2008-03-17 Tracking News

Contents on 17 March '08

IAU Minor Planet Center
- NEOCP Activity -- five listings: 2 new, 3 updated
- New MPECs -- five MPECs
Observers -- 47 observing facilities
Impact Risk Monitoring -- four 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.

NEOCP Activity on 17 March '08

The MPC's NEO Confirmation Page has 5 listings: 2 new, 3 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had two new and three updated listings. All of these were "one nighters." So far The Tracking News has counted a total of seven 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 17 March '08

Minor Planet Electronic Circulars

As of last check at 2354 UTC, there have been five MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-F02 time-stamped "01:39 UT" - Comet C/2008 A1 (McNaught) - see below
MPEC 2008-F03 time-stamped "01:46 UT" - Comet C/2008 C1 (Chen-Gao) - see below
MPEC 2008-F04 time-stamped "01:56 UT" - Observations of Comets - see below
MPEC 2008-F05 time-stamped "06:10 UT" - Daily Orbit Update - see below
MPEC 2008-F06 time-stamped "17:18 UT" - 2008 ER90

MPEC 2008-F06 - "17:18 UT" - 2008 ER90

K08E90R 2008 ER90 (small asteroid, H=24.2 ~49m) was discovered at 1350 UT on 11 March by David Tholen's team on Mauna Kea, which observed it at March 11.58p2 at R=21.8-22.0, 13.57-58p3 at R=23.0-6, and 14.49p2 at R=22.7-23.7.

<< DOU on 17 Mar. '08 >> MPEC 2008-F05 - "06:10 UT" - Daily Orbit Update

Observations of risk-listed objects
K08E69D 2008 ED69 (i=36.3°, Q=5.071 AU, arc=5 days, H=16.7 ~1.55 km) from the Spacewatch 1.8m telescope (March 16.40-41p3)
K08E69C 2008 EC69 (Q=4.530 AU, arc=5 days, H=17.0 ~1.35 km) from Spacewatch 1.8m (March 16.39-40p3)
K08E07M 2008 EM7 (arc=10 days, H=21.5 ~170m) from Spacewatch 1.8m (March 16.22-23p3)
Observations of other objects
K08D00W 2008 DW (arc=19 days, H=21.5 ~170m) from Spacewatch 1.8m (March 16.36p3)
K08A28T 2008 AT28 (arc=59 days, H=18.5 ~676m) from the SZTE Asteroid Program (SZTE) (Feb. 27.92-94p2)
K07T08G 2007 TG8 (Q=4.306 AU, arc=185 days, H=18.6 ~645m) from Petit Jean Mtn. South Obs. (PJMSO) (March 16.26-27p5)
K07R19X 2007 RX19 (i=40.4°, arc=184 days, H=18.4 ~708m) from PJMSO (March 16.21p5)
K06D62U 2006 DU62 (arc=3 opp, H=18.0 ~851m) from PJMSO (March 16.22-23p6)
K05E70K 2005 EK70 (arc=4 opp, H=17.4 ~1.12 km) from PJMSO (March 11.19p5 & 16.14-15p5)
K05B02E 2005 BE2 (arc=2 opp, H=18.2 ~776m) from PJMSO (March 16.28-29p5)
K02T66D 2002 TD66 (arc=4 opp, H=20.3 ~295m) from PJMSO (March 11.24p1 & 16.25-26p7)
K00DA7P 2000 DP107 (arc=4 opp, H=18.2 ~776m) from PJMSO (March 16.29p5)
H0891 170891 2004 TY16 from PJMSO (March 16.19-20p5)
68359 68359 2001 OZ13 from PJMSO (March 16.15-16p5)
22099 22099 2000 EX106 from PJMSO (March 16.23-24p5)
21088 21088 1992 BL2 from Los Molinos Obs. (March 16.23p4)
04954 4954 Eric (1990 SQ) from PJMSO (March 16.17-18p4)
03288 3288 Seleucus (1982 DV) from PJMSO (March 16.18-19p5)
01685 1685 Toro (1948 OA) from Aljaraque Obs. (March 16.00p1)
01036 1036 Ganymed (1924 TD) from Aljaraque Obs. (March 15.85-89p3)

