2008-04-25 Tracking News

Contents on 25 April '08

IAU Minor Planet Center
- NEOCP Activity -- one listing: 1 updated
- New MPECs -- three MPECs
Observers -- seventeen observing facilities
Impact Risk Monitoring -- six 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

NOTE: The Tracking News and this Web site will be updating less often, and at sometimes irregular intervals, for the rest of April.

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 25 April '08

The MPC's NEO Confirmation Page has 1 listing: 1 updated

When last checked at 2314 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one updated listing. This was a "one nighter." So far The Tracking News has counted a total of three 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 25 April '08

Minor Planet Electronic Circulars

As of last check at 2314 UTC, there have been three MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-H25 time-stamped "06:06 UT" - Daily Orbit Update - see below
MPEC 2008-H26 time-stamped "20:51 UT" - 2008 HJ - see below
MPEC 2008-H27 time-stamped "20:57 UT" - 2008 HK

MPEC 2008-H27 - "20:57 UT" - 2008 HK

K08H00K 2008 HK (small asteroid, H=22.3 ~117m) was discovered at 0624 UT on 25 April by the Catalina Sky Survey (CSS), which observed it at April 25.27-37p16. The discovery was confirmed by Sabino Canyon Obs. (April 25.34-35p3), Farra d'Isonzo Obs. (April 25.79-81p3), Wildberg Obs. (April 25.83-84p5), and Remanzacco Obs. (April 25.84p3).

MPEC 2008-H26 - "20:51 UT" - 2008 HJ

K08H00J 2008 HJ (risk-listed, Earth MOID=0.7 LD, H=25.6 ~26m) was discovered at 0556 UT on 24 April by LINEAR, which observed it at April 24.25-29p5. The discovery was confirmed by the Mt. Lemmon Survey (MLS) (April 25.29p4), Sabino Canyon Obs. (April 25.33p4), Bisei Spaceguard Center (April 25.65-68p5), Farra d'Isonzo Obs. (April 25.80-81p3), and Remanzacco Obs. (April 25.81p2). This object is now within ten lunar distances (LD) of Earth, reaching 2.8 LD on 30 April.

