2009-02-01 Tracking News

Contents on 1 February '09

IAU Minor Planet Center
- NEOCP Activity -- eleven listings: 2 new, 9 updated
- New MPECs -- two MPECs
Observers -- 28 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 1 February '09

The MPC's NEO Confirmation Page has 11 listings: 2 new, 9 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two new and nine updated listings. Of these, four were "one nighters." So far The Tracking News has counted a total of thirteen 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 1 February '09

Minor Planet Electronic Circulars

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

MPEC 2009-C01 time-stamped "01:36 UT" - 2001 DR8 - see below
MPEC 2009-C02 time-stamped "07:07 UT" - Daily Orbit Update

<< DOU on 1 Feb. '09 >> MPEC 2009-C02 - "07:07 UT" - Daily Orbit Update

Observations of risk-listed objects
K09B58J 2009 BJ58 (arc=3 days, H=19.0 ~537m) from Astronomical Research Obs. (ARO) (Jan. 31.00-01p3) and Great Shefford Obs. (Jan. 31.81-82p3)
K09B58F 2009 BF58 (small asteroid, arc=4 days, H=27.3 ~12m) from Sormano Obs. (Jan. 31.01p2) and the Spacewatch 1.8m telescope (Feb. 1.20-21p3)
K09B58C 2009 BC58 (arc=7 days, H=18.7 ~616m) from Spacewatch 1.8m (Feb. 1.27-28p3)
K09B05R 2009 BR5 (small asteroid, arc=11 days, H=22.1 ~129m) from Spacewatch 1.8m (Jan. 31.30-31p3)
Observations of recently (no longer) risk-listed objects
K09B05U 2009 BU5 (arc=10 days, H=21.7 ~155m) from ARO (Jan. 31.19-20p3)
K09B02E 2009 BE2 (arc=16 days, H=18.9 ~562m) from Spacewatch 1.8m (Feb. 1.24-26p3 at V=21.9-22.3)
K08Y30U 2008 YU30 (small asteroid, arc=31 days, H=23.2 ~78m) from Spacewatch 1.8m (Jan. 31.48p1)
K08Y29E 2008 YE29 (Q=4.543 AU, arc=32 days, H=20.3 ~295m) from Stia Obs. (Jan. 30.74-75p3), ARO (Jan. 31.13p3), and Walnut Creek Obs. (Jan. 31.14-17p3)
Observations of small asteroids (H>22.0)
K09B58M 2009 BM58 (Q=4.039 AU, arc=2 days, H=24.2 ~49m) from the Mt. Lemmon Survey (MLS) (Jan. 31.28-36p8 & 31.47-49p4) and LINEAR (Jan. 31.33-36p4)
K09B58K 2009 BK58 (Q=4.134 AU, arc=3 days, H=25.8 ~23m) from ARO (Jan. 31.08p3), Mt. John Obs. (Jan. 31.50p4), Great Shefford Obs. (Jan. 31.79-80p3), and the Catalina Sky Survey (CSS) (Feb. 1.20-23p8)
K09B58H 2009 BH58 (arc=3 days, H=23.5 ~68m) from the Siding Spring Survey (SSS) (Jan. 31.77p1)
K09B58G 2009 BG58 (arc=3 days, H=26.0 ~21m) from MLS (Jan. 30.36p1) and Sormano Obs. (Jan. 30.96p2)
K09B58D 2009 BD58 (arc=13 days, H=22.2 ~123m) from Sormano Obs. (Jan. 30.92-93p3), Balzaretto Obs. (Jan. 30.96-97p2), and Petit Jean Mtn. South Obs. (PJMSO) (Jan. 31.32-33p9)
