Contents  on 3 April '08

Resources:

The latest A/CC news is available via framed access, RSS news feed 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 3 April '08

The MPC's NEO Confirmation Page has 6 listings: 6 updated

When last checked at 2356 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had six updated listings. Of these, three were "one nighters." So far The Tracking News has counted a total of seven 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 3 April '08

Minor Planet Electronic Circulars

As of last check at 2357 UTC, there have been four MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2008-G19 - "18:38 UT" - 2008 GK


MPEC 2008-G18 - "17:11 UT" - 2008 CP23


MPEC 2008-G17 - "16:23 UT" - Comet C/2008 E3 (Garradd)


<< DOU on 3 Apr. '08 >>  MPEC 2008-G16 - "06:08 UT" - Daily Orbit Update

Observers  on 3 April '08

Fourteen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 8 in MPEC 2008-G16 -- 2008 FW5, 2008 FN, 2008 FL7, 2008 FJ, 2008 FG5, 2008 FC, 2008 ED8, 1999 FA
467Auckland Obs. in New Zealand, 1 in MPEC 2008-G17 -- C/2008 E3
300Bisei Spaceguard Center in Japan, 1 in MPEC 2008-G18 -- 2008 CP23
703Catalina Sky Survey in Arizona, 1 in MPEC 2008-G18 -- 2008 CP23
J95Great Shefford Obs. in England, 1 in MPEC 2008-G16 -- 2008 GF
H51Greiner Research Obs. (GRO) in Wisconsin, 5 in MPEC 2008-G16 -- 2008 GD, 2008 FU6, 2008 FG5, 2004 FG11, 2002 FW5
704LINEAR in New Mexico, 5 in MPEC 2008-G16 -- 2004 CR2, 2002 FW5, 53319, 41429, 9162
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2008-G16, 2008-G18 & 2008-G19 -- 2008 GK, 2008 CP23, 7977
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2008-G16 -- 2003 GW
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2008-G19 -- 2008 GK
473Remanzacco Obs. in Italy, 1 in MPEC 2008-G16 -- 2007 VQ4
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2008-G19 -- 2008 GK
691Spacewatch 0.9m telescope in Arizona, 8 in MPECs 2008-G16 & 2008-G18 -- 2008 FK, 2008 FG5, 2008 CP23, 2004 RY109, 86819, 53435, 24445, 162422
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2008-G16 & 2008-G19 -- 2008 GK, 2008 GF, 2008 FN, 2008 ER7
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 April '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2356 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 GKJPL Sentry22592011-21081522.0e-07-5.28-6.050JPL: "Analysis based on 21 observations spanning .13815 days (2008-Apr-03.21727 to 2008-Apr-03.35542)." Diameter approximately 0.069 km. from mean, weighted H=23.5.
2008 GJNEODyS13482034-205935.32e-10-6.85-6.980NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2008/04/01.299 to 2008/04/02.260."
2008 GHNEODyS13482075-208726.07e-11-9.45-9.600NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2008/04/01.298 to 2008/04/02.222."
2008 GGNEODyS15352020-207069.07e-09-5.88-5.890NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2008/04/01.272 to 2008/04/02.199."
2008 GFJPL Sentry1347R E M O V E DJPL: Risk listing removed at 1053 UTC.
2008 FL7JPL Sentry1347R E M O V E DJPL: Risk listing removed at 1132 UTC.
2008 FNNEODyS13482023-205262.74e-09-4.68-5.160NEODyS: "Based on 42 optical observations (of which 0 are rejected as outliers) from 2008/03/27.460 to 2008/04/02.381."
JPL Sentry13472023-208683.3e-09-4.67-5.240JPL: "Analysis based on 42 observations spanning 5.9207 days (2008-Mar-27.45915 to 2008-Apr-02.37984)." Diameter approximately 0.740 km. from mean, weighted H=18.3.
2008 ER7NEODyS13482073-208944.76e-07-3.91-4.040NEODyS: "Based on 74 optical observations (of which 0 are rejected as outliers) from 2008/03/06.337 to 2008/04/03.178."
JPL Sentry13472077-210461.6e-06-3.46-3.880JPL: "Analysis based on 74 observations spanning 27.841 days (2008-Mar-06.33608 to 2008-Apr-03.1774)." Diameter approximately 0.320 km. from mean, weighted H=20.1.

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 3 April '08

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

2259Noted that JPL Sentry has posted 2008 GK as an impact risk - see above
1944Grabbed MPEC 2008-G19 - 2008 GK - see above
1734Grabbed MPEC 2008-G18 - 2008 CP23 - see above
1639Grabbed MPEC 2008-G17 - Comet C/2008 E3 (Garradd) - see above
1534Noted that NEODyS has posted 2008 GG as an impact risk - see above
1348Noted that NEODyS has updated its 2008 ER7 risk assessment - see above
Noted that NEODyS has updated its 2008 FN risk assessment - see above
1347Noted that JPL Sentry has updated its 2008 ER7 risk assessment - see above
Noted that JPL Sentry has removed 2008 FL7 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 FN risk assessment - see above
Noted that JPL Sentry has removed 2008 GF as an impact risk - see above
Noted that NEODyS has posted 2008 GH as an impact risk - see above
Noted that NEODyS has posted 2008 GJ as an impact risk - see above
Grabbed MPEC 2008-G16 - Daily Orbit Update - see above