2008-02-04 Tracking News

Contents on 4 February '08

Radar Astrometry -- one object
IAU Minor Planet Center
- NEOCP Activity -- one listing: 1 updated
- New MPECs -- fifteen MPECs
- Observers -- 82 observing facilities
Impact Risk Monitoring -- five objects
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.

Radar Astrometry on 4 February '08

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added the following small-body radar observing work:

Data addition noted at 2333 UTC when the database was dated 4 Feb.

2007 TU24 from Arecibo at Feb. 2.29 (range), 3.28 (velocity) & 3.28 (range) - see links

NEOCP Activity on 4 February '08

The MPC's NEO Confirmation Page has 1 listing: 1 updated

When last checked at 2358 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one updated listing. This was a "one nighter." So far The Tracking News has counted a total of twelve 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 4 February '08

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been fifteen MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-C18 time-stamped "00:15 UT" - Comet C/2007 Y1 (LINEAR) - see below
MPEC 2008-C19 time-stamped "00:18 UT" - Comet C/2008 A1 (McNaught) - see below
MPEC 2008-C20 time-stamped "00:22 UT" - Comet P/2008 A2 (LINEAR) - see below
MPEC 2008-C21 time-stamped "00:25 UT" - Comet C/2008 C1 (Chen-Gao) - see below
MPEC 2008-C22 time-stamped "00:52 UT" - Observations of Comets - see below
MPEC 2008-C23 time-stamped "07:08 UT" - Daily Orbit Update - see below
MPEC 2008-C24 time-stamped "15:24 UT" - 2008 CH1 - see below
MPEC 2008-C25 time-stamped "15:28 UT" - 2008 CJ1 - see below
MPEC 2008-C26 time-stamped "15:32 UT" - 2008 CL1 - see below
MPEC 2008-C27 time-stamped "15:37 UT" - 2008 CM1 - see below
MPEC 2008-C28 time-stamped "15:39 UT" - 2008 CN1 - see below
MPEC 2008-C29 time-stamped "19:44 UT" - 2008 CQ1 - see below
MPEC 2008-C30 time-stamped "19:49 UT" - 2008 CR1 - see below
MPEC 2008-C31 time-stamped "19:53 UT" - 2008 CS1 - see below
MPEC 2008-C32 time-stamped "22:16 UT" - 2008 CT1

MPEC 2008-C32 - "22:16 UT" - 2008 CT1

K08C01T 2008 CT1 (small asteroid, Earth MOID=0.1 LD, H=27.7 ~10m) was discovered at 0802 UT on 3 Feb. by LINEAR, which observed it at Feb. 3.33-38p4. The discovery was confirmed by Bergen-Enkheim Obs. (Feb. 3.96-98p4) and KLENOT (Feb. 3.98p5). This object is now within ten lunar distances (LD) of Earth, reaching 0.3 LD on 5 Feb. (INTRUDER).

MPEC 2008-C31 - "19:53 UT" - 2008 CS1

K08C01S 2008 CS1 (risk-listed, H=20.2 ~309m) was discovered at 1202 UT on 3 Feb. by the Catalina Sky Survey (CSS), which observed it at Feb. 3.50-55p8. The discovery was confirmed by KLENOT (Feb. 4.06p7).

MPEC 2008-C30 - "19:49 UT" - 2008 CR1

K08C01R 2008 CR1 (i=45.2°, H=19.4 ~446m) was discovered at 0746 UT on 3 Feb. by the CSS, which observed it at Feb. 3.32-37p8 and 3.42-43p4. The discovery was confirmed by Sabino Canyon Obs. (Feb. 3.38-39p3), KLENOT (Feb. 4.01-02p7), McDonald Obs. (Feb. 4.30-31p3), and Mt. John Obs. (Feb. 4.54p4).

MPEC 2008-C29 - "19:44 UT" - 2008 CQ1

K08C01Q 2008 CQ1 (H=19.5 ~426m) was discovered at 0704 UT on 3 Feb. by the Mt. Lemmon Survey (MLS), which observed it at Feb. 3.25-32p8. The discovery was confirmed by the Spacewatch 0.9m telescope (Jan. 11.34-37p3), Gaisberg Obs. (Feb. 3.82-84p3 at V=22.2), and KLENOT (Feb. 3.88p2).

MPEC 2008-C28 - "15:39 UT" - 2008 CN1

K08C01N 2008 CN1 (H=20.7 ~245m) was discovered at 1124 UT on 2 Feb. by the CSS, which observed it at Feb. 2.48-50p4. The discovery was confirmed by Jim Young via Table Mtn. Obs. (Feb. 2.52-53p4), Guidestar Obs. (Feb. 3.01-03p4), Gaisberg Obs. (Feb. 3.04-05p3), Alter Satzberg Obs. (Feb. 3.10-12p4), Modra Obs. (Feb. 3.16p3), Sabino Canyon Obs. (Feb. 3.37p4), MLS (Feb. 3.44-45p4), LINEAR (Feb. 3.46-51p3), McDonald Obs. (Feb. 3.46-47p3 & 4.46p3), Desert Moon Obs. (Feb. 3.51-53p5), Lindenberg Obs. (Feb. 4.00-01p4), and KLENOT (Feb. 4.05p5).

MPEC 2008-C27 - "15:37 UT" - 2008 CM1

K08C01M 2008 CM1 (i=55.0°, H=19.1 ~513m) was discovered at 1111 UT on 2 Feb. by the CSS, which observed it at Feb. 2.44-47p8 and 3.38-40p4. The discovery was confirmed by Gaisberg Obs. (Feb. 2.95-96p3), Gnosca Obs. (Feb. 2.96-98p2), Guidestar Obs. (Feb. 2.98-00p4), Alter Satzberg Obs. (Feb. 2.98-99p3), Modra Obs. (Feb. 3.10-11p2), Astronomical Research Obs. (ARO) (Feb. 3.31-32p3), Sabino Canyon Obs. (Feb. 3.31-32p3), Desert Moon Obs. (Feb. 3.41-45p3), Inastars Obs. (Feb. 3.93-94p3), KLENOT (Feb. 3.97-98p7), and McDonald Obs. (Feb. 4.32p3).

