2009-11-19 Tracking News

Contents on 19 November '09

IAU Minor Planet Center
- NEOCP Activity -- seven listings: 7 updated
- New MPECs -- sixteen MPECs
Observers -- 31 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
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 November '09

The MPC's NEO Confirmation Page has 7 listings: 7 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seven updated listings. Of these, six were "one nighters." The Tracking News counted a total of 23 listings on the NEOCP at some point on this day.

New MPECs on 19 November '09

Minor Planet Electronic Circulars

There were sixteen MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2009-W31 time-stamped "07:10 UT" - Daily Orbit Update - see below
MPEC 2009-W32 time-stamped "12:58 UT" - 2007 WB - see below
MPEC 2009-W33 time-stamped "14:14 UT" - 2009 WJ6 - see below
MPEC 2009-W34 time-stamped "17:39 UT" - Comet C/2009 W1 (Hill) - see below
MPEC 2009-W35 time-stamped "17:57 UT" - 2009 WK6 - see below
MPEC 2009-W36 time-stamped "18:02 UT" - 2009 WL6 - see below
MPEC 2009-W37 time-stamped "18:06 UT" - 2009 WM6 - see below
MPEC 2009-W38 time-stamped "18:09 UT" - 2009 WN6 - see below
MPEC 2009-W39 time-stamped "18:14 UT" - 2009 WO6 - see below
MPEC 2009-W40 time-stamped "18:32 UT" - 2009 WP6 - see below
MPEC 2009-W41 time-stamped "18:36 UT" - 2009 WQ6 - see below
MPEC 2009-W42 time-stamped "18:40 UT" - 2009 WR6 - see below
MPEC 2009-W43 time-stamped "21:40 UT" - 2009 WX6 - see below
MPEC 2009-W44 time-stamped "23:18 UT" - 2009 WD7 - see below
MPEC 2009-W45 time-stamped "23:50 UT" - 2009 WF7 - see below
MPEC 2009-W46 time-stamped "23:57 UT" - 2009 WG7

MPEC 2009-W46 - "23:57 UT" - 2009 WG7

K09W07G 2009 WG7 (small asteroid, Earth MOID=7.5 LD, H=26.6 ~16m) was discovered at 0705 UT on 19 Nov. by the Mt. Lemmon Survey (MLS), which observed it at Nov. 19.30-35p8 and 19.40-41p4. The discovery was confirmed by Tenagra II Obs. (Nov. 19.44-45p2) and Gaisberg Obs. (Nov. 19.94-96p3).

MPEC 2009-W45 - "23:50 UT" - 2009 WF7

K09W07F 2009 WF7 (H=18.4 ~708m) was discovered at 0748 UT on 19 Nov. by MLS, which observed it at Nov. 19.33-34p4 and 19.40-41p4. The discovery was confirmed by Tenagra II Obs. (Nov. 19.46p3) and Bergen-Enkheim Obs. (Nov. 19.89-92p3).

MPEC 2009-W44 - "23:18 UT" - 2009 WD7

K09W07D 2009 WD7 (small asteroid, Earth MOID=6.9 LD, H=25.6 ~26m) was discovered at 0854 UT on 19 Nov. by MLS, which observed it at Nov. 19.37-43p12 at V=20.4-22.1. The discovery was confirmed by Gaisberg Obs. (Nov. 19.92-93p3).

MPEC 2009-W43 - "21:40 UT" - 2009 WX6

K09W06X 2009 WX6 (small asteroid, Earth MOID=5.3 LD, H=23.7 ~62m) was discovered at 0756 UT on 19 Nov. by the Catalina Sky Survey (CSS), which observed it at Nov. 19.33-37p7. The discovery was confirmed by Moriyama Obs. (Nov. 19.49p2), Castelmartini Obs. (Nov. 19.77-78p7), and Inastars Obs. (Nov. 19.81-83p5).

MPEC 2009-W42 - "18:40 UT" - 2009 WR6

K09W06R 2009 WR6 (risk-listed, H=18.2 ~776m) was discovered at 1208 UT on 18 Nov. by CSS, which observed it at Nov. 18.51-53p7 and 19.42-44p8. The discovery was confirmed by Magdalena Ridge Obs. (MRO) (Nov. 18.53-54p3), Terskol Obs. (Nov. 19.07-09p3), and Sandlot Obs. (Nov. 19.45-46p3).

