2009-03-21 Tracking News

Contents on 21 March '09

Radar Astrometry -- one object
IAU Minor Planet Center
- NEOCP Activity -- six listings: 6 updated
- New MPECs -- seven MPECs
Observers -- 35 observing facilities
Impact Risk Monitoring -- thirteen 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 21 March '09

Radar observation of one object

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

Data update noted at 0556 UTC when the database was dated 20 March

2009 DO111 from Goldstone DSS-14 70m antenna transmit with Goldstone DSS-13 34m antenna receive (March 21.03 velocity) - see links

NEOCP Activity on 21 March '09

The MPC's NEO Confirmation Page has 6 listings: 6 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had six updated listings. Of these, four were "one nighters." So far The Tracking News has counted a total of eighteen listings on the NEOCP at some point today.

New MPECs on 21 March '09

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been seven MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2009-F52 time-stamped "01:36 UT" - 1999 EF5 - see below
MPEC 2009-F53 time-stamped "06:11 UT" - Daily Orbit Update - see below
MPEC 2009-F54 time-stamped "15:43 UT" - Comet C/2009 F4 (McNaught) - see below
MPEC 2009-F55 time-stamped "18:30 UT" - 2009 EC - see below
MPEC 2009-F56 time-stamped "21:39 UT" - 2009 FX10 - see below
MPEC 2009-F57 time-stamped "21:42 UT" - 2009 FY10 - see below
MPEC 2009-F58 time-stamped "21:45 UT" - 2009 FZ10

MPEC 2009-F58 - "21:45 UT" - 2009 FZ10

K09F10Z 2009 FZ10 (risk-listed, Earth MOID=3.6 LD, H=25.4 ~28m) was discovered at 0747 UT on 21 March by the Catalina Sky Survey (CSS), which observed it at March 21.32-35p4 and 21.43p4. The discovery was confirmed by Sabino Canyon Obs. (March 21.41-42p3), Dave Balam via Plaskett 1.8m Telescope (March 21.41p3), Mt. John Obs. (March 21.53-54p4), Naef Obs. (March 21.86-87p4), and Calar Alto Obs. (March 21.88-89p3).

MPEC 2009-F57 - "21:42 UT" - 2009 FY10

K09F10Y 2009 FY10 (risk-listed, H=20.1 ~323m) was discovered at 0520 UT on 21 March by the Mt. Lemmon Survey (MLS), which observed it at March 21.22-27p7 at V=20.7-22.1 and 21.37p4 at V=20.4-21.1. The discovery was confirmed by Calar Alto Obs. (March 21.82-83p3).

MPEC 2009-F56 - "21:39 UT" - 2009 FX10

K09F10X 2009 FX10 (small asteroid, Earth MOID=9.2 LD, H=24.4 ~45m) was discovered at 0511 UT on 21 March by CSS, which observed it at March 21.22-27p7. The discovery was confirmed by Sabino Canyon Obs. (March 21.28-29p3), Calar Alto Obs. (March 21.82p3), Starkenburg Obs. (March 21.82-83p3), and Guidestar Obs. (March 21.83-85p3).

MPEC 2009-F55 - "18:30 UT" - 2009 EC

K09E00C 2009 EC (i=37.6°, H=18.4 ~708m) from CSS (March 21.44-45p3 & 21.50p4) and Balam/Plaskett (March 21.49p3)

MPEC 2009-F54 - "15:43 UT" - Comet C/2009 F4 (McNaught)

CK09F040 C/2009 F4 (McNaught) (i=80.1°, q=5.806 AU, TP=2012 Jan. 10.967 TT) from the Siding Spring Survey (SSS) (March 19.68-71p4, 20.59-60p2, 20.75p2 & 20.81p1), RAS Obs. Mayhill (March 20.36-41p3), Astronomical Research Obs. (ARO) (March 20.41-42p3), Table Mtn. Obs. (March 20.45-50p4), Moana Obs. (March 20.57-58p3), El Leoncito Obs. (March 21.28-32p5), and Sabino Canyon Obs. (March 21.38-40p3)

