2010-02-19 Tracking News

Contents on 19 February '10

IAU Minor Planet Center
- NEOCP Activity -- seven listings: 3 new, 4 updated
- New MPECs -- nine MPECs
Observers -- 20 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
News image catalog
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 19 February '10

The MPC's NEO Confirmation Page has 7 listings: 3 new, 4 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three new and four updated listings. Of these, two were "one nighters." So far The Tracking News has counted a total of 23 listings on the NEOCP at some point today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs on 19 February '10

Minor Planet Electronic Circulars

As of last check at 2348 UTC, there have been nine MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2010-D47 time-stamped "05:15 UT" - 2010 DN1 - see below
MPEC 2010-D48 time-stamped "07:22 UT" - Daily Orbit Update - see below
MPEC 2010-D49 time-stamped "18:15 UT" - 2010 DT1 - see below
MPEC 2010-D50 time-stamped "18:21 UT" - 2010 DU1 - see below
MPEC 2010-D51 time-stamped "19:10 UT" - Comet P/2010 D1 (WISE) - see below
MPEC 2010-D52 time-stamped "22:05 UT" - 2010 DW1 - see below
MPEC 2010-D53 time-stamped "22:09 UT" - 2010 DX1 - see below
MPEC 2010-D54 time-stamped "22:11 UT" - 2010 DY1 - see below
MPEC 2010-D55 time-stamped "22:19 UT" - 2010 DZ1

MPEC 2010-D55 - "22:19 UT" - 2010 DZ1

K10D01Z 2010 DZ1 (small asteroid, H=25.3 ~29m) was discovered at 0737 UT on 19 Feb. by the Catalina Sky Survey (CSS), which observed it at Feb. 19.32-34p4. The discovery was confirmed by Astronomical Research Obs. Westfield (ARO Westfield) (Feb. 19.43p5), Tenagra II Obs. (Feb. 19.44-45p3 & 19.51p1), Magdalena Ridge Obs. (MRO) (Feb. 19.46-49p4), and Great Shefford Obs. (Feb. 19.84p3).

MPEC 2010-D54 - "22:11 UT" - 2010 DY1

K10D01Y 2010 DY1 (small asteroid, H=25.8 ~23m) was discovered at 0655 UT on 19 Feb. by CSS, which observed it at Feb. 19.29-31p4 and 19.44-46p4. The discovery was confirmed by MRO (Feb. 19.41-44p4), Tenagra II Obs. (Feb. 19.44p3), ARO Westfield (Feb. 19.44-45p3), and Great Shefford Obs. (Feb. 19.84-85p3).

MPEC 2010-D53 - "22:09 UT" - 2010 DX1

K10D01X 2010 DX1 (Q=4.429 AU, H=21.2 ~195m) was discovered at 0653 UT on 19 Feb. by CSS, which observed it at Feb. 19.29-42p11. The discovery was confirmed by MRO (Feb. 19.40-43p4), ARO Westfield (Feb. 19.42-43p4), Tenagra II Obs. (Feb. 19.43p3), and Great Shefford Obs. (Feb. 19.81-82p3).

MPEC 2010-D52 - "22:05 UT" - 2010 DW1

K10D01W 2010 DW1 (Earth MOID=3.1 LD, H=19.3 ~467m) was discovered at 1120 UT on 17 Feb. by LINEAR, which observed it at Feb. 17.47-51p4. The discovery was confirmed by the Siding Spring Survey (SSS) (Feb. 19.75p5).

MPEC 2010-D51 - "19:10 UT" - Comet P/2010 D1 (WISE)

PK10D010 P/2010 D1 (WISE) (q=2.669 AU, Q=5.627 AU, TP=2009 June 25.58992 TT) from CSS (Nov. 9.42-44p4 & Dec. 10.34-36p4), WISE (Feb. 17.34p1, 17.47p1, 17.61p1, 17.74p1, 17.87p1, 18.14p1 & 18.20p1), and the Spacewatch 1.8m telescope (Feb. 19.23-25p3)

MPEC 2010-D50 - "18:21 UT" - 2010 DU1

K10D01U 2010 DU1 (small asteroid, Earth MOID=3.0 LD, H=26.5 ~17m) was discovered at 0619 UT on 18 Feb. by the Mt. Lemmon Survey (MLS), which observed it at Feb. 18.26-27p4, 18.33p5, and 19.31-32p5. The discovery was confirmed by MRO (Feb. 19.33-36p4) and Tenagra II Obs. (Feb. 19.42-43p3). This object will be coming within ten lunar distances (LD) of Earth, reaching 5.0 LD on 25 Feb.

