2008-04-09 Tracking News

Contents on 9 April '08

IAU Minor Planet Center
- NEOCP Activity -- four listings: 1 new, 3 updated
- New MPECs -- fifteen MPECs
Observers -- eighteen observing facilities
Impact Risk Monitoring -- ten 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 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-G46 time-stamped "06:09 UT" - Daily Orbit Update - see below
MPEC 2008-G47 time-stamped "15:13 UT" - 2008 GP3 - see below
MPEC 2008-G48 time-stamped "15:18 UT" - 2008 GQ3 - see below
MPEC 2008-G49 time-stamped "15:23 UT" - 2008 GR3 - see below
MPEC 2008-G50 time-stamped "15:28 UT" - 2008 GS3 - see below
MPEC 2008-G51 time-stamped "15:31 UT" - 2008 GU3 - see below
MPEC 2008-G52 time-stamped "16:19 UT" - 2008 GV3 - see below
MPEC 2008-G53 time-stamped "16:25 UT" - 2008 GX3 - see below
MPEC 2008-G54 time-stamped "16:30 UT" - 2008 GY3 - see below
MPEC 2008-G55 time-stamped "16:36 UT" - 2008 GZ3 - see below
MPEC 2008-G56 time-stamped "16:39 UT" - 2008 GA4 - see below
MPEC 2008-G57 time-stamped "16:43 UT" - 2008 GB4 - see below
MPEC 2008-G58 time-stamped "17:58 UT" - Comet C/2008 G1 (Gibbs) - see below
MPEC 2008-G59 time-stamped "19:14 UT" - Comets C/2008 B1, 2008 B2, 2008 B3, 2008 B4 (SOHO) - see below
MPEC 2008-G60 time-stamped "19:27 UT" - Comets C/2008 C3, 2008 C4, 2008 C5 (SOHO)

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

CK08C050 C/2008 C5 from the HI1-A instrument (4) aboard STEREO-A (Feb. 5.18-49p24, 5.54-60p6 & 5.66-82p14) and the LASCO Coronagraph 3 aboard the Solar & Heliospheric Obs. (SOHO) (Feb. 5.74-93p18)
CK08C040 C/2008 C4 from STEREO-A/HI1-A (4) (Feb. 3.43-57p12) and SOHO C3 (Feb. 3.82-93p12 & 3.97-10p14)
CK08C030 C/2008 C3 from the LASCO Coronagraph 2 aboard the Solar & Heliospheric Obs. (SOHO) (Feb. 3.15-59p52)

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

CK08B040 C/2008 B4 from SOHO C3 (Jan. 29.90-93p4, 29.97-03p8 & 30.07-32p26)
CK08B030 C/2008 B3 from SOHO C3 (Jan. 28.70-78p10, 28.85-93p10 & 28.97-99p4)
CK08B020 C/2008 B2 from STEREO-A/HI1-A (4) (Jan. 26.91-68p58), SOHO C3 (Jan. 27.14p2, 27.22-28p8, 27.35-78p40, 27.82-93p12 & 27.97-18p20), and SOHO C2 (Jan. 28.23-29p10)
CK08B010 C/2008 B1 from SOHO C3 (Jan. 26.22-28p8, 26.32-36p4 & 26.40-51p10)

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

CK08G010 C/2008 G1 (Gibbs) (i=72.0°, q=3.721 AU, TP=2009 Feb. 7.311 TT) from the Mt. Lemmon Survey (MLS) (April 7.36-42p8, 8.38p4 & 9.40p1), the Catalina Sky Survey (CSS) (April 7.45-47p4), Schiaparelli Obs. (April 7.92-96p2), Remanzacco Obs. (April 7.95-97p3), RAS Obs. Mayhill (April 8.33-35p2), McDonald Obs. (April 8.41-42p3), Mt. John Obs. (April 8.66p3 & 9.63-64p4), and Sabino Canyon Obs. (April 9.32-34p3)

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

K08G04B 2008 GB4 (small asteroid, H=23.3 ~74m) was discovered at 0407 UT on 9 April by CSS, which observed it at April 9.17-22p8 and 9.27p4. The discovery was confirmed by Mt. John Obs. (April 9.37p5 & 9.42-43p4).

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

K08G04A 2008 GA4 (H=19.1 ~513m) was discovered at 0912 UT on 8 April by the Spacewatch 0.9m telescope, which observed it at April 8.38-42p3. The discovery was confirmed by the Spacewatch 1.8m telescope (April 8.46-47p3), Mt. John Obs. (April 8.62-63p4 & 9.65p4), and MLS (April 9.39p2).