MPEC 2008-F04 - "01:56 UT" - Observations of Comets

PK08E020 P/2008 E2 from the Catalina Sky Survey (CSS) (March 11.50-51p4), Lumezzane Obs. (March 14.08-09p4), and Moriyama Obs. (March 15.73-74p2)
CK07Y020 C/2007 Y2 (McNaught) from North Ryde Obs. (March 14.41p1, 14.45p1 & 15.50-53p2) and Kambah Obs. (March 16.49-50p2)
CK07W010 C/2007 W1 (Boattini) from Yatsuka Obs. (March 10.59-60p4), Hamamatsu-Yuto Obs. (March 10.61-64p5 & 11.70-73p3), Monte Deva Obs. (March 14.11p5), Kambah Obs. (March 14.56p2 & 16.57p2), Moriyama Obs. (March 15.64p2), Nazaret Obs. (March 16.02-03p3), Los Molinos Obs. (March 16.27-31p5), Rodeno Obs. (March 16.93-94p3), and Carmelita Obs. (March 16.95-96p3)
CK07T050 C/2007 T5 (Gibbs) from Kiev Comet Station (Feb. 26.02-07p3) and Malaga Obs. (March 8.87p1)
CK07T010 C/2007 T1 (McNaught) from North Ryde Obs. (March 13.49-50p2, 14.48-49p2 & 15.43-45p2) and Moriyama Obs. (March 15.44-45p2)
CK07M020 C/2007 M2 (Catalina) from Cantabria Obs. (March 2.10-13p3), CSS (March 10.41-43p4), Yatsuka Obs. (March 10.57-58p3), Hamamatsu-Yuto Obs. (March 11.66-68p3 & 15.66-69p3), Atlante Obs. (March 12.03-04p3), LINEAR (March 13.31-35p5), Rezman Obs. (March 13.97-99p3), Purple Mtn. Obs. XuYi Station (March 14.53-56p3), Moriyama Obs. (March 15.60-61p2), Ametlla del Valles Obs. (March 15.99p3), and Rodeno Obs. (March 16.90-91p3)
CK07D010 C/2007 D1 (LINEAR) from Paus Obs. (March 13.92p1) and Kambah Obs. (March 16.60-61p2)
CK07B020 C/2007 B2 (Skiff) from Cantabria Obs. (March 7.14-18p3 & 14.00-01p3), CSS (March 7.27-31p4), Ageo Obs. (March 7.72-73p3), Yatsuka Obs. (March 10.58-59p3), Moriyama Obs. (March 10.70p2 & 15.62-63p2), CAST Obs. (March 11.90p1), the Mt. Lemmon Survey (MLS) (March 12.36-39p4), Rezman Obs. (March 13.97-00p3), Crni Vrh Obs. (March 14.04-05p4), Monte Deva Obs. (March 14.09-10p5), Ametlla del Valles Obs. (March 15.96-97p3), Kambah Obs. (March 16.63-64p2), Rodeno Obs. (March 16.91-92p3), and Carmelita Obs. (March 16.95p3)
CK06W030 C/2006 W3 (Christensen) from Ageo Obs. (March 8.51-52p2), Szamotuly-Galowo Obs. (March 10.96p3), CAST Obs. (March 11.83p1), Atlante Obs. (March 11.92-94p3), Moriyama Obs. (March 15.47-48p2), and Rodeno Obs. (March 16.81-82p3)
CK06U060 C/2006 U6 (Spacewatch) from Auckland Obs. (Feb. 26.39-41p3 & March 11.38p3)
CK06S050 C/2006 S5 (Hill) from Cantabria Obs. (March 1.00-03p3), Yatsuka Obs. (March 10.53-54p3), Carmelita Obs. (March 10.84-85p3), CAST Obs. (March 11.88p1), and Remanzacco Obs. (March 13.87p1)
CK06Q010 C/2006 Q1 (McNaught) from AAAA Buenos Aires Obs. (Feb. 12.24-25p2, 13.16p1, 13.23p1 & 17.18-21p3), North Ryde Obs. (March 14.51-54p2 & 15.55-58p2), Los Molinos Obs. (March 16.15-22p7), Auckland Obs. (March 16.49p3), and Kambah Obs. (March 16.53p2)
CK06K040 C/2006 K4 (NEAT) from North Ryde Obs. (March 10.53-55p2, 12.52p1, 13.52p1 & 14.57-60p2)
PK05SL6B P/2005 SB216 (LONEOS) from Szamotuly-Galowo Obs. (March 11.11p2), LINEAR (March 11.22-26p4 & 14.15-20p5), Chante-Perdrix Obs. (March 12.88-90p3), and CSS (March 13.29-31p3)
CK03W42T C/2003 WT42 (LINEAR) from Vallemare di Borbona Obs. (March 9.04-06p3) and Chante-Perdrix Obs. (March 14.13-18p3)
CK02V94Q C/2002 VQ94 (LINEAR) from Modra Obs. (March 6.16p2) and Ametlla del Valles Obs. (March 11.10-15p3)
0183P 183P/Korlevic-Juric from CSS (March 10.32-33p4), Szamotuly-Galowo Obs. (March 11.08-09p2), Rezman Obs. (March 13.97-99p3), and Nazaret Obs. (March 15.96-98p3 & 16.91-92p3)