<< DOU on 21 Mar. '09 >> MPEC 2009-F53 - "06:11 UT" - Daily Orbit Update

Observations of risk-listed objects
K09F01G 2009 FG1 (i=68.8°, arc=4 days, H=18.4 ~708m) from Guidestar Obs. (March 20.99-00p3)
K09F00S 2009 FS (small asteroid, arc=3 days, H=24.2 ~49m) from ARO (March 20.12p3)
K09F00P 2009 FP (small asteroid, arc=3 days, H=23.0 ~85m) from the Spacewatch 1.8m telescope (March 20.30p3)
K09F00J 2009 FJ (small asteroid, arc=4 days, H=24.9 ~35m) from Hamamatsu-Yuto Obs. (March 18.60-61p3), Lumezzane Obs. (March 19.03p4), Petit Jean Mtn. South Obs. (PJMSO) (March 20.33p9), and Sormano Obs. (March 20.89-90p4)
K09F00E 2009 FE (Q=4.077 AU, arc=5 days, H=21.4 ~178m) from ARO (March 20.32-33p3) and Sormano Obs. (March 20.99p3)
K09DB1O 2009 DO111 (small asteroid, arc=26 days, H=23.0 ~85m) from ARO (March 20.08p18)
Observations of recently (no longer) risk-listed objects
K09D39H 2009 DH39 (i=53.7°, arc=23 days, H=18.7 ~616m) from Sormano Obs. (March 20.79-80p4)
K09D03R 2009 DR3 (arc=29 days, H=21.5 ~170m) from Schiaparelli Obs. (March 13.88p5)
K09D01M 2009 DM1 (Q=4.748 AU, arc=2 opp, H=17.1 ~1.29 km) from ARO (March 20.04-05p3)
K09D01F 2009 DF1 (arc=29 days, H=20.6 ~257m) from PJMSO (March 20.41-42p6)
K09C05Q 2009 CQ5 (arc=35 days, H=17.7 ~977m) from Sormano Obs. (March 20.81p2)
Observations of small asteroids (H>22.0)
K09F04X 2009 FX4 (arc=2 days, H=25.3 ~29m) from Sormano Obs. (March 20.96-97p2) and Great Shefford Obs. (March 21.09p3)
K09F04W 2009 FW4 (arc=1 day, H=24.6 ~41m) from Moriyama Obs. (March 20.59-60p2)
K09F01J 2009 FJ1 (arc=2 days, H=23.0 ~85m) from ARO (March 20.31-32p3)
K09F00R 2009 FR (arc=3 days, H=26.5 ~17m) from ARO (March 20.30-31p3)
K09F00L 2009 FL (arc=3 days, H=24.4 ~45m) from ARO (March 20.16p3)
K09F00D 2009 FD (arc=25 days, H=22.1 ~129m) from La Sagra Obs. (March 19.12-14p3), PJMSO (March 20.35-37p7), Sormano Obs. (March 20.87-88p3), Guidestar Obs. (March 21.01-02p3), and Great Shefford Obs. (March 21.03-04p4)
K09E01G 2009 EG1 (arc=17 days, H=23.6 ~65m) from Schiaparelli Obs. (March 16.90-91p5) and ARO (March 17.17-18p3, 18.10-11p5 & 20.14-15p4)
K09E01C 2009 EC1 (arc=17 days, H=22.8 ~93m) from Schiaparelli Obs. (March 17.08-09p5)
K09D10T 2009 DT10 (arc=26 days, H=22.9 ~89m) from ARO (March 20.14-16p3 at V=22.0-22.6)
K09C01U 2009 CU1 (arc=44 days, H=22.5 ~107m) from the Spacewatch 0.9m telescope (March 19.12-15p3)
Observations of other objects
K09F04Y 2009 FY4 (arc=2 days, H=21.0 ~214m) from Sormano Obs. (March 20.85p3), Wildberg Obs. (March 21.06-09p5), and Great Shefford Obs. (March 21.10-11p3)
