24 Sep '07 Tracking News

Contents on 24 September '07

IAU Minor Planet Center
- NEOCP Activity -- one listing: 1 new
- New MPECs -- two MPECs
- Observers -- ten observing facilities
Impact Risk Monitoring -- three objects reported
Chronology

Resources:

Consolidated Risk Tables - CRT page
Ephemerides for risk-rated objects

Notes: Due to travel, these pages will update irregularly for the rest of the month.
Until September 16th this daily news page, which had included links to news and science papers as well as some occasional original reporting, was called Major News About Minor Objects. Without the news-link and science-link sections, this page was renamed as The Tracking News to more accurately reflect its continuing purpose.

The latest news: framed access (best), RSS news feed (flags updates), or redirection - Note: A/CC has a main Web site and a backup site.

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 this year 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 24 September '07

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

When last checked at 2021 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new listing. Tracking News counted a total of two objects listed on the NEOCP at some point on this day.

New MPECs on 24 September '07

Minor Planet Electronic Circulars

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

MPEC 2007-S46 time-stamped "06:10 UT" - Daily Orbit Update - see below
MPEC 2007-S47 time-stamped "17:04 UT" - 2007 SE11

MPEC 2007-S47 - "17:04 UT" - 2007 SE11

K07S11E 2007 SE11 (i=45.9°, H=17.7 ~977m) was discovered at 1748 UT 20 Sept. by the Siding Spring Survey (SSS), which observed it at Sept. 20.74-77p4, 21.64p2, and 22.76-77p2. The discovery was confirmed by CEAMIG-REA (Sept. 22.28p2) and Tiki Obs. (Sept. 23.49-53p3).

<< DOU on 24 Sept. '07 >> MPEC 2007-S46 - "06:10 UT" - Daily Orbit Update

Observations of risk-listed objects
K07S06Q 2007 SQ6 (arc=2 days, H=21.6 ~162m) from Remanzacco Obs. (Sept. 23.78-79p2) and Jim Young via Table Mtn. Obs. (Sept. 24.19p1)
K07S00J 2007 SJ (arc=6 days, H=16.2 ~1.95 km) from Astronomical Research Obs. (ARO) (Sept. 23.18p1)
Observations of recently (no longer) risk-listed objects
K07R09A 2007 RA9 (Q=4.033 AU, arc=13 days, H=19.9 ~355m) from Hibiscus Obs. (Sept. 22.59-62p3)
Observations of small asteroids (H>22.0)
K07R19Z 2007 RZ19 (arc=9 days, H=22.2 ~123m) from ARO (Sept. 23.34-35p3)
K07R12V 2007 RV12 (arc=11 days, H=25.6 ~26m) from ARO (Sept. 23.41-43p3 at V=22.1-2)
K07R01G 2007 RG1 (arc=20 days, H=25.8 ~23m) from ARO (Sept. 23.30-31p2)
K07P09Q 2007 PQ9 (arc=42 days, H=22.1 ~129m) from Hibiscus Obs. (Sept. 22.54-58p3)
Observations of other objects
K07R12R 2007 RR12 (arc=10 days, H=19.8 ~371m) from Stia Obs. (Sept. 21.86-87p4)
K