0180P 180P/NEAT from CSS (March 7.44-46p4 & 13.29-32p4), Malaga Obs. (March 8.91p3), Yatsuka Obs. (March 10.56-57p3), Carmelita Obs. (March 10.85-86p3), Szamotuly-Galowo Obs. (March 11.05p1), LINEAR (March 11.27-31p5), Moriyama Obs. (March 11.60-61p2), Rezman Obs. (March 13.97-99p3), Monte Deva Obs. (March 14.05-06p4), Rodeno Obs. (March 16.89-90p3), and Nazaret Obs. (March 16.95p3)
0172P 172P/Yeung from CSS (March 7.43-46p4 & 13.29-31p4) and LINEAR (March 14.17-20p4)
0124P 124P/Mrkos from Ageo Obs. (March 9.64-65p2), Yatsuka Obs. (March 10.54-55p3), Moriyama Obs. (March 10.65-66p2 & 15.55-56p2), Carmelita Obs. (March 10.85p3), Szamotuly-Galowo Obs. (March 11.09p1), Crni Vrh Obs. (March 11.87-89p4), Atlante Obs. (March 11.94-96p3), Rezman Obs. (March 13.97-99p3), and Rodeno Obs. (March 16.88p3)
0110P 110P/Hartley 3 from Ageo Obs. (March 9.59p3), Calarreona Obs. (March 9.89p3), Yatsuka Obs. (March 10.51-52p3), CAST Obs. (March 11.86p1), and Balzaretto Obs. (March 13.82p1)
0093P 93P/Lovas 1 from Calarreona Obs. (March 9.83p3), Vega del Thader Obs. (March 9.83p2), CSS (March 10.17-19p4), Szamotuly-Galowo Obs. (March 10.92p1), CAST Obs. (March 11.82p1), and Rodeno Obs. (March 16.85-86p3)
0074P 74P/Smirnova-Chernykh from Ageo Obs. (March 8.54-55p2) and MLS (March 12.12-14p4)
0070P 70P/Kojima from Cantabria Obs. (March 7.14-18p3 & 14.00-02p3), CSS (March 7.27-31p4), Ageo Obs. (March 7.72-73p3), LINEAR (March 10.45-49p5 & 13.31-35p5), MLS (March 12.36-39p4), and Ametlla del Valles Obs. (March 15.97-98p6)
0065P 65P/Gunn from Lumezzane Obs. (March 2.83-84p4), Ageo Obs. (March 8.68-69p2), Szamotuly-Galowo Obs. (March 10.00-01p2), Chante-Perdrix Obs. (March 12.85-87p3), and CSS (March 13.19-21p4)
0050P 50P/Arend from Calarreona Obs. (March 9.84p2) and LINEAR (March 12.10-15p5)
0046P 46P/Wirtanen from Ageo Obs. (March 8.47p3), Vega del Thader Obs. (March 9.80-81p3), Calarreona Obs. (March 9.82p3), Yatsuka Obs. (March 10.50p4), Moriyama Obs. (March 10.55p2 & 11.53p2), Gualba Obs. (March 10.82p3 & 13.81p3), CAST Obs. (March 11.82p1), Atlante Obs. (March 11.87-89p3), Monte Deva Obs. (March 11.95-96p4 & 15.91-92p5), Cantabria Obs. (March 13.92-97p3), Nazaret Obs. (March 15.83-86p3 & 16.83-84p3), Montana Blanca Obs. (March 15.84-85p3), and Ingenio Obs. (March 15.90-91p2)
0029P 29P/Schwassmann-Wachmann 1 from Calarreona Obs. (March 9.90p3), Yatsuka Obs. (March 10.52-53p3), Moriyama Obs. (March 10.57-58p2), Gualba Obs. (March 10.82p1 & 13.79-81p4), Stammersdorf Obs. (March 10.88-89p3), CAST Obs. (March 11.86p1), Nazaret Obs. (March 11.93p1, 12.85-86p3, 15.87-89p3 & 16.87-88p4), Ametlla del Valles Obs. (March 13.83-91p16), Carmelita Obs. (March 16.84-86p3), Rodeno Obs. (March 16.86-87p3), and Montcabre Obs. (March 16.89p3)
0026P 26P/Grigg-Skjellerup from Ageo Obs. (March 8.82p2), Atlante Obs. (March 9.20-27p3), Kambah Obs. (March 10.67-68p2), and Moriyama Obs. (March 15.83p2)
0022P 22P/Kopff from Lumezzane Obs. (March 2.95-96p4), CSS (March 10.31-33p4), Paus Obs. (March 10.87-89p2), Szamotuly-Galowo Obs. (March 11.02p1), Nazaret Obs. (March 11.89-90p3), and LINEAR (March 12.22-26p5)
0017P 17P/Holmes from El Olivo Obs. (March 7.85-87p3), Calarreona Obs. (March 9.88p3), Stammersdorf Obs. (March 10.84-86p3), Nazaret Obs. (March 10.85-87p3, 11.84-86p3, 12.90-91p3 & 16.85p3), Atlante Obs. (March 11.84-87p3), CAST Obs. (March 11.85p1), LINEAR (March 12.10-14p5), Chante-Perdrix Obs. (March 12.83p1), and Cantabria Obs. (March 13.97p3)
0008P 8P/Tuttle from Kambah Obs. (March 10.46p2 & 16.48p2), Auckland Obs. (March 11.36-37p3), and Los Molinos Obs. (March 16.05-11p8)
0007P 7P/Pons-Winnecke from Lumezzane Obs. (March 3.01-02p4), CSS (March 10.39-40p4), Szamotuly-Galowo Obs. (March 11.04p2), and Montcabre Obs. (March 16.92p3)