MPEC 2009-W41 - "18:36 UT" - 2009 WQ6

K09W06Q 2009 WQ6 (small asteroid, Earth MOID=0.9 LD, H=29.2 ~5m) was discovered at 0607 UT on 18 Nov. by MLS, which observed it at Nov. 18.25-27p4 at V=20.0-21.4, 18.32-35p4 at V=20.2-21.6, 19.16-17p6 at V=20.9-22.2, and 19.28p2 at V=21.9-22.5. The discovery was confirmed by MRO (Nov. 18.38-39p4). This object is now within ten lunar distances (LD) of Earth, reaching 1.1 LD on 17 Nov.

MPEC 2009-W40 - "18:32 UT" - 2009 WP6

K09W06P 2009 WP6 (risk-listed, q=0.296 AU, Earth MOID=0.4 LD, H=26.8 ~15m) was discovered at 0603 UT on 18 Nov. by MLS, which observed it at Nov. 18.25-27p4 and 18.32-35p4. The discovery was confirmed by MRO (Nov. 18.35-37p4) and the Spacewatch 1.8m telescope (Nov. 19.17-18p3). This object was within ten lunar distances (LD) of Earth, reaching 0.7 LD on 15 Nov. (INTRUDER).

MPEC 2009-W39 - "18:14 UT" - 2009 WO6

K09W06O 2009 WO6 (Q=4.891 AU, H=17.2 ~1.23 km) was discovered at 0548 UT on 18 Nov. by CSS, which observed it at Nov. 18.24-26p4 and 19.24-25p4. The discovery was confirmed by the Siding Spring Survey (SSS) (Oct. 18.62-64p2), Mt. John Obs. (Nov. 18.44p3), Tenagra II Obs. (Nov. 19.25p3), Sabino Canyon Obs. (Nov. 19.26p3), and Sierra Stars Obs. (Nov. 19.26-28p3).

MPEC 2009-W38 - "18:09 UT" - 2009 WN6

K09W06N 2009 WN6 (small asteroid, Earth MOID=1.6 LD, H=24.6 ~41m) was discovered at 0522 UT on 18 Nov. by MLS, which observed it at Nov. 18.22-30p8 and 19.18p3. The discovery was confirmed by MRO (Nov. 18.33-34p4 & 19.29-31p4), Spacewatch 1.8m (Nov. 19.16-17p3), and Tenagra II Obs. (Nov. 19.17-18p3).

MPEC 2009-W37 - "18:06 UT" - 2009 WM6

K09W06M 2009 WM6 (small asteroid, H=23.8 ~59m) was discovered at 0412 UT on 18 Nov. by MLS, which observed it at Nov. 18.18-20p4 and 19.17-18p4. The discovery was confirmed by MRO (Nov. 18.23-24p5 & 19.21-23p4), Spacewatch 1.8m (Nov. 19.14-15p3), and Tenagra II Obs. (Nov. 19.21p2).

MPEC 2009-W36 - "18:02 UT" - 2009 WL6

K09W06L 2009 WL6 (H=20.3 ~295m) was discovered at 0221 UT on 18 Nov. by MLS, which observed it at Nov. 18.10-17p8 at V=20.8-22.1 and 19.13p2 at V=21.3-22.0. The discovery was confirmed by MRO (Nov. 18.14-16p5 & 19.19-20p4), Tenagra II Obs. (Nov. 19.08-09p3), and Spacewatch 1.8m (Nov. 19.11-12p3).

MPEC 2009-W35 - "17:57 UT" - 2009 WK6

K09W06K 2009 WK6 (H=19.2 ~490m) was discovered at 1016 UT on 17 Nov. by MLS, which observed it at Nov. 17.43-45p4 and 17.49-51p4. The discovery was confirmed by MRO (Nov. 17.48-50p5 & 18.44-47p4), Tenagra II Obs. (Nov. 18.49-50p3), Spacewatch 1.8m (Nov. 19.36-37p3), and Sandlot Obs. (Nov. 19.38-40p3).