MPEC 2010-D49 - "18:15 UT" - 2010 DT1

K10D01T 2010 DT1 (small asteroid, H=23.8 ~59m) was discovered at 0441 UT on 18 Feb. by MLS, which observed it at Feb. 18.20-23p9 at V=20.9-22.1, 18.28p4 at V=21.1-22.1, 18.33-34p3 at V=20.7-21.1, and 19.25p4 at V=21.1-4. The discovery was confirmed by Tenagra II Obs. (Feb. 19.16-18p2) and MRO (Feb. 19.31-33p3).

<< DOU on 19 Feb. '10 >> MPEC 2010-D48 - "07:22 UT" - Daily Orbit Update

Observations of risk-listed objects
K10D01H 2010 DH1 (arc=2 days, H=19.5 ~426m) from Spacewatch 1.8m (Feb. 19.18-19p2)
K10D00P 2010 DP (i=37.8°, arc=2 days, H=18.4 ~708m) from ARO Westfield (Feb. 18.39-40p3), Spacewatch 1.8m (Feb. 18.44p3), MRO (Feb. 18.46-48p3), and Tenagra II Obs. (Feb. 18.51p3)
K10D00M 2010 DM (q=0.340 AU, arc=2 days, H=19.0 ~537m) from MRO (Feb. 18.39-41p3)
K10C55H 2010 CH55 (arc=3 days, H=19.6 ~407m) from ARO Westfield (Feb. 18.31-32p3), Spacewatch 1.8m (Feb. 18.31-32p3), and MRO (Feb. 18.41-43p3)
K10C44N 2010 CN44 (Q=4.336 AU, arc=3 days, H=19.4 ~446m) from Spacewatch 1.8m (Feb. 18.10p3)
K10C19S 2010 CS19 (small asteroid, arc=3 days, H=28.0 ~9m) from Spacewatch 1.8m (Feb. 18.33-34p3), ARO Westfield (Feb. 18.35-37p5 & 18.42-45p3), and MRO (Feb. 18.41-43p6 at R=20.2-22.5)
K10C19Q 2010 CQ19 (small asteroid, Q=4.953 AU, arc=3 days, H=27.0 ~13m) from Spacewatch 1.8m (Feb. 18.29p3)
K10C19G 2010 CG19 (i=60.7°, arc=4 days, H=19.5 ~426m) from Desert Moon Obs. (Feb. 18.22-26p3)
K10C05R 2010 CR5 (Q=5.012 AU, arc=10 days, H=19.9 ~355m) from Spacewatch 1.8m (Feb. 19.20-21p3)
K10C00A 2010 CA (small asteroid, arc=9 days, H=24.5 ~43m) from Schiaparelli Obs. (Feb. 7.93-95p5)
Observations of recently (no longer) risk-listed objects
K10D00A 2010 DA (arc=2 days, H=20.2 ~309m) from Desert Moon Obs. (Feb. 18.19-20p3), ARO Westfield (Feb. 18.21p2), and SSS (Feb. 18.42p1)
K10C44O 2010 CO44 (small asteroid, arc=3 days, H=24.6 ~41m) from Chabot Obs. (Feb. 18.20-21p3)
K10C19F 2010 CF19 (almost small, arc=4 days, H=21.8 ~148m) from LINEAR (Feb. 18.16-20p4)
Observations of small asteroids (H>22.0)
K10C55D 2010 CD55 (arc=3 days, H=23.0 ~85m) from Tenagra II Obs. (Feb. 18.19p2)
K10C19P 2010 CP19 (arc=3 days, H=25.8 ~23m) from ARO Westfield (Feb. 18.40-42p4) and Tenagra II Obs. (Feb. 18.49p2)
K10C19M 2010 CM19 (arc=4 days, H=25.0 ~34m) from ARO Westfield (Feb. 18.46-48p3)
K10C19C 2010 CC19 (i=45.5°, q=0.274 AU, arc=5 days, H=22.2 ~123m) from Klet Obs. (Feb. 16.94p2) and Tenagra II Obs. (Feb. 18.19p3)
K10C18J 2010 CJ18 (arc=5 days, H=26.8 ~15m) from ARO Westfield (Feb. 18.37-38p6) and Tenagra II Obs. (Feb. 18.45p3)