MPEC 2008-C26 - "15:32 UT" - 2008 CL1

K08C01L 2008 CL1 (H=19.1 ~513m) was discovered at 1038 UT on 2 Feb. by LINEAR, which observed it at Feb. 2.44-48p4. The discovery was confirmed by Alter Satzberg Obs. (Feb. 3.13-15p6), Modra Obs. (Feb. 3.17-18p3), Sabino Canyon Obs. (Feb. 3.40-41p3), McDonald Obs. (Feb. 3.47-49p3 & 4.50-52p3), and Lindenberg Obs. (Feb. 3.98-99p3).

MPEC 2008-C25 - "15:28 UT" - 2008 CJ1

K08C01J 2008 CJ1 (small asteroid, H=23.5 ~68m) was discovered at 0937 UT on 2 Feb. by the MLS, which observed it at Feb. 2.40-44p8, 2.48p1, and 3.22p4. The discovery was confirmed by KLENOT (Feb. 3.87p3).

MPEC 2008-C24 - "15:24 UT" - 2008 CH1

K08C01H 2008 CH1 (borderline-small, H=21.9 ~141m) was discovered at 0431 UT on 2 Feb. by the Spacewatch 0.9m, which observed it at Feb. 2.19-23p3. The discovery was confirmed by Gaisberg Obs. (Feb. 2.88-89p3), ARO (Feb. 3.22-23p3), the Spacewatch 1.8m telescope (Feb. 3.29-30p2), and KLENOT (Feb. 3.95-96p6).

<< DOU on 4 Feb. '08 >> MPEC 2008-C23 - "07:08 UT" - Daily Orbit Update

Observations of risk-listed objects
K08C00K 2008 CK (small asteroid, arc=1 day, H=26.1 ~20m) from CSS (Feb. 3.19-21p4)
K08B18T 2008 BT18 (arc=4 days, H=18.3 ~741m) from Naef Obs. (Feb. 3.86-88p2) and KLENOT (Feb. 3.94-97p13)
K08B15D 2008 BD15 (arc=5 days, H=20.6 ~257m) from Dresden Obs. (Feb. 2.88-90p10 & 3.86-88p6), Hormersdorf Obs. (Feb. 2.98p5), CSS (Feb. 3.43-45p4), Eschenberg Obs. (Feb. 3.78p7), Guidestar Obs. (Feb. 3.84-85p5), KLENOT (Feb. 3.86p8), and Lindenberg Obs. (Feb. 3.92p3)
K08A04F 2008 AF4 (arc=25 days, H=19.8 ~371m) from Dresden Obs. (Feb. 2.91-93p6), Spacewatch 1.8m (Feb. 3.26-27p2), Guidestar Obs. (Feb. 3.80-81p3), KLENOT (Feb. 3.93-94p6), and Lindenberg Obs. (Feb. 3.95p3)
Observations of small asteroids (H>22.0)
K08C00Q 2008 CQ (arc=1 day, H=25.4 ~28m) from ARO (Feb. 3.29-30p3), LINEAR (Feb. 3.33-36p3), and CSS (Feb. 3.38-43p7)
K08C00P 2008 CP (arc=2 days, H=23.7 ~62m) from ARO (Feb. 3.19-20p3) and KLENOT (Feb. 3.89p6)
K08C00O 2008 CO (arc=2 days, H=22.7 ~98m) from ARO (Feb. 3.20-21p3) and KLENOT (Feb. 3.91-92p7)
Observations of other objects
PLS6344 6344 P-L (Q=4.678 AU, arc=3 opp, H=20.5 ~269m) from CSS (Feb. 3.27-29p4)
K08C00M 2008 CM (i=36.3°, arc=2 days, H=16.9 ~1.41 km) from CSS (Feb. 3.08-10p4) and KLENOT (Feb. 3.75-76p8)
K08B16H 2008 BH16 (arc=5 days, H=20.6 ~257m) from Lindenberg Obs. (Feb. 3.93p3)
K08A33M 2008 AM33 (arc=19 days, H=21.4 ~178m) from LINEAR (Feb. 3.41-45p4)
K08A28V 2008 AV28 (arc=46 days, H=19.6 ~407m) from KLENOT (Feb. 3.84-85p7)
K08A26U 2008 AU26 (arc=35 days, H=21.0 ~214m) from LINEAR (Feb. 3.31-33p3), Desert Moon Obs. (Feb. 3.35-38p3), and CSS (Feb. 3.38-39p3)
K08A01G 2008 AG1 (arc=28 days, H=21.2 ~195m) from Desert Moon Obs. (Feb. 3.27-31p3)
K07RE7T 2007 RT147 (arc=145 days, H=18.2 ~776m) from KLENOT (Feb. 3.76-77p7)
K06SD4P 2006 SP134 (arc=3 opp, H=16.9 ~1.41 km) from Andrew Becker via Apache Point Obs. (2006 Oct. 16.35p2 & 2006 Nov. 1.25p2)
K05YC8V 2005 YV128 (arc=3 opp, H=20.5 ~269m) from Spacewatch 1.8m (Feb. 3.33-34p3)
K05S01R 2005 SR1 (arc=71 days, H=19.3 ~467m) from Becker/Apache Point (2005 Oct. 27.30p2, 2005 Oct. 31.26p2, 2005 Nov. 1.26p2, 2005 Nov. 3.28p2, 2005 Nov. 6.26p2 at V=22.6 & 2005 Nov. 9.32p2)
K05N07B 2005 NB7 (arc=3 opp, H=18.6 ~645m) from KLENOT (Feb. 3.82-83p9)
K04C02R 2004 CR2 (arc=2 opp, H=19.5 ~426m) from Spacewatch 0.9m (Feb. 3.38-41p3)
K04A01R 2004 AR1 (arc=3 opp, H=19.8 ~371m) from CSS (Feb. 3.43-45p4)
K03C00A 2003 CA (arc=4 opp, H=19.0 ~537m) from Spacewatch 1.8m (Feb. 3.31p3)
K02A31V 2002 AV31 (arc=3 opp, H=20.5 ~269m) from CSS (Feb. 3.43-44p4)
J98B10B 1998 BB10 (arc=5 opp, H=20.3 ~295m) from LINEAR (Feb. 3.15-19p4)
H3561 173561 2000 YV137 from Inastars Obs. (Feb. 3.89-90p4)
H0891 170891 2004 TY16 from LINEAR (Feb. 3.22-26p4)
G2510 162510 2000 QW69 from Desert Moon Obs. (Feb. 3.54-55p4)
F4347 154347 2002 XK4 from LINEAR (Feb. 3.27-32p3)
D8013 138013 2000 CN101 from Inastars Obs. (Feb. 3.99-00p3)
D7924 137924 2000 BD19 from Inastars Obs. (Feb. 3.84-85p4)
90403 90403 2003 YE45 from CSS (Feb. 3.14-15p2)
86324 86324 1999 WA2 from LINEAR (Feb. 3.15-20p5)
22099 22099 2000 EX106 from Spacewatch 0.9m (Feb. 3.28-31p3)
11398 11398 1998 YP11 from Spacewatch 0.9m (Feb. 3.34-37p3) and LINEAR (Feb. 3.34-39p5)
09400 9400 1994 TW1 from LINEAR (Feb. 3.41-46p3)
07889 7889 1994 LX from Jarnac Obs. (Feb. 3.52-55p3)
04450 4450 Pan (1987 SY) from LINEAR (Feb. 3.31-33p3) and CSS (Feb. 3.38-39p4)
01620 1620 Geographos (1951 RA) from Panker Obs. (Feb. 2.92-93p3) and CSS (Feb. 3.30-32p4)