K09B11H 2009 BH11 (arc=5 days, H=26.4 ~18m) from ARO (Jan. 31.31-34p3) and Spacewatch 1.8m (Jan. 31.34-35p2)
K09B11G 2009 BG11 (arc=5 days, H=22.4 ~112m) from ARO (Jan. 31.09-10p3) and SSS (Jan. 31.57p1)
K09B05S 2009 BS5 (arc=11 days, H=27.4 ~11m) from Spacewatch 1.8m (Jan. 31.32-33p3 at V=22.7-8)
K09B05Q 2009 BQ5 (arc=11 days, H=23.2 ~78m) from ARO (Jan. 31.22-24p3)
K09B02W 2009 BW2 (arc=11 days, H=25.1 ~32m) from ARO (Jan. 31.10-11p3)
K09B02H 2009 BH2 (arc=14 days, H=22.4 ~112m) from ARO (Jan. 31.20-21p3)
K08Y29G 2008 YG29 (arc=32 days, H=24.1 ~51m) from Spacewatch 1.8m (Jan. 31.26-28p3)
Observations of almost-small asteroids (21.7<H<=22.0)
K09B58O 2009 BO58 (arc=2 days, H=21.8 ~148m) from New Millennium Obs. (Jan. 31.02p3)
K08Y27N 2008 YN27 (arc=33 days, H=22.0 ~135m) from ARO (Jan. 31.10-11p2 at V=22.2-4)
K08Y03G 2008 YG3 (Q=4.061 AU, arc=40 days, H=22.0 ~135m) from Desert Moon Obs. (Jan. 31.32-39p3)
Observations of other objects
K09B77D 2009 BD77 (arc=1 day, H=20.4 ~282m) from ARO (Jan. 31.45-46p4) and MLS (Jan. 31.54-55p3)
K09B71K 2009 BK71 (i=36.2°, arc=1 day, H=19.5 ~426m) from Jurassien-Vicques Obs. (Jan. 30.80p2)
K09B58E 2009 BE58 (arc=4 days, H=21.5 ~170m) from MLS (Jan. 31.41-43p4)
K09B11B 2009 BB11 (arc=6 days, H=19.3 ~467m) from ARO (Jan. 31.42-43p3)
K09B05T 2009 BT5 (arc=11 days, H=20.5 ~269m) from Stia Obs. (Jan. 30.86-87p3), MLS (Jan. 31.31-33p3), and LINEAR (Jan. 31.33-38p5)
K09B02M 2009 BM2 (Q=4.289 AU, arc=13 days, H=19.8 ~371m) from Lumijoki Obs. (Jan. 26.92p4), Hamamatsu-Yuto Obs. (Jan. 28.68-71p7), Stia Obs. (Jan. 30.77-79p3), and PJMSO (Jan. 31.36-37p7)
K09B00B 2009 BB (q=0.373 AU, Q=4.480 AU, arc=15 days, H=18.3 ~741m) from ARO (Jan. 31.05-06p3)
K09A16G 2009 AG16 (arc=16 days, H=21.2 ~195m) from ARO (Jan. 31.25-27p3)
K09A16F 2009 AF16 (arc=16 days, H=21.1 ~204m) from Castelmartini Obs. (Jan. 30.91-94p3) and PJMSO (Jan. 31.30p6)
K09A16D 2009 AD16 (Q=4.167 AU, arc=16 days, H=20.6 ~257m) from Balzaretto Obs. (Jan. 30.85-86p3)
K09A16C 2009 AC16 (arc=16 days, H=21.4 ~178m) from ARO (Jan. 31.01p3)
K09A00K 2009 AK (Q=4.215 AU, arc=30 days, H=19.7 ~389m) from SSS (Jan. 31.44p1)
K08Y30E 2008 YE30 (Q=4.098 AU, arc=40 days, H=21.2 ~195m) from SSS (Jan. 31.61-62p2)
K08Y27S 2008 YS27 (arc=33 days, H=21.2 ~195m) from Spacewatch 1.8m (Jan. 31.43p3)
K08Y27R 2008 YR27 (arc=55 days, H=18.1 ~812m) from LINEAR (Jan. 31.22-26p4)
K08Y26G 2008 YG26 (arc=33 days, H=21.7 ~155m) from ARO (Jan. 31.18-19p3)
