mirasteilas Obs. (Sept. 23.77-78p3)
K08R24Q 2008 RQ24 (arc=17 days, H=20.6 ~257m) from Spacewatch 0.9m (Sept. 20.20-23p3 & 22.19-23p3)
K08Q00F 2008 QF (arc=32 days, H=21.6 ~162m) from Spacewatch 1.8m (Sept. 20.20p3) and Spacewatch 0.9m (Sept. 22.12p1)
K08M01R 2008 MR1 (arc=3 opp, H=18.4 ~708m) from PJMSO (Sept. 23.31-32p6)
K08M00Z 2008 MZ (Q=4.207 AU, arc=99 days, H=18.3 ~741m) from ARO (Sept. 22.41-42p4)
K07Y00J 2007 YJ (arc=2 opp, H=21.6 ~162m) from MLS (Sept. 23.37-48p12)
K07S01R 2007 SR1 (arc=2 opp, H=19.8 ~371m) from Desert Moon Obs. (Sept. 23.16-19p2)
K07A02T 2007 AT2 (arc=2 opp, H=19.6 ~407m) from Spacewatch 1.8m (Sept. 23.47-49p3)
K06T00N 2006 TN (arc=2 opp, H=19.6 ~407m) from Spacewatch 0.9m (Sept. 21.36-39p2)
K05T15R 2005 TR15 (arc=2 opp, H=18.6 ~645m) from Sandlot Obs. (Sept. 23.33-37p5 & 24.21-22p3)
K05P00O 2005 PO (arc=2 opp, H=19.8 ~371m) from Spacewatch 1.8m (Sept. 23.45p2)
K05B00C 2005 BC (arc=2 opp, H=18.0 ~851m) from CSS (Sept. 23.10-12p4)
K04H12E 2004 HE12 (i=42.7°, arc=4 opp, H=17.6 ~1.02 km) from ARO (Sept. 22.26-28p4)
K03YB8G 2003 YG118 (arc=5 opp, H=17.1 ~1.29 km) from Spacewatch 1.8m (Sept. 23.28-29p3 at V=22.1-2)
K03WF8D 2003 WD158 (arc=4 opp, H=18.9 ~562m) from Spacewatch 1.8m (Sept. 23.38-40p3)
K03O04B 2003 OB4 (Q=4.516 AU, arc=2 opp, H=19.3 ~467m) from ARO (Sept. 23.16-17p4)
K03G00W 2003 GW (i=49.4°, arc=3 opp, H=16.8 ~1.48 km) from Hamamatsu-Yuto Obs. (Sept. 23.44-47p8) and Eschenberg Obs. (Sept. 23.76-77p7)
K02S41S 2002 SS41 (i=63.7°, arc=3 opp, H=17.2 ~1.23 km) from CSS (Sept. 23.22-25p4, 23.29-30p3 & 23.35-36p4)
K01SR6G 2001 SG276 (arc=4 opp, H=17.7 ~977m) from LINEAR (Sept. 23.38-40p3)
K01S10G 2001 SG10 (arc=5 opp, H=20.3 ~295m) from CSS (Sept. 22.50-51p4)
K01S03Q 2001 SQ3 (arc=2 opp, H=21.6 ~162m) from Eschenberg Obs. (Sept. 23.77-78p7)
K01QF3L 2001 QL153 (arc=2 opp, H=19.0 ~537m) from LINEAR (Sept. 23.18-22p4)
K01C42K 2001 CK42 (arc=4 opp, H=20.0 ~339m) from Spacewatch 0.9m (Sept. 21.31-34p3)
J99R27J 1999 RJ27 (arc=2 opp, H=19.5 ~426m) from LINEAR (Sept. 23.23-28p5)
J98S00O 1998 SO (q=0.220 AU, arc=2 opp, H=20.6 ~257m) from LINEAR (Sept. 23.23-28p5)
J94A01W 1994 AW1 from CSS (Sept. 21.17-19p4)
J0491 190491 2000 FJ10 from Spacewatch 0.9m (Sept. 23.30-33p3)
J0208 190208 2006 AQ from MLS (Sept. 23.10-12p4)
J0135 190135 2005 QE30 from CSS (Sept. 22.34-36p3)
