2008-04-15 Tracking News

Contents on 15 April '08

Radar Astrometry -- one object
IAU Minor Planet Center
- NEOCP Activity -- two listings: 1 new, 1 updated
- New MPECs -- nine MPECs
Observers -- sixteen 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
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.

Radar Astrometry on 15 April '08

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added the following small-body radar observing work:

Data addition noted at 2354 UTC when the database was dated 15 April

2005 NB7 from Arecibo (April 11.88 velocity & 11.88 range) - see 2005 NB7 planning

NEOCP Activity on 15 April '08

The MPC's NEO Confirmation Page has 2 listings: 1 new, 1 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new and one updated listing. Both of these were "one nighters." So far The Tracking News has counted a total of fifteen 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 15 April '08

Minor Planet Electronic Circulars

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

MPEC 2008-G83 time-stamped "06:09 UT" - Daily Orbit Update - see below
MPEC 2008-G84 time-stamped "18:48 UT" - 2008 GA110 - see below
MPEC 2008-G85 time-stamped "18:54 UT" - 2008 GB110 - see below
MPEC 2008-G86 time-stamped "18:57 UT" - 2008 GC110 - see below
MPEC 2008-G87 time-stamped "19:04 UT" - 2008 GD110 - see below
MPEC 2008-G88 time-stamped "19:06 UT" - 2008 GE110 - see below
MPEC 2008-G89 time-stamped "19:11 UT" - 2008 GF110 - see below
MPEC 2008-G90 time-stamped "19:20 UT" - 2008 GH110 - see below
MPEC 2008-G91 time-stamped "19:37 UT" - 2008 GJ110

MPEC 2008-G91 - "19:37 UT" - 2008 GJ110

K08GB0J 2008 GJ110 (q=0.310 AU, H=20.4 ~282m) was discovered at 0408 UT on 15 April by the Catalina Sky Survey (CSS), which observed it at April 15.17-23p8 and 15.29p4. The discovery was confirmed by Astronomical Research Obs. (ARO) (April 15.26-27p3), Sabino Canyon Obs. (April 15.27p3), and Greiner Research Obs. (GRO) (April 15.36p4).

MPEC 2008-G90 - "19:20 UT" - 2008 GH110

K08GB0H 2008 GH110 (risk-listed, Earth MOID=3.1 LD, H=20.2 ~309m) was discovered at 1106 UT on 14 April by the Mt. Lemmon Survey (MLS), which observed it at April 14.46-49p8. The discovery was confirmed by ARO (April 15.29-30p3), Desert Moon Obs. (April 15.33-36p3), and Sabino Canyon Obs. (April 15.34-36p3).

MPEC 2008-G89 - "19:11 UT" - 2008 GF110

K08GB0F 2008 GF110 (H=18.5 ~676m) was discovered at 0919 UT on 14 April by MLS, which observed it at April 14.31-33p4, 14.39-41p4, 15.18-20p4, and 15.24-27p8. The discovery was confirmed by ARO (April 15.14-16p3).

MPEC 2008-G88 - "19:06 UT" - 2008 GE110

K08GB0E 2008 GE110 (borderline-small, H=22.0 ~135m) was discovered at 0720 UT on 14 April by MLS, which observed it at April 14.31-33p4, 14.39-41p4, and 15.24-26p8. The discovery was confirmed by the Spacewatch 1.8m telescope (April 14.39p3 & 15.17-18p3) and ARO (April 15.14-15p3).

MPEC 2008-G87 - "19:04 UT" - 2008 GD110

K08GB0D 2008 GD110 (risk-listed, Earth MOID=0.2 LD, H=24.5 ~43m) was discovered at 0653 UT on 14 April by CSS, which observed it at April 14.29-34p8. The discovery was confirmed by Sabino Canyon Obs. (April 15.30-31p3) and Cristovao Jacques via RAS Obs. Moorook (April 15.45p3). This object will be coming within ten lunar distances (LD) of Earth, reaching 3.0 LD on 23 April.

