2009-12-21 Tracking News

Contents on 21 December '09

IAU Minor Planet Center
- NEOCP Activity -- none
- New MPECs -- seven MPECs
Observers -- eighteen observing facilities
Impact Risk Monitoring -- five 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 21 December '09

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty. There were six listings noted earlier today.

New MPECs on 21 December '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-Y34 time-stamped "07:16 UT" - Daily Orbit Update - see below
MPEC 2009-Y35 time-stamped "15:03 UT" - 2009 YS6 - see below
MPEC 2009-Y36 time-stamped "15:07 UT" - 2009 YT6 - see below
MPEC 2009-Y37 time-stamped "15:11 UT" - 2009 YU6 - see below
MPEC 2009-Y38 time-stamped "15:19 UT" - 2009 YV6 - see below
MPEC 2009-Y39 time-stamped "16:51 UT" - 2006 WS195 - see below
MPEC 2009-Y40 time-stamped "19:06 UT" - Comet C/2009 Y2 (Kowalski)

MPEC 2009-Y40 - "19:06 UT" - Comet C/2009 Y2 (Kowalski)

CK09Y020 C/2009 Y2 (Kowalski) (i=30.7°, q=2.291 AU, TP=2010 Apr. 2.849 TT) from the Catalina Sky Survey (CSS) (Dec. 20.12-17p8), Magdalena Ridge Obs. (MRO) (Dec. 20.18-21p5 & 21.06-08p4), the Mt. Lemmon Survey (MLS) (Dec. 20.20-21p8), Moriyama Obs. (Dec. 20.42-44p3), Bisei Spaceguard Center (Dec. 20.42-46p4), Great Shefford Obs. (Dec. 20.78-81p3 & 20.86-89p4), and New Millennium Obs. (Dec. 20.81-83p6)

MPEC 2009-Y39 - "16:51 UT" - 2006 WS195

K06WJ5S 2006 WS195 (KBO, q=30.055 AU, Q=49.246 AU, H=8.2 ~77.6 km) from Mauna Kea (2004 Sept. 12.57p1 at V=23.8, 2004 Sept. 12.62p1, 2004 Sept. 13.54-57p2 & 2004 Sept. 14.54-57p2)

MPEC 2009-Y38 - "15:19 UT" - 2009 YV6

K09Y06V 2009 YV6 (risk-listed, H=21.4 ~178m) was discovered at 0911 UT on 20 Dec. by MLS, which observed it at Dec. 20.38-47p9. The discovery was confirmed by Great Shefford Obs. (Dec. 20.95-97p2).

MPEC 2009-Y37 - "15:11 UT" - 2009 YU6

K09Y06U 2009 YU6 (H=21.5 ~170m) was discovered at 0828 UT on 20 Dec. by MLS, which observed it at Dec. 20.35-41p8 and 20.51p4. The discovery was confirmed by MRO (Dec. 20.44-46p3 & 21.53-55p4), Great Shefford Obs. (Dec. 21.00-01p2), and Sandlot Obs. (Dec. 21.44-47p3).

MPEC 2009-Y36 - "15:07 UT" - 2009 YT6

K09Y06T 2009 YT6 (H=20.7 ~245m) was discovered at 0351 UT on 19 Dec. by MLS, which observed it at Dec. 19.16-18p3 at V=22.1-4 and 19.22-23p3 at V=21.3. The discovery was confirmed by MRO (Dec. 19.29-31p3, 20.06-08p3 & 21.09-10p3), the Spacewatch 1.8m telescope (Dec. 20.17p3), and Great Shefford Obs. (Dec. 20.84p1 & 20.92p1).

MPEC 2009-Y35 - "15:03 UT" - 2009 YS6

K09Y06S 2009 YS6 (i=144.1°, Q=9.325 AU, H=14.3 ~4.67 km, q=1.268 AU) was discovered at 0925 UT on 17 Dec. by MLS, which observed it at Dec. 17.39-41p4 at V=21.0-22.3 and 19.49-50p4 at V=20.8-21.2. The discovery was confirmed by MRO (Dec. 17.54-55p3, 18.26-30p5, 19.48-50p4, 20.37-41p4 & 21.53-55p4), Spacewatch 1.8m (Dec. 20.32-33p3), and Sandlot Obs. (Dec. 21.35p1 & 21.41-43p2).