MPEC 2009-W34 - "17:39 UT" - Comet C/2009 W1 (Hill)

CK09W010 C/2009 W1 from CSS (Nov. 18.51-52p4 & 19.42-44p8), Engelhardt Obs. Zelenchukskaya Station (Nov. 19.03-05p5), Terskol Obs. (Nov. 19.09-10p3), Zvezdno Obshtestvo Obs. (Nov. 19.10-17p4), Sandlot Obs. (Nov. 19.47-48p3), and MLS (Nov. 19.50-51p4)

MPEC 2009-W33 - "14:14 UT" - 2009 WJ6

K09W06J 2009 WJ6 (risk-listed, Earth MOID=0.4 LD, H=27.5 ~11m) was discovered at 0623 UT on 19 Nov. by CSS, which observed it at Nov. 19.27-29p3 and 19.36p4. The discovery was confirmed by MRO (Nov. 19.33p2), Sabino Canyon Obs. (Nov. 19.33-34p3), Sandlot Obs. (Nov. 19.36-37p5), MLS (Nov. 19.43p4), Tenagra II Obs. (Nov. 19.45p3), and Moriyama Obs. (Nov. 19.56-57p4). This object is now within ten lunar distances (LD) of Earth, reaching 0.5 LD on 20 Nov. (INTRUDER).

MPEC 2009-W32 - "12:58 UT" - 2007 WB

K07W00B 2007 WB (H=18.8 ~589m) from SSS (Nov. 18.45-46p2 & 19.43-44p2)