MPEC 2008-G86 - "18:57 UT" - 2008 GC110

K08GB0C 2008 GC110 (small asteroid, H=22.3 ~117m) was discovered at 0616 UT on 14 April by the Spacewatch 0.9m telescope, which observed it at April 14.26-30p3. The discovery was confirmed by Spacewatch 1.8m (April 14.35p3 & 14.43-45p3), Farpoint Obs. (April 14.38-39p4), ARO (April 15.20-21p3), Desert Moon Obs. (April 15.25-30p3), and MLS (April 15.39-40p4).

MPEC 2008-G85 - "18:54 UT" - 2008 GB110

K08GB0B 2008 GB110 (i=38.4°, H=19.6 ~407m) was discovered at 0547 UT on 14 April by LINEAR, which observed it at April 14.24-29p4. The discovery was confirmed by MLS (April 15.21-23p4 & 15.27-29p4) and Sabino Canyon Obs. (April 15.28-29p3).

MPEC 2008-G84 - "18:48 UT" - 2008 GA110

K08GB0A 2008 GA110 (risk-listed, Q=4.417 AU, H=21.9 ~141m) was discovered at 0438 UT on 14 April by Spacewatch 0.9m, which observed it at April 14.19-23p3. The discovery was confirmed by Spacewatch 1.8m (April 14.30-31p3, 14.41-42p3 & 15.18-19p3), Farpoint Obs. (April 14.35-36p3), and ARO (April 15.18-19p3).

<< DOU on 15 Apr. '08 >> MPEC 2008-G83 - "06:09 UT" - Daily Orbit Update

Observations of risk-listed objects
K08G02M 2008 GM2 (small asteroid, arc=8 days, H=28.3 ~7m) from Spacewatch 1.8m (April 14.24-26p3)
Observations of recently (no longer) risk-listed objects
K08G21B 2008 GB21 (small asteroid, arc=2 days, H=26.0 ~21m) from Powell Obs. (April 14.22-23p4)
K08F06T 2008 FT6 (arc=16 days, H=17.6 ~1.02 km) from Spacewatch 1.8m (April 14.28-29p3)
K08E69C 2008 EC69 (Q=4.454 AU, arc=56 days, H=17.0 ~1.35 km) from CSS (April 14.46-47p4)
Observations of small asteroids (H>22.0)
K08G04B 2008 GB4 (arc=5 days, H=23.4 ~71m) from ARO (April 14.25p3)
K08E09E 2008 EE9 (arc=36 days, H=22.3 ~117m) from MLS (April 13.20-22p4)
J98K03G 1998 KG3 (arc=3 opp, H=22.3 ~117m) from LINEAR (April 14.30-34p5) and CSS (April 14.37-40p4)
Observations of almost-small asteroids (21.7<H<=22.0)
K08G20W 2008 GW20 (arc=3 days, H=21.8 ~148m) from Powell Obs. (April 14.24-25p4)
Observations of other objects
K08G20P 2008 GP20 (arc=4 days, H=19.6 ~407m) from CSS (April 13.33-35p4) and Powell Obs. (April 14.21-22p4)
K08G04A 2008 GA4 (arc=6 days, H=19.1 ~513m) from Spacewatch 0.9m (April 12.38-42p3) and Spacewatch 1.8m (April 14.26-27p2)
K08E09M 2008 EM9 (q=0.291 AU, arc=36 days, H=17.4 ~1.12 km) from LINEAR (April 14.24-28p5)
K08B22C 2008 BC22 (arc=94 days, H=19.8 ~371m) from CSS (April 14.26-27p2)
K07A12E 2007 AE12 (arc=4 opp, H=19.7 ~389m) from Rob Matson using the Siding Spring Digitized Sky Survey (1995 May 29.42p1 & 1995 May 29.47p1)
K05N07B 2005 NB7 (arc=3 opp, H=18.7 ~616m) from Balzaretto Obs. (April 13.82-84p7)
K04H00W 2004 HW (Q=4.400 AU, arc=3 opp, H=17.2 ~1.23 km) from MLS (April 12.15-17p4 at V=20.6-22.5)
K02F05W 2002 FW5 (i=46.4°, arc=3 opp, H=19.3 ~467m) from LINEAR (April 14.24-29p5)
K01H07Y 2001 HY7 (arc=4 opp, H=20.5 ~269m) from CSS (April 14.41-42p4)
J99T10A 1999 TA10 (arc=3 opp, H=18.0 ~851m) from LINEAR (April 14.19-23p3)
G4202 164202 2004 EW from CSS (April 14.26-28p4)
F4988 154988 2004 XN35 from CSS (April 14.19-21p4)
D7170 137170 1999 HF1 from Ondrejov Obs. (April 13.02-12p6 & 13.89-12p12) and LINEAR (April 14.36-40p5)
86667 86667 2000 FO10 from LINEAR (April 14.29-34p5) and CSS (April 14.31-33p4)
68278 68278 2001 FC7 from LINEAR (April 14.35-39p5)
53435 53435 1999 VM40 from Spacewatch 0.9m (April 14.32-35p3)
09400 9400 1994 TW1 from LINEAR (April 14.24-28p5) and CSS (April 14.26-27p4)
05836 5836 1993 MF from LINEAR (April 14.24-29p5)
05626 5626 1991 FE from LINEAR (April 14.30-34p3)
04503 4503 Cleobulus (1989 WM) from Spacewatch 0.9m (April 14.25-29p3), LINEAR (April 14.30-34p5), and CSS (April 14.37-40p4)