MPEC 2008-F03 - "01:46 UT" - Comet C/2008 C1 (Chen-Gao)

CK08C010 C/2008 C1 (Chen-Gao) (i=61.8°, q=1.262 AU, TP=2008 Apr. 16.8517 TT) from Xingming Obs. (March 3.61-62p2, 5.60-63p3 & 13.61-63p4), Kiev Comet Station (March 6.87-91p6), Calarreona Obs. (March 9.88-89p3), Yatsuka Obs. (March 10.49-50p4), Moriyama Obs. (March 10.54p2 & 15.45p2), Stammersdorf Obs. (March 10.78-80p4), Szamotuly-Galowo Obs. (March 10.97p1), CAST Obs. (March 11.83p1), Atlante Obs. (March 11.90-91p3), Nazaret Obs. (March 12.88-89p3), Cantabria Obs. (March 13.94-98p3), Ingenio Obs. (March 15.84-85p2), and Rodeno Obs. (March 16.83p3)

MPEC 2008-F02 - "01:39 UT" - Comet C/2008 A1 (McNaught)

CK08A010 C/2008 A1 (McNaught) (i=82.6°, q=1.073 AU, TP=2008 Sept. 29.13375 TT) from AAAA Buenos Aires Obs. (Feb. 12.18p2, 17.11-16p3, 27.05p1 & 27.09p1), Auckland Obs. (March 11.35p3 & 16.48p3), North Ryde Obs. (March 11.45-47p2, 12.46-48p2, 13.44-47p2, 15.47-48p2 & 16.48-51p2), Moriyama Obs. (March 15.41-42p2), and Kambah Obs. (March 16.52p2)

Observers on 17 March '08

A total of 47 observing facilities appear in today's MPECs.