K09F00T 2009 FT (arc=3 days, H=18.9 ~562m) from Guidestar Obs. (March 20.93-95p3)
K09F00A 2009 FA (i=42.4°, Q=4.099 AU, arc=4 days, H=18.6 ~645m) from Schiaparelli Obs. (March 17.10-11p5), Hamamatsu-Yuto Obs. (March 17.65-66p4, 18.63-67p4 & 20.62-65p4), PJMSO (March 20.32-33p8), Starkenburg Obs. (March 20.81p3), and Sormano Obs. (March 20.86-87p3)
K09E03F 2009 EF3 (arc=3 days, H=21.5 ~170m) from La Sagra Obs. (March 17.97-00p3)
K09E02Q 2009 EQ2 (arc=12 days, H=20.6 ~257m) from Spacewatch 0.9m (March 19.32-36p3)
K09E02P 2009 EP2 (arc=15 days, H=21.6 ~162m) from Schiaparelli Obs. (March 13.89p4), Hamamatsu-Yuto Obs. (March 17.49-51p5, 18.59p3 & 20.50-53p3), Moriyama Obs. (March 18.58p2), Lumezzane Obs. (March 19.02p4), and PJMSO (March 20.26-27p10)
K09E01D 2009 ED1 (arc=18 days, H=19.7 ~389m) from ARO (March 20.42-43p3)
K09D01N 2009 DN1 (arc=29 days, H=20.3 ~295m) from ARO (March 20.10-11p3)
K09D00Z 2009 DZ (arc=31 days, H=21.4 ~178m) from ARO (March 20.17-18p3), Guidestar Obs. (March 20.81-83p3), and Sormano Obs. (March 20.83-84p3)
K09C05P 2009 CP5 (arc=34 days, H=21.4 ~178m) from ARO (March 20.06-07p3)
K09C05O 2009 CO5 (arc=46 days, H=21.7 ~155m) from PJMSO (March 20.29-30p6)
K09C02Z 2009 CZ2 (Q=4.074 AU, arc=44 days, H=19.0 ~537m) from Lumezzane Obs. (March 18.96-97p4) and ARO (March 20.13p3)
K09B02M 2009 BM2 (Q=4.279 AU, arc=62 days, H=19.9 ~355m) from Bergen-Enkheim Obs. (March 20.85-89p4)
K09B02L 2009 BL2 (arc=61 days, H=19.3 ~467m) from ARO (March 20.09-10p3)
K08Y29E 2008 YE29 (Q=4.545 AU, arc=80 days, H=20.5 ~269m) from PJMSO (March 20.30-31p5)
K08Y02R 2008 YR2 (arc=86 days, H=18.9 ~562m) from SSS (March 17.64-67p4)
K08W60L 2008 WL60 (arc=117 days, H=18.0 ~851m) from Hamamatsu-Yuto Obs. (March 18.82-84p5 & 20.80-81p3) and Doc Greiner Research Obs. (DGRO) (March 20.27-30p29)
K08W14C 2008 WC14 (Q=5.328 AU, arc=120 days, H=20.0 ~339m) from ARO (March 20.17-19p3 at V=22.1-4)
K08U91V 2008 UV91 (arc=142 days, H=20.0 ~339m) from CSS (March 19.28-30p4)
K08Q11S 2008 QS11 (arc=204 days, H=19.9 ~355m) from ARO (March 20.09-12p3 at V=22.1-2)
K08O09B 2008 OB9 (Q=5.653 AU, arc=2 opp, H=17.5 ~1.07 km) from Lumezzane Obs. (March 18.83p2)
K08E05Y 2008 EY5 (q=0.234 AU, arc=2 opp, H=20.1 ~323m) from Schiaparelli Obs. (March 16.85p1)
K07B02T 2007 BT2 (arc=3 opp, H=17.3 ~1.17 km) from Hamamatsu-Yuto Obs. (March 18.78-81p7 & 20.76-78p6) and PJMSO (March 20.39-40p5)
K06B10C 2006 BC10 (arc=3 opp, H=19.5 ~426m) from Hamamatsu-Yuto Obs. (March 17.55-58p4 & 18.47-48p3) and Lumezzane Obs. (March 18.86-87p4)