I9700 189700 2001 TA45 from Vicksburg Obs. (Sept. 23.17-18p3)
I9552 189552 2000 RL77 from CSS (Sept. 22.26-29p4)
I5851 185851 2000 DP107 from Taurus-1 Obs. (Sept. 22.97-00p23 & 24.03-09p49) and CSS (Sept. 23.32-35p4)
G4400 164400 2005 GN59 from Vitebsk Obs. (Sept. 22.86-87p6), Stonegate Obs. (Sept. 23.14-16p4), Vicksburg Obs. (Sept. 23.14-15p3), and Hamamatsu-Yuto Obs. (Sept. 23.56p4)
G2635 162635 2000 SS164 from LINEAR (Sept. 23.23-28p3) and MLS (Sept. 23.27-30p4)
G2186 162186 1999 OP3 from CSS (Sept. 22.30-33p4)
G2149 162149 1998 YQ11 from CSS (Sept. 23.42-44p4)
F5140 155140 2005 UD from CSS (Sept. 23.37-39p4)
E0288 140288 2001 SN289 from SSS (Sept. 23.56-59p3)
D8847 138847 2000 VE62 from CSS (Sept. 22.40-49p8)
D7799 137799 1999 YB from MLS (Sept. 23.47-49p3)
D7044 137044 1998 UC50 from Spacewatch 0.9m (Sept. 21.18-21p2)
A6589 106589 2000 WN107 from MLS (Sept. 23.17-19p8)
A2873 102873 1999 WK11 from SSS (Sept. 23.43-46p3)
96744 96744 1999 OW3 from LINEAR (Sept. 23.35-39p5)
90075 90075 2002 VU94 from CSS (Sept. 23.37-39p4)
38239 38239 1999 OR3 from Spacewatch 0.9m (Sept. 21.18-20p2)
16960 16960 1998 QS52 from Taurus-1 Obs. (Sept. 23.01-03p17 & 23.81-88p59)
12538 12538 1998 OH from CSS (Sept. 23.19-22p4)
11500 11500 1989 UR from CSS (Sept. 23.15-17p3)
09856 9856 1991 EE from LINEAR (Sept. 23.41-45p5)
08567 8567 1996 HW1 from Sabadell Obs. (Sept. 13.91p3), LINEAR (Sept. 23.29-34p5), and Taurus-1 Obs. (Sept. 23.90-95p42)
07888 7888 1993 UC from LINEAR (Sept. 23.23-28p5) and Mirasteilas Obs. (Sept. 23.82-83p3)
05143 5143 Heracles (1991 VL) from CSS (Sept. 22.41-43p4)
05011 5011 Ptah (6743 P-L) from LINEAR (Sept. 23.17-22p5)
04450 4450 Pan (1987 SY) from CSS (Sept. 23.44-47p4)
04257 4257 Ubasti (1987 QA) from CSS (Sept. 21.20-22p3)
04183 4183 Cuno (1959 LM) from CSS (Sept. 23.26-29p4)
04179 4179 Toutatis (1989 AC) from Vicksburg Obs. (Sept. 23.11-12p3)
03752 3752 Camillo (1985 PA) from CSS (Sept. 21.14-15p4)
03352 3352 McAuliffe (1981 CW) from LINEAR (Sept. 23.18-21p4)
01865 1865 Cerberus (1971 UA) from CSS (Sept. 23.41-43p4)
01627 1627 Ivar (1929 SH) from Goodricke-Pigott Obs. (Sept. 22.44-46p3)
01620 1620 Geographos (1951 RA) from Taurus-1 Obs. (Sept. 23.04-06p15) and LINEAR (Sept. 23.36-40p4)
00887 887 Alinda (1918 DB) from LINEAR (Sept. 23.17-21p5)