K10C00N 2010 CN (arc=12 days, H=23.4 ~71m) from Schiaparelli Obs. (Feb. 8.01-02p2) and ARO Westfield (Feb. 18.24-25p5)
K02X38Y 2002 XY38 (arc=2 opp, H=22.9 ~89m) from LINEAR (Feb. 18.15-20p5)
Observations of almost-small asteroids (21.7<H<=22.0)
K10D01F 2010 DF1 (arc=1 day, H=21.9 ~141m) from ARO Westfield (Feb. 18.27-29p3)
Observations of other objects
K10D00O 2010 DO (arc=2 days, H=21.6 ~162m) from CSS (Feb. 18.40-41p3) and Tenagra II Obs. (Feb. 18.48p3)
K10D00C 2010 DC (q=1.781 AU, arc=2 days, H=18.4 ~708m) from Tenagra II Obs. (Feb. 18.38-39p3)
K10C44M 2010 CM44 (arc=5 days, H=19.1 ~513m) from ARO Westfield (Feb. 18.38-39p3) and Desert Moon Obs. (Feb. 18.40-42p5)
K10C18L 2010 CL18 (arc=5 days, H=18.5 ~676m) from Desert Moon Obs. (Feb. 17.43-44p5 & 18.43-44p5), ARO Westfield (Feb. 18.46-47p4), and CSS (Feb. 18.50-51p4)
K10C18H 2010 CH18 (Q=4.058 AU, arc=10 days, H=18.8 ~589m) from WISE (Feb. 10.14p1) and Tenagra II Obs. (Feb. 19.11-12p3)
K10C01O 2010 CO1 from WISE (Feb. 2.21p1 & 2.61p1)
K10C01L 2010 CL1 (arc=9 days, H=19.5 ~426m) from Schiaparelli Obs. (Feb. 12.93-95p3) and ARO Westfield (Feb. 18.23p3)
K10B03C 2010 BC3 (Q=5.258 AU, arc=28 days, H=20.4 ~282m) from Schiaparelli Obs. (Feb. 13.14-16p3), ARO Westfield (Feb. 18.37-38p3), and CSS (Feb. 18.43-46p4)
K10B03B 2010 BB3 (arc=28 days, H=20.4 ~282m) from Petit Jean Mtn. South Obs. (PJMSO) (Feb. 18.35-36p6)
K10B02G 2010 BG2 (i=43.1°, q=0.313 AU, Q=6.491 AU, arc=27 days, H=19.9 ~355m) from Schiaparelli Obs. (Feb. 7.98-99p3)
K09X02C 2009 XC2 (Q=4.188 AU, arc=69 days, H=17.0 ~1.35 km) from Desert Moon Obs. (Feb. 18.46-47p5) and ARO Westfield (Feb. 18.49-50p3)
K09U18V 2009 UV18 (Q=5.187 AU, arc=2 opp, H=15.8 ~2.34 km, q=1.167 AU) from ARO Westfield (Feb. 18.49p2)
K09U03N 2009 UN3 (i=37.4°, arc=122 days, H=18.5 ~676m) from Hamamatsu-Yuto Obs. (Feb. 18.76-80p8)
K08E09B 2008 EB9 (arc=2 opp, H=20.4 ~282m) from the Spacewatch 0.9m telescope (Feb. 18.31-35p3)
K08E05V 2008 EV5 (arc=3 opp, H=20.0 ~339m) from WISE (Feb. 10.56p2, 10.69p1, 10.82p1, 10.89p1, 10.95p1, 11.02p1, 11.09p1, 11.22p1, 11.29p1, 11.35p1, 11.42p1, 11.48p1, 11.55p1, 11.62p1, 11.68p1, 11.81p1, 11.95p1, 12.01p1, 12.15p1, 12.21p1, 12.28p1, 12.34p1, 12.41p1, 12.54p1, 12.61p1, 12.67p1, 12.74p1, 12.81p1, 12.87p1, 13.14p1, 13.20p1, 13.27p2, 13.34p1, 13.60p2, 13.67p1, 13.73p1, 13.80p1, 13.87p1, 14.06p1, 14.13p1, 14.20p1, 14.26p1, 14.33p1, 14.39-40p2, 14.46p1, 14.53p1, 14.59p1, 14.66p1, 14.73p1, 14.92p1, 14.99p1, 15.06p1, 15.12p1, 15.19p1, 15.26p1, 15.32p1 & 15.39p1)
K08E00E 2008 EE (arc=3 opp, H=19.7 ~389m) from PJMSO (Feb. 18.40-41p5)
