2009-02-20 Tracking News

Contents on 20 February '09

IAU Minor Planet Center
- NEOCP Activity -- five listings: 5 updated
- New MPECs -- seven MPECs
Observers -- 32 observing facilities
Impact Risk Monitoring -- six 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 20 February '09

The MPC's NEO Confirmation Page has 5 listings: 5 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had five updated listings. All of these were "one nighters." 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 20 February '09

Minor Planet Electronic Circulars

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

MPEC 2009-D34 time-stamped "07:07 UT" - Daily Orbit Update - see below
MPEC 2009-D35 time-stamped "15:37 UT" - 2009 DL1 - see below
MPEC 2009-D36 time-stamped "15:40 UT" - 2009 DM1 - see below
MPEC 2009-D37 time-stamped "15:44 UT" - 2009 DN1 - see below
MPEC 2009-D38 time-stamped "15:47 UT" - 2009 DO1 - see below
MPEC 2009-D39 time-stamped "19:36 UT" - Comet P/2001 CV8 = 2009 D1 (LINEAR) - see below
MPEC 2009-D40 time-stamped "20:47 UT" - 2009 DR3

MPEC 2009-D40 - "20:47 UT" - 2009 DR3

K09D03R 2009 DR3 (Earth MOID=4.2 LD, H=21.5 ~170m) was discovered at 0758 UT on 20 Feb. by the Catalina Sky Survey (CSS), which observed it at Feb. 20.33-38p7. The discovery was confirmed by Magdalena Ridge Obs. (MRO) (Feb. 20.37-38p4), Sabino Canyon Obs. (Feb. 20.40p3), Astronomical Research Obs. (ARO) (Feb. 20.42-43p3), Ernesto Guido via RAS Obs. Mayhill (Feb. 20.49-50p2), and Balzaretto Obs. (Feb. 20.82-83p3). This object will be coming within ten lunar distances (LD) of Earth, reaching 8.1 LD on 18 March.

MPEC 2009-D39 - "19:36 UT" - Comet P/2001 CV8 = 2009 D1 (LINEAR)

PK09D010 P/2009 D1 (q=2.160 AU, Q=5.611 AU, TP=2008 Oct. 10.97675 TT) from the Spacewatch 1.8m telescope (Feb. 19.53-55p3 & 20.49-51p3)
PK01C08V P/2001 CV8 (LINEAR) (q=2.152 AU, Q=5.605 AU, TP=2001 Feb. 12.27294 TT)

MPEC 2009-D38 - "15:47 UT" - 2009 DO1

K09D01O 2009 DO1 (small asteroid, H=23.1 ~81m) was discovered at 1117 UT on 19 Feb. by the Spacewatch 0.9m telescope, which observed it at Feb. 19.47-51p3. The discovery was confirmed by Calar Alto Obs. (Feb. 19.00p3), ARO (Feb. 20.39p3), MRO (Feb. 20.39-42p5), Sandlot Obs. (Feb. 20.42-43p3), Spacewatch 1.8m (Feb. 20.42-43p3), and Sabino Canyon Obs. (Feb. 20.44p3).

MPEC 2009-D37 - "15:44 UT" - 2009 DN1

K09D01N 2009 DN1 (H=20.2 ~309m) was discovered at 0507 UT on 19 Feb. by LINEAR, which observed it at Feb. 19.21-26p5. The discovery was confirmed by Calar Alto Obs. (Feb. 19.98p3), Farpoint Obs. (Feb. 20.07-08p2), ARO (Feb. 20.19-20p3), MRO (Feb. 20.22-24p5), and Sabino Canyon Obs. (Feb. 20.28-30p3).

MPEC 2009-D36 - "15:40 UT" - 2009 DM1

K09D01M 2009 DM1 (risk-listed, Q=4.652 AU, H=17.0 ~1.35 km) was discovered at 0245 UT on 19 Feb. by CSS, which observed it at Feb. 19.11-13p4. The discovery was confirmed by Sabino Canyon Obs. (Feb. 19.16-17p3), MRO (Feb. 19.17-18p4), Calar Alto Obs. (Feb. 19.79-80p3), ARO (Feb. 20.02-03p3), and Farpoint Obs. (Feb. 20.05-06p4).