MPEC 2008-C22 - "00:52 UT" - Observations of Comets

CK07W030 C/2007 W3 (LINEAR) from Kiev Comet Station (Jan. 16.82-85p5) and Montana Blanca Obs. (Feb. 2.84p1)
CK07W010 C/2007 W1 (Boattini) from Smolyan Obs. (Jan. 8.08p2, 12.13-15p5 & 13.11-13p5), Ageo Obs. (Jan. 25.79-80p3), Auckland Obs. (Feb. 1.52-53p3), and LINEAR (Feb. 2.40-45p5)
PK07V11Q P/2007 VQ11 from Great Shefford Obs. (Feb. 1.82-84p3), Buchloe Obs. (Feb. 2.81-82p3), and Schiaparelli Obs. (Feb. 2.84p1 & 2.92p1)
CK07U010 C/2007 U1 (LINEAR) from Hiratsuka Obs. (Jan. 27.45-46p3), Chante-Perdrix Obs. (Jan. 31.80-81p3), Schiaparelli Obs. (Feb. 2.98p1), and CSS (Feb. 3.14-16p4)
PK07T060 P/2007 T6 (Catalina) from Hiratsuka Obs. (Jan. 27.53p3), Montcabre Obs. (Jan. 28.94p3), Nazaret Obs. (Jan. 29.96-98p3), Atlante Obs. (Jan. 30.97-99p3), CSS (Jan. 31.26-28p4), Buchloe Obs. (Feb. 2.84p3), and LINEAR (Feb. 3.30-32p3)
CK07T050 C/2007 T5 (Gibbs) from Nazaret Obs. (Jan. 29.93-95p3) and Ingenio Obs. (Feb. 1.92p1)
CK07T010 C/2007 T1 (McNaught) from Auckland Obs. (Jan. 26.47-48p3 & Feb. 1.49p3), RAS Obs. Moorook (Jan. 27.49p2), and Castlemaine Obs. (Feb. 2.48-50p3)
CK07S020 C/2007 S2 (Lemmon) from Ametlla del Valles Obs. (Jan. 29.03p4), Schiaparelli Obs. (Jan. 29.08-12p2), and LINEAR (Feb. 3.30-32p3)
CK07Q030 C/2007 Q3 (Siding Spring) from Auckland Obs. (Jan. 30.40p1 & Feb. 1.50-51p3)
PK07H010 P/2007 H1 (McNaught) from Schiaparelli Obs. (Dec. 24.86p1 & Jan. 26.79-82p2), Smolyan Obs. (Jan. 9.75-76p3 & 10.75-76p3), Ageo Obs. (Jan. 26.42-43p2), Mataro Obs. (Jan. 27.78-80p3), LINEAR (Feb. 1.08-13p5), and Buchloe Obs. (Feb. 2.77p3)
CK07G010 C/2007 G1 (LINEAR) from Szamotuly-Galowo Obs. (Jan. 9.20-21p2), Smolyan Obs. (Jan. 13.17-18p2), and Ageo Obs. (Jan. 19.86-87p2 & 25.84-85p2)
CK07D030 C/2007 D3 (LINEAR) from Ageo Obs. (Jan. 10.71p2) and Schiaparelli Obs. (Jan. 29.10-14p2)
PK07C020 P/2007 C2 (Catalina) from Hiratsuka Obs. (Jan. 27.49-50p3), Ametlla del Valles Obs. (Jan. 29.01p2), Schiaparelli Obs. (Jan. 29.08-12p2), and LINEAR (Feb. 2.27-32p5)
CK07B020 C/2007 B2 (Skiff) from Smolyan Obs. (Jan. 13.07-10p7), Ageo Obs. (Jan. 25.77-78p3), Monte Deva Obs. (Jan. 27.07-08p4 & 30.09p5), and Auckland Obs. (Feb. 1.53p3)
CK06W030 C/2006 W3 (Christensen) from Schiaparelli Obs. (Dec. 27.97p1, 28.09p1 & Jan. 26.99-02p2), LINEAR (Jan. 29.14-19p5), Monte Deva Obs. (Jan. 29.87-88p4), and La Vara Obs. (Jan. 29.90-91p3)
CK06S050 C/2006 S5 (Hill) from Szeged Obs. (Jan. 24.83-85p4), Hiratsuka Obs. (Jan. 27.47-48p3), Madonna di Dossobuono Obs. (Jan. 28.91-92p3), Murcia Obs. (Jan. 28.95p3 & 29.92p3), Schiaparelli Obs. (Jan. 29.00p1 & 29.07p1), Pinsoro Obs. (Jan. 29.03-04p3), CAST Obs. (Jan. 29.81p1), Monte Deva Obs. (Jan. 30.05-06p5 & Feb. 2.85-87p5), Auckland Obs. (Feb. 1.51p3), Vicksburg Obs. (Feb. 2.17p2), and Linceo Obs. (Feb. 2.93-96p3)
CK06S030 C/2006 S3 (LONEOS) from Schiaparelli Obs. (Dec. 24.88p1 & Feb. 2.76p1)
CK06K040 C/2006 K4 (NEAT) from Auckland Obs. (Jan. 26.48p3 & Feb. 1.55p3)
CK06K030 C/2006 K3 (McNaught) from Schiaparelli Obs. (Dec. 27.99p1 & Jan. 26.85p1)
CK06K010 C/2006 K1 (McNaught) from Schiaparelli Obs. (Dec. 24.93p1 & Jan. 28.85p1) and CSS (Jan. 18.20-21p3)
CK05L030 C/2005 L3 (McNaught) from Szamotuly-Galowo Obs. (Jan. 9.20p2), Smolyan Obs. (Jan. 12.16-18p7), and Ageo Obs. (Jan. 25.82-83p3 & 26.84-85p2)
PK04F030 P/2004 F3 (NEAT) from Schiaparelli Obs. (Jan. 7.88p1, 7.93p1, 26.84p1 & 26.90p1)
0195P 195P/Hill from Schiaparelli Obs. (Jan. 28.91p1, Feb. 2.86p1 & 2.98p1)
0194P 194P/LINEAR from Schiaparelli Obs. (Dec. 29.80p1), Chante-Perdrix Obs. (Jan. 28.90p1), and Nazaret Obs. (Jan. 29.03-05p3)
0192P 192P/Shoemaker-Levy 1 from Schiaparelli Obs. (Dec. 29.77p1 & Jan. 26.77-79p2), Ageo Obs. (Jan. 26.39-40p3), and Buchloe Obs. (Feb. 2.75p3)
0191P 191P/McNaught from Schiaparelli Obs. (Jan. 26.93-96p2) and LINEAR (Feb. 2.15-20p5)
0188P 188P/LINEAR-Mueller from Chante-Perdrix Obs. (Jan. 25.82-84p3 & 28.76-77p3), Schiaparelli Obs. (Jan. 26.80-81p2), LINEAR (Jan. 30.08-13p5), and CSS (Jan. 30.09-10p4)
0180P 180P/NEAT from Paus Obs. (Jan. 26.02-05p2 & 31.96p1), Atlante Obs. (Jan. 31.06p2), CSS (Feb. 1.26-28p4), and El Olivo Obs. (Feb. 2.02-04p3)
0173P 173P/Mueller 5 from CAST Obs. (Jan. 25.81p1), Ageo Obs. (Jan. 27.67-68p3), Schiaparelli Obs. (Jan. 28.00p1 & 29.06p1), LINEAR (Jan. 30.28-33p5), and Ingenio Obs. (Feb. 1.90p1)
0150P 150P/LONEOS from Schiaparelli Obs. (Dec. 27.98p1, 28.04p1, Jan. 6.96p1 & 26.89p1)
0139P 139P/Vaisala-Oterma from CSS (Jan. 18.09-11p4) and LINEAR (Jan. 29.09-12p3)
0136P 136P/Mueller 3 from Chante-Perdrix Obs. (Jan. 25.80-81p3 & 28.78-79p2), Schiaparelli Obs. (Jan. 26.78-80p2), and Buchloe Obs. (Feb. 2.76p1)