<< DOU on 25 Apr. '08 >> MPEC 2008-H25 - "06:06 UT" - Daily Orbit Update

Observations of risk-listed objects
K08H00H 2008 HH (almost small, arc=0 days, H=21.9 ~141m) from the FTP education program via Faulkes Telescope North (April 24.57-58p2)
K08H00G 2008 HG (small asteroid, arc=0 days, H=23.5 ~68m) from LINEAR (April 24.25-34p9), Tiki Obs. (April 24.51-55p3), and FTP educ. prog. (April 24.57-58p2)
K08H00E 2008 HE (q=0.112 AU, Q=4.884 AU, arc=7 days, H=17.9 ~891m) from Desert Moon Obs. (April 24.11-13p3), LINEAR (April 24.16-19p4), Alter Satzberg Obs. (April 24.85-87p3), and the Spacewatch 1.8m telescope (April 25.13-14p3)
K08E07R 2008 ER7 (arc=49 days, H=20.0 ~339m) from Astronomical Research Obs. (ARO) (April 24.12-14p3 at V=22.6-7)
Observations of recently (no longer) risk-listed objects
K08GB0H 2008 GH110 (arc=10 days, H=19.8 ~371m) from ARO (April 23.29-30p3) and Desert Moon Obs. (April 24.44-47p3)
K08GB0A 2008 GA110 (almost small, Q=4.516 AU, arc=10 days, H=21.9 ~141m) from ARO (April 23.29-31p3) and Spacewatch 1.8m (April 24.25p3)
K08G20O 2008 GO20 (small asteroid, arc=15 days, H=22.3 ~117m) from ARO (April 24.19-21p3) and Spacewatch 1.8m (April 24.37p3)
K08G03R 2008 GR3 (small asteroid, arc=17 days, H=25.1 ~32m) from Spacewatch 1.8m (April 24.30-31p3)
K08G00F 2008 GF (arc=22 days, H=20.6 ~257m) from ARO (April 23.15-17p3)
K08F00N 2008 FN (i=44.7°, arc=2 opp, H=18.5 ~676m) from MLS (April 24.31-32p4)
Observations of small asteroids (H>22.0)
K08GB0C 2008 GC110 (arc=10 days, H=22.4 ~112m) from ARO (April 23.31-33p3), Spacewatch 1.8m (April 24.23-24p3), and Desert Moon Obs. (April 24.25-28p3)
K08G20U 2008 GU20 (arc=13 days, H=23.1 ~81m) from Tiki Obs. (April 24.38p1 & 24.42-45p2)
K08G03S 2008 GS3 (arc=17 days, H=22.1 ~129m) from ARO (April 23.26-28p3) and Spacewatch 1.8m (April 24.38-39p3)
K08G02G 2008 GG2 (arc=19 days, H=23.1 ~81m) from Spacewatch 1.8m (April 24.39-40p3)
K08G00E 2008 GE (arc=23 days, H=23.3 ~74m) from ARO (April 24.15-17p3) and Spacewatch 1.8m (April 24.35-36p3)
K08E07Q 2008 EQ7 (arc=50 days, H=22.6 ~102m) from Wildberg Obs. (April 25.01-02p3)
J98K03G 1998 KG3 (arc=3 opp, H=22.3 ~117m) from CSS (April 24.33-35p4)
Observations of almost-small asteroids (21.7<H<=22.0)
K08GB0E 2008 GE110 (arc=10 days, H=22.0 ~135m) from ARO (April 23.21-22p3)
Observations of other objects
K08GB0J 2008 GJ110 (q=0.279 AU, arc=9 days, H=20.5 ~269m) from ARO (April 23.20-21p3 & 24.19-21p3) and Desert Moon Obs. (April 24.19-22p3)
K08GB0B 2008 GB110 (i=36.3°, arc=8 days, H=19.7 ~389m) from Desert Moon Obs. (April 22.24p1)
K08G20V 2008 GV20 (arc=13 days, H=18.6 ~645m) from Spacewatch 1.8m (April 24.26-27p3)
K08G04A 2008 GA4 (arc=16 days, H=19.3 ~467m) from MLS (April 24.29-30p4), Spacewatch 1.8m (April 24.29-30p3), and Desert Moon Obs. (April 24.34-40p3)
K08G03V 2008 GV3 (i=72.9°, arc=18 days, H=18.6 ~645m) from Verona Obs. (April 24.89-90p4)
K08G01E 2008 GE1 (arc=20 days, H=19.3 ~467m) from Spacewatch 1.8m (April 24.28p2)
K08F06N 2008 FN6 (arc=26 days, H=21.3 ~186m) from LINEAR (April 24.29-34p4), Desert Moon Obs. (April 24.30-31p3), CSS (April 24.39-41p4), and Wildberg Obs. (April 24.00p4)
K08F00G 2008 FG (i=39.3°, arc=29 days, H=19.8 ~371m) from Spacewatch 1.8m (April 25.17-18p3)
K08E69C 2008 EC69 (Q=4.456 AU, arc=67 days, H=17.1 ~1.29 km) from Remanzacco Obs. (April 25.01-02p3)
K08E09M 2008 EM9 (q=0.291 AU, arc=44 days, H=17.4 ~1.12 km) from ARO (April 23.18-20p3)
K08D00W 2008 DW (arc=58 days, H=21.5 ~170m) from ARO (April 23.23-25p3) and Spacewatch 1.8m (April 24.34-35p3)
K08D00J 2008 DJ (arc=59 days, H=20.5 ~269m) from ARO (April 24.09-11p3 at V=22.3-4)
K08D00E 2008 DE (arc=73 days, H=19.5 ~426m) from Verona Obs. (April 24.96-97p4)
K08C22B 2008 CB22 (arc=77 days, H=19.7 ~389m) from Spacewatch 1.8m (April 25.18-19p3 at V=21.9-22.3)
K07V04Q 2007 VQ4 (arc=3 opp, H=15.9 ~2.24 km, q=1.271 AU) from Verona Obs. (April 24.93-94p4)
K06U00A 2006 UA (arc=2 opp, H=20.1 ~323m) from Desert Moon Obs. (April 24.15-17p3), LINEAR (April 24.20-24p5), and CSS (April 24.22-24p4)
K05N07B 2005 NB7 (arc=3 opp, H=18.7 ~616m) from Petit Jean Mtn. South Obs. (PJMSO) (April 25.22-23p7)
K04J01Q 2004 JQ1 (arc=3 opp, H=20.1 ~323m) from Spacewatch 1.8m (April 24.45p2)
K04F31E 2004 FE31 (arc=4 opp, H=18.1 ~812m) from MLS (April 24.24-25p4)
K04C02R 2004 CR2 (arc=2 opp, H=19.2 ~490m) from LINEAR (April 24.19-24p5)
K03K02O 2003 KO2 (q=0.356 AU, arc=4 opp, H=20.1 ~323m) from Spacewatch 1.8m (April 24.42-43p3)
K03G00W 2003 GW (i=49.4°, arc=3 opp, H=16.7 ~1.55 km) from PJMSO (April 25.20-21p5)
K02R25U 2002 RU25 (arc=3 opp, H=17.4 ~1.12 km) from MLS (April 24.18-20p4)
K00DA7P 2000 DP107 (arc=6 opp, H=18.2 ~776m) from CSS (April 24.20-21p3)
I4266 184266 2004 VW14 from PJMSO (April 25.23-24p5)
H0891 170891 2004 TY16 from Wildberg Obs. (April 24.82-84p4)
F2942 152942 2000 FN10 from PJMSO (April 25.19-20p6)
F2679 152679 1998 KU2 from the Spacewatch 0.9m telescope (April 24.14-18p3) and CSS (April 24.31-33p4)
D8205 138205 2000 EZ148 from CSS (April 24.22-24p4)
86667 86667 2000 FO10 from MLS (April 24.25-27p4) and CSS (April 24.30-32p4)
54789 54789 2001 MZ7 from LINEAR (April 24.42-45p4)
13553 13553 1992 JE from MLS (April 24.19-20p3), LINEAR (April 24.20-24p3), and CSS (April 24.25-27p4)
07822 7822 1991 CS from MLS (April 24.48-49p8)
01864 1864 Daedalus (1971 FA) from CSS (April 24.22-24p4)
01685 1685 Toro (1948 OA) from LINEAR (April 24.14-18p5)