K07U03R 2007 UR3 (arc=3 opp, H=21.2 ~195m) from LINEAR (Feb. 17.21-26p5)
K06E01E 2006 EE1 (i=36.4°, arc=2 opp, H=19.8 ~371m) from LINEAR (Feb. 17.39-44p5)
K06A04O 2006 AO4 (Q=4.162 AU, arc=4 opp, H=15.5 ~2.69 km, q=1.098 AU) from Schiaparelli Obs. (Feb. 8.04-05p3)
K05T51Y 2005 TY51 (Q=4.048 AU, arc=2 opp, H=17.7 ~977m) from PJMSO (Feb. 18.14-16p5)
K03C11H 2003 CH11 (i=36.4°, arc=2 opp, H=19.5 ~426m) from PJMSO (Feb. 18.32p5)
K03B47T 2003 BT47 (arc=4 opp, H=17.4 ~1.12 km) from Velikie Luki Obs. (Feb. 17.79-80p2 & 17.84p1), PJMSO (Feb. 18.36-37p5), and Naef Obs. (Feb. 18.87-89p2)
K03B35Q 2003 BQ35 (arc=3 opp, H=20.3 ~295m) from Spacewatch 1.8m (Feb. 18.51-52p3 at V=21.9-22.5)
K02W00P 2002 WP (arc=3 opp, H=18.5 ~676m) from PJMSO (Feb. 18.13-14p6)
K02N16W 2002 NW16 (arc=2 opp, H=18.1 ~812m) from LINEAR (Feb. 17.09-14p5)
K02N16V 2002 NV16 (arc=4 opp, H=21.3 ~186m) from Spacewatch 0.9m (Feb. 18.21-24p3)
K02C58Y 2002 CY58 (arc=2 opp, H=21.0 ~214m) from MLS (Feb. 18.29-31p5)
K02AC9J 2002 AJ129 (q=0.117 AU, arc=3 opp, H=18.5 ~676m) from Naef Obs. (Feb. 18.86-90p3)
K01P09T 2001 PT9 (arc=2 opp, H=20.6 ~257m) from PJMSO (Feb. 18.36p5)
K00CA1O 2000 CO101 (arc=2 opp, H=19.0 ~537m) from PJMSO (Feb. 18.43-44p5) and Hamamatsu-Yuto Obs. (Feb. 18.73-76p6)
J99R32C 1999 RC32 (arc=4 opp, H=18.4 ~708m) from PJMSO (Feb. 18.42-43p5)
J96B01A 1996 BA1 (arc=2 opp, H=20.7 ~245m) from LINEAR (Feb. 17.33-38p5 & 18.33-37p3)
L4088 214088 2004 JN13 from PJMSO (Feb. 18.07-08p5)
H5706 175706 1996 FG3 from LINEAR (Feb. 17.28-33p5)
G3132 163132 2002 CU11 from Tzec Maun Obs. Moorook (Feb. 17.69-72p2)
G2998 162998 2001 SK162 from LINEAR (Feb. 17.09-14p5)
G2038 162038 1996 DH from LINEAR (Feb. 18.27-32p4)
F3814 153814 2001 WN5 from ARO Westfield (Feb. 18.42-44p2)
D7925 137925 2000 BJ19 from LINEAR (Feb. 18.17-21p4)
99248 99248 2001 KY66 from LINEAR (Feb. 18.22-26p4)
96631 96631 1999 FP59 from MLS (Feb. 18.41-43p4)
86067 86067 1999 RM28 from Naef Obs. (Feb. 18.86-88p2)
54789 54789 2001 MZ7 from Hamamatsu-Yuto Obs. (Feb. 18.46-50p5)
53110 53110 1999 AR7 from Desert Moon Obs. (Feb. 18.51-53p2)
40263 40263 1999 FQ5 from LINEAR (Feb. 18.34-39p4)
27346 27346 2000 DN8 from LINEAR (Feb. 18.15-20p5)
16064 16064 1999 RH27 from LINEAR (Feb. 17.34-39p5) and MLS (Feb. 18.42-44p4)
08567 8567 1996 HW1 from LINEAR (Feb. 17.35-39p4)
04015 4015 Wilson-Harrington (1979 VA) from LINEAR (Feb. 17.09-14p4) and MLS (Feb. 18.14-17p4)
02368 2368 Beltrovata (1977 RA) from LINEAR (Feb. 18.35-39p4)
01864 1864 Daedalus (1971 FA) from LINEAR (Feb. 17.40-45p5)