MPEC 2008-S44 - "04:18 UT" - 2008 SZ1

K08S01Z 2008 SZ1 (small asteroid, H=24.6 ~41m) was discovered at 0656 UT on 23 Sept. by CSS, which observed it at Sept. 23.29-30p4 and 23.35-40p8. The discovery was confirmed by ARO (Sept. 23.34p3), Sabino Canyon Obs. (Sept. 23.36p2), Jim Young via Table Mtn. Obs. (Sept. 23.40-42p4), and Tiki Obs. (Sept. 23.58-60p2).

MPEC 2008-S43 - "01:58 UT" - 2008 SW1

K08S01W 2008 SW1 (H=21.6 ~162m) was discovered at 0734 UT on 23 Sept. by CSS, which observed it at Sept. 23.32-34p4, 23.40p4, and 23.47p4. The discovery was confirmed by Spacewatch 0.9m (Sept. 23.41-44p3), ARO (Sept. 23.44p3), Young/Table Mtn. (Sept. 23.45-47p4), and Naef Obs. (Sept. 23.00-01p2).

MPEC 2008-S42 - "01:50 UT" - 2008 SU1

K08S01U 2008 SU1 (risk-listed, H=19.3 ~467m) was discovered at 0431 UT on 23 Sept. by CSS, which observed it at Sept. 23.19-28p8. The discovery was confirmed by ARO (Sept. 23.29-31p4), Sabino Canyon Obs. (Sept. 23.31p2), and Celbridge Obs. (Sept. 23.92-96p6).

MPEC 2008-S41 - "01:44 UT" - 2008 ST1

K08S01T 2008 ST1 (small asteroid, Earth MOID=1.2 LD, H=26.9 ~14m) was discovered at 0719 UT on 22 Sept. by LINEAR, which observed it at Sept. 22.31-34p4 and 23.36-39p4. This object is now within ten lunar distances (LD) of Earth, reaching 1.6 LD on 21 Sept.

MPEC 2008-S40 - "00:54 UT" - 2008 SR1

K08S01R 2008 SR1 (H=20.2 ~309m) was discovered at 1334 UT on 23 Sept. by SSS, which observed it at Sept. 23.57-59p4 and 23.64p2. The discovery was confirmed by Grove Creek Obs. (Sept. 23.67-70p6), Rolando Ligustri via RAS Obs. Moorook (Sept. 23.75-76p2), Farra d'Isonzo Obs. (Sept. 23.79-80p2), Bastia Obs. (Sept. 23.80p3), and Great Shefford Obs. (Sept. 23.94p3).

MPEC 2008-S39 - "00:48 UT" - 2008 SQ1

K08S01Q 2008 SQ1 (Q=4.647 AU, H=18.1 ~812m) was discovered at 0520 UT on 23 Sept. by CSS, which observed it at Sept. 9.31-32p3, 23.22-25p4, and 23.29-30p4. The discovery was confirmed by ARO (Sept. 23.32-33p3), Sabino Canyon Obs. (Sept. 23.35-36p2), Young/Table Mtn. (Sept. 23.39-40p4), Cordell-Lorenz Obs. (Sept. 23.40-43p3), E. Guido via RAS Obs. Mayhill (Sept. 23.46-47p2), Kinver Obs. (Sept. 23.84-88p4), Capannoli Obs. (Sept. 23.87-88p3), Celbridge Obs. (Sept. 23.90-95p8), and Naef Obs. (Sept. 23.96-98p2).

MPEC 2008-S38 - "00:44 UT" - 2008 SO1

K08S01O 2008 SO1 (Q=4.427 AU, H=19.2 ~490m) was discovered at 1040 UT on 22 Sept. by MLS, which observed it at Sept. 22.44-50p8 and 23.47-49p4.

Observers on 24 September '08

A total of 48 observing facilities appeared in this day's MPECs.