MPEC 2009-D35 - "15:37 UT" - 2009 DL1

K09D01L 2009 DL1 (H=18.9 ~562m) was discovered at 0017 UT on 19 Feb. by Crni Vrh Obs., which observed it at Feb. 19.01-04p4. The discovery was confirmed by Jim Young via Table Mtn. Obs. (Feb. 19.32-36p4 & 20.34-37p4), LINEAR (Feb. 19.34-39p4), Guido/RAS Mayhill (Feb. 19.34-36p2), Spacewatch 0.9m (Feb. 19.41-44p3), MRO (Feb. 19.42-43p4 & 20.45-47p4), Calar Alto Obs. (Feb. 19.99p3), Schiaparelli Obs. (Feb. 20.15-16p3), Sandlot Obs. (Feb. 20.40-41p3), ARO (Feb. 20.40-41p3), Spacewatch 1.8m (Feb. 20.40-41p3), and Sabino Canyon Obs. (Feb. 20.42-43p3).

<< DOU on 20 Feb. '09 >> MPEC 2009-D34 - "07:07 UT" - Daily Orbit Update

Observations of risk-listed objects
K09D01F 2009 DF1 (arc=1 day, H=20.5 ~269m) from Calar Alto Obs. (Feb. 19.99p3)
K09C05Q 2009 CQ5 (arc=5 days, H=17.6 ~1.02 km) from Desert Moon Obs. (Feb. 19.08-10p3)
K09B81F 2009 BF81 (small asteroid, arc=20 days, H=25.2 ~31m) from MRO (Feb. 20.25-27p4 at R=21.9-22.9)
Observations of recently (no longer) risk-listed objects
K09C05V 2009 CV5 (small asteroid, arc=5 days, H=24.8 ~37m) from Petit Jean Mtn. South Obs. (PJMSO) (Feb. 19.25-26p8) and Sormano Obs. (Feb. 20.04-05p3)
K09C04R 2009 CR4 (arc=6 days, H=21.7 ~155m) from Spacewatch 1.8m (Feb. 19.32-33p3) and Desert Moon Obs. (Feb. 19.33-37p3)
K09C03C 2009 CC3 (arc=15 days, H=18.9 ~562m) from the Siding Spring Survey (SSS) (Feb. 19.62p2 & 19.79p1)
K09C00Z 2009 CZ (arc=15 days, H=17.8 ~933m) from Lumezzane Obs. (Feb. 17.83p4)
K09C00V 2009 CV (small asteroid, arc=17 days, H=24.2 ~49m) from Wildberg Obs. (Feb. 19.75-76p9)
K09C00S 2009 CS (arc=17 days, H=19.6 ~407m) from Crni Vrh Obs. (Feb. 18.90-93p4), Los Campitos Obs. (Feb. 19.21-22p3), and LINEAR (Feb. 19.28-32p5)
Observations of small asteroids (H>22.0)
K09D01C 2009 DC1 (arc=1 day, H=24.0 ~54m) from Schiaparelli Obs. (Feb. 19.94-96p3) and Naef Obs. (Feb. 19.98-00p3)
K09D00W 2009 DW (arc=2 days, H=25.8 ~23m) from Sabino Canyon Obs. (Feb. 19.33-35p3)
K09D00V 2009 DV (arc=2 days, H=24.7 ~39m) from LINEAR (Feb. 19.26-32p4)
K09C05R 2009 CR5 (arc=5 days, H=22.1 ~129m) from Spacewatch 1.8m (Feb. 19.31-32p3)
K08T03C 2008 TC3 (arc=1 day, H=30.4 ~3m) from Alexander V. Devyatkin via Pulkovo Obs. (2008 Oct. 6.88-04p270)