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

K08G03Z 2008 GZ3 (small asteroid, H=25.3 ~29m) was discovered at 0714 UT on 8 April by LINEAR, which observed it at April 8.30-35p5. The discovery was confirmed by Great Shefford Obs. (April 9.03-04p3), Sabino Canyon Obs. (April 9.27-28p3), and Mt. John Obs. (April 9.55-56p4).

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

K08G03Y 2008 GY3 (H=20.7 ~245m) was discovered at 0516 UT on 8 April by MLS, which observed it at April 8.22-23p3, 8.30-35p12, and 9.18p4. The discovery was confirmed by Great Shefford Obs. (April 8.92-94p3).

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

K08G03X 2008 GX3 (small asteroid, Earth MOID=5.4 LD, H=25.8 ~23m) was discovered at 0435 UT on 8 April by LINEAR, which observed it at April 8.19-23p4. The discovery was confirmed by Great Shefford Obs. (April 8.90p4). This object is now within ten lunar distances (LD) of Earth, reaching 7.4 LD on 12 April.

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

K08G03V 2008 GV3 (i=72.6°, H=18.3 ~741m) was discovered at 0926 UT on 7 April by CSS, which observed it at April 7.39-41p4. The discovery was confirmed by LINEAR (April 7.36-39p4), Sabino Canyon Obs. (April 8.32p3), McDonald Obs. (April 8.40p3), Mt. John Obs. (April 8.64p4 & 9.43-44p3), Moriyama Obs. (April 8.66-67p2), and Great Shefford Obs. (April 9.08-09p4).

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

K08G03U 2008 GU3 (small asteroid, H=22.4 ~112m) was discovered at 0909 UT on 7 April by MLS, which observed it at April 7.38-40p4, 7.47p4, and 8.38p4.

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

K08G03S 2008 GS3 (small asteroid, H=22.2 ~123m) was discovered at 0717 UT on 7 April by LINEAR, which observed it at April 7.30-35p5. The discovery was confirmed by Schiaparelli Obs. (April 7.88-89p2), Great Shefford Obs. (April 7.92-93p4), Sabino Canyon Obs. (April 8.24p2), and MLS (April 8.33-35p4 & 8.41-48p12).

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

K08G03R 2008 GR3 (risk-listed, H=25.2 ~31m) was discovered at 0636 UT on 7 April by MLS, which observed it at April 7.28-29p4 at V=20.9-22.4, 7.41-42p3 at V=21.8, and 8.25-26p3 at V=21.4-21.7.

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

K08G03Q 2008 GQ3 (H=19.0 ~537m) was discovered at 0420 UT on 7 April by LINEAR, which observed it at April 7.18-23p5. The discovery was confirmed by Schiaparelli Obs. (April 7.84-88p3), Great Shefford Obs. (April 7.88-90p4), Astronomical Research Obs. (ARO) (April 8.05-06p2), McDonald Obs. (April 8.11-12p3), and Sabino Canyon Obs. (April 8.19-20p3).

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

K08G03P 2008 GP3 (small asteroid, Earth MOID=3.1 LD, H=25.4 ~28m) was discovered at 0554 UT on 3 April by Spacewatch 0.9m, which observed it at April 3.25-28p3. The discovery was confirmed by LINEAR (April 7.31-35p5), Schiaparelli Obs. (April 7.97-98p3), Great Shefford Obs. (April 8.09-13p4), Sabino Canyon Obs. (April 8.25-26p3), and Mt. John Obs. (April 8.67-68p4). This object will be coming within ten lunar distances (LD) of Earth, reaching 3.5 LD on 14 April.