<< DOU on 19 Nov. '09 >> MPEC 2009-W31 - "07:10 UT" - Daily Orbit Update

Observations of risk-listed objects
K09W01J 2009 WJ1 (arc=2 days, H=21.3 ~186m) from Spacewatch 1.8m (Nov. 19.13-14p3)
K09V26A 2009 VA26 (i=38.4°, arc=8 days, H=20.9 ~224m) from Spacewatch 1.8m (Nov. 19.18-19p3)
Observations of recently (no longer) risk-listed objects
K09W00B 2009 WB (small asteroid, arc=2 days, H=24.1 ~51m) from MRO (Nov. 18.32-33p4)
K09V24O 2009 VO24 (arc=7 days, H=19.7 ~389m) from Desert Moon Obs. (Nov. 18.19-22p3)
Observations of small asteroids (H>22.0)
K09W00E 2009 WE (arc=2 days, H=22.3 ~117m) from MRO (Nov. 17.22-23p4) and MLS (Nov. 18.25-27p4)
K09W00C 2009 WC (arc=2 days, H=27.7 ~10m) from Tenagra II Obs. (Nov. 18.17p1 & 18.43-44p3)
K09V01C 2009 VC1 (arc=9 days, H=27.0 ~13m) from Tenagra II Obs. (Nov. 18.53p4)
K09T10F 2009 TF10 (arc=34 days, H=22.1 ~129m) from CSS (Nov. 18.18-21p4)
Observations of other objects
K09W01L 2009 WL1 (arc=1 day, H=18.2 ~776m) from Jarnac Obs. (Nov. 18.30-33p3) and LINEAR (Nov. 18.44-49p4)
K09W00A 2009 WA (arc=3 days, H=21.2 ~195m) from Tenagra II Obs. (Nov. 19.11-12p3)
K09V01A 2009 VA1 (Q=4.343 AU, arc=13 days, H=18.5 ~676m) from Alter Satzberg Obs. (Nov. 18.75-78p3)
K09V00Z 2009 VZ (arc=10 days, H=21.3 ~186m) from Schiaparelli Obs. (Nov. 10.02p5) and Tenagra II Obs. (Nov. 18.42p2)
K09V00W 2009 VW (arc=10 days, H=21.6 ~162m) from McCarthy Obs. (Nov. 19.22-23p3)
K09U19E 2009 UE19 (Q=4.052 AU, arc=26 days, H=20.4 ~282m) from Mirasteilas Obs. (Nov. 19.07-08p3)
K09U05P 2009 UP5 (arc=29 days, H=19.2 ~490m) from Desert Moon Obs. (Nov. 18.10-15p3)
K09T10M 2009 TM10 (arc=60 days, H=19.4 ~446m) from CSS (Nov. 18.18-21p4)
K09R00N 2009 RN (Q=4.583 AU, arc=68 days, H=19.9 ~355m) from Goodricke-Pigott Obs. (Nov. 18.36-38p3)
K09O03B 2009 OB3 (arc=119 days, H=18.9 ~562m) from SSS (Nov. 18.58-59p2)
K09H21D 2009 HD21 (Q=4.673 AU, arc=2 opp, H=18.2 ~776m) from SSS (Nov. 18.53p1)
K09H00B 2009 HB (arc=2 opp, H=18.0 ~851m) from MLS (Nov. 18.07-09p4)
K07VI6H 2007 VH186 (arc=2 opp, H=20.2 ~309m) from LINEAR (Nov. 18.21-25p4)
K07U03R 2007 UR3 (arc=3 opp, H=21.3 ~186m) from the Spacewatch 0.9m telescope (Nov. 18.31-35p3) and Mirasteilas Obs. (Nov. 19.01-02p3)
K06W01N 2006 WN1 (arc=2 opp, H=18.8 ~589m) from Mirasteilas Obs. (Nov. 18.96-98p3)
K05S19G 2005 SG19 (Q=4.170 AU, arc=2 opp, H=16.6 ~1.62 km) from MLS (Nov. 18.12-14p4)
K05R06Q 2005 RQ6 (arc=2 opp, H=18.8 ~589m) from Hamamatsu-Yuto Obs. (Nov. 15.52p2, 18.47-48p4 & 18.52p1) and Atlante Obs. (Nov. 18.93-94p3)
K02X90M 2002 XM90 (arc=4 opp, H=17.9 ~891m) from CSS (Nov. 18.28-31p4)
K02W00P 2002 WP (arc=3 opp, H=18.3 ~741m) from CSS (Nov. 18.31-34p4)
K00B28O 2000 BO28 (arc=4 opp, H=19.9 ~355m) from Spacewatch 1.8m (Nov. 19.23p3)
J85W00A 1985 WA (Q=4.556 AU, arc=3 opp, H=18.1 ~812m) from CSS (Nov. 18.48-50p3)
M4926 224926 2007 DA41 from MLS (Nov. 18.28-30p4)
M2073 222073 1999 HY1 from CSS (Nov. 18.21-24p4)
L7683 217683 1999 RP36 from LINEAR (Nov. 18.26-30p5)
L5188 215188 2000 NM from LINEAR (Nov. 18.39-41p3)
I5716 185716 1998 SF35 from CSS (Nov. 18.22-23p3)
F4244 154244 2002 KL6 from LINEAR (Nov. 18.20-25p5)
E3404 143404 2003 BD44 from Spacewatch 0.9m (Nov. 18.15-18p3)
D8852 138852 2000 WN10 from LINEAR (Nov. 18.25-30p10)
89136 89136 2001 US16 from Spacewatch 0.9m (Nov. 18.14-18p2)
85818 85818 1998 XM4 from Desert Moon Obs. (Nov. 18.38-39p5)
85709 85709 1998 SG36 from CSS (Nov. 18.44-46p4)
38091 38091 1999 JT3 from LINEAR (Nov. 18.20-25p5)
16816 16816 1997 UF9 from LINEAR (Nov. 18.19-24p5)
08035 8035 1992 TB from MLS (Nov. 18.07-09p4)
05626 5626 1991 FE from LINEAR (Nov. 18.07-12p5)
05131 5131 1990 BG from LINEAR (Nov. 18.44-49p5)
04015 4015 Wilson-Harrington (1979 VA) from La Vara Obs. (Nov. 17.84p3 & 18.83p3) and Nazaret Obs. (Nov. 18.84-85p4)

Observers on 19 November '09

A total of 31 observing facilities appeared in this day's MPECs.