MPEC 2010-D47 - "05:15 UT" - 2010 DN1

K10D01N 2010 DN1 (H=18.5 ~676m) was discovered at 0330 UT on 17 Feb. by MLS, which observed it at Feb. 17.15-16p3, 17.23-24p4, 18.14-16p2, and 19.10-11p4. The discovery was confirmed by MRO (Feb. 17.24-26p4 & 18.20-24p4) and Tenagra II Obs. (Feb. 18.13-14p3 & 19.09-11p3).

Observers on 19 February '10

A total of 20 observing facilities appear in today's MPECs.

Code	Observer / observatory
`H21`	Astronomical Research Obs. Westfield (ARO Westfield) in Illinois, 19 in MPECs 2010-D48, 2010-D53, 2010-D54 & 2010-D55 -- 2010 DZ1, 2010 DY1, 2010 DX1, 2010 DP, 2010 DF1, 2010 DA, 2010 CS19, 2010 CP19, 2010 CN, 2010 CM44, 2010 CM19, 2010 CL18, 2010 CL1, 2010 CJ18, 2010 CH55, 2010 BC3, 2009 XC2, 2009 UV18, 153814
`703`	Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2010-D48, 2010-D51, 2010-D53, 2010-D54 & 2010-D55 -- 2010 DZ1, 2010 DY1, 2010 DX1, 2010 DO, P/2010 D1, 2010 CL18, 2010 BC3
`G58`	Chabot Obs. in northern California, 1 in MPEC 2010-D48 -- 2010 CO44
`448`	Desert Moon Obs. in New Mexico, 6 in MPEC 2010-D48 -- 2010 DA, 2010 CM44, 2010 CL18, 2010 CG19, 2009 XC2, 53110
`J95`	Great Shefford Obs. in England, 3 in MPECs 2010-D53, 2010-D54 & 2010-D55 -- 2010 DZ1, 2010 DY1, 2010 DX1
`379`	Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2010-D48 -- 2009 UN3, 2000 CO101, 54789
`046`	Klet Obs. in the Czech Republic, 1 in MPEC 2010-D48 -- 2010 CC19
`704`	LINEAR in New Mexico, 19 in MPECs 2010-D48 & 2010-D52 -- 2010 DW1, 2010 CF19, 2007 UR3, 2006 EE1, 2002 XY38, 2002 NW16, 1996 BA1, 99248, 40263, 27346, 175706, 162998, 162038, 16064, 137925, 8567, 4015, 2368, 1864
`H01`	Magdalena Ridge Obs. (MRO) in New Mexico, 10 in MPECs 2010-D47, 2010-D48, 2010-D49, 2010-D50, 2010-D53, 2010-D54 & 2010-D55 -- 2010 DZ1, 2010 DY1, 2010 DX1, 2010 DU1, 2010 DT1, 2010 DP, 2010 DN1, 2010 DM, 2010 CS19, 2010 CH55
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2010-D47, 2010-D48, 2010-D49 & 2010-D50 -- 2010 DU1, 2010 DT1, 2010 DN1, 2002 CY58, 96631, 16064, 4015
`A13`	Naef Obs. in Switzerland, 3 in MPEC 2010-D48 -- 2003 BT47, 2002 AJ129, 86067
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 10 in MPEC 2010-D48 -- 2010 BB3, 2008 EE, 2005 TY51, 2003 CH11, 2003 BT47, 2002 WP, 2001 PT9, 2000 CO101, 1999 RC32, 214088
`204`	Schiaparelli Obs. in Italy, 6 in MPEC 2010-D48 -- 2010 CN, 2010 CL1, 2010 CA, 2010 BG2, 2010 BC3, 2006 AO4
`E12`	Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2010-D48 & 2010-D52 -- 2010 DW1, 2010 DA
`691`	Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2010-D48 -- 2008 EB9, 2002 NV16
`291`	Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2010-D48 & 2010-D51 -- 2010 DP, 2010 DH1, P/2010 D1, 2010 CS19, 2010 CR5, 2010 CQ19, 2010 CN44, 2010 CH55, 2003 BQ35
`926`	Tenagra II Obs. in Arizona, 14 in MPECs 2010-D47, 2010-D48, 2010-D49, 2010-D50, 2010-D53, 2010-D54 & 2010-D55 -- 2010 DZ1, 2010 DY1, 2010 DX1, 2010 DU1, 2010 DT1, 2010 DP, 2010 DO, 2010 DN1, 2010 DC, 2010 CP19, 2010 CJ18, 2010 CH18, 2010 CD55, 2010 CC19
`D96`	Tzec Maun Obs. Moorook in South Australia, 1 in MPEC 2010-D48 -- 163132
`C00`	Velikie Luki Obs. in Russia, 1 in MPEC 2010-D48 -- 2003 BT47
`C51`	WISE in Earth polar orbit, 4 in MPECs 2010-D48 & 2010-D51 -- P/2010 D1, 2010 CO1, 2010 CH18, 2008 EV5