Observations of almost-small asteroids (21.7<H<=22.0)
K08C00G 2008 CG (arc=2 opp, H=22.0 ~135m) from Spacewatch 1.8m (Feb. 19.21-22p3)
Observations of other objects
K09D00Z 2009 DZ (arc=2 days, H=21.4 ~178m) from Calar Alto Obs. (Feb. 19.98p3)
K09C05T 2009 CT5 (q=0.280 AU, arc=5 days, H=18.7 ~616m) from Lumezzane Obs. (Feb. 17.79p4) and Madonna di Dossobuono Obs. (Feb. 19.88p3)
K09C05S 2009 CS5 (arc=5 days, H=19.5 ~426m) from Spacewatch 1.8m (Feb. 19.34p2)
K09C05O 2009 CO5 (arc=18 days, H=21.7 ~155m) from Madonna di Dossobuono Obs. (Feb. 19.86-87p3)
K09C05N 2009 CN5 (arc=6 days, H=20.1 ~323m) from Desert Moon Obs. (Feb. 19.26-30p3), Crni Vrh Obs. (Feb. 19.74p3), and Farpoint Obs. (Feb. 20.21-22p3)
K09C01W 2009 CW1 (arc=16 days, H=21.7 ~155m) from Desert Moon Obs. (Feb. 19.50-53p3)
K09C01Q 2009 CQ1 (arc=31 days, H=20.6 ~257m) from Madonna di Dossobuono Obs. (Feb. 19.89-90p3)
K09B77E 2009 BE77 (Q=4.610 AU, arc=20 days, H=18.1 ~812m) from SSS (Feb. 1.44p1 & 19.46p2)
K09B77D 2009 BD77 (arc=20 days, H=20.4 ~282m) from PJMSO (Feb. 19.29p6) and CSS (Feb. 19.44-46p4)
K09B71A 2009 BA71 (arc=2 opp, H=20.7 ~245m) from PJMSO (Feb. 19.26-27p7)
K09A15M 2009 AM15 (arc=44 days, H=18.7 ~616m) from Desert Moon Obs. (Feb. 19.20-23p3) and SSS (Feb. 19.44-48p2)
K08Y29E 2008 YE29 (Q=4.542 AU, arc=50 days, H=20.4 ~282m) from Lumezzane Obs. (Feb. 17.82p4)
K08S07Q 2008 SQ7 (arc=149 days, H=19.9 ~355m) from SSS (Feb. 19.77-78p2)
K08R98M 2008 RM98 (Q=4.198 AU, arc=165 days, H=20.5 ~269m) from Lumezzane Obs. (Feb. 17.95-96p4)
K08E32A 2008 EA32 (IEO, Q=0.804 AU, arc=2 opp, H=16.5 ~1.70 km) from B. Conklin via RAS Obs. Mayhill (Feb. 20.07-08p2)
K08E00E 2008 EE (arc=2 opp, H=19.7 ~389m) from Verona Obs. (Feb. 19.90-91p4)
K07B02T 2007 BT2 (arc=3 opp, H=17.2 ~1.23 km) from PJMSO (Feb. 19.41-42p5)
K06W02Z 2006 WZ2 (arc=3 opp, H=16.9 ~1.41 km) from Verona Obs. (Feb. 19.92p4)
K06S06D 2006 SD6 (arc=2 opp, H=20.2 ~309m) from Spacewatch 1.8m (Feb. 19.46-47p3)
K05S25N 2005 SN25 (arc=3 opp, H=19.7 ~389m) from LINEAR (Feb. 19.10-15p5)
K05GB9W 2005 GW119 (arc=4 opp, H=18.4 ~708m) from Spacewatch 0.9m (Feb. 19.30-34p3)
K04E09U 2004 EU9 (arc=3 opp, H=18.8 ~589m) from PJMSO (Feb. 19.28-29p6)