Code	Observer / observatory
`J20`	Aravaca Obs., 1 in MPEC 2008-S47 -- 205P
`H55`	Astronomical Research Obs. (ARO) in Illinois, 17 in MPECs 2008-S39, 2008-S42, 2008-S43, 2008-S44, 2008-S45 & 2008-S48 -- 2008 SZ1, 2008 SW1, 2008 SU1, 2008 SQ1, 2008 SP, 2008 SO, 2008 SE, 2008 RZ24, 2008 RY24, 2008 RH1, 2008 RG1, 2008 RE80, P/2008 QP20, 2008 OB9, 2008 MZ, 2004 HE12, 2003 OB4
`467`	Auckland Obs. in New Zealand, 1 in MPEC 2008-S47 -- 205P
`197`	Bastia Obs. in Italy, 1 in MPEC 2008-S40 -- 2008 SR1
`I77`	CEAMIG-REA in Brazil, 1 in MPEC 2008-S45 -- 2008 SR1
`J79`	Calarreona Obs. in Spain, 1 in MPEC 2008-S47 -- 205P
`B09`	Capannoli Obs. in Italy, 1 in MPEC 2008-S39 -- 2008 SQ1
`703`	Catalina Sky Survey (CSS) in Arizona, 25 in MPECs 2008-S39, 2008-S42, 2008-S43, 2008-S44, 2008-S45 & 2008-S48 -- 2008 SZ1, 2008 SW1, 2008 SU1, 2008 SQ1, P/2008 QP20, 2005 BC, 2002 SS41, 2001 SG10, 1994 AW1, 90075, 190135, 189552, 185851, 162186, 162149, 155140, 138847, 12538, 11500, 5143, 4450, 4257, 4183, 3752, 1865
`J65`	Celbridge Obs. in Ireland, 3 in MPECs 2008-S39, 2008-S42 & 2008-S45 -- 2008 SU1, 2008 SQ1, 2008 SN1
`850`	Cordell-Lorenz Obs. in Tennessee, 3 in MPECs 2008-S39, 2008-S47 & 2008-S48 -- 2008 SQ1, P/2008 QP20, 205P
`448`	Desert Moon Obs. in New Mexico, 3 in MPEC 2008-S45 -- 2008 RH1, 2008 RE80, 2007 SR1
`151`	Eschenberg Obs. in Switzerland, 2 in MPEC 2008-S45 -- 2003 GW, 2001 SQ3
`595`	Farra d'Isonzo Obs. in Italy, 1 in MPEC 2008-S40 -- 2008 SR1
`683`	Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2008-S45 -- 1627
`651`	Grasslands Obs. in Arizona, 1 in MPEC 2008-S48 -- P/2008 QP20
`J95`	Great Shefford Obs. in England, 2 in MPECs 2008-S40 & 2008-S47 -- 2008 SR1, 205P
`E16`	Grove Creek Obs. in New South Wales, 1 in MPEC 2008-S40 -- 2008 SR1
`379`	Hamamatsu-Yuto Obs. in Japan, 3 in MPECs 2008-S45 & 2008-S47 -- 2003 GW, 164400, 205P
`F84`	Hibiscus Obs. in Tahiti, 1 in MPEC 2008-S46 -- P/2008 R1
`D88`	Hiratsuka Obs., 1 in MPEC 2008-S47 -- 205P
`415`	Kambah Obs. in the Australian Capital Territory, 1 in MPEC 2008-S46 -- P/2008 R1
`J66`	Kinver Obs. in England, 1 in MPEC 2008-S39 -- 2008 SQ1
`352`	Konan Obs. in Japan, 1 in MPEC 2008-S47 -- 205P
`704`	LINEAR in New Mexico, 14 in MPECs 2008-S41 & 2008-S45 -- 2008 ST1, 2001 SG276, 2001 QL153, 1999 RJ27, 1998 SO, 96744, 162635, 9856, 8567, 7888, 5011, 3352, 1620, 887
`J87`	La Canada Obs. in Spain, 1 in MPEC 2008-S47 -- 205P
`J40`	Malaga Obs. in Spain, 1 in MPEC 2008-S47 -- 205P
`B67`	Mirasteilas Obs. in Switzerland, 2 in MPEC 2008-S45 -- 2008 RY24, 7888
`900`	Moriyama Obs. in Japan, 2 in MPECs 2008-S47 & 2008-S48 -- P/2008 QP20, 205P
`474`	Mt. John Obs. in New Zealand, 1 in MPEC 2008-S48 -- P/2008 QP20
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2008-S38, 2008-S45 & 2008-S48 -- 2008 SQ, 2008 SO1, 2008 RE80, P/2008 QP20, 2007 YJ, 190208, 162635, 137799, 106589
`A13`	Naef Obs. in Switzerland, 4 in MPECs 2008-S39, 2008-S43, 2008-S45 & 2008-S48 -- 2008 SW1, 2008 SQ1, 2008 SN1, P/2008 QP20
`J47`	Nazaret Obs. in Spain, 3 in MPECs 2008-S45, 2008-S47 & 2008-S48 -- 2008 SR1, P/2008 QP20, 205P
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 3 in MPEC 2008-S45 -- 2008 SQ, 2008 SE, 2008 MR1
`H06`	RAS Obs. Mayhill in New Mexico, 1 in MPEC 2008-S48 -- P/2008 QP20
`H06%`	E. Guido in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2008-S39 -- 2008 SQ1
`D90*`	Rolando Ligustri in Italy via RAS Obs. Moorook in South Australia, 1 in MPEC 2008-S40 -- 2008 SR1
`619`	Sabadell Obs. in Spain, 1 in MPEC 2008-S45 -- 8567
`854`	Sabino Canyon Obs. in Arizona, 3 in MPECs 2008-S39, 2008-S42 & 2008-S44 -- 2008 SZ1, 2008 SU1, 2008 SQ1
`H36`	Sandlot Obs. in Kansas, 2 in MPEC 2008-S45 -- 2008 SE, 2005 TR15
`E12`	Siding Spring Survey (SSS) in New South Wales, 5 in MPECs 2008-S40, 2008-S45 & 2008-S46 -- 2008 SS, 2008 SR1, P/2008 R1, 140288, 102873
`691`	Spacewatch 0.9m telescope in Arizona, 11 in MPECs 2008-S43 & 2008-S45 -- 2008 SW1, 2008 RQ24, 2008 RK1, 2008 RJ1, 2008 RG98, 2008 QF, 2006 TN, 2001 CK42, 38239, 190491, 137044
`291`	Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2008-S45 -- 2008 SR, 2008 RH1, 2008 QF, 2007 AT2, 2005 PO, 2003 YG118, 2003 WD158
`H67`	Stonegate Obs. in Michigan, 2 in MPEC 2008-S45 -- 2008 SQ1, 164400
`673`	Table Mtn. Obs. in southern California, 1 in MPEC 2008-S47 -- 205P
`6735`	Jim Young via Table Mtn. Obs. in southern California, 3 in MPECs 2008-S39, 2008-S43 & 2008-S44 -- 2008 SZ1, 2008 SW1, 2008 SQ1
`A98`	Taurus-1 Obs. in Belarus, 4 in MPEC 2008-S45 -- 185851, 16960, 8567, 1620
`F85`	Tiki Obs. in Tahiti, 1 in MPEC 2008-S44 -- 2008 SZ1
`H47`	Vicksburg Obs. in Mississippi, 4 in MPECs 2008-S45 & 2008-S47 -- 189700, 164400, 4179, 205P
`B42`	Vitebsk Obs. in Belarus, 1 in MPEC 2008-S45 -- 164400
`367`	Yatsuka Obs., 1 in MPEC 2008-S47 -- 205P