0128P 128P/Shoemaker-Holt 1 from CAST Obs. (Jan. 29.80p1) and LINEAR (Feb. 2.22-27p9)
0124P 124P/Mrkos from Smolyan Obs. (Jan. 13.04-06p4), CAST Obs. (Jan. 29.86p1), Siegen Obs. (Jan. 29.97-98p3), Monte Deva Obs. (Jan. 30.07-08p5), and Buchloe Obs. (Feb. 2.86p3)
0117P 117P/Helin-Roman-Alu 1 from Schiaparelli Obs. (Jan. 26.84p1 & 26.89p1), Chante-Perdrix Obs. (Jan. 28.80-81p3), La Vara Obs. (Jan. 29.80-82p3), Buchloe Obs. (Feb. 2.78-79p3), and LINEAR (Feb. 3.09-14p5)
0113P 113P/Spitaler from CSS (Jan. 18.09-11p4) and LINEAR (Jan. 29.08-12p4 & 30.09-13p4)
0110P 110P/Hartley 3 from Szeged Obs. (Jan. 24.82-83p3), Tucci Obs. (Jan. 27.83-88p3), Laietania Obs. (Jan. 28.87-92p3), Murcia Obs. (Jan. 28.90-91p3), Schiaparelli Obs. (Jan. 28.92p1 & 28.99p1), Mt. Tuffley Obs. (Jan. 28.00-01p3), LINEAR (Jan. 29.21-26p4), CAST Obs. (Jan. 29.78p1), La Vara Obs. (Jan. 29.93p3), Monte Deva Obs. (Jan. 29.98p5), Brainerd Obs. (Feb. 1.08-09p3), and Vicksburg Obs. (Feb. 2.13-15p2)
0108P 108P/Ciffreo from Schiaparelli Obs. (Jan. 1.04p1 & 1.09p1), Buchloe Obs. (Jan. 10.00p3 & Feb. 2.85p3), Paus Obs. (Jan. 28.97p1), and CSS (Feb. 1.17-19p4)
0093P 93P/Lovas 1 from Szeged Obs. (Jan. 24.76-77p3), Geisei Obs. (Jan. 25.44p1), Schiaparelli Obs. (Jan. 26.87p1 & 26.92p1), San Vito Obs. (Jan. 28.73p2), Guadarrama Obs. (Jan. 28.79p2), Pinsoro Obs. (Jan. 28.85-86p3), Monte Deva Obs. (Jan. 28.92-93p5), Mt. Tuffley Obs. (Jan. 28.98-99p3), CAST Obs. (Jan. 29.78p1), and La Vara Obs. (Jan. 29.89p3)
0070P 70P/Kojima from Ageo Obs. (Jan. 19.83-84p3) and LINEAR (Jan. 30.47-52p5)
0065P 65P/Gunn from Schiaparelli Obs. (Jan. 29.76p1) and Nazaret Obs. (Jan. 30.90-92p3)
0050P 50P/Arend from Szeged Obs. (Jan. 24.78-79p2), Geisei Obs. (Jan. 25.47p1), Casal Lumbroso Obs. (Jan. 26.79p1), Schiaparelli Obs. (Jan. 26.97-00p2), Mataro Obs. (Jan. 27.85-86p3), Pinsoro Obs. (Jan. 28.87-88p3), and Nazaret Obs. (Jan. 28.94-95p3)
0046P 46P/Wirtanen from Geisei Obs. (Jan. 14.44p2, 24.39-40p2 & 25.41p2), Szeged Obs. (Jan. 24.74-75p8), Ageo Obs. (Jan. 26.45p2), Schiaparelli Obs. (Jan. 26.78-81p2), Mataro Obs. (Jan. 27.75p3), La Murta Obs. (Jan. 28.77p3), CAST Obs. (Jan. 29.77p1), La Vara Obs. (Jan. 29.79-80p3), Monte Deva Obs. (Jan. 29.86p5), and Buchloe Obs. (Feb. 2.78p3)
0029P 29P/Schwassmann-Wachmann 1 from Ametlla del Valles Obs. (Dec. 4.98p3, Jan. 13.02-03p2, 14.02-04p3 & 26.89p3), Geisei Obs. (Dec. 30.50p1, Jan. 4.54p1, 6.54p1, 9.56p1, 12.57p1, 16.64p1, 24.42p1, 25.48p1 & 31.46-47p2), Smolyan Obs. (Jan. 11.99-04p10), Szeged Obs. (Jan. 24.80-81p3), Gualba Obs. (Jan. 27.96p2, 28.76p4 & 29.81p3), La Murta Obs. (Jan. 28.79-80p3), Murcia Obs. (Jan. 28.89p1, 28.94-95p2 & 29.90p3), Schiaparelli Obs. (Jan. 28.93p1 & 29.02p1), Pinsoro Obs. (Jan. 29.00-02p3 & 30.00-01p3), CAST Obs. (Jan. 29.79p1), Guadarrama Obs. (Jan. 29.82p2), Balzaretto Obs. (Jan. 29.84-86p3), Montcabre Obs. (Jan. 29.85p3 & 31.88p3), Nazaret Obs. (Jan. 29.91-92p3), La Vara Obs. (Jan. 29.95p2), Monte Deva Obs. (Jan. 29.99-00p5), Chante-Perdrix Obs. (Jan. 31.86-87p3 & Feb. 2.85-86p2), Brainerd Obs. (Feb. 1.05-06p4), El Olivo Obs. (Feb. 1.90p3), Buchloe Obs. (Feb. 2.83p3), Thompsonville Obs. (Feb. 3.13-14p6), and Stammersdorf Obs. (Feb. 3.83-84p4)
0026P 26P/Grigg-Skjellerup from Auckland Obs. (Jan. 26.55-56p3 & Feb. 1.56p3) and Kambah Obs. (Jan. 26.70p2)
0017P 17P/Holmes from Schiaparelli Obs. (Dec. 27.97p1, 28.05p1 & Jan. 26.94-97p2), Geisei Obs. (Jan. 3.49p1, 4.51-55p2, 6.51p1, 9.54p1, 14.47p1, 24.43p1, 25.43p1 & 31.45p1), Smolyan Obs. (Jan. 8.90-94p9, 9.83-86p6, 10.83-86p10, 11.91-97p12 & 13.94-97p6), Hamamatsu-Yuto Obs. (Jan. 27.43-44p4 & 31.48-49p3), Mataro Obs. (Jan. 27.87-88p3), Gualba Obs. (Jan. 27.96-97p2), Pinsoro Obs. (Jan. 28.82-83p3), Nazaret Obs. (Jan. 28.92-93p3, 29.88-90p3 & 30.88-89p3), Monte Deva Obs. (Jan. 28.95-96p4), La Vara Obs. (Jan. 29.87-88p3), Chante-Perdrix Obs. (Jan. 31.77-78p3), Montcabre Obs. (Jan. 31.83-84p3), El Olivo Obs. (Feb. 1.89p3), LINEAR (Feb. 2.09-14p3), Carmelita Obs. (Feb. 2.75-76p3), Buchloe Obs. (Feb. 2.80p3), Tosa Obs. (Feb. 3.49p3), and Stammersdorf Obs. (Feb. 3.80-81p3)
0008P 8P/Tuttle from Ametlla del Valles Obs. (Dec. 11.84-86p4), Schiaparelli Obs. (Dec. 27.97p1 & 28.04p1), Geisei Obs. (Jan. 3.48p1, 4.51p1, 6.52p1, 9.53-54p2, 12.54p2, 14.46p1, 24.40-41p2, 25.40p1 & 31.40p1), Smolyan Obs. (Jan. 8.88-89p12, 9.80-81p15 & 10.81-82p7), Ageo Obs. (Jan. 26.46-47p2 & 27.38-39p4), Tucci Obs. (Jan. 27.80-81p3), La Murta Obs. (Jan. 28.77p3), Nazaret Obs. (Jan. 29.83-87p3), and Auckland Obs. (Feb. 1.49p3)
0007P 7P/Pons-Winnecke from Ageo Obs. (Jan. 27.73p3), Montcabre Obs. (Jan. 29.05p1, 29.11p1 & 29.17p1), and Nazaret Obs. (Jan. 30.01-04p3)

