2008-02-21 Tracking News

Contents on 21 February '08

IAU Minor Planet Center
- NEOCP Activity -- three listings: 3 updated
- New MPECs -- seven MPECs
- Observers -- two observing facilities
Impact Risk Monitoring -- two 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 21 February '08

The MPC's NEO Confirmation Page has 3 listings: 3 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had three updated listings. Of these, one was a "one nighter."

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 21 February '08

Minor Planet Electronic Circulars

As of last check at 2354 UTC, there have been seven MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-D18 time-stamped "07:06 UT" - Daily Orbit Update - see below
MPEC 2008-D19 time-stamped "17:15 UT" - Observable Comets - see below
MPEC 2008-D20 time-stamped "17:31 UT" - Distant Minor Planets - see below
MPEC 2008-D21 time-stamped "17:36 UT" - Atens and Apollos - see below
MPEC 2008-D22 time-stamped "17:36 UT" - Amors - see below
MPEC 2008-D23 time-stamped "17:36 UT" - Unusual Minor Planets - see below
MPEC 2008-D24 time-stamped "17:36 UT" - PHAs

MPEC 2008-D24 - "17:36 UT" - PHAs

MPEC 2008-D23 - "17:36 UT" - Unusual Minor Planets

MPEC 2008-D22 - "17:36 UT" - Amors

MPEC 2008-D21 - "17:36 UT" - Atens and Apollos

MPEC 2008-D20 - "17:31 UT" - Distant Minor Planets

MPEC 2008-D19 - "17:15 UT" - Observable Comets

<< DOU on 21 Feb. '08 >> MPEC 2008-D18 - "07:06 UT" - Daily Orbit Update

Observations of risk-listed objects
K08CB6L 2008 CL116 (Q=5.126 AU, arc=7 days, H=20.3 ~295m) from Astronomical Research Obs. (ARO) (Feb. 16.41-42p3)
K08C71C 2008 CC71 (small asteroid, arc=10 days, H=24.9 ~35m) from ARO (Feb. 16.36-37p3)
Observations of recently (no longer) risk-listed objects
K08CB8R 2008 CR118 (arc=8 days, H=18.8 ~589m) from ARO (Feb. 16.30-33p6)
K08C20M 2008 CM20 (arc=10 days, H=20.9 ~224m) from ARO (Feb. 16.04p2)
K08C06E 2008 CE6 (small asteroid, arc=9 days, H=23.5 ~68m) from ARO (Feb. 16.33-34p3)
Observations of small asteroids (H>22.0)
K08CB9E 2008 CE119 (arc=4 days, H=25.6 ~26m) from ARO (Feb. 16.30-31p3)
K08CB9A 2008 CA119 (arc=4 days, H=23.1 ~81m) from ARO (Feb. 16.39p3)
K08C70L 2008 CL70 (arc=7 days, H=23.0 ~85m) from ARO (Feb. 16.28-29p3)
K08C70H 2008 CH70 (arc=7 days, H=24.4 ~45m) from ARO (Feb. 16.16-18p4)
K08C00F 2008 CF (arc=15 days, H=26.5 ~17m) from ARO (Feb. 16.31-33p4)
K08B00E 2008 BE (arc=30 days, H=22.9 ~89m) from ARO (Feb. 16.40-41p3)
Observations of other objects
K08CB8Z 2008 CZ118 (arc=5 days, H=18.4 ~708m) from ARO (Feb. 16.43-44p3)
K08CB6R 2008 CR116 (arc=8 days, H=20.3 ~295m) from ARO (Feb. 16.35-36p5)
K08CB6M 2008 CM116 (arc=6 days, H=17.3 ~1.17 km) from ARO (Feb. 16.28-29p3)
K08C01N 2008 CN1 (arc=17 days, H=20.6 ~257m) from Atlante Obs. (Feb. 19.96-97p3)
K08A33N 2008 AN33 (Q=4.350 AU, arc=32 days, H=18.9 ~562m) from ARO (Feb. 16.38p3)
K08A28V 2008 AV28 (arc=59 days, H=19.6 ~407m) from ARO (Feb. 16.20-21p3)
K08A01G 2008 AG1 (arc=41 days, H=21.2 ~195m) from ARO (Feb. 16.23-25p3)
F3591 153591 2001 SN263 from Atlante Obs. (Feb. 19.98-99p3)
11398 11398 1998 YP11 from Atlante Obs. (Feb. 20.01-02p3)
03691 3691 Bede (1982 FT) from Atlante Obs. (Feb. 20.04-05p3)
01866 1866 Sisyphus (1972 XA) from Atlante Obs. (Feb. 20.10-11p3)
01627 1627 Ivar (1929 SH) from Atlante Obs. (Feb. 20.28-29p3)

Observers on 21 February '08

Two observing facilities appear in today's MPEC.

Code	Observer / observatory
`H55`	Astronomical Research Obs. (ARO) in Illinois, 17 in MPEC 2008-D18 -- 2008 CZ118, 2008 CR118, 2008 CR116, 2008 CM20, 2008 CM116, 2008 CL70, 2008 CL116, 2008 CH70, 2008 CF, 2008 CE6, 2008 CE119, 2008 CC71, 2008 CA119, 2008 BE, 2008 AV28, 2008 AN33, 2008 AG1
`J51`	Atlante Obs. in the Canary Islands, 6 in MPEC 2008-D18 -- 2008 CN1, 153591, 11398, 3691, 1866, 1627

Impact Risk Monitoring on 21 February '08

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2354 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.
Note that the time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090.
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

2008 CL116	NEODyS	1355	2078	2	7.31e-08	-4.81	-4.91	0	NEODyS: "Based on 60 optical observations (of which 0 are rejected as outliers) from 2008/02/10.407 to 2008/02/17.074."
2008 CL116	JPL Sentry	1354	2078-2102	5	1.8e-07	-4.45	-4.90	0	JPL: "Analysis based on 60 observations spanning 6.6665 days (2008-Feb-10.40671 to 2008-Feb-17.07319)." Diameter approximately 0.294 km. from mean, weighted H=20.3.

2008 CC71	NEODyS	1355	2034-2083	32	1.02e-04	-4.04	-4.20	0	NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2008/02/09.397 to 2008/02/19.487."
2008 CC71	JPL Sentry	1354	2033-2082	26	1.0e-04	-4.04	-4.20	0	JPL: "Analysis based on 32 observations spanning 10.090 days (2008-Feb-09.39625 to 2008-Feb-19.48606)." Diameter approximately 0.036 km. from mean, weighted H=24.9.

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 February '08

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

1844	Grabbed MPEC 2008-D21 - Atens and Apollos - see above Grabbed MPEC 2008-D22 - Amors - see above Grabbed MPEC 2008-D23 - Unusual Minor Planets - see above Grabbed MPEC 2008-D24 - PHAs - see above
1750	Grabbed MPEC 2008-D19 - Observable Comets - see above Grabbed MPEC 2008-D20 - Distant Minor Planets - see above
1355	Noted that NEODyS has updated its 2008 CC71 risk assessment - see above Noted that NEODyS has updated its 2008 CL116 risk assessment - see above
1354	Noted that JPL Sentry has updated its 2008 CC71 risk assessment - see above Noted that JPL Sentry has updated its 2008 CL116 risk assessment - see above Grabbed MPEC 2008-D18 - Daily Orbit Update - see above

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