<< DOU on 21 Dec. '09 >> MPEC 2009-Y34 - "07:16 UT" - Daily Orbit Update

Observations of risk-listed objects
K09Y00Q 2009 YQ (arc=2 days, H=20.7 ~245m) from Spacewatch 1.8m (Dec. 20.33-34p3)
K09Y00G 2009 YG (Q=4.047 AU, arc=3 days, H=18.1 ~812m) from Schiaparelli Obs. (Dec. 20.23-24p2) and Spacewatch 1.8m (Dec. 20.44-45p3)
K09X06T 2009 XT6 (arc=7 days, H=20.2 ~309m) from Schiaparelli Obs. (Dec. 15.02-04p3), Bergen-Enkheim Obs. (Dec. 20.00-08p4), and Spacewatch 1.8m (Dec. 20.30p3)
K09X00O 2009 XO (arc=11 days, H=20.1 ~323m) from Spacewatch 1.8m (Dec. 20.31-32p3)
Observations of recently (no longer) risk-listed objects
K09X02F 2009 XF2 (arc=8 days, H=20.0 ~339m) from Schiaparelli Obs. (Dec. 14.99p1 & 15.04-05p2) and Desert Moon Obs. (Dec. 20.26-29p4)
K09WA4G 2009 WG104 (arc=26 days, H=20.1 ~323m) from Desert Moon Obs. (Dec. 20.16-23p3)
K09W51X 2009 WX51 (Q=5.366 AU, arc=29 days, H=20.2 ~309m) from Carmelita Obs. (Dec. 20.78-81p3)
K09W06R 2009 WR6 (arc=32 days, H=18.3 ~741m) from Schiaparelli Obs. (Dec. 20.16-17p3)
K09W06K 2009 WK6 (arc=33 days, H=19.2 ~490m) from Spacewatch 1.8m (Dec. 20.49-50p3)
Observations of small asteroids (H>22.0)
K09X08L 2009 XL8 (arc=5 days, H=22.5 ~107m) from Desert Moon Obs. (Dec. 20.31-33p4)
K09X02P 2009 XP2 (arc=4 days, H=25.2 ~31m) from Schiaparelli Obs. (Dec. 14.92-93p3)
K09X02O 2009 XO2 (arc=8 days, H=23.5 ~68m) from Schiaparelli Obs. (Dec. 15.00-01p2) and MRO (Dec. 20.33-37p3)
K09W11C 2009 WC11 (arc=30 days, H=22.1 ~129m) from Spacewatch 1.8m (Dec. 20.48-49p3)
K02X38Y 2002 XY38 (arc=2 opp, H=23.1 ~81m) from Spacewatch 1.8m (Dec. 20.41-42p3 at V=21.8-22.4)
Observations of other objects
K09X02R 2009 XR2 (arc=7 days, H=19.2 ~490m) from Schiaparelli Obs. (Dec. 15.06-07p5)
K09X02B 2009 XB2 (arc=9 days, H=20.7 ~245m) from Desert Moon Obs. (Dec. 20.35-39p3)
K09X00D 2009 XD (Q=4.101 AU, arc=13 days, H=18.7 ~616m) from CSS (Dec. 20.20-22p4)
K09WP3E 2009 WE253 (Q=4.016 AU, arc=2 opp, H=17.6 ~1.02 km) from Desert Moon Obs. (Dec. 20.42-44p3)
K09WA4Z 2009 WZ104 (arc=24 days, H=20.5 ~269m) from Wishing Star Obs. (Dec. 19.01-04p3)
K09W54G 2009 WG54 (arc=27 days, H=21.1 ~204m) from MLS (Dec. 20.18-19p4)
K09W25W 2009 WW25 (arc=94 days, H=20.7 ~245m) from MLS (Dec. 20.14-15p3)
K09W00F 2009 WF (arc=34 days, H=19.8 ~371m) from MLS (Dec. 20.38-40p3)
K09U00N 2009 UN (Q=4.509 AU, arc=65 days, H=21.4 ~178m) from Spacewatch 1.8m (Dec. 20.46-47p3)
K09N00H 2009 NH (arc=162 days, H=18.8 ~589m) from CSS (Dec. 20.20-22p4)
K06U00R 2006 UR (arc=2 opp, H=19.3 ~467m) from Mt. Tuffley Obs. (Dec. 20.88-89p3)
K05T45O 2005 TO45 (arc=2 opp, H=19.8 ~371m) from Spacewatch 1.8m (Dec. 20.08-09p3 at V=21.6-22.1)
K04T18B 2004 TB18 (arc=3 opp, H=17.7 ~977m) from CSS (Dec. 20.45-48p4)
K04D00C 2004 DC (arc=3 opp, H=18.1 ~812m) from MLS (Dec. 20.26-28p7)
K03Q31A 2003 QA31 (arc=3 opp, H=19.1 ~513m) from Spacewatch 1.8m (Dec. 20.51-52p3)
K03Q00A 2003 QA (arc=2 opp, H=18.3 ~741m) from Spacewatch 1.8m (Dec. 20.28-29p3)
K02X91C 2002 XC91 (arc=2 opp, H=19.7 ~389m) from Desert Moon Obs. (Dec. 20.10-13p3)
K02W00P 2002 WP (arc=3 opp, H=18.4 ~708m) from Wishing Star Obs. (Dec. 18.14-16p3), MLS (Dec. 20.18-19p4), and Mt. Tuffley Obs. (Dec. 20.85p3)
H7651 177651 2004 XM14 from LINEAR (Dec. 20.20-25p5)
F9402 159402 1999 AP10 from Mt. Tuffley Obs. (Dec. 20.84p3)
F2560 152560 1991 BN from Pear Tree Obs. (Dec. 20.25-28p3)
85990 85990 1999 JV6 from MLS (Dec. 20.49-51p4)
11398 11398 1998 YP11 from LINEAR (Dec. 20.26-31p5)
08567 8567 1996 HW1 from MLS (Dec. 20.49-51p4)
05604 5604 1992 FE from CSS (Dec. 20.54-55p4)
05587 5587 1990 SB from LINEAR (Dec. 20.20-25p4)
03552 3552 Don Quixote (1983 SA) from Carmelita Obs. (Dec. 20.77-78p3)
03200 3200 Phaethon (1983 TB) from CSS (Dec. 20.09-11p4)
01865 1865 Cerberus (1971 UA) from LINEAR (Dec. 20.06-09p3)
00433 433 Eros (1898 DQ) from Mt. Tuffley Obs. (Dec. 20.82p3)