MPEC 2008-C21 - "00:25 UT" - Comet C/2008 C1 (Chen-Gao)

CK08C010 C/2008 C1 (i=61.8°, q=1.262 AU, TP=2008 Apr. 16.835 TT) from Xingming Obs. (Jan. 30.58p1, 31.59p1, Feb. 1.67p1 & 2.65-67p4), ARO (Feb. 3.01-02p3), Desert Moon Obs. (Feb. 3.07-08p5), LINEAR (Feb. 3.09-14p5), Junk Bond Obs. (Feb. 3.13-16p6), Table Mtn. Obs. (Feb. 3.14-16p4), RAS Obs. Mayhill (Feb. 3.15p2), Tosa Obs. (Feb. 3.44-48p3), Stammersdorf Obs. (Feb. 3.74-77p4), Ondrejov Obs. (Feb. 3.76-77p6), and Ageo Obs. (Feb. 3.83-84p3)

MPEC 2008-C20 - "00:22 UT" - Comet P/2008 A2 (LINEAR)

PK08A020 P/2008 A2 (LINEAR) (q=1.305 AU, Q=5.084 AU, TP=2008 June 12.005 TT) from Ageo Obs. (Jan. 27.62-63p4), San Marcello Pistoiese Obs. (Jan. 28.77-78p3), Schiaparelli Obs. (Jan. 29.03p1 & Feb. 2.94p1), Nazaret Obs. (Jan. 30.95-96p3), Chante-Perdrix Obs. (Feb. 2.82-83p3), and Buchloe Obs. (Feb. 2.83p3)

MPEC 2008-C19 - "00:18 UT" - Comet C/2008 A1 (McNaught)

CK08A010 C/2008 A1 (McNaught) (i=82.5°, q=1.073 AU, TP=2008 Sept. 29.098 TT) from AAAA Buenos Aires Obs. (Jan. 17.06-11p3, 17.16p1, 20.13-17p2 & 20.22p1), Castlemaine Obs. (Jan. 28.49-52p3), and Auckland Obs. (Feb. 1.44p3 & 1.54p3)

MPEC 2008-C18 - "00:15 UT" - Comet C/2007 Y1 (LINEAR)

CK07Y010 C/2007 Y1 (LINEAR) (i=110.2°, q=3.341 AU, TP=2008 Mar. 19.3084 TT) from Auckland Obs. (Jan. 26.49p3), Ageo Obs. (Jan. 26.75-77p3), Schiaparelli Obs. (Jan. 29.11-14p2), CSS (Feb. 2.28-30p4), and Buchloe Obs. (Feb. 2.85-86p3)

Observers on 4 February '08

A total of 82 observing facilities appear in today's MPECs.