Code	Observer / observatory
`B03`	Alter Satzberg Obs. in Austria, 1 in MPEC 2009-W31 -- 2009 VA1
`J51`	Atlante Obs. in the Canary Islands, 1 in MPEC 2009-W31 -- 2005 RQ6
`A74`	Bergen-Enkheim Obs. in Germany, 1 in MPEC 2009-W45 -- 2009 WF7
`160`	Castelmartini Obs. in Italy, 1 in MPEC 2009-W43 -- 2009 WX6
`703`	Catalina Sky Survey (CSS) in Arizona, 13 in MPECs 2009-W31, 2009-W33, 2009-W34, 2009-W39, 2009-W42 & 2009-W43 -- 2009 WX6, 2009 WR6, 2009 WO6, 2009 WJ6, C/2009 W1, 2009 TM10, 2009 TF10, 2002 XM90, 2002 WP, 1985 WA, 85709, 222073, 185716
`448`	Desert Moon Obs. in New Mexico, 3 in MPEC 2009-W31 -- 2009 VO24, 2009 UP5, 85818
`114`	Engelhardt Obs. Zelenchukskaya Station in Karachay-Cherkessia, 1 in MPEC 2009-W34 -- C/2009 W1
`B21`	Gaisberg Obs. in Austria, 2 in MPECs 2009-W44 & 2009-W46 -- 2009 WG7, 2009 WD7
`683`	Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2009-W31 -- 2009 RN
`379`	Hamamatsu-Yuto Obs. in Japan, 1 in MPEC 2009-W31 -- 2005 RQ6
`B15`	Inastars Obs. in Germany, 1 in MPEC 2009-W43 -- 2009 WX6
`G92`	Jarnac Obs. in Arizona, 1 in MPEC 2009-W31 -- 2009 WL1
`704`	LINEAR in New Mexico, 10 in MPEC 2009-W31 -- 2009 WL1, 2007 VH186, 38091, 217683, 215188, 16816, 154244, 138852, 5626, 5131
`J38`	La Vara Obs. in Spain, 1 in MPEC 2009-W31 -- 4015
`H01`	Magdalena Ridge Obs. (MRO) in New Mexico, 10 in MPECs 2009-W31, 2009-W33, 2009-W35, 2009-W36, 2009-W37, 2009-W38, 2009-W40, 2009-W41 & 2009-W42 -- 2009 WR6, 2009 WQ6, 2009 WP6, 2009 WN6, 2009 WM6, 2009 WL6, 2009 WK6, 2009 WJ6, 2009 WE, 2009 WB
`932`	McCarthy Obs. in Connecticut, 1 in MPEC 2009-W31 -- 2009 VW
`B67`	Mirasteilas Obs. in Switzerland, 3 in MPEC 2009-W31 -- 2009 UE19, 2007 UR3, 2006 WN1
`900`	Moriyama Obs. in Japan, 2 in MPECs 2009-W33 & 2009-W43 -- 2009 WX6, 2009 WJ6
`474`	Mt. John Obs. in New Zealand, 1 in MPEC 2009-W39 -- 2009 WO6
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 16 in MPECs 2009-W31, 2009-W33, 2009-W34, 2009-W35, 2009-W36, 2009-W37, 2009-W38, 2009-W40, 2009-W41, 2009-W44, 2009-W45 & 2009-W46 -- 2009 WQ6, 2009 WP6, 2009 WN6, 2009 WM6, 2009 WL6, 2009 WK6, 2009 WJ6, 2009 WG7, 2009 WF7, 2009 WE, 2009 WD7, C/2009 W1, 2009 HB, 2005 SG19, 224926, 8035
`J47`	Nazaret Obs. in Spain, 1 in MPEC 2009-W31 -- 4015
`854`	Sabino Canyon Obs. in Arizona, 2 in MPECs 2009-W33 & 2009-W39 -- 2009 WO6, 2009 WJ6
`H36`	Sandlot Obs. in Kansas, 4 in MPECs 2009-W33, 2009-W34, 2009-W35 & 2009-W42 -- 2009 WR6, 2009 WK6, 2009 WJ6, C/2009 W1
`204`	Schiaparelli Obs. in Italy, 1 in MPEC 2009-W31 -- 2009 VZ
`E12`	Siding Spring Survey (SSS) in New South Wales, 4 in MPECs 2009-W31, 2009-W32 & 2009-W39 -- 2009 WO6, 2009 OB3, 2009 HD21, 2007 WB
`G68`	Sierra Stars Obs. in northern California, 1 in MPEC 2009-W39 -- 2009 WO6
`691`	Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2009-W31 -- 2007 UR3, 89136, 143404
`291`	Spacewatch 1.8m telescope in Arizona, 8 in MPECs 2009-W31, 2009-W35, 2009-W36, 2009-W37, 2009-W38 & 2009-W40 -- 2009 WP6, 2009 WN6, 2009 WM6, 2009 WL6, 2009 WK6, 2009 WJ1, 2009 VA26, 2000 BO28
`926`	Tenagra II Obs. in Arizona, 12 in MPECs 2009-W31, 2009-W33, 2009-W35, 2009-W36, 2009-W37, 2009-W38, 2009-W39, 2009-W45 & 2009-W46 -- 2009 WO6, 2009 WN6, 2009 WM6, 2009 WL6, 2009 WK6, 2009 WJ6, 2009 WG7, 2009 WF7, 2009 WC, 2009 WA, 2009 VZ, 2009 VC1
`B18`	Terskol Obs. in Russia, 2 in MPECs 2009-W34 & 2009-W42 -- 2009 WR6, C/2009 W1
`A79`	Zvezdno Obshtestvo Obs. in Bulgaria, 1 in MPEC 2009-W34 -- C/2009 W1

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

Impact Risk Monitoring on 19 November '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 WR6	JPL Sentry	2232	2021-2082	8	2.2e-09	-5.20	-5.68	0	JPL: "Analysis based on 24 observations spanning .95718 days (2009-Nov-18.50609 to 2009-Nov-19.46327)." Diameter approximately 0.690 km. from mean, weighted H=18.5.