Observers on 21 December '09

Eighteen observing facilities appear in today's MPECs.

Code	Observer / observatory
`A74`	Bergen-Enkheim Obs. in Germany, 1 in MPEC 2009-Y34 -- 2009 XT6
`300`	Bisei Spaceguard Center in Japan, 1 in MPEC 2009-Y40 -- C/2009 Y2
`B20`	Carmelita Obs. in Spain, 2 in MPEC 2009-Y34 -- 2009 WX51, 3552
`703`	Catalina Sky Survey (CSS) in Arizona, 6 in MPECs 2009-Y34 & 2009-Y40 -- C/2009 Y2, 2009 XD, 2009 NH, 2004 TB18, 5604, 3200
`448`	Desert Moon Obs. in New Mexico, 6 in MPEC 2009-Y34 -- 2009 XL8, 2009 XF2, 2009 XB2, 2009 WG104, 2009 WE253, 2002 XC91
`J95`	Great Shefford Obs. in England, 4 in MPECs 2009-Y36, 2009-Y37, 2009-Y38 & 2009-Y40 -- 2009 YV6, 2009 YU6, 2009 YT6, C/2009 Y2
`704`	LINEAR in New Mexico, 4 in MPEC 2009-Y34 -- 177651, 11398, 5587, 1865
`H01`	Magdalena Ridge Obs. (MRO) in New Mexico, 5 in MPECs 2009-Y34, 2009-Y35, 2009-Y36, 2009-Y37 & 2009-Y40 -- 2009 YU6, 2009 YT6, 2009 YS6, C/2009 Y2, 2009 XO2
`568`	Mauna Kea in Hawaii, 1 in MPEC 2009-Y39 -- 2006 WS195
`900`	Moriyama Obs. in Japan, 1 in MPEC 2009-Y40 -- C/2009 Y2
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 12 in MPECs 2009-Y34, 2009-Y35, 2009-Y36, 2009-Y37, 2009-Y38 & 2009-Y40 -- 2009 YV6, 2009 YU6, 2009 YT6, 2009 YS6, C/2009 Y2, 2009 WW25, 2009 WG54, 2009 WF, 2004 DC, 2002 WP, 85990, 8567
`J93`	Mt. Tuffley Obs. in England, 4 in MPEC 2009-Y34 -- 2006 UR, 2002 WP, 159402, 433
`A24`	New Millennium Obs. in Italy, 1 in MPEC 2009-Y40 -- C/2009 Y2
`H23`	Pear Tree Obs. in Florida, 1 in MPEC 2009-Y34 -- 152560
`H36`	Sandlot Obs. in Kansas, 2 in MPECs 2009-Y35 & 2009-Y37 -- 2009 YU6, 2009 YS6
`204`	Schiaparelli Obs. in Italy, 7 in MPEC 2009-Y34 -- 2009 YG, 2009 XT6, 2009 XR2, 2009 XP2, 2009 XO2, 2009 XF2, 2009 WR6
`291`	Spacewatch 1.8m telescope in Arizona, 13 in MPECs 2009-Y34, 2009-Y35 & 2009-Y36 -- 2009 YT6, 2009 YS6, 2009 YQ, 2009 YG, 2009 XT6, 2009 XO, 2009 WK6, 2009 WC11, 2009 UN, 2005 TO45, 2003 QA31, 2003 QA, 2002 XY38
`I15`	Wishing Star Obs. in Rhode Island, 2 in MPEC 2009-Y34 -- 2009 WZ104, 2002 WP