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

Observations of risk-listed objects
K08G02M 2008 GM2 (small asteroid, arc=3 days, H=28.3 ~7m) from Spacewatch 1.8m (April 9.18p3)
K08G01D 2008 GD1 (small asteroid, Q=4.086 AU, arc=5 days, H=22.3 ~117m) from MLS (April 8.28-29p4)
K08G00K 2008 GK (small asteroid, arc=6 days, H=23.5 ~68m) from ARO (April 5.31-32p3) and Spacewatch 1.8m (April 8.28-29p3 & 9.16-17p3)
K08F07K 2008 FK7 (small asteroid, arc=8 days, H=23.1 ~81m) from Spacewatch 0.9m (April 4.36-39p2) and Spacewatch 1.8m (April 8.30-31p3)
K08F06T 2008 FT6 (arc=10 days, H=17.5 ~1.07 km) from Spacewatch 1.8m (April 8.32-33p3)
K08F00N 2008 FN (i=44.7°, arc=12 days, H=18.4 ~708m) from Spacewatch 1.8m (April 8.34p3)
Observations of recently (no longer) risk-listed objects
K08G00J 2008 GJ (arc=7 days, H=20.6 ~257m) from Spacewatch 1.8m (April 8.26-27p2)
K08G00G 2008 GG (q=0.259 AU, arc=4 days, H=20.3 ~295m) from ARO (April 5.25-27p3 at V=22.1-2)
Observations of small asteroids (H>22.0)
K08G00Q 2008 GQ (arc=2 days, H=25.0 ~34m) from ARO (April 5.35-36p3)
K08G00E 2008 GE (arc=4 days, H=23.3 ~74m) from ARO (April 5.32-34p3)
K08F07L 2008 FL7 (arc=4 days, H=24.4 ~45m) from Spacewatch 0.9m (April 4.41-45p3)
K08F00H 2008 FH (arc=12 days, H=24.3 ~47m) from ARO (April 5.20p3 & 8.09p3)
K08E07P 2008 EP7 (arc=30 days, H=23.6 ~65m) from ARO (April 5.19-20p3)
Observations of almost-small asteroids (21.7<H<=22.0)
K05G08Y 2005 GY8 (arc=2 opp, H=21.8 ~148m) from CSS (April 8.42-44p4)
Observations of other objects
K08G00X 2008 GX (arc=5 days, H=19.3 ~467m) from Peter De Cat via Uccle Obs. (April 7.87-91p5), ARO (April 8.07-08p3), and McDonald Obs. (April 8.21-23p3)
K08F06Y 2008 FY6 (arc=7 days, H=20.2 ~309m) from ARO (April 5.28-29p3)
K08F06W 2008 FW6 (arc=9 days, H=20.9 ~224m) from ARO (April 5.29-30p3) and CSS (April 8.36-38p4)
K08F05W 2008 FW5 (arc=11 days, H=21.7 ~155m) from Spacewatch 1.8m (April 8.38p2)
K08F00G 2008 FG (i=39.2°, arc=9 days, H=19.8 ~371m) from ARO (April 5.22-23p2)
K08E05Z 2008 EZ5 (arc=35 days, H=19.6 ~407m) from Mt. John Obs. (April 8.72-73p5)
K08E05Y 2008 EY5 (q=0.234 AU, arc=35 days, H=20.1 ~323m) from ARO (April 8.07p3)
K08D05K 2008 DK5 (arc=41 days, H=21.4 ~178m) from Spacewatch 1.8m (April 9.14-15p3)
K08D05J 2008 DJ5 (arc=39 days, H=19.9 ~355m) from Spacewatch 0.9m (April 5.14p1)
K08D00J 2008 DJ (arc=44 days, H=20.5 ~269m) from Spacewatch 1.8m (April 9.12-13p3)
K08C01N 2008 CN1 (arc=66 days, H=20.6 ~257m) from ARO (April 8.05-06p3)
K07Y00K 2007 YK (arc=2 opp, H=17.6 ~1.02 km) from McDonald Obs. (April 8.17-20p3)
K07R09U 2007 RU9 (arc=2 opp, H=20.7 ~245m) from ARO (April 5.29-32p2 at V=22.8)
K06F35V 2006 FV35 (arc=5 opp, H=21.6 ~162m) from LINEAR (April 8.25-28p4)
K06D62U 2006 DU62 (arc=3 opp, H=18.0 ~851m) from McDonald Obs. (April 8.13-16p3)
K03G00W 2003 GW (i=49.4°, arc=3 opp, H=16.7 ~1.55 km) from Hack Obs. (April 5.83p8)
K02F05W 2002 FW5 (i=46.4°, arc=3 opp, H=19.3 ~467m) from LINEAR (April 8.30-35p5)
J93T02Q 1993 TQ2 (arc=2 opp, H=20.0 ~339m) from MLS (April 8.19-20p4)
G2422 162422 2000 EV70 from LINEAR (April 8.32-35p3)
F4453 154453 2003 CJ11 from Spacewatch 0.9m (April 4.47-50p2)
E4922 144922 2005 CK38 from LINEAR (April 8.18-23p5)
99935 99935 2002 AV4 from MLS (April 8.16-23p7)
86819 86819 2000 GK137 from Spacewatch 0.9m (April 4.14p1)
86667 86667 2000 FO10 from LINEAR (April 8.31-35p4)
66008 66008 1998 QH2 from De Cat/Uccle (April 8.13-15p5)
24445 24445 2000 PM8 from LINEAR (April 8.35-40p4)
11054 11054 1991 FA from Spacewatch 0.9m (April 8.33-37p3)
09162 9162 1987 OA from LINEAR (April 8.25-29p5)
06456 6456 Golombek (1992 OM) from LINEAR (April 8.27-29p3)
03757 3757 1982 XB from Spacewatch 0.9m (April 4.30-33p3)
01864 1864 Daedalus (1971 FA) from LINEAR (April 8.24-29p5)

