Contents  on 9 April '08

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NEOCP Activity  on 9 April '08

The MPC's NEO Confirmation Page has 4 listings: 1 new, 3 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new and three updated listings. All of these were "one nighters." The Tracking News counted a total of 23 objects listed on the NEOCP at some point on this day.

New MPECs  on 9 April '08

Minor Planet Electronic Circulars

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


MPEC 2008-G60 - "19:27 UT" - Comets C/2008 C3, 2008 C4, 2008 C5 (SOHO)


MPEC 2008-G59 - "19:14 UT" - Comets C/2008 B1, 2008 B2, 2008 B3, 2008 B4 (SOHO)


MPEC 2008-G58 - "17:58 UT" - Comet C/2008 G1 (Gibbs)


MPEC 2008-G57 - "16:43 UT" - 2008 GB4


MPEC 2008-G56 - "16:39 UT" - 2008 GA4


MPEC 2008-G55 - "16:36 UT" - 2008 GZ3


MPEC 2008-G54 - "16:30 UT" - 2008 GY3


MPEC 2008-G53 - "16:25 UT" - 2008 GX3


MPEC 2008-G52 - "16:19 UT" - 2008 GV3


MPEC 2008-G51 - "15:31 UT" - 2008 GU3


MPEC 2008-G50 - "15:28 UT" - 2008 GS3


MPEC 2008-G49 - "15:23 UT" - 2008 GR3


MPEC 2008-G48 - "15:18 UT" - 2008 GQ3


MPEC 2008-G47 - "15:13 UT" - 2008 GP3


<< DOU on 9 Apr. '08 >>  MPEC 2008-G46 - "06:09 UT" - Daily Orbit Update

Note: In addition to what you see above, this DOU MPEC includes a lot of misidentified data that hasn't been publicly corrected in detail by the MPC and which was removed from the reporting here on May 8th to rectify the observing credits record. The MPC Status page notes "2008 Apr. 9: 11:00. As a result of a designation snafu yesterday, some observations attributed to objects with K08G00x designations do not belong. These observations will be appearing on forthcoming MPECs under their intended designations." Since the current MPEC version preserves all the original mistakes, here is an explanation of what's wrong, found by matching the data with subsequent MPECs and by cross-checking with MPES ephemeris residuals. It was determined that the object reported with packed designation K08G00A is actually K08G03P (2008 GP3), K08G00B is 2008 GQ3, K08G00C is 2008 GR3, K08G00D is 2008 GS3, K08G00D is 2008 GS3, and K08G00F is 2008 GU3, all of which have their own discovery MPECs. The first triplets for K08G00E and K08G00G from H55 (ARO) are valid for the objects 2008 GE and 2008 GG, while the remaining observations for K08G00E appear in no other MPEC and for K08G00G belong to 2008 GV3. Note that none of the discovery-coded (*) observations are correctly identified. It appears that the remaining observations for objects with K08G00x designations in this DOU are valid for their respective objects.