Code	Observer / observatory
`834`	AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2008-C19 -- C/2008 A1
`349`	Ageo Obs. in Japan, 15 in MPECs 2008-C18, 2008-C20, 2008-C21 & 2008-C22 -- C/2008 C1, P/2008 A2, C/2007 Y1, C/2007 W1, P/2007 H1, C/2007 G1, C/2007 D3, C/2007 B2, C/2005 L3, 192P, 173P, 70P, 46P, 8P, 7P
`B03`	Alter Satzberg Obs. in Austria, 3 in MPECs 2008-C26, 2008-C27 & 2008-C28 -- 2008 CN1, 2008 CM1, 2008 CL1
`B37`	Ametlla del Valles Obs. in Spain, 4 in MPEC 2008-C22 -- C/2007 S2, P/2007 C2, 29P, 8P
`7054`	Andrew Becker via Apache Point Obs. in New Mexico, 2 in MPEC 2008-C23 -- 2006 SP134, 2005 SR1
`251`	Arecibo in Puerto Rico, 1 in radar -- 2007 TU24
`H55`	Astronomical Research Obs. (ARO) in Illinois, 6 in MPECs 2008-C21, 2008-C23, 2008-C24 & 2008-C27 -- 2008 CQ, 2008 CP, 2008 CO, 2008 CM1, 2008 CH1, C/2008 C1
`J51`	Atlante Obs. in the Canary Islands, 2 in MPEC 2008-C22 -- P/2007 T6, 180P
`467`	Auckland Obs. in New Zealand, 10 in MPECs 2008-C18, 2008-C19 & 2008-C22 -- C/2008 A1, C/2007 Y1, C/2007 W1, C/2007 T1, C/2007 Q3, C/2007 B2, C/2006 S5, C/2006 K4, 26P, 8P
`A81`	Balzaretto Obs. in Italy, 1 in MPEC 2008-C22 -- 29P
`A74`	Bergen-Enkheim Obs. in Germany, 1 in MPEC 2008-C32 -- 2008 CT1
`726`	Brainerd Obs. in Minnesota, 2 in MPEC 2008-C22 -- 110P, 29P
`215`	Buchloe Obs. in Germany, 13 in MPECs 2008-C18, 2008-C20 & 2008-C22 -- P/2008 A2, C/2007 Y1, P/2007 VQ11, P/2007 T6, P/2007 H1, 192P, 136P, 124P, 117P, 108P, 46P, 29P, 17P
`235`	CAST Obs. in Italy, 8 in MPEC 2008-C22 -- C/2006 S5, 173P, 128P, 124P, 110P, 93P, 46P, 29P
`B20`	Carmelita Obs. in Spain, 1 in MPEC 2008-C22 -- 17P
`B53`	Casal Lumbroso Obs., 1 in MPEC 2008-C22 -- 50P
`E00`	Castlemaine Obs. in Victoria, 2 in MPECs 2008-C19 & 2008-C22 -- C/2008 A1, C/2007 T1
`703`	Catalina Sky Survey (CSS) in Arizona, 24 in MPECs 2008-C18, 2008-C22, 2008-C23, 2008-C27, 2008-C28, 2008-C30 & 2008-C31 -- 6344 P-L, 2008 CS1, 2008 CR1, 2008 CQ, 2008 CN1, 2008 CM1, 2008 CM, 2008 CK, 2008 BD15, 2008 AU26, C/2007 Y1, C/2007 U1, P/2007 T6, C/2006 K1, 2004 AR1, 2002 AV31, 90403, 4450, 1620, 188P, 180P, 139P, 113P, 108P
`A77`	Chante-Perdrix Obs. in France, 8 in MPECs 2008-C20 & 2008-C22 -- P/2008 A2, C/2007 U1, 194P, 188P, 136P, 117P, 29P, 17P
`448`	Desert Moon Obs. in New Mexico, 6 in MPECs 2008-C21, 2008-C23, 2008-C27 & 2008-C28 -- 2008 CN1, 2008 CM1, C/2008 C1, 2008 AU26, 2008 AG1, 162510
`639`	Dresden Obs. in Germany, 2 in MPEC 2008-C23 -- 2008 BD15, 2008 AF4
`J36`	El Olivo Obs. in Spain, 3 in MPEC 2008-C22 -- 180P, 29P, 17P
`151`	Eschenberg Obs. in Switzerland, 1 in MPEC 2008-C23 -- 2008 BD15
`B21`	Gaisberg Obs. in Austria, 4 in MPECs 2008-C24, 2008-C27, 2008-C28 & 2008-C29 -- 2008 CQ1, 2008 CN1, 2008 CM1, 2008 CH1
`372`	Geisei Obs. in Japan, 6 in MPEC 2008-C22 -- 93P, 50P, 46P, 29P, 17P, 8P
`143`	Gnosca Obs. in Switzerland, 1 in MPEC 2008-C27 -- 2008 CM1
`J95`	Great Shefford Obs. in England, 1 in MPEC 2008-C22 -- P/2007 VQ11
`458`	Guadarrama Obs. in Spain, 2 in MPEC 2008-C22 -- 93P, 29P
`442`	Gualba Obs. in Spain, 2 in MPEC 2008-C22 -- 29P, 17P
`A17`	Guidestar Obs. in Germany, 4 in MPECs 2008-C23, 2008-C27 & 2008-C28 -- 2008 CN1, 2008 CM1, 2008 BD15, 2008 AF4
`379`	Hamamatsu-Yuto Obs. in Japan, 1 in MPEC 2008-C22 -- 17P
`D88`	Hiratsuka Obs., 4 in MPEC 2008-C22 -- C/2007 U1, P/2007 T6, P/2007 C2, C/2006 S5
`A35`	Hormersdorf Obs. in Germany, 1 in MPEC 2008-C23 -- 2008 BD15
`B15`	Inastars Obs. in Germany, 4 in MPECs 2008-C23 & 2008-C27 -- 2008 CM1, 173561, 138013, 137924
`J39`	Ingenio Obs. in the Canary Islands, 2 in MPEC 2008-C22 -- C/2007 T5, 173P
`G92`	Jarnac Obs. in Arizona, 1 in MPEC 2008-C23 -- 7889
`701`	Junk Bond Obs. in Arizona, 1 in MPEC 2008-C21 -- C/2008 C1
`246`	KLENOT in the Czech Republic, 17 in MPECs 2008-C23, 2008-C24, 2008-C25, 2008-C27, 2008-C28, 2008-C29, 2008-C30, 2008-C31 & 2008-C32 -- 2008 CT1, 2008 CS1, 2008 CR1, 2008 CQ1, 2008 CP, 2008 CO, 2008 CN1, 2008 CM1, 2008 CM, 2008 CJ1, 2008 CH1, 2008 BT18, 2008 BD15, 2008 AV28, 2008 AF4, 2007 RT147, 2005 NB7
`415`	Kambah Obs. in the Australian Capital Territory, 1 in MPEC 2008-C22 -- 26P
`585`	Kiev Comet Station in the Ukraine, 1 in MPEC 2008-C22 -- C/2007 W3