Observers on 25 April '08

Seventeen observing facilities appear in today's MPECs.

Code	Observer / observatory
`B03`	Alter Satzberg Obs. in Austria, 1 in MPEC 2008-H25 -- 2008 HE
`H55`	Astronomical Research Obs. (ARO) in Illinois, 13 in MPEC 2008-H25 -- 2008 GS3, 2008 GO20, 2008 GJ110, 2008 GH110, 2008 GF, 2008 GE110, 2008 GE, 2008 GC110, 2008 GA110, 2008 ER7, 2008 EM9, 2008 DW, 2008 DJ
`300`	Bisei Spaceguard Center in Japan, 1 in MPEC 2008-H26 -- 2008 HJ
`703`	Catalina Sky Survey (CSS) in Arizona, 10 in MPECs 2008-H25 & 2008-H27 -- 2008 HK, 2008 FN6, 2006 UA, 2000 DP107, 1998 KG3, 86667, 152679, 138205, 13553, 1864
`448`	Desert Moon Obs. in New Mexico, 8 in MPEC 2008-H25 -- 2008 HE, 2008 GJ110, 2008 GH110, 2008 GC110, 2008 GB110, 2008 GA4, 2008 FN6, 2006 UA
`595`	Farra d'Isonzo Obs. in Italy, 2 in MPECs 2008-H26 & 2008-H27 -- 2008 HK, 2008 HJ
`F653`	FTP education program via Faulkes Telescope North in Hawaii, 2 in MPEC 2008-H25 -- 2008 HH, 2008 HG
`704`	LINEAR in New Mexico, 9 in MPECs 2008-H25 & 2008-H26 -- 2008 HJ, 2008 HG, 2008 HE, 2008 FN6, 2006 UA, 2004 CR2, 54789, 13553, 1685
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2008-H25 & 2008-H26 -- 2008 HJ, 2008 GA4, 2008 FN, 2004 FE31, 2002 RU25, 86667, 13553, 7822
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2008-H25 -- 2005 NB7, 2003 GW, 184266, 152942
`473`	Remanzacco Obs. in Italy, 3 in MPECs 2008-H25, 2008-H26 & 2008-H27 -- 2008 HK, 2008 HJ, 2008 EC69
`854`	Sabino Canyon Obs. in Arizona, 2 in MPECs 2008-H26 & 2008-H27 -- 2008 HK, 2008 HJ
`691`	Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2008-H25 -- 152679
`291`	Spacewatch 1.8m telescope in Arizona, 16 in MPEC 2008-H25 -- 2008 HE, 2008 GV20, 2008 GS3, 2008 GR3, 2008 GO20, 2008 GG2, 2008 GE1, 2008 GE, 2008 GC110, 2008 GA4, 2008 GA110, 2008 FG, 2008 DW, 2008 CB22, 2004 JQ1, 2003 KO2
`F85`	Tiki Obs. in Tahiti, 2 in MPEC 2008-H25 -- 2008 HG, 2008 GU20
`A48`	Verona Obs. in Italy, 3 in MPEC 2008-H25 -- 2008 GV3, 2008 DE, 2007 VQ4
`198`	Wildberg Obs. in Germany, 4 in MPECs 2008-H25 & 2008-H27 -- 2008 HK, 2008 FN6, 2008 EQ7, 170891