Observers  on 9 April '08

Eighteen observing facilities appeared in this day's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 14 in MPECs 2008-G46 & 2008-G48 -- 2008 GX, 2008 GQ3, 2008 GQ, 2008 GK, 2008 GG, 2008 GE, 2008 FY6, 2008 FW6, 2008 FH, 2008 FG, 2008 EY5, 2008 EP7, 2008 CN1, 2007 RU9
703Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2008-G46, 2008-G52, 2008-G57 & 2008-G58 -- 2008 GV3, 2008 GB4, C/2008 G1, 2008 FW6, 2005 GY8
J95Great Shefford Obs. in England, 7 in MPECs 2008-G47, 2008-G48, 2008-G50, 2008-G52, 2008-G53, 2008-G54 & 2008-G55 -- 2008 GZ3, 2008 GY3, 2008 GX3, 2008 GV3, 2008 GS3, 2008 GQ3, 2008 GP3
A57Hack Obs. in Italy, 1 in MPEC 2008-G46 -- 2003 GW
704LINEAR in New Mexico, 15 in MPECs 2008-G46, 2008-G47, 2008-G48, 2008-G50, 2008-G52, 2008-G53 & 2008-G55 -- 2008 GZ3, 2008 GX3, 2008 GV3, 2008 GS3, 2008 GQ3, 2008 GP3, 2006 FV35, 2002 FW5, 86667, 24445, 162422, 144922, 9162, 6456, 1864
711McDonald Obs. in Texas, 6 in MPECs 2008-G46, 2008-G48, 2008-G52 & 2008-G58 -- 2008 GX, 2008 GV3, 2008 GQ3, C/2008 G1, 2007 YK, 2006 DU62
900Moriyama Obs. in Japan, 1 in MPEC 2008-G52 -- 2008 GV3
474Mt. John Obs. in New Zealand, 7 in MPECs 2008-G46, 2008-G47, 2008-G52, 2008-G55, 2008-G56, 2008-G57 & 2008-G58 -- 2008 GZ3, 2008 GV3, 2008 GP3, 2008 GB4, 2008 GA4, C/2008 G1, 2008 EZ5
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2008-G46, 2008-G49, 2008-G50, 2008-G51, 2008-G54, 2008-G56 & 2008-G58 -- 2008 GY3, 2008 GU3, 2008 GS3, 2008 GR3, 2008 GD1, 2008 GA4, C/2008 G1, 1993 TQ2, 99935
H06RAS Obs. Mayhill in New Mexico, 1 in MPEC 2008-G58 -- C/2008 G1
473Remanzacco Obs. in Italy, 1 in MPEC 2008-G58 -- C/2008 G1
C494HI1-A instrument (4) aboard STEREO-A in heliocentric orbit leading Earth, 3 in MPECs 2008-G59 & 2008-G60 -- C/2008 C5, C/2008 C4, C/2008 B2
854Sabino Canyon Obs. in Arizona, 6 in MPECs 2008-G47, 2008-G48, 2008-G50, 2008-G52, 2008-G55 & 2008-G58 -- 2008 GZ3, 2008 GV3, 2008 GS3, 2008 GQ3, 2008 GP3, C/2008 G1
204Schiaparelli Obs. in Italy, 4 in MPECs 2008-G47, 2008-G48, 2008-G50 & 2008-G58 -- 2008 GS3, 2008 GQ3, 2008 GP3, C/2008 G1
2492LASCO Coronagraph 2 (SOHO C2) aboard the Solar & Heliospheric Obs. (SOHO) in Earth-Sun L1 HALO orbit, 2 in MPECs 2008-G59 & 2008-G60 -- C/2008 C3, C/2008 B2
2493LASCO Coronagraph 3 (SOHO C3) aboard the Solar & Heliospheric Obs. (SOHO) in Earth-Sun L1 HALO orbit, 6 in MPECs 2008-G59 & 2008-G60 -- C/2008 C5, C/2008 C4, C/2008 B4, C/2008 B3, C/2008 B2, C/2008 B1
691Spacewatch 0.9m telescope in Arizona, 9 in MPECs 2008-G46, 2008-G47 & 2008-G56 -- 2008 GP3, 2008 GA4, 2008 FL7, 2008 FK7, 2008 DJ5, 86819, 154453, 11054, 3757
291Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2008-G46 & 2008-G56 -- 2008 GM2, 2008 GK, 2008 GJ, 2008 GA4, 2008 FW5, 2008 FT6, 2008 FN, 2008 FK7, 2008 DK5, 2008 DJ
0125Peter De Cat via Uccle Obs. in Belgium, 2 in MPEC 2008-G46 -- 2008 GX, 66008
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 April '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 GR3JPL Sentry18032010-21073072.1e-06-5.59-6.070JPL: "Analysis based on 10 observations spanning .98493 days (2008-Apr-07.27516 to 2008-Apr-08.26009)." Diameter approximately 0.033 km. from mean, weighted H=25.1.
2008 GM2NEODyS15002063-209092.63e-06-7.51-7.770NEODyS: "Based on 37 optical observations (of which 0 are rejected as outliers) from 2008/04/06.414 to 2008/04/09.184."
JPL Sentry14592063-2108442.1e-05-6.70-7.380JPL: "Analysis based on 37 observations spanning 2.7703 days (2008-Apr-06.41278 to 2008-Apr-09.18308)." Diameter approximately 0.008 km. from mean, weighted H=28.3.
2008 GD1NEODyS15002056-208631.44e-08-6.38-6.520NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2008/04/03.282 to 2008/04/08.295."
JPL Sentry14592056-209127.7e-09-6.66-6.900JPL: "Analysis based on 20 observations spanning 5.0135 days (2008-Apr-03.28088 to 2008-Apr-08.29435)." Diameter approximately 0.135 km. from mean, weighted H=22.0.
2008 GKJPL Sentry0452R E M O V E DJPL: Risk listing removed at 0312 UTC.
2008 GCJPL Sentry14592010-21073092.1e-06-5.59-6.070JPL: "Analysis based on 10 observations spanning .98493 days (2008-Apr-07.27516 to 2008-Apr-08.26009)." Diameter approximately 0.033 km. from mean, weighted H=25.1.
2008 FK7JPL Sentry0452R E M O V E DJPL: Risk listing removed at 0433 UTC.
2008 FT6JPL Sentry0452R E M O V E DJPL: Risk listing removed at 0448 UTC.
2008 FNJPL Sentry1459R E M O V E DJPL: Risk listing removed at 0513 UTC.
2008 ER7JPL Sentry03092077-210251.9e-06-3.40-3.770JPL: "Analysis based on 82 observations spanning 29.893 days (2008-Mar-06.33608 to 2008-Apr-05.22865)." Diameter approximately 0.320 km. from mean, weighted H=20.1.
2001 HJ31JPL Sentry0309209811.1e-09-8.58-8.580JPL: "Analysis based on 25 observations spanning 4.0436 days (2001-Apr-26.24716 to 2001-Apr-30.29076)." Diameter approximately 0.063 km. from mean, weighted H=23.7.