Observers on 15 April '08

Sixteen observing facilities appear in today's MPECs.

Code	Observer / observatory
`251`	Arecibo in Puerto Rico, 1 in radar -- 2005 NB7
`H55`	Astronomical Research Obs. (ARO) in Illinois, 7 in MPECs 2008-G83, 2008-G84, 2008-G86, 2008-G88, 2008-G89, 2008-G90 & 2008-G91 -- 2008 GJ110, 2008 GH110, 2008 GF110, 2008 GE110, 2008 GC110, 2008 GB4, 2008 GA110
`A81`	Balzaretto Obs. in Italy, 1 in MPEC 2008-G83 -- 2005 NB7
`703`	Catalina Sky Survey (CSS) in Arizona, 12 in MPECs 2008-G83, 2008-G87 & 2008-G91 -- 2008 GP20, 2008 GJ110, 2008 GD110, 2008 EC69, 2008 BC22, 2001 HY7, 1998 KG3, 86667, 164202, 154988, 9400, 4503
`448`	Desert Moon Obs. in New Mexico, 2 in MPECs 2008-G86 & 2008-G90 -- 2008 GH110, 2008 GC110
`734`	Farpoint Obs. in Kansas, 2 in MPECs 2008-G84 & 2008-G86 -- 2008 GC110, 2008 GA110
`H51`	Greiner Research Obs. in Wisconsin, 1 in MPEC 2008-G91 -- 2008 GJ110
`704`	LINEAR in New Mexico, 12 in MPECs 2008-G83 & 2008-G85 -- 2008 GB110, 2008 EM9, 2002 FW5, 1999 TA10, 1998 KG3, 86667, 68278, 137170, 9400, 5836, 5626, 4503
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2008-G83, 2008-G85, 2008-G86, 2008-G88, 2008-G89 & 2008-G90 -- 2008 GH110, 2008 GF110, 2008 GE110, 2008 GC110, 2008 GB110, 2008 EE9, 2004 HW
`557`	Ondrejov Obs. in the Czech Republic, 1 in MPEC 2008-G83 -- 137170
`649`	Powell Obs. in Kansas, 3 in MPEC 2008-G83 -- 2008 GW20, 2008 GP20, 2008 GB21
`D90.`	Cristovao Jacques in Brazil via RAS Obs. Moorook in South Australia, 1 in MPEC 2008-G87 -- 2008 GD110
`854`	Sabino Canyon Obs. in Arizona, 4 in MPECs 2008-G85, 2008-G87, 2008-G90 & 2008-G91 -- 2008 GJ110, 2008 GH110, 2008 GD110, 2008 GB110
`260&`	Rob Matson in southern California using the Siding Spring Digitized Sky Survey in New South Wales, 1 in MPEC 2008-G83 -- 2007 AE12
`691`	Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2008-G83, 2008-G84 & 2008-G86 -- 2008 GC110, 2008 GA4, 2008 GA110, 53435, 4503
`291`	Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2008-G83, 2008-G84, 2008-G86 & 2008-G88 -- 2008 GM2, 2008 GE110, 2008 GC110, 2008 GA4, 2008 GA110, 2008 FT6