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.

Code	Observer / observatory
`H55`	Astronomical 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
`703`	Catalina 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
`J95`	Great 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
`A57`	Hack Obs. in Italy, 1 in MPEC 2008-G46 -- 2003 GW
`704`	LINEAR 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
`711`	McDonald 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
`900`	Moriyama Obs. in Japan, 1 in MPEC 2008-G52 -- 2008 GV3
`474`	Mt. 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
`G96`	Mt. 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
`H06`	RAS Obs. Mayhill in New Mexico, 1 in MPEC 2008-G58 -- C/2008 G1
`473`	Remanzacco Obs. in Italy, 1 in MPEC 2008-G58 -- C/2008 G1
`C494`	HI1-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
`854`	Sabino 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
`204`	Schiaparelli Obs. in Italy, 4 in MPECs 2008-G47, 2008-G48, 2008-G50 & 2008-G58 -- 2008 GS3, 2008 GQ3, 2008 GP3, C/2008 G1
`2492`	LASCO 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
`2493`	LASCO 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
`691`	Spacewatch 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
`291`	Spacewatch 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
`0125`	Peter 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 GR3	JPL Sentry	1803	2010-2107	307	2.1e-06	-5.59	-6.07	0	JPL: "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 GM2	NEODyS	1500	2063-2090	9	2.63e-06	-7.51	-7.77	0	NEODyS: "Based on 37 optical observations (of which 0 are rejected as outliers) from 2008/04/06.414 to 2008/04/09.184."
2008 GM2	JPL Sentry	1459	2063-2108	44	2.1e-05	-6.70	-7.38	0	JPL: "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 GD1	NEODyS	1500	2056-2086	3	1.44e-08	-6.38	-6.52	0	NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2008/04/03.282 to 2008/04/08.295."
2008 GD1	JPL Sentry	1459	2056-2091	2	7.7e-09	-6.66	-6.90	0	JPL: "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 GK	JPL Sentry	0452	R E M O V E D						JPL: Risk listing removed at 0312 UTC.

2008 GC	JPL Sentry	1459	2010-2107	309	2.1e-06	-5.59	-6.07	0	JPL: "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 FK7	JPL Sentry	0452	R E M O V E D						JPL: Risk listing removed at 0433 UTC.

2008 FT6	JPL Sentry	0452	R E M O V E D						JPL: Risk listing removed at 0448 UTC.

2008 FN	JPL Sentry	1459	R E M O V E D						JPL: Risk listing removed at 0513 UTC.

2008 ER7	JPL Sentry	0309	2077-2102	5	1.9e-06	-3.40	-3.77	0	JPL: "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 HJ31	JPL Sentry	0309	2098	1	1.1e-09	-8.58	-8.58	0	JPL: "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.

2018	Grabbed 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
1922	Grabbed MPEC 2008-G58 - Comet C/2008 G1 (Gibbs) - see above
1803	Noted that JPL Sentry has posted 2008 GR3 as an impact risk - see above
1705	Grabbed MPEC 2008-G55 - 2008 GZ3 - see above Grabbed MPEC 2008-G56 - 2008 GA4 - see above Grabbed MPEC 2008-G57 - 2008 GB4 - see above
1704	Grabbed MPEC 2008-G52 - 2008 GV3 - see above Grabbed MPEC 2008-G53 - 2008 GX3 - see above Grabbed MPEC 2008-G54 - 2008 GY3 - see above
1559	Grabbed 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
1500	Noted that NEODyS has updated its 2008 GM2 risk assessment - see above Grabbed MPEC 2008-G46 - Daily Orbit Update - see above
1459	Noted 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
0452	Noted 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
0309	Noted 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

http://www.HohmannTransfer.com/mn/08/08100_0409.htm
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