For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring on 24 September '08

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2358 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
Note that the time horizon for JPL is 100 years from today and for NEODyS is 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

2008 SU1	NEODyS	1200	2046-2090	15	1.32e-08	-4.88	-4.92	0	NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2008/09/23.189 to 2008/09/23.956."
2008 SU1	JPL Sentry	0436	2046-2096	21	4.6e-08	-4.42	-4.85	0	JPL: "Analysis based on 20 observations spanning .76697 days (2008-Sep-23.18852 to 2008-Sep-23.95549)." Diameter approximately 0.446 km. from mean, weighted H=19.4.

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 24 September '08

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

2358	Grabbed MPEC 2008-S49 - Comet C/1999 X3 = 2004 E2 = 2008 K10 (SOHO) - see above
1903	Grabbed MPEC 2008-S48 - Comet P/2008 QP20 (Linear-Hill) - see above
1719	Grabbed MPEC 2008-S46 - Comet P/2008 R1 (Garradd) - see above Grabbed MPEC 2008-S47 - Comet 205P/Giacobini - see above
1200	Noted that NEODyS has posted 2008 SU1 as an impact risk - see above Grabbed MPEC 2008-S45 - Daily Orbit Update - see above
0436	Noted that JPL Sentry has posted 2008 SU1 as an impact risk - see above Grabbed MPEC 2008-S44 - 2008 SZ1 - see above
0201	Grabbed MPEC 2008-S41 - 2008 ST1 - see above Grabbed MPEC 2008-S42 - 2008 SU1 - see above Grabbed MPEC 2008-S43 - 2008 SW1 - see above
0122	Grabbed MPEC 2008-S38 - 2008 SO1 - see above Grabbed MPEC 2008-S39 - 2008 SQ1 - see above Grabbed MPEC 2008-S40 - 2008 SR1 - see above

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