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

Impact Risk Monitoring on 21 December '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 YV6	JPL Sentry	1657	2012-2106	27	4.1e-08	-4.68	-4.99	0	JPL: "Analysis based on 11 observations spanning .59126 days (2009-Dec-20.38323 to 2009-Dec-20.97449)." Diameter approximately 0.260 km. from mean, weighted H=20.6.

2009 YQ	JPL Sentry	1514	R E M O V E D						JPL: Risk listing removed at 1052 UTC.
2009 YQ	NEODyS	1514	R E M O V E D						-

2009 YG	JPL Sentry	1514	2033-2107	19	1.8e-07	-3.18	-3.70	0	JPL: "Analysis based on 33 observations spanning 3.0312 days (2009-Dec-17.42051 to 2009-Dec-20.45175)." Diameter approximately 0.826 km. from mean, weighted H=18.1.
2009 YG	NEODyS	1514	2033-2084	13	5.2e-08	-3.54	-3.82	0	NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2009/12/17.421 to 2009/12/20.453."

2009 XT6	NEODyS	1514	2071	1	4.83e-08	-4.76	-4.76	0	NEODyS: "Based on 77 optical observations (of which 0 are rejected as outliers) from 2009/12/13.406 to 2009/12/20.305."
2009 XT6	JPL Sentry	1514	R E M O V E D						-

2009 XO	NEODyS	1514	2028-2046	2	7.31e-08	-4.36	-4.38	0	NEODyS: "Based on 94 optical observations (of which 0 are rejected as outliers) from 2009/12/09.153 to 2009/12/20.318."

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 December '09

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

2038	Grabbed MPEC 2009-Y40 - Comet C/2009 Y2 (Kowalski) - see above Noted that the NEOCP has become empty
1808	Grabbed MPEC 2009-Y39 - 2006 WS195 - see above
1657	Noted that JPL Sentry has posted 2009 YV6 as an impact risk - see above
1543	Grabbed MPEC 2009-Y37 - 2009 YU6 - see above Grabbed MPEC 2009-Y38 - 2009 YV6 - see above
1514	Noted that NEODyS has updated its 2009 XO risk assessment - see above Noted that JPL Sentry has removed 2009 XT6 as an impact risk - see above Noted that NEODyS has updated its 2009 XT6 risk assessment - see above Noted that JPL Sentry has updated its 2009 YG risk assessment - see above Noted that NEODyS has updated its 2009 YG risk assessment - see above Noted that JPL Sentry has removed 2009 YQ as an impact risk - see above Noted that NEODyS has removed 2009 YQ as an impact risk - see above Grabbed MPEC 2009-Y34 - Daily Orbit Update - see above Grabbed MPEC 2009-Y35 - 2009 YS6 - see above Grabbed MPEC 2009-Y36 - 2009 YT6 - see above

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