K02H08F 2002 HF8 (arc=3 opp, H=18.5 ~676m) from Spacewatch 1.8m (Feb. 19.49-52p3)
K02C11T 2002 CT11 (i=53.9°, arc=5 opp, H=17.0 ~1.35 km) from PJMSO (Feb. 19.41p5)
K01D08R 2001 DR8 (arc=2 opp, H=18.9 ~562m) from Spacewatch 1.8m (Feb. 19.45-46p3)
J96B03Z 1996 BZ3 (Q=4.029 AU, arc=4 opp, H=18.3 ~741m) from Spacewatch 0.9m (Feb. 19.41-45p3)
K6910 206910 2004 NL8 from Crni Vrh Obs. (Feb. 19.01-04p4), LINEAR (Feb. 19.34-39p5), and Spacewatch 0.9m (Feb. 19.41-44p3)
K0840 200840 2001 XN254 from Lumezzane Obs. (Feb. 17.76-77p4)
G4400 164400 2005 GN59 from Los Campitos Obs. (Feb. 19.19p1)
G2900 162900 2001 HG31 from El Guijo Obs. (Feb. 19.85-87p3) and Posadas Obs. (Feb. 19.91-92p3)
F9504 159504 2000 WO67 from Spacewatch 0.9m (Feb. 19.16-19p3)
F3953 153953 2002 AD9 from El Guijo Obs. (Feb. 19.00-01p3)
E3651 143651 2003 QO104 from El Guijo Obs. (Feb. 20.04-05p3)
E1495 141495 2002 EZ11 from the Mt. Lemmon Survey (MLS) (Feb. 19.44p4)
D8911 138911 2001 AE2 from Calar Alto Obs. (Feb. 20.16-19p3)
85867 85867 1999 BY9 from LINEAR (Feb. 19.33-38p5)
68350 68350 2001 MK3 from El Guijo Obs. (Feb. 20.02-04p3)
14402 14402 1991 DB from LINEAR (Feb. 19.33-38p5), CSS (Feb. 19.39-42p4), and MLS (Feb. 19.41-43p4)
12711 12711 Tukmit (1991 BB) from LightBuckets Obs. Mayhill (Feb. 3.17-18p2 & 4.16-17p2)
08566 8566 1996 EN from CSS (Feb. 19.39-42p4)
07088 7088 Ishtar (1992 AA) from LINEAR (Feb. 19.45-50p5)
05332 5332 Davidaguilar (1990 DA) from CSS (Feb. 19.17-19p4)
04179 4179 Toutatis (1989 AC) from Montana Blanca Obs. (Feb. 19.88p3)
02329 2329 Orthos (1976 WA) from CSS (Feb. 19.28-31p4)
00433 433 Eros (1898 DQ) from Hugh C. Harris via U.S. Naval Obs. Flagstaff Station (USNO Flagstaff) (2004 Nov. 24.56p1, 2004 Nov. 25.56p1, 2004 Nov. 29.56p1, 2004 Nov. 30.56p1, 2004 Dec. 1.56p1, 2004 Dec. 3.56p1, 2004 Dec. 11.56p1, 2004 Dec. 15.55p1, 2004 Dec. 19.55p1, 2004 Dec. 25.54p1, 2005 May 17.18p1, 2005 May 19.17p1, 2005 May 23.16p1, 2005 May 24.16p1, 2005 May 30.15p1, 2005 May 31.15p1, 2005 June 1.15p1, 2005 June 2.14p1, 2005 June 3.14p1, 2007 May 25.48p1, 2007 May 26.48p1, 2007 May 27.48p1, 2007 May 28.47p1, 2007 May 29.47p1, 2007 June 7.44p1, 2007 June 8.44p1, 2007 June 22.39p1, 2007 June 23.38p1, 2007 June 24.38p1, 2007 June 28.36p1 & 2007 June 29.36p1)