K05S19G 2005 SG19 (Q=4.171 AU, arc=2 opp, H=16.7 ~1.55 km) from LINEAR (March 20.33-37p5)
K04E09U 2004 EU9 (arc=3 opp, H=18.9 ~562m) from Schiaparelli Obs. (March 13.91-92p2 & 13.98-99p2) and Lumezzane Obs. (March 19.04-05p4)
K02E02Z 2002 EZ2 (arc=3 opp, H=20.1 ~323m) from La Sagra Obs. (March 18.92-95p3)
K01C32K 2001 CK32 (arc=2 opp, H=18.9 ~562m) from Lumezzane Obs. (March 18.81p3)
K8565 208565 2002 CT11 from CSS (March 18.27-29p4)
K7970 207970 1996 BZ3 from La Sagra Obs. (March 16.99-01p3)
K6910 206910 2004 NL8 from La Sagra Obs. (March 15.02-04p3) and Lumezzane Obs. (March 19.05-06p4)
K3217 203217 2001 FX9 from CSS (March 17.17-18p4) and LINEAR (March 20.21-25p5)
G4400 164400 2005 GN59 from Boambee Obs. (March 16.45-46p2)
G2900 162900 2001 HG31 from CSS (March 19.11-13p4)
G2080 162080 1998 DG16 from La Sagra Obs. (March 14.85-87p3)
F5334 155334 2006 DZ169 from La Sagra Obs. (March 20.08-11p3) and LINEAR (March 20.32-37p4)
D8883 138883 2000 YL29 from CSS (March 19.46-48p3)
99935 99935 2002 AV4 from La Sagra Obs. (March 15.94-96p3 & 16.91-93p3)
38086 38086 Beowulf (1999 JB) from CSS (March 18.36-40p4)
35396 35396 1997 XF11 from La Sagra Obs. (March 19.93-95p3)
35107 35107 1991 VH from Deep Sky Obs. (March 17.82-86p3)
25916 25916 2001 CP44 from CSS (March 18.24-26p4)
22771 22771 1999 CU3 from CSS (March 17.17-18p4) and LINEAR (March 20.21-25p5)
20460 20460 Robwhiteley (1999 LO28) from CSS (March 18.10-12p4)
10302 10302 1989 ML from CSS (March 17.29-31p4)
08566 8566 1996 EN from CSS (March 17.35-40p8)
07977 7977 1977 QQ5 from CSS (March 19.43-45p4)
07480 7480 Norwan (1994 PC) from CSS (March 17.21-23p4)
07088 7088 Ishtar (1992 AA) from CSS (March 19.46-49p4)
05693 5693 1993 EA from CSS (March 19.46-49p4)
05620 5620 Jasonwheeler (1990 OA) from CSS (March 19.46-49p4)
04179 4179 Toutatis (1989 AC) from Deep Sky Obs. (March 19.85-88p7) and LINEAR (March 20.20-25p5)
03271 3271 Ul (1982 RB) from CSS (March 18.36-40p4)
03199 3199 Nefertiti (1982 RA) from Boambee Obs. (March 16.44-45p2) and CSS (March 19.25-26p4)
03122 3122 Florence (1981 ET3) from La Sagra Obs. (March 14.94-96p3)
03103 3103 Eger (1982 BB) from La Sagra Obs. (March 15.06-08p3)
03102 3102 Krok (1981 QA) from CSS (March 17.41-42p4) and La Sagra Obs. (March 18.09-11p3)
02329 2329 Orthos (1976 WA) from La Sagra Obs. (March 14.89-91p3)
01863 1863 Antinous (1948 EA) from CSS (March 19.11-13p4)
01036 1036 Ganymed (1924 TD) from Boambee Obs. (March 16.45-47p3)