K08Y03E 2008 YE3 (arc=40 days, H=20.9 ~224m) from ARO (Jan. 31.34-36p3)
K08X02Q 2008 XQ2 (arc=57 days, H=20.0 ~339m) from ARO (Jan. 31.28-30p3)
K08X02P 2008 XP2 (arc=57 days, H=18.5 ~676m) from ARO (Jan. 31.37p3)
K08X02O 2008 XO2 (arc=57 days, H=18.6 ~645m) from ARO (Jan. 31.02-05p3 at V=22.1-7)
K08X02E 2008 XE2 (arc=58 days, H=19.3 ~467m) from PJMSO (Jan. 31.37-38p6)
K08X00P 2008 XP (arc=61 days, H=21.4 ~178m) from ARO (Jan. 31.14-16p3)
K08W14C 2008 WC14 (Q=5.326 AU, arc=72 days, H=20.0 ~339m) from ARO (Jan. 31.40-41p3)
K08W02N 2008 WN2 (arc=99 days, H=20.8 ~234m) from ARO (Jan. 31.07-08p3)
K08U95C 2008 UC95 (arc=94 days, H=18.6 ~645m) from Walnut Creek Obs. (Jan. 31.30-32p3)
K08U00C 2008 UC (arc=104 days, H=18.9 ~562m) from LINEAR (Jan. 31.15-19p5)
K08S11V 2008 SV11 (Q=4.503 AU, arc=128 days, H=18.2 ~776m) from ARO (Jan. 31.02-03p3)
K08R98M 2008 RM98 (Q=4.198 AU, arc=146 days, H=20.3 ~295m) from ARO (Jan. 31.06p3)
K08Q03T 2008 QT3 (arc=159 days, H=18.8 ~589m) from Hamamatsu-Yuto Obs. (Jan. 28.45-49p6) and PJMSO (Jan. 31.22-23p6)
K08O09B 2008 OB9 (Q=5.652 AU, arc=2 opp, H=17.5 ~1.07 km) from ARO (Jan. 31.03-04p3)
K08E05V 2008 EV5 (arc=2 opp, H=20.0 ~339m) from Hamamatsu-Yuto Obs. (Jan. 28.50-54p8) and ARO (Jan. 31.10-12p2)
K06W02Z 2006 WZ2 (arc=3 opp, H=16.9 ~1.41 km) from Hamamatsu-Yuto Obs. (Jan. 28.72-76p10 & 31.80-83p3)
K06SL7Z 2006 SZ217 (arc=3 opp, H=17.4 ~1.12 km) from El Leoncito Obs. (Dec. 4.22-24p3)
K06A02S 2006 AS2 (arc=4 opp, H=20.4 ~282m) from Cegep de Trois-Rivieres Obs. (Jan. 28.04-05p10), Hamamatsu-Yuto Obs. (Jan. 28.61-65p10 & 31.69-72p11), Castelmartini Obs. (Jan. 30.94-95p4), LINEAR (Jan. 31.21-23p3), and PJMSO (Jan. 31.27p6)
K05W55S 2005 WS55 (arc=4 opp, H=16.0 ~2.14 km, q=1.108 AU) from CSS (Jan. 30.09-12p4)
K04E09U 2004 EU9 (arc=3 opp, H=18.7 ~616m) from SSS (Jan. 31.77p1)
K03X22B 2003 XB22 (arc=3 opp, H=19.3 ~467m) from PJMSO (Jan. 31.24-26p5)
K03R00B 2003 RB (arc=4 opp, H=18.7 ~616m) from the Spacewatch 0.9m telescope (Jan. 31.19-23p3)
K02V94Y 2002 VY94 (Q=5.375 AU, arc=2 opp, H=16.8 ~1.48 km) from Cyclops Obs. (Jan. 29.81-84p6)
K02JA9D 2002 JD109 (arc=4 opp, H=18.3 ~741m) from ARO (Jan. 31.14-18p2 at V=22.3)
K01D08V 2001 DV8 (arc=4 opp, H=20.6 ~257m) from PJMSO (Jan. 31.26p6)
K00GE7V 2000 GV147 (arc=3 opp, H=19.2 ~490m) from ARO (Jan. 31.32-37p3 at V=21.9-22.1)
K00B19L 2000 BL19 (Q=4.472 AU, arc=2 opp, H=19.9 ~355m) from Stia Obs. (Jan. 30.89-90p4) and PJMSO (Jan. 31.34-35p5)
J99C08W 1999 CW8 (arc=3 opp, H=18.6 ~645m) from PJMSO (Jan. 31.29-30p6)