Observers on 20 February '09

A total of 32 observing facilities appear in today's MPECs.

Code	Observer / observatory
`H55`	Astronomical Research Obs. (ARO) in Illinois, 5 in MPECs 2009-D35, 2009-D36, 2009-D37, 2009-D38 & 2009-D40 -- 2009 DR3, 2009 DO1, 2009 DN1, 2009 DM1, 2009 DL1
`A81`	Balzaretto Obs. in Italy, 1 in MPEC 2009-D40 -- 2009 DR3
`493`	Calar Alto Obs. in Spain, 7 in MPECs 2009-D34, 2009-D35, 2009-D36, 2009-D37 & 2009-D38 -- 2009 DZ, 2009 DO1, 2009 DN1, 2009 DM1, 2009 DL1, 2009 DF1, 138911
`703`	Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2009-D34, 2009-D36 & 2009-D40 -- 2009 DR3, 2009 DM1, 2009 BD77, 14402, 8566, 5332, 2329
`106`	Crni Vrh Obs. in Slovenia, 4 in MPECs 2009-D34 & 2009-D35 -- 2009 DL1, 2009 CS, 2009 CN5, 206910
`448`	Desert Moon Obs. in New Mexico, 5 in MPEC 2009-D34 -- 2009 CW1, 2009 CR4, 2009 CQ5, 2009 CN5, 2009 AM15
`J27`	El Guijo Obs. in Spain, 4 in MPEC 2009-D34 -- 68350, 162900, 153953, 143651
`734`	Farpoint Obs. in Kansas, 3 in MPECs 2009-D34, 2009-D36 & 2009-D37 -- 2009 DN1, 2009 DM1, 2009 CN5
`704`	LINEAR in New Mexico, 9 in MPECs 2009-D34, 2009-D35 & 2009-D37 -- 2009 DV, 2009 DN1, 2009 DL1, 2009 CS, 2005 SN25, 85867, 206910, 14402, 7088
`H12`	LightBuckets Obs. Mayhill in New Mexico, 1 in MPEC 2009-D34 -- 12711
`I36`	Los Campitos Obs. in Argentina, 2 in MPEC 2009-D34 -- 2009 CS, 164400
`130`	Lumezzane Obs. in Italy, 5 in MPEC 2009-D34 -- 2009 CZ, 2009 CT5, 2008 YE29, 2008 RM98, 200840
`560`	Madonna di Dossobuono Obs. in Italy, 3 in MPEC 2009-D34 -- 2009 CT5, 2009 CQ1, 2009 CO5
`H01`	Magdalena Ridge Obs. (MRO) in New Mexico, 6 in MPECs 2009-D34, 2009-D35, 2009-D36, 2009-D37, 2009-D38 & 2009-D40 -- 2009 DR3, 2009 DO1, 2009 DN1, 2009 DM1, 2009 DL1, 2009 BF81
`J46`	Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2009-D34 -- 4179
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2009-D34 -- 14402, 141495
`A13`	Naef Obs. in Switzerland, 1 in MPEC 2009-D34 -- 2009 DC1
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 6 in MPEC 2009-D34 -- 2009 CV5, 2009 BD77, 2009 BA71, 2007 BT2, 2004 EU9, 2002 CT11
`J53`	Posadas Obs. in Spain, 1 in MPEC 2009-D34 -- 162900
`0841`	Alexander V. Devyatkin via Pulkovo Obs. in Russia, 1 in MPEC 2009-D34 -- 2008 TC3
`H06%`	Ernesto Guido in Italy via RAS Obs. Mayhill in New Mexico, 2 in MPECs 2009-D35 & 2009-D40 -- 2009 DR3, 2009 DL1
`H06\`	B. Conklin via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2009-D34 -- 2008 EA32
`854`	Sabino Canyon Obs. in Arizona, 6 in MPECs 2009-D34, 2009-D35, 2009-D36, 2009-D37, 2009-D38 & 2009-D40 -- 2009 DW, 2009 DR3, 2009 DO1, 2009 DN1, 2009 DM1, 2009 DL1
`H36`	Sandlot Obs. in Kansas, 2 in MPECs 2009-D35 & 2009-D38 -- 2009 DO1, 2009 DL1
`204`	Schiaparelli Obs. in Italy, 2 in MPECs 2009-D34 & 2009-D35 -- 2009 DL1, 2009 DC1
`E12`	Siding Spring Survey (SSS) in New South Wales, 4 in MPEC 2009-D34 -- 2009 CC3, 2009 BE77, 2009 AM15, 2008 SQ7
`587`	Sormano Obs. in Italy, 1 in MPEC 2009-D34 -- 2009 CV5
`691`	Spacewatch 0.9m telescope in Arizona, 6 in MPECs 2009-D34, 2009-D35 & 2009-D38 -- 2009 DO1, 2009 DL1, 2005 GW119, 1996 BZ3, 206910, 159504
`291`	Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2009-D34, 2009-D35, 2009-D38 & 2009-D39 -- 2009 DO1, 2009 DL1, P/2009 D1, 2009 CS5, 2009 CR5, 2009 CR4, 2008 CG, 2006 SD6, 2002 HF8, 2001 DR8
`6735`	Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2009-D35 -- 2009 DL1
`6892`	Hugh C. Harris via U.S. Naval Obs. Flagstaff Station in Arizona, 1 in MPEC 2009-D34 -- 433
`A48`	Verona Obs. in Italy, 2 in MPEC 2009-D34 -- 2008 EE, 2006 WZ2
`198`	Wildberg Obs. in Germany, 1 in MPEC 2009-D34 -- 2009 CV