Code	Observer / observatory
`834`	AAAA Buenos Aires Obs. in Argentina, 2 in MPECs 2008-F02 & 2008-F04 -- C/2008 A1, C/2006 Q1
`349`	Ageo Obs. in Japan, 9 in MPEC 2008-F04 -- C/2007 B2, C/2006 W3, 124P, 110P, 74P, 70P, 65P, 46P, 26P
`J32`	Aljaraque Obs., 2 in MPEC 2008-F05 -- 1685, 1036
`B37`	Ametlla del Valles Obs. in Spain, 5 in MPEC 2008-F04 -- C/2007 M2, C/2007 B2, C/2002 VQ94, 70P, 29P
`J51`	Atlante Obs. in the Canary Islands, 7 in MPECs 2008-F03 & 2008-F04 -- C/2008 C1, C/2007 M2, C/2006 W3, 124P, 46P, 26P, 17P
`467`	Auckland Obs. in New Zealand, 4 in MPECs 2008-F02 & 2008-F04 -- C/2008 A1, C/2006 U6, C/2006 Q1, 8P
`A81`	Balzaretto Obs. in Italy, 1 in MPEC 2008-F04 -- 110P
`235`	CAST Obs. in Italy, 9 in MPECs 2008-F03 & 2008-F04 -- C/2008 C1, C/2007 B2, C/2006 W3, C/2006 S5, 110P, 93P, 46P, 29P, 17P
`J79`	Calarreona Obs. in Spain, 7 in MPECs 2008-F03 & 2008-F04 -- C/2008 C1, 110P, 93P, 50P, 46P, 29P, 17P
`J96`	Cantabria Obs. in Spain, 7 in MPECs 2008-F03 & 2008-F04 -- C/2008 C1, C/2007 M2, C/2007 B2, C/2006 S5, 70P, 46P, 17P
`B20`	Carmelita Obs. in Spain, 6 in MPEC 2008-F04 -- C/2007 W1, C/2007 B2, C/2006 S5, 180P, 124P, 29P
`703`	Catalina Sky Survey (CSS) in Arizona, 12 in MPEC 2008-F04 -- P/2008 E2, C/2007 M2, C/2007 B2, P/2005 SB216, 183P, 180P, 172P, 93P, 70P, 65P, 22P, 7P
`A77`	Chante-Perdrix Obs. in France, 4 in MPEC 2008-F04 -- P/2005 SB216, C/2003 WT42, 65P, 17P
`106`	Crni Vrh Obs. in Slovenia, 2 in MPEC 2008-F04 -- C/2007 B2, 124P
`J36`	El Olivo Obs. in Spain, 1 in MPEC 2008-F04 -- 17P
`442`	Gualba Obs. in Spain, 2 in MPEC 2008-F04 -- 46P, 29P
`379`	Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2008-F04 -- C/2007 W1, C/2007 M2
`J39`	Ingenio Obs. in the Canary Islands, 2 in MPECs 2008-F03 & 2008-F04 -- C/2008 C1, 46P
`415`	Kambah Obs. in the Australian Capital Territory, 8 in MPECs 2008-F02 & 2008-F04 -- C/2008 A1, C/2007 Y2, C/2007 W1, C/2007 D1, C/2007 B2, C/2006 Q1, 26P, 8P
`585`	Kiev Comet Station in the Ukraine, 2 in MPECs 2008-F03 & 2008-F04 -- C/2008 C1, C/2007 T5
`704`	LINEAR in New Mexico, 8 in MPEC 2008-F04 -- C/2007 M2, P/2005 SB216, 180P, 172P, 70P, 50P, 22P, 17P
`844`	Los Molinos Obs. in Uruguay, 4 in MPECs 2008-F04 & 2008-F05 -- C/2007 W1, C/2006 Q1, 21088, 8P
`130`	Lumezzane Obs. in Italy, 4 in MPEC 2008-F04 -- P/2008 E2, 65P, 22P, 7P
`J40`	Malaga Obs. in Spain, 2 in MPEC 2008-F04 -- C/2007 T5, 180P
`5682`	David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2008-F06 -- 2008 ER90
`118`	Modra Obs. in Slovakia, 1 in MPEC 2008-F04 -- C/2002 VQ94
`J46`	Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2008-F04 -- 46P
`213`	Montcabre Obs. in Spain, 2 in MPEC 2008-F04 -- 29P, 7P
`945`	Monte Deva Obs. in Spain, 4 in MPEC 2008-F04 -- C/2007 W1, C/2007 B2, 180P, 46P
`900`	Moriyama Obs. in Japan, 13 in MPECs 2008-F02, 2008-F03 & 2008-F04 -- P/2008 E2, C/2008 C1, C/2008 A1, C/2007 W1, C/2007 T1, C/2007 M2, C/2007 B2, C/2006 W3, 180P, 124P, 46P, 29P, 26P
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 3 in MPEC 2008-F04 -- C/2007 B2, 74P, 70P
`J47`	Nazaret Obs. in Spain, 8 in MPECs 2008-F03 & 2008-F04 -- C/2008 C1, C/2007 W1, 183P, 180P, 46P, 29P, 22P, 17P
`423`	North Ryde Obs. in New South Wales, 5 in MPECs 2008-F02 & 2008-F04 -- C/2008 A1, C/2007 Y2, C/2007 T1, C/2006 Q1, C/2006 K4
`B49`	Paus Obs. in Spain, 2 in MPEC 2008-F04 -- C/2007 D1, 22P
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 12 in MPEC 2008-F05 -- 2007 TG8, 2007 RX19, 2006 DU62, 2005 EK70, 2005 BE2, 2002 TD66, 2000 DP107, 68359, 22099, 170891, 4954, 3288
`D29`	Purple Mtn. Obs. XuYi Station in China, 1 in MPEC 2008-F04 -- C/2007 M2
`473`	Remanzacco Obs. in Italy, 1 in MPEC 2008-F04 -- C/2006 S5
`A41`	Rezman Obs. in Slovenia, 5 in MPEC 2008-F04 -- C/2007 M2, C/2007 B2, 183P, 180P, 124P
`939`	Rodeno Obs. in Spain, 9 in MPECs 2008-F03 & 2008-F04 -- C/2008 C1, C/2007 W1, C/2007 M2, C/2007 B2, C/2006 W3, 180P, 124P, 93P, 29P
`461`	SZTE Asteroid Program in Hungary, 1 in MPEC 2008-F05 -- 2008 AT28
`291`	Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2008-F05 -- 2008 EM7, 2008 ED69, 2008 EC69, 2008 DW
`A97`	Stammersdorf Obs. in Austria, 3 in MPECs 2008-F03 & 2008-F04 -- C/2008 C1, 29P, 17P
`B30`	Szamotuly-Galowo Obs. in Poland, 10 in MPECs 2008-F03 & 2008-F04 -- C/2008 C1, C/2006 W3, P/2005 SB216, 183P, 180P, 124P, 93P, 65P, 22P, 7P
`A55`	Vallemare di Borbona Obs. in Italy, 1 in MPEC 2008-F04 -- C/2003 WT42
`J70`	Vega del Thader Obs. in Spain, 2 in MPEC 2008-F04 -- 93P, 46P
`C42`	Xingming Obs. in China, 1 in MPEC 2008-F03 -- C/2008 C1
`367`	Yatsuka Obs., 10 in MPECs 2008-F03 & 2008-F04 -- C/2008 C1, C/2007 W1, C/2007 M2, C/2007 B2, C/2006 S5, 180P, 124P, 110P, 46P, 29P