J99A10Q 1999 AQ10 (arc=4 opp, H=20.3 ~295m) from LINEAR (Jan. 31.32-37p5)
J94A01W 1994 AW1 (arc=3 opp, H=17.6 ~1.02 km) from LINEAR (Jan. 31.09-14p10)
K3217 203217 2001 FX9 from MLS (Jan. 31.24-25p3)
I9973 189973 2003 XE11 from Desert Moon Obs. (Jan. 31.08-13p3)
G4202 164202 2004 EW from Spacewatch 0.9m (Jan. 31.53-55p3)
G3696 163696 2003 EB50 from MLS (Jan. 31.54-55p4)
G2004 162004 1991 VE from LINEAR (Jan. 31.09-14p4)
F3953 153953 2002 AD9 from CSS (Jan. 30.44-47p3)
F3306 153306 2001 JL1 from El Leoncito Obs. (Dec. 4.17-19p3)
E3651 143651 2003 QO104 from CSS (Jan. 29.45-47p4)
E2348 142348 2002 RX211 from LINEAR (Jan. 31.21-26p3)
E1052 141052 2001 XR1 from Vicksburg Obs. (Jan. 31.13p3)
D7925 137925 2000 BJ19 from LINEAR (Jan. 31.32-36p5)
B1253 111253 2001 XU10 from LINEAR (Jan. 31.27-32p5)
A1873 101873 1999 NC5 from Castelmartini Obs. (Jan. 30.90-91p4)
89355 89355 2001 VS78 from LINEAR (Jan. 31.20-25p5)
85938 85938 1999 DJ4 from CSS (Jan. 30.17-19p4)
85867 85867 1999 BY9 from MLS (Jan. 31.42-43p4)
68350 68350 2001 MK3 from CSS (Jan. 29.41-42p4)
52768 52768 1998 OR2 from CSS (Jan. 29.40-42p4 & 29.47-49p4)
39796 39796 1997 TD from MLS (Jan. 31.21-23p4)
36284 36284 2000 DM8 from CSS (Jan. 30.20-22p3)
35107 35107 1991 VH from El Leoncito Obs. (Dec. 4.26-27p3) and Vicksburg Obs. (Jan. 31.15-18p3)
22771 22771 1999 CU3 from MLS (Jan. 31.39-40p4)
20460 20460 Robwhiteley (1999 LO28) from LINEAR (Jan. 31.14-19p5)
10302 10302 1989 ML from LINEAR (Jan. 31.35-39p4)
08567 8567 1996 HW1 from CSS (Jan. 29.16-18p4)
07480 7480 Norwan (1994 PC) from LINEAR (Jan. 31.34-39p5)
07088 7088 Ishtar (1992 AA) from LINEAR (Jan. 31.47-50p4)
06050 6050 Miwablock (1992 AE) from LINEAR (Jan. 31.34-39p5)
05332 5332 Davidaguilar (1990 DA) from El Leoncito Obs. (Dec. 4.05-07p3)
04596 4596 1981 QB from SSS (Jan. 31.67-69p3)
04544 4544 Xanthus (1989 FB) from Deep Sky Obs. (Jan. 30.76-78p4)
04179 4179 Toutatis (1989 AC) from Hamamatsu-Yuto Obs. (Jan. 28.66-67p3 & 31.73-74p6)
03200 3200 Phaethon (1983 TB) from LINEAR (Jan. 31.08-13p8)
03122 3122 Florence (1981 ET3) from Spacewatch 0.9m (Jan. 31.47-50p3)
02368 2368 Beltrovata (1977 RA) from LINEAR (Jan. 31.21-25p4)
02061 2061 Anza (1960 UA) from MLS (Jan. 31.21-23p4)
01917 1917 Cuyo (1968 AA) from North Ryde Obs. (Dec. 21.54-56p2)
01863 1863 Antinous (1948 EA) from CSS (Jan. 29.30-32p4) and Purple Mtn. Obs. XuYi Station (XuYi Sta.) (Jan. 31.48-53p4)
01620 1620 Geographos (1951 RA) from Cyclops Obs. (Jan. 29.82-86p2)