`704`	LINEAR in New Mexico, 30 in MPECs 2008-C21, 2008-C22, 2008-C23, 2008-C26, 2008-C28 & 2008-C32 -- 2008 CT1, 2008 CQ, 2008 CN1, 2008 CL1, C/2008 C1, 2008 AU26, 2008 AM33, C/2007 W1, P/2007 T6, C/2007 S2, P/2007 H1, P/2007 C2, C/2006 W3, 1998 BB10, 86324, 170891, 154347, 11398, 9400, 4450, 191P, 188P, 173P, 139P, 128P, 117P, 113P, 110P, 70P, 17P
`J76`	La Murta Obs. in Spain, 3 in MPEC 2008-C22 -- 46P, 29P, 8P
`J38`	La Vara Obs. in Spain, 7 in MPEC 2008-C22 -- C/2006 W3, 117P, 110P, 93P, 46P, 29P, 17P
`B57`	Laietania Obs., 1 in MPEC 2008-C22 -- 110P
`J59`	Linceo Obs. in Spain, 1 in MPEC 2008-C22 -- C/2006 S5
`A80`	Lindenberg Obs. in Germany, 5 in MPECs 2008-C23, 2008-C26 & 2008-C28 -- 2008 CN1, 2008 CL1, 2008 BH16, 2008 BD15, 2008 AF4
`560`	Madonna di Dossobuono Obs. in Italy, 1 in MPEC 2008-C22 -- C/2006 S5
`A06`	Mataro Obs. in Spain, 4 in MPEC 2008-C22 -- P/2007 H1, 50P, 46P, 17P
`711`	McDonald Obs. in Texas, 4 in MPECs 2008-C26, 2008-C27, 2008-C28 & 2008-C30 -- 2008 CR1, 2008 CN1, 2008 CM1, 2008 CL1
`118`	Modra Obs. in Slovakia, 3 in MPECs 2008-C26, 2008-C27 & 2008-C28 -- 2008 CN1, 2008 CM1, 2008 CL1
`J46`	Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2008-C22 -- C/2007 W3
`213`	Montcabre Obs. in Spain, 4 in MPEC 2008-C22 -- P/2007 T6, 29P, 17P, 7P
`945`	Monte Deva Obs. in Spain, 9 in MPEC 2008-C22 -- C/2007 B2, C/2006 W3, C/2006 S5, 124P, 110P, 93P, 46P, 29P, 17P
`474`	Mt. John Obs. in New Zealand, 1 in MPEC 2008-C30 -- 2008 CR1
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2008-C25, 2008-C28 & 2008-C29 -- 2008 CQ1, 2008 CN1, 2008 CJ1
`J93`	Mt. Tuffley Obs. in England, 2 in MPEC 2008-C22 -- 110P, 93P
`J78`	Murcia Obs. in Spain, 3 in MPEC 2008-C22 -- C/2006 S5, 110P, 29P
`A13`	Naef Obs. in Switzerland, 1 in MPEC 2008-C23 -- 2008 BT18
`J47`	Nazaret Obs. in Spain, 10 in MPECs 2008-C20 & 2008-C22 -- P/2008 A2, P/2007 T6, C/2007 T5, 194P, 65P, 50P, 29P, 17P, 8P, 7P
`557`	Ondrejov Obs. in the Czech Republic, 1 in MPEC 2008-C21 -- C/2008 C1
`A32`	Panker Obs. in Germany, 1 in MPEC 2008-C23 -- 1620
`B49`	Paus Obs. in Spain, 2 in MPEC 2008-C22 -- 180P, 108P
`J52`	Pinsoro Obs. in Spain, 5 in MPEC 2008-C22 -- C/2006 S5, 93P, 50P, 29P, 17P
`H06`	RAS Obs. Mayhill in New Mexico, 1 in MPEC 2008-C21 -- C/2008 C1
`D90`	RAS Obs. Moorook, 1 in MPEC 2008-C22 -- C/2007 T1
`854`	Sabino Canyon Obs. in Arizona, 4 in MPECs 2008-C26, 2008-C27, 2008-C28 & 2008-C30 -- 2008 CR1, 2008 CN1, 2008 CM1, 2008 CL1
`104`	San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2008-C20 -- P/2008 A2
`233`	San Vito Obs. in Italy, 1 in MPEC 2008-C22 -- 93P
`204`	Schiaparelli Obs. in Italy, 32 in MPECs 2008-C18, 2008-C20 & 2008-C22 -- P/2008 A2, C/2007 Y1, P/2007 VQ11, C/2007 U1, C/2007 S2, P/2007 H1, C/2007 D3, P/2007 C2, C/2006 W3, C/2006 S5, C/2006 S3, C/2006 K3, C/2006 K1, P/2004 F3, 195P, 194P, 192P, 191P, 188P, 173P, 150P, 136P, 117P, 110P, 108P, 93P, 65P, 50P, 46P, 29P, 17P, 8P
`510`	Siegen Obs. in Germany, 1 in MPEC 2008-C22 -- 124P
`071`	Smolyan Obs. in Bulgaria, 9 in MPEC 2008-C22 -- C/2007 W1, P/2007 H1, C/2007 G1, C/2007 B2, C/2005 L3, 124P, 29P, 17P, 8P
`691`	Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2008-C23, 2008-C24 & 2008-C29 -- 2008 CQ1, 2008 CH1, 2004 CR2, 22099, 11398
`291`	Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2008-C23 & 2008-C24 -- 2008 CH1, 2008 AF4, 2005 YV128, 2003 CA
`A97`	Stammersdorf Obs. in Austria, 3 in MPECs 2008-C21 & 2008-C22 -- C/2008 C1, 29P, 17P
`B30`	Szamotuly-Galowo Obs. in Poland, 2 in MPEC 2008-C22 -- C/2007 G1, C/2005 L3
`629`	Szeged Obs. in Hungary, 6 in MPEC 2008-C22 -- C/2006 S5, 110P, 93P, 50P, 46P, 29P
`673`	Table Mtn. Obs. in southern California, 1 in MPEC 2008-C21 -- C/2008 C1
`6735`	Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2008-C28 -- 2008 CN1
`H53`	Thompsonville Obs. in Illinois, 1 in MPEC 2008-C22 -- 29P
`D70`	Tosa Obs., 2 in MPECs 2008-C21 & 2008-C22 -- C/2008 C1, 17P
`J35`	Tucci Obs. in Spain, 2 in MPEC 2008-C22 -- 110P, 8P
`H47`	Vicksburg Obs. in Mississippi, 2 in MPEC 2008-C22 -- C/2006 S5, 110P
`C42`	Xingming Obs. in China, 1 in MPEC 2008-C21 -- C/2008 C1