MPEC 2009-F52 - "01:36 UT" - 1999 EF5

J99E05F 1999 EF5 (H=19.5 ~426m) from LINEAR (March 20.33-37p4), Guidestar Obs. (March 20.96-97p3), CAST Obs. (March 20.00p2), Great Shefford Obs. (March 21.00-01p3), Starkenburg Obs. (March 21.00-01p4), and Farra d'Isonzo Obs. (March 21.01-02p2)

Observers on 21 March '09

A total of 35 observing facilities appear in today's MPECs.

Code	Observer / observatory
`H55`	Astronomical Research Obs. (ARO) in Illinois, 18 in MPECs 2009-F53 & 2009-F54 -- 2009 FS, 2009 FR, 2009 FL, 2009 FJ1, 2009 FE, C/2009 F4, 2009 EG1, 2009 ED1, 2009 DZ, 2009 DT10, 2009 DO111, 2009 DN1, 2009 DM1, 2009 CZ2, 2009 CP5, 2009 BL2, 2008 WC14, 2008 QS11
`A74`	Bergen-Enkheim Obs. in Germany, 1 in MPEC 2009-F53 -- 2009 BM2
`432`	Boambee Obs. in New South Wales, 3 in MPEC 2009-F53 -- 164400, 3199, 1036
`235`	CAST Obs. in Italy, 1 in MPEC 2009-F52 -- 1999 EF5
`493`	Calar Alto Obs. in Spain, 3 in MPECs 2009-F56, 2009-F57 & 2009-F58 -- 2009 FZ10, 2009 FY10, 2009 FX10
`703`	Catalina Sky Survey (CSS) in Arizona, 23 in MPECs 2009-F53, 2009-F55, 2009-F56 & 2009-F58 -- 2009 FZ10, 2009 FX10, 2009 EC, 2008 UV91, 38086, 25916, 22771, 208565, 20460, 203217, 162900, 138883, 10302, 8566, 7977, 7480, 7088, 5693, 5620, 3271, 3199, 3102, 1863
`B60`	Deep Sky Obs. in Germany, 2 in MPEC 2009-F53 -- 35107, 4179
`H26`	Doc Greiner Research Obs. in Wisconsin, 1 in MPEC 2009-F53 -- 2008 WL60
`808`	El Leoncito Obs. in Argentina, 1 in MPEC 2009-F54 -- C/2009 F4
`595`	Farra d'Isonzo Obs. in Italy, 1 in MPEC 2009-F52 -- 1999 EF5
`252`	Goldstone DSS-13 34m antenna in southern California, 1 in radar -- 2009 DO111
`253`	Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2009 DO111
`J95`	Great Shefford Obs. in England, 4 in MPECs 2009-F52 & 2009-F53 -- 2009 FY4, 2009 FX4, 2009 FD, 1999 EF5
`A17`	Guidestar Obs. in Germany, 6 in MPECs 2009-F52, 2009-F53 & 2009-F56 -- 2009 FX10, 2009 FT, 2009 FG1, 2009 FD, 2009 DZ, 1999 EF5
`379`	Hamamatsu-Yuto Obs. in Japan, 6 in MPEC 2009-F53 -- 2009 FJ, 2009 FA, 2009 EP2, 2008 WL60, 2007 BT2, 2006 BC10
`704`	LINEAR in New Mexico, 6 in MPECs 2009-F52 & 2009-F53 -- 2005 SG19, 1999 EF5, 22771, 203217, 155334, 4179
`J75`	La Sagra Obs. in Spain, 13 in MPEC 2009-F53 -- 2009 FD, 2009 EF3, 2002 EZ2, 99935, 35396, 207970, 206910, 162080, 155334, 3122, 3103, 3102, 2329
`130`	Lumezzane Obs. in Italy, 8 in MPEC 2009-F53 -- 2009 FJ, 2009 EP2, 2009 CZ2, 2008 OB9, 2006 BC10, 2004 EU9, 2001 CK32, 206910
`F86`	Moana Obs. in Tahiti, 1 in MPEC 2009-F54 -- C/2009 F4
`900`	Moriyama Obs. in Japan, 2 in MPEC 2009-F53 -- 2009 FW4, 2009 EP2
`474`	Mt. John Obs. in New Zealand, 1 in MPEC 2009-F58 -- 2009 FZ10
`G96`	Mt. Lemmon Survey in Arizona, 1 in MPEC 2009-F57 -- 2009 FY10
`A13`	Naef Obs. in Switzerland, 1 in MPEC 2009-F58 -- 2009 FZ10
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 8 in MPEC 2009-F53 -- 2009 FJ, 2009 FD, 2009 FA, 2009 EP2, 2009 DF1, 2009 CO5, 2008 YE29, 2007 BT2
`6581`	Dave Balam via Plaskett 1.8m Telescope in British Columbia, 2 in MPECs 2009-F55 & 2009-F58 -- 2009 FZ10, 2009 EC
`H06`	RAS Obs. Mayhill in New Mexico, 1 in MPEC 2009-F54 -- C/2009 F4
`854`	Sabino Canyon Obs. in Arizona, 3 in MPECs 2009-F54, 2009-F56 & 2009-F58 -- 2009 FZ10, 2009 FX10, C/2009 F4
`204`	Schiaparelli Obs. in Italy, 7 in MPEC 2009-F53 -- 2009 FA, 2009 EP2, 2009 EG1, 2009 EC1, 2009 DR3, 2008 EY5, 2004 EU9
`E12`	Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2009-F53 & 2009-F54 -- C/2009 F4, 2008 YR2
`587`	Sormano Obs. in Italy, 9 in MPEC 2009-F53 -- 2009 FY4, 2009 FX4, 2009 FJ, 2009 FE, 2009 FD, 2009 FA, 2009 DZ, 2009 DH39, 2009 CQ5
`691`	Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2009-F53 -- 2009 EQ2, 2009 CU1
`291`	Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2009-F53 -- 2009 FP
`611`	Starkenburg Obs. in Germany, 3 in MPECs 2009-F52, 2009-F53 & 2009-F56 -- 2009 FX10, 2009 FA, 1999 EF5
`673`	Table Mtn. Obs. in southern California, 1 in MPEC 2009-F54 -- C/2009 F4
`198`	Wildberg Obs. in Germany, 1 in MPEC 2009-F53 -- 2009 FY4