2009 WP6	JPL Sentry	2232	2055-2109	119	4.9e-05	-4.95	-5.62	0	JPL: "Analysis based on 15 observations spanning .92628 days (2009-Nov-18.25267 to 2009-Nov-19.17895)." Diameter approximately 0.015 km. from mean, weighted H=26.8.

2009 WJ6	JPL Sentry	1600	2042-2056	4	7.8e-05	-4.98	-5.21	0	JPL: "Analysis based on 28 observations spanning .30011 days (2009-Nov-19.26657 to 2009-Nov-19.56668)." Diameter approximately 0.011 km. from mean, weighted H=27.5.

2009 WM1	NEODyS	1508	2013-2090	84	1.09e-05	-2.30	-2.98	0	NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2009/11/17.465 to 2009/11/18.506."

2009 WJ1	JPL Sentry	1508	2061-2103	8	1.1e-08	-6.20	-6.65	0	JPL: "Analysis based on 25 observations spanning 2.0310 days (2009-Nov-17.10881 to 2009-Nov-19.13986)." Diameter approximately 0.208 km. from mean, weighted H=21.1.
2009 WJ1	NEODyS	1508	2057	1	3.43e-10	-7.39	-7.39	0	NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2009/11/17.110 to 2009/11/19.141."

2009 VA26	JPL Sentry	1508	2017-2107	7	1.3e-08	-5.62	-6.00	0	JPL: "Analysis based on 37 observations spanning 7.8103 days (2009-Nov-11.38063 to 2009-Nov-19.19089)." Diameter approximately 0.210 km. from mean, weighted H=21.1.
2009 VA26	NEODyS	1508	2017-2086	14	1.72e-08	-5.52	-5.91	0	NEODyS: "Based on 37 optical observations (of which 0 are rejected as outliers) from 2009/11/11.381 to 2009/11/19.192."

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 November '09

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

0027 11/20	Grabbed MPEC 2009-W46 - 2009 WG7 - see above
2358	Grabbed MPEC 2009-W44 - 2009 WD7 - see above Grabbed MPEC 2009-W45 - 2009 WF7 - see above
2232	Noted that JPL Sentry has posted 2009 WP6 as an impact risk - see above Noted that JPL Sentry has posted 2009 WR6 as an impact risk - see above Grabbed MPEC 2009-W43 - 2009 WX6 - see above
1926	Grabbed MPEC 2009-W40 - 2009 WP6 - see above Grabbed MPEC 2009-W41 - 2009 WQ6 - see above Grabbed MPEC 2009-W42 - 2009 WR6 - see above
1827	Grabbed MPEC 2009-W34 - Comet C/2009 W1 (Hill) - see above Grabbed MPEC 2009-W35 - 2009 WK6 - see above Grabbed MPEC 2009-W36 - 2009 WL6 - see above Grabbed MPEC 2009-W37 - 2009 WM6 - see above Grabbed MPEC 2009-W38 - 2009 WN6 - see above Grabbed MPEC 2009-W39 - 2009 WO6 - see above
1600	Noted that JPL Sentry has posted 2009 WJ6 as an impact risk - see above
1508	Noted that JPL Sentry has updated its 2009 VA26 risk assessment - see above Noted that NEODyS has reposted 2009 VA26 as an impact risk - see above Noted that JPL Sentry has updated its 2009 WJ1 risk assessment - see above Noted that NEODyS has posted 2009 WJ1 as an impact risk - see above Noted that NEODyS has posted 2009 WM1 as an impact risk - see above Grabbed MPEC 2009-W31 - Daily Orbit Update - see above Grabbed MPEC 2009-W32 - 2007 WB - see above Grabbed MPEC 2009-W33 - 2009 WJ6 - see above

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