Impact Risk Monitoring on 17 March '08

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2354 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 ED69	NEODyS	1429	2053	1	2.16e-11	-6.21	-6.21	0	NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2008/03/11.497 to 2008/03/16.414."

2008 EC69	JPL Sentry	1429	2018-2104	118	2.4e-07	-2.61	-3.45	0	JPL: "Analysis based on 37 observations spanning 4.9009 days (2008-Mar-11.49608 to 2008-Mar-16.39694)." Diameter approximately 1.264 km. from mean, weighted H=17.1.
2008 EC69	NEODyS	1429	2018-2090	117	2.32e-07	-2.61	-3.44	0	NEODyS: "Based on 37 optical observations (of which 0 are rejected as outliers) from 2008/03/11.497 to 2008/03/16.398."

2008 EM7	JPL Sentry	1429	R E M O V E D						JPL: Risk listing removed at 1007 UTC.

2008 AF4	JPL Sentry	1639	2078-2100	8	5.3e-05	-1.94	-2.02	1	JPL: "Analysis based on 584 observations spanning 64.725 days (2008-Jan-10.39652 to 2008-Mar-15.1213)." Diameter approximately 0.390 km. from mean, weighted H=19.7.

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 17 March '08

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

1740	Grabbed MPEC 2008-F06 - 2008 ER90 - see above
1639	Noted that JPL Sentry has updated its 2008 AF4 risk assessment - see above
1429	Noted that JPL Sentry has updated its 2008 EC69 risk assessment - see above Noted that NEODyS has updated its 2008 EC69 risk assessment - see above Noted that NEODyS has updated its 2008 ED69 risk assessment - see above Noted that JPL Sentry has removed 2008 EM7 as an impact risk - see above Grabbed MPEC 2008-F05 - Daily Orbit Update - see above
0231	Grabbed MPEC 2008-F02 - Comet C/2008 A1 (McNaught) - see above Grabbed MPEC 2008-F03 - Comet C/2008 C1 (Chen-Gao) - see above Grabbed MPEC 2008-F04 - Observations of Comets - see above

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