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

Impact Risk Monitoring on 21 March '09

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2359 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.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Beginning Jan. 22nd, both are also posting impact solutions beyond 100 years for a few objects.
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

2009 FZ10	JPL Sentry	2359	2082-2108	9	6.3e-08	-7.64	-7.92	0	JPL: "Analysis based on 25 observations spanning .56151 days (2009-Mar-21.32461 to 2009-Mar-21.886117)." Diameter approximately 0.027 km. from mean, weighted H=25.5.

2009 FY10	JPL Sentry	2359	2012-2055	7	1.6e-09	-5.23	-5.28	0	JPL: "Analysis based on 14 observations spanning .60597 days (2009-Mar-21.22287 to 2009-Mar-21.828839)." Diameter approximately 0.310 km. from mean, weighted H=20.2.

2009 FZ4	NEODyS	1557	2014-2088	81	3.27e-07	-6.31	-6.89	0	NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2009/03/19.371 to 2009/03/19.970."
2009 FZ4	JPL Sentry	0425	2013-2108	442	2.4e-06	-5.44	-6.34	0	JPL: "Analysis based on 11 observations spanning .59999 days (2009-Mar-19.36974 to 2009-Mar-19.96973)." Diameter approximately 0.031 km. from mean, weighted H=25.2.

2009 FV4	NEODyS	1557	2013-2090	44	1.35e-09	-4.29	-4.58	0	NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2009/03/19.283 to 2009/03/20.246."
2009 FV4	JPL Sentry	0425	2016	1	1.7e-10	-4.94	-4.94	0	JPL: "Analysis based on 14 observations spanning .96322 days (2009-Mar-19.28213 to 2009-Mar-20.245353)." Diameter approximately 0.880 km. from mean, weighted H=17.9.

2009 FU4	NEODyS	1557	2045	1	5.89e-10	-5.00	-5.00	0	NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2009/03/19.275 to 2009/03/20.376."
2009 FU4	JPL Sentry	0425	2090	1	8.3e-10	-5.54	-5.54	0	JPL: "Analysis based on 21 observations spanning 1.1004 days (2009-Mar-19.2744 to 2009-Mar-20.37477)." Diameter approximately 1.100 km. from mean, weighted H=17.5.

2009 FS4	JPL Sentry	0425	2079	1	2.8e-10	-9.80	-9.80	0	JPL: "Analysis based on 18 observations spanning .93618 days (2009-Mar-18.94834 to 2009-Mar-19.88452)." Diameter approximately 0.030 km. from mean, weighted H=25.3.

2009 FG1	NEODyS	1557	2038-2081	6	3.53e-08	-3.42	-3.57	0	NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2009/03/17.305 to 2009/03/21.000."
2009 FG1	JPL Sentry	1556	2038-2061	3	3.0e-08	-3.48	-3.63	0	JPL #2 for the day: "Analysis based on 31 observations spanning 3.6951 days (2009-Mar-17.30415 to 2009-Mar-20.99926)." Diameter approximately 0.790 km. from mean, weighted H=18.2.

2009 FS	NEODyS	1557	2090	1	2.86e-09	-8.37	-8.37	0	NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2009/03/17.257 to 2009/03/20.122."
2009 FS	JPL Sentry	1556	2090	1	2.7e-09	-8.33	-8.33	0	JPL: "Analysis based on 33 observations spanning 2.8652 days (2009-Mar-17.25582 to 2009-Mar-20.121002)." Diameter approximately 0.049 km. from mean, weighted H=24.2.