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

Impact Risk Monitoring on 20 February '09

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2358 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
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 DM1	JPL Sentry	1817	2010-2083	76	3.6e-08	-3.19	-3.38	0	JPL: "Analysis based on 21 observations spanning .94482 days (2009-Feb-19.11474 to 2009-Feb-20.05956)." Diameter approximately 1.100 km. from mean, weighted H=17.4.

2009 DF1	JPL Sentry	1528	2017-2081	15	4.4e-09	-5.58	-6.31	0	JPL #2 for the day: "Analysis based on 17 observations spanning .54861 days (2009-Feb-19.44059 to 2009-Feb-19.9892)." Diameter approximately 0.301 km. from mean, weighted H=20.3.
2009 DF1	NEODyS	1528	2013-2081	11	5.31e-09	-5.18	-5.58	0	NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2009/02/19.441 to 2009/02/19.990."

2009 DE1	NEODyS	1528	2040	1	4.12e-09	-7.77	-7.77	0	NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2009/02/19.390 to 2009/02/19.943."
2009 DE1	JPL Sentry	0259	2038-2106	29	1.1e-07	-6.50	-7.08	0	JPL: "Analysis based on 19 observations spanning .55238 days (2009-Feb-19.38939 to 2009-Feb-19.94177)." Diameter approximately 0.045 km. from mean, weighted H=24.4.

2009 DA1	NEODyS	1528	2028-2079	14	9.0e-09	-6.53	-6.98	0	NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2009/02/19.064 to 2009/02/19.939."
2009 DA1	JPL Sentry	0158	2028-2105	43	5.9e-08	-5.72	-6.33	0	JPL: "Analysis based on 18 observations spanning .87514 days (2009-Feb-19.06293 to 2009-Feb-19.93807)." Diameter approximately 0.120 km. from mean, weighted H=22.3.

2009 CQ5	NEODyS	1528	R E M O V E D						-
2009 CQ5	JPL Sentry	1528	R E M O V E D						JPL: Risk listing removed at 0951 UTC.

2009 BF81	JPL Sentry	1528	R E M O V E D						JPL: Risk listing removed at 0950 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 20 February '09

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

2138	Grabbed MPEC 2009-D40 - 2009 DR3 - see above
2031	Grabbed MPEC 2009-D39 - Comet P/2001 CV8 = 2009 D1 (LINEAR) - see above
1817	Noted that JPL Sentry has posted 2009 DM1 as an impact risk - see above
1628	Grabbed MPEC 2009-D35 - 2009 DL1 - see above Grabbed MPEC 2009-D36 - 2009 DM1 - see above Grabbed MPEC 2009-D37 - 2009 DN1 - see above Grabbed MPEC 2009-D38 - 2009 DO1 - see above
1528	Noted that JPL Sentry has removed 2009 BF81 as an impact risk - see above Noted that JPL Sentry has removed 2009 CQ5 as an impact risk - see above Noted that NEODyS has removed 2009 CQ5 as an impact risk - see above Noted that NEODyS has posted 2009 DA1 as an impact risk - see above Noted that NEODyS has posted 2009 DE1 as an impact risk - see above Noted that JPL Sentry has updated its 2009 DF1 risk assessment - see above Noted that NEODyS has posted 2009 DF1 as an impact risk - see above Grabbed MPEC 2009-D34 - Daily Orbit Update - see above
0259	Noted that JPL Sentry has posted 2009 DE1 as an impact risk - see above
0158	Noted that JPL Sentry has posted 2009 DA1 as an impact risk - see above Noted that JPL Sentry has posted 2009 DF1 as an impact risk - see above

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