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

Impact Risk Monitoring on 19 February '10

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2348 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

2010 DJ1	JPL Sentry	2102	R E M O V E D						JPL: Risk listing removed at 2051 UTC.

2010 DH1	JPL Sentry	1422	R E M O V E D						JPL: Risk listing removed at 1133 UTC.

2010 DG1	NEODyS	1422	2051	1	2.05e-10	-9.13	-9.13	0	NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2010/02/17.211 to 2010/02/18.288."

2010 DP	JPL Sentry	1422	R E M O V E D						JPL: Risk listing removed at 1131 UTC.
2010 DP	NEODyS	1422	R E M O V E D						-

2010 DM	JPL Sentry	1422	2030-2108	6	1.7e-09	-4.84	-5.10	0	JPL: "Analysis based on 19 observations spanning 2.0815 days (2010-Feb-16.32523 to 2010-Feb-18.40672)." Diameter approximately 0.713 km. from mean, weighted H=18.4.
2010 DM	NEODyS	1422	2030-2072	4	7.95e-10	-4.99	-5.06	0	NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2010/02/16.326 to 2010/02/18.407."

2010 CH55	JPL Sentry	1422	2022-2091	58	2.1e-08	-4.80	-5.91	0	JPL: "Analysis based on 32 observations spanning 2.9632 days (2010-Feb-15.466 to 2010-Feb-18.42924)." Diameter approximately 0.519 km. from mean, weighted H=19.1.
2010 CH55	NEODyS	1422	2084-2088	3	2.11e-10	-7.22	-7.55	0	NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2010/02/15.467 to 2010/02/18.430."

2010 CN44	JPL Sentry	1422	2054-2096	11	1.7e-07	-3.98	-4.18	0	JPL: "Analysis based on 15 observations spanning 2.9937 days (2010-Feb-15.11003 to 2010-Feb-18.10369)." Diameter approximately 0.475 km. from mean, weighted H=19.3.
2010 CN44	NEODyS	1422	2059-2070	2	1.13e-07	-4.21	-4.38	0	NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2010/02/15.111 to 2010/02/18.104."

2010 CS19	JPL Sentry	1422	2104	4	3.7e-05	-6.30	-6.33	0	JPL: "Analysis based on 40 observations spanning 3.1225 days (2010-Feb-15.32692 to 2010-Feb-18.449459)." Diameter approximately 0.008 km. from mean, weighted H=28.0.
2010 CS19	NEODyS	1422	R E M O V E D						-

2010 CQ19	JPL Sentry	1422	2105	1	6.7e-08	-8.40	-8.40	0	JPL: "Analysis based on 18 observations spanning 3.0147 days (2010-Feb-15.27907 to 2010-Feb-18.29375)." Diameter approximately 0.013 km. from mean, weighted H=27.1.