2009 FP	JPL Sentry	1556	2095	1	5.9e-10	-8.41	-8.41	0	JPL #2 for the day: "Analysis based on 28 observations spanning 3.0346 days (2009-Mar-17.26958 to 2009-Mar-20.30417)." Diameter approximately 0.090 km. from mean, weighted H=22.9.

2009 FJ	NEODyS	1557	2058-2088	6	6.08e-05	-4.26	-4.28	0	NEODyS: "Based on 91 optical observations (of which 7 are rejected as outliers) from 2009/03/17.245 to 2009/03/20.903."
2009 FJ	JPL Sentry	1556	2058-2107	11	6.4e-05	-4.25	-4.28	0	JPL #2 for the day: "Analysis based on 84 observations spanning 3.5935 days (2009-Mar-17.30916 to 2009-Mar-20.90262)." Diameter approximately 0.035 km. from mean, weighted H=24.9.

2009 FG	JPL Sentry	0425	2022-2106	30	7.4e-06	-5.53	-6.32	0	JPL: "Analysis based on 45 observations spanning 2.9484 days (2009-Mar-16.3986 to 2009-Mar-19.34695)." Diameter approximately 0.027 km. from mean, weighted H=25.5.

2009 FE	NEODyS	1557	2044	1	5.68e-06	-3.44	-3.44	0	NEODyS: "Based on 42 optical observations (of which 0 are rejected as outliers) from 2009/03/16.280 to 2009/03/20.991."
2009 FE	JPL Sentry	1556	2044-2103	4	6.0e-06	-3.42	-3.43	0	JPL #2 for the day: "Analysis based on 42 observations spanning 4.7113 days (2009-Mar-16.27919 to 2009-Mar-20.99046)." Diameter approximately 0.180 km. from mean, weighted H=21.4.

2009 DO111	JPL Sentry	0705	R E M O V E D						JPL #2 for the day: Risk listing removed at 0657 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 21 March '09

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

2359	Noted that JPL Sentry has posted 2009 FY10 as an impact risk - see above Noted that JPL Sentry has posted 2009 FZ10 as an impact risk - see above
2319	Grabbed MPEC 2009-F56 - 2009 FX10 - see above Grabbed MPEC 2009-F57 - 2009 FY10 - see above Grabbed MPEC 2009-F58 - 2009 FZ10 - see above
1843	Grabbed MPEC 2009-F55 - 2009 EC - see above
1557	Noted that NEODyS has updated its 2009 FE risk assessment - see above Noted that NEODyS has updated its 2009 FG1 risk assessment - see above Noted that NEODyS has updated its 2009 FJ risk assessment - see above Noted that NEODyS has updated its 2009 FS risk assessment - see above Grabbed MPEC 2009-F54 - Comet C/2009 F4 (McNaught) - see above
1556	Noted that JPL Sentry has updated its 2009 FE risk assessment - see above Noted that JPL Sentry has updated its 2009 FG1 risk assessment - see above Noted that JPL Sentry has updated its 2009 FJ risk assessment - see above Noted that JPL Sentry has updated its 2009 FP risk assessment - see above Noted that JPL Sentry has reposted 2009 FS as an impact risk - see above Noted that NEODyS has posted 2009 FU4 as an impact risk - see above Noted that NEODyS has posted 2009 FV4 as an impact risk - see above Noted that NEODyS has posted 2009 FZ4 as an impact risk - see above
0727	Grabbed MPEC 2009-F53 - Daily Orbit Update - see above
0705	Noted that JPL Sentry has removed 2009 DO111 as an impact risk - see above
0556	Noted Radar Astrometry database update - see above
0425	Noted that JPL Sentry has updated its 2009 DO111 risk assessment - see above Noted that JPL Sentry has updated its 2009 FE risk assessment - see above Noted that JPL Sentry has updated its 2009 FG risk assessment - see above Noted that JPL Sentry has updated its 2009 FG1 risk assessment - see above Noted that JPL Sentry has updated its 2009 FJ risk assessment - see above Noted that JPL Sentry has updated its 2009 FP risk assessment - see above Noted that JPL Sentry has reposted 2009 FS4 as an impact risk - see above Noted that JPL Sentry has reposted 2009 FU4 as an impact risk - see above Noted that JPL Sentry has reposted 2009 FV4 as an impact risk - see above Noted that JPL Sentry has reposted 2009 FZ4 as an impact risk - see above
0208	Grabbed MPEC 2009-F52 - 1999 EF5 - see above

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