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

Impact Risk Monitoring on 15 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 GH110	JPL Sentry	2201	2024-2107	26	1.2e-08	-5.25	-5.94	0	JPL: "Analysis based on 16 observations spanning .89806 days (2008-Apr-14.46285 to 2008-Apr-15.36091)." Diameter approximately 0.330 km. from mean, weighted H=20.0.

2008 GD110	JPL Sentry	2201	2042-2097	25	5.7e-06	-5.19	-5.89	0	JPL: "Analysis based on 14 observations spanning 1.1658 days (2008-Apr-14.28705 to 2008-Apr-15.45285)." Diameter approximately 0.043 km. from mean, weighted H=24.5.

2008 GA110	JPL Sentry	2201	2105	1	1.8e-10	-8.59	-8.59	0	JPL: "Analysis based on 18 observations spanning .99783 days (2008-Apr-14.19339 to 2008-Apr-15.191224)." Diameter approximately 0.140 km. from mean, weighted H=21.9.

2008 GY21	NEODyS	1408	2038-2086	11	9.22e-08	-8.30	-8.77	0	NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2008/04/13.269 to 2008/04/14.327."

2008 GM2	NEODyS	1408	2063-2090	12	9.55e-07	-8.00	-8.30	0	NEODyS: "Based on 54 optical observations (of which 0 are rejected as outliers) from 2008/04/06.414 to 2008/04/14.259."
2008 GM2	JPL Sentry	1407	2063-2108	43	1.8e-05	-6.82	-7.50	0	JPL: "Analysis based on 54 observations spanning 7.8454 days (2008-Apr-06.41278 to 2008-Apr-14.25814)." Diameter approximately 0.007 km. from mean, weighted H=28.4.

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 15 April '08

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

2354	Noted Radar Astrometry database addition - see above
2201	Noted that JPL Sentry has posted 2008 GA110 as an impact risk - see above Noted that JPL Sentry has posted 2008 GD110 as an impact risk - see above Noted that JPL Sentry has posted 2008 GH110 as an impact risk - see above
1948	Grabbed MPEC 2008-G84 - 2008 GA110 - see above Grabbed MPEC 2008-G85 - 2008 GB110 - see above Grabbed MPEC 2008-G86 - 2008 GC110 - see above Grabbed MPEC 2008-G87 - 2008 GD110 - see above Grabbed MPEC 2008-G88 - 2008 GE110 - see above Grabbed MPEC 2008-G89 - 2008 GF110 - see above Grabbed MPEC 2008-G90 - 2008 GH110 - see above Grabbed MPEC 2008-G91 - 2008 GJ110 - see above
1408	Noted that NEODyS has updated its 2008 GM2 risk assessment - see above Grabbed MPEC 2008-G83 - Daily Orbit Update - see above
1407	Noted that JPL Sentry has updated its 2008 GM2 risk assessment - see above Noted that NEODyS has posted 2008 GY21 as an impact risk - see above

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