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 9 April '08

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

2018Grabbed MPEC 2008-G59 - Comets C/2008 B1, 2008 B2, 2008 B3, 2008 B4 (SOHO) - see above
Grabbed MPEC 2008-G60 - Comets C/2008 C3, 2008 C4, 2008 C5 (SOHO) - see above
1922Grabbed MPEC 2008-G58 - Comet C/2008 G1 (Gibbs) - see above
1803Noted that JPL Sentry has posted 2008 GR3 as an impact risk - see above
1705Grabbed MPEC 2008-G55 - 2008 GZ3 - see above
Grabbed MPEC 2008-G56 - 2008 GA4 - see above
Grabbed MPEC 2008-G57 - 2008 GB4 - see above
1704Grabbed MPEC 2008-G52 - 2008 GV3 - see above
Grabbed MPEC 2008-G53 - 2008 GX3 - see above
Grabbed MPEC 2008-G54 - 2008 GY3 - see above
1559Grabbed MPEC 2008-G47 - 2008 GP3 - see above
Grabbed MPEC 2008-G48 - 2008 GQ3 - see above
Grabbed MPEC 2008-G49 - 2008 GR3 - see above
Grabbed MPEC 2008-G50 - 2008 GS3 - see above
Grabbed MPEC 2008-G51 - 2008 GU3 - see above
1500Noted that NEODyS has updated its 2008 GM2 risk assessment - see above
Grabbed MPEC 2008-G46 - Daily Orbit Update - see above
1459Noted that JPL Sentry has removed 2008 FN as an impact risk - see above
Noted that JPL Sentry has posted 2008 GC as an impact risk - see above
Noted that JPL Sentry has posted 2008 GD1 as an impact risk - see above
Noted that NEODyS has posted 2008 GD1 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 GM2 risk assessment - see above
0452Noted that JPL Sentry has removed 2008 FK7 as an impact risk - see above
Noted that JPL Sentry has removed 2008 FT6 as an impact risk - see above
Noted that JPL Sentry has removed 2008 GK as an impact risk - see above
0309Noted that JPL Sentry has posted 2001 HJ31 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 ER7 risk assessment - see above