MPEC 2009-C01 - "01:36 UT" - 2001 DR8

K01D08R 2001 DR8 (H=18.9 ~562m) from Spacewatch 0.9m (Jan. 31.41-45p3), Spacewatch 1.8m (Jan. 31.49-51p6), Calar Alto Obs. (Jan. 31.95p2), and Great Shefford Obs. (Jan. 31.99-00p3)

Observers on 1 February '09

A total of 28 observing facilities appear in today's MPECs.

Code	Observer / observatory
`H55`	Astronomical Research Obs. (ARO) in Illinois, 29 in MPEC 2009-C02 -- 2009 BW2, 2009 BU5, 2009 BQ5, 2009 BK58, 2009 BJ58, 2009 BH2, 2009 BH11, 2009 BG11, 2009 BD77, 2009 BB11, 2009 BB, 2009 AG16, 2009 AC16, 2008 YN27, 2008 YG26, 2008 YE3, 2008 YE29, 2008 XQ2, 2008 XP2, 2008 XP, 2008 XO2, 2008 WN2, 2008 WC14, 2008 SV11, 2008 RM98, 2008 OB9, 2008 EV5, 2002 JD109, 2000 GV147
`A81`	Balzaretto Obs. in Italy, 2 in MPEC 2009-C02 -- 2009 BD58, 2009 AD16
`493`	Calar Alto Obs. in Spain, 1 in MPEC 2009-C01 -- 2001 DR8
`160`	Castelmartini Obs. in Italy, 3 in MPEC 2009-C02 -- 2009 AF16, 2006 AS2, 101873
`703`	Catalina Sky Survey (CSS) in Arizona, 10 in MPEC 2009-C02 -- 2009 BK58, 2005 WS55, 85938, 68350, 52768, 36284, 153953, 143651, 8567, 1863
`924`	Cegep de Trois-Rivieres Obs. in Quebec, 1 in MPEC 2009-C02 -- 2006 AS2
`B84`	Cyclops Obs. in The Netherlands, 2 in MPEC 2009-C02 -- 2002 VY94, 1620
`B60`	Deep Sky Obs. in Germany, 1 in MPEC 2009-C02 -- 4544
`448`	Desert Moon Obs. in New Mexico, 2 in MPEC 2009-C02 -- 2008 YG3, 189973
`808`	El Leoncito Obs. in Argentina, 4 in MPEC 2009-C02 -- 2006 SZ217, 35107, 153306, 5332
`J95`	Great Shefford Obs. in England, 3 in MPECs 2009-C01 & 2009-C02 -- 2009 BK58, 2009 BJ58, 2001 DR8
`379`	Hamamatsu-Yuto Obs. in Japan, 6 in MPEC 2009-C02 -- 2009 BM2, 2008 QT3, 2008 EV5, 2006 WZ2, 2006 AS2, 4179
`185`	Jurassien-Vicques Obs. in Switzerland, 1 in MPEC 2009-C02 -- 2009 BK71
`704`	LINEAR in New Mexico, 19 in MPEC 2009-C02 -- 2009 BT5, 2009 BM58, 2008 YR27, 2008 UC, 2006 AS2, 1999 AQ10, 1994 AW1, 89355, 20460, 162004, 142348, 137925, 111253, 10302, 7480, 7088, 6050, 3200, 2368
`A70`	Lumijoki Obs. in Finland, 1 in MPEC 2009-C02 -- 2009 BM2
`474`	Mt. John Obs. in New Zealand, 1 in MPEC 2009-C02 -- 2009 BK58
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 11 in MPEC 2009-C02 -- 2009 BT5, 2009 BM58, 2009 BG58, 2009 BE58, 2009 BD77, 85867, 39796, 22771, 203217, 163696, 2061
`A24`	New Millennium Obs. in Italy, 1 in MPEC 2009-C02 -- 2009 BO58
`423`	North Ryde Obs. in New South Wales, 1 in MPEC 2009-C02 -- 1917
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 10 in MPEC 2009-C02 -- 2009 BM2, 2009 BD58, 2009 AF16, 2008 XE2, 2008 QT3, 2006 AS2, 2003 XB22, 2001 DV8, 2000 BL19, 1999 CW8
`D29`	Purple Mtn. Obs. XuYi Station in China, 1 in MPEC 2009-C02 -- 1863
`E12`	Siding Spring Survey (SSS) in New South Wales, 6 in MPEC 2009-C02 -- 2009 BH58, 2009 BG11, 2009 AK, 2008 YE30, 2004 EU9, 4596
`587`	Sormano Obs. in Italy, 3 in MPEC 2009-C02 -- 2009 BG58, 2009 BF58, 2009 BD58
`691`	Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2009-C01 & 2009-C02 -- 2003 RB, 2001 DR8, 164202, 3122
`291`	Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2009-C01 & 2009-C02 -- 2009 BS5, 2009 BR5, 2009 BH11, 2009 BF58, 2009 BE2, 2009 BC58, 2008 YU30, 2008 YS27, 2008 YG29, 2001 DR8
`A78`	Stia Obs. in Italy, 4 in MPEC 2009-C02 -- 2009 BT5, 2009 BM2, 2008 YE29, 2000 BL19
`H47`	Vicksburg Obs. in Mississippi, 2 in MPEC 2009-C02 -- 35107, 141052
`G56`	Walnut Creek Obs. in northern California, 2 in MPEC 2009-C02 -- 2008 YE29, 2008 UC95