2010 CG19	NEODyS	1422	2019-2084	4	2.39e-08	-4.65	-4.92	0	NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2010/02/14.284 to 2010/02/18.256."

2010 CR5	JPL Sentry	1422	2032-2087	6	2.7e-08	-4.69	-4.90	0	JPL: "Analysis based on 35 observations spanning 9.8836 days (2010-Feb-09.3273 to 2010-Feb-19.21089)." Diameter approximately 0.369 km. from mean, weighted H=19.8.
2010 CR5	NEODyS	1422	2030-2087	7	2.6e-08	-4.62	-4.80	0	NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2010/02/09.328 to 2010/02/19.212."

2010 CA	JPL Sentry	1422	2022	1	8.5e-06	-4.13	-4.13	0	JPL: "Analysis based on 59 observations spanning 8.9008 days (2010-Feb-05.19638 to 2010-Feb-14.097229)." Diameter approximately 0.043 km. from mean, weighted H=24.5.
2010 CA	NEODyS	1422	2022-2082	2	8.74e-06	-4.11	-4.11	0	NEODyS: "Based on 59 optical observations (of which 0 are rejected as outliers) from 2010/02/05.197 to 2010/02/14.098."

2001 WN5	JPL Sentry	1802	2133	1	7.6e-05	-1.30	-1.30	-	JPL: "Analysis based on 121 observations spanning 5122.0 days (1996-Feb-10.39593 to 2010-Feb-18.441914)." Diameter approximately 0.780 km. from mean, weighted H=18.2.
2001 WN5	NEODyS	1422	2107-2133	2	1.04e-04	-1.18	-1.18	-	NEODyS: "Based on 125 optical observations (of which 7 are rejected as outliers) from 1996/02/10.397 to 2010/02/18.443."

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 19 February '10

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

2239	Grabbed MPEC 2010-D52 - 2010 DW1 - see above Grabbed MPEC 2010-D53 - 2010 DX1 - see above Grabbed MPEC 2010-D54 - 2010 DY1 - see above Grabbed MPEC 2010-D55 - 2010 DZ1 - see above
2102	Noted that JPL Sentry has removed 2010 DJ1 as an impact risk - see above
2001	Grabbed MPEC 2010-D51 - Comet P/2010 D1 (WISE) - see above
1901	Grabbed MPEC 2010-D49 - 2010 DT1 - see above Grabbed MPEC 2010-D50 - 2010 DU1 - see above
1802	Noted that JPL Sentry has updated its 153814 2001 WN5 risk assessment - see above
1422	Noted that NEODyS has updated its 153814 2001 WN5 risk assessment - see above Noted that JPL Sentry has updated its 2010 CA risk assessment - see above Noted that NEODyS has updated its 2010 CA risk assessment - see above Noted that NEODyS has updated its 2010 CG19 risk assessment - see above Noted that JPL Sentry has updated its 2010 CH55 risk assessment - see above Noted that NEODyS has updated its 2010 CH55 risk assessment - see above Noted that JPL Sentry has posted 2010 CN44 as an impact risk - see above Noted that NEODyS has updated its 2010 CN44 risk assessment - see above Noted that JPL Sentry has reposted 2010 CQ19 as an impact risk - see above Noted that JPL Sentry has updated its 2010 CR5 risk assessment - see above Noted that NEODyS has updated its 2010 CR5 risk assessment - see above Noted that JPL Sentry has updated its 2010 CS19 risk assessment - see above Noted that NEODyS has removed 2010 CS19 as an impact risk - see above Noted that NEODyS has posted 2010 DG1 as an impact risk - see above Noted that JPL Sentry has removed 2010 DH1 as an impact risk - see above Noted that JPL Sentry has updated its 2010 DM risk assessment - see above Noted that NEODyS has updated its 2010 DM risk assessment - see above Noted that JPL Sentry has removed 2010 DP as an impact risk - see above Noted that NEODyS has removed 2010 DP as an impact risk - see above Grabbed MPEC 2010-D48 - Daily Orbit Update - see above
0651	Grabbed MPEC 2010-D47 - 2010 DN1 - see above

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