Impact Risk Monitoring on 4 February '08

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2353 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of 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 CS1	JPL Sentry	2353	2013-2106	42	4.3e-08	-4.36	-4.49	0	JPL: "Analysis based on 15 observations spanning .56140 days (2008-Feb-03.50178 to 2008-Feb-04.06318)." Diameter approximately 0.310 km. from mean, weighted H=20.2.

2008 CK	JPL Sentry	1547	R E M O V E D						JPL: Risk listing removed at 1046 UTC.

2008 BT18	NEODyS	1548	2011-2090	22	8.43e-08	-3.86	-4.80	0	NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2008/01/31.414 to 2008/02/03.969."
2008 BT18	JPL Sentry	1547	2011-2105	27	1.0e-07	-3.75	-4.59	0	JPL: "Analysis based on 32 observations spanning 3.5553 days (2008-Jan-31.41308 to 2008-Feb-03.96841)." Diameter approximately 0.750 km. from mean, weighted H=18.3.

2008 BD15	JPL Sentry	1547	R E M O V E D						JPL: Risk listing removed at 1131 UTC.

2008 AF4	NEODyS	1548	2078-2090	16	6.81e-06	-2.86	-3.12	0	NEODyS: "Based on 373 optical observations (of which 4 are rejected as outliers) from 2008/01/10.397 to 2008/02/03.953."
2008 AF4	JPL Sentry	1547	2078-2105	38	3.5e-05	-2.18	-2.69	0	JPL: "Analysis based on 369 observations spanning 24.555 days (2008-Jan-10.39652 to 2008-Feb-03.95181)." Diameter approximately 0.380 km. from mean, weighted H=19.8.

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 4 February '08

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

2353	Noted that JPL Sentry has posted 2008 CS1 as an impact risk - see above
2333	Grabbed MPEC 2008-C32 - 2008 CT1 - see above Noted Radar Astrometry database addition - see above
2001	Grabbed MPEC 2008-C29 - 2008 CQ1 - see above Grabbed MPEC 2008-C30 - 2008 CR1 - see above Grabbed MPEC 2008-C31 - 2008 CS1 - see above
1551	Grabbed MPEC 2008-C24 - 2008 CH1 - see above Grabbed MPEC 2008-C26 - 2008 CL1 - see above Grabbed MPEC 2008-C27 - 2008 CM1 - see above Grabbed MPEC 2008-C28 - 2008 CN1 - see above
1548	Noted that NEODyS has updated its 2008 AF4 risk assessment - see above Noted that NEODyS has updated its 2008 BT18 risk assessment - see above Grabbed MPEC 2008-C23 - Daily Orbit Update - see above
1547	Noted that JPL Sentry has updated its 2008 AF4 risk assessment - see above Noted that JPL Sentry has removed 2008 BD15 as an impact risk - see above Noted that JPL Sentry has updated its 2008 BT18 risk assessment - see above Noted that JPL Sentry has removed 2008 CK as an impact risk - see above Grabbed MPEC 2008-C25 - 2008 CJ1 - see above
0129	Grabbed MPEC 2008-C22 - Observations of Comets - see above
0054	Grabbed MPEC 2008-C20 - Comet P/2008 A2 (LINEAR) - see above Grabbed MPEC 2008-C21 - Comet C/2008 C1 (Chen-Gao) - see above
0022	Grabbed MPEC 2008-C18 - Comet C/2007 Y1 (LINEAR) - see above Grabbed MPEC 2008-C19 - Comet C/2008 A1 (McNaught) - see above

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