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

Impact Risk Monitoring on 1 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 BJ58	JPL Sentry	1528	2016-2101	54	1.4e-07	-3.17	-3.52	0	JPL: "Analysis based on 42 observations spanning 2.6794 days (2009-Jan-29.13966 to 2009-Jan-31.81908)." Diameter approximately 0.520 km. from mean, weighted H=19.1.
2009 BJ58	NEODyS	1528	2016-2085	44	1.57e-07	-3.30	-3.87	0	NEODyS: "Based on 42 optical observations (of which 0 are rejected as outliers) from 2009/01/29.140 to 2009/01/31.820."

2009 BF58	JPL Sentry	1528	2055-2109	62	3.3e-04	-4.94	-5.36	0	JPL: "Analysis based on 38 observations spanning 3.9463 days (2009-Jan-28.26267 to 2009-Feb-01.20893)." Diameter approximately 0.012 km. from mean, weighted H=27.3.
2009 BF58	NEODyS	1528	2055-2090	30	2.09e-04	-5.08	-5.38	0	NEODyS: "Based on 38 optical observations (of which 0 are rejected as outliers) from 2009/01/28.263 to 2009/02/01.210."

2009 BC58	JPL Sentry	1528	R E M O V E D						JPL: Risk listing removed at 1028 UTC.
2009 BC58	NEODyS	1528	R E M O V E D						-

2009 BR5	JPL Sentry	1528	2059-2078	3	3.1e-07	-5.00	-5.24	0	JPL: "Analysis based on 34 observations spanning 10.855 days (2009-Jan-20.45513 to 2009-Jan-31.3098)." Diameter approximately 0.130 km. from mean, weighted H=22.1.
2009 BR5	NEODyS	1528	2059-2078	3	3.31e-07	-4.97	-5.17	0	NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2009/01/20.456 to 2009/01/31.311."

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 1 February '09

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

1528

Noted that JPL Sentry has removed 2009 BC58 as an impact risk - see above
Noted that NEODyS has removed 2009 BC58 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 BF58 risk assessment - see above
Noted that NEODyS has updated its 2009 BF58 risk assessment - see above
Noted that JPL Sentry has updated its 2009 BJ58 risk assessment - see above
Noted that NEODyS has updated its 2009 BJ58 risk assessment - see above
Noted that JPL Sentry has updated its 2009 BR5 risk assessment - see above
Noted that NEODyS has updated its 2009 BR5 risk assessment - see above
Grabbed MPEC 2009-C02 - Daily Orbit Update - see above

0516

Grabbed MPEC 2009-C01 - 2001 DR8 - see above

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