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

Impact Risk Monitoring on 25 April '08

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2314 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 HJ	JPL Sentry	2314	2071-2106	33	1.4e-04	-4.49	-5.15	0	JPL: "Analysis based on 23 observations spanning 1.5677 days (2008-Apr-24.24725 to 2008-Apr-25.81497)." Diameter approximately 0.027 km. from mean, weighted H=25.5.

2008 HH	NEODyS	2141	2010-2089	86	2.82e-08	-5.40	-6.02	0	NEODyS #2: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2008/04/24.309 to 2008/04/24.581."

2008 HG	JPL Sentry	2139	R E M O V E D						JPL: Risk listing removed at 1655 UTC.

2008 HE	NEODyS	1214	R E M O V E D						-

2008 ER7	JPL Sentry	2139	2077-2102	6	9.7e-07	-3.66	-4.08	0	JPL: "Analysis based on 90 observations spanning 48.805 days (2008-Mar-06.33608 to 2008-Apr-24.140763)." Diameter approximately 0.320 km. from mean, weighted H=20.1.
2008 ER7	NEODyS	1215	2073-2086	6	4.4e-07	-3.93	-4.14	0	NEODyS: "Based on 90 optical observations (of which 0 are rejected as outliers) from 2008/03/06.337 to 2008/04/24.142."

2007 VD8	JPL Sentry	2139	2023-2107	73	3.1e-07	-7.74	-8.69	0	JPL: "Analysis based on 11 observations spanning .11380 days (2007-Nov-05.31632 to 2007-Nov-05.43012)." Diameter approximately 0.010 km. from mean, weighted H=27.7.

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 25 April '08

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

2314	Noted that JPL Sentry has posted 2008 HJ as an impact risk - see above
2141	Noted that NEODyS has updated its 2008 HH risk assessment - see above
2139	Noted that JPL Sentry has updated its 2007 VD8 risk assessment - see above Noted that JPL Sentry has updated its 2008 ER7 risk assessment - see above Noted that JPL Sentry has removed 2008 HG as an impact risk - see above Grabbed MPEC 2008-H26 - 2008 HJ - see above Grabbed MPEC 2008-H27 - 2008 HK - see above
1215	Noted that NEODyS has updated its 2008 ER7 risk assessment - see above Grabbed MPEC 2008-H25 - Daily Orbit Update - see above
1214	Noted that NEODyS has removed 2008 HE as an impact risk - see above Noted that NEODyS has posted 2008 HH as an impact risk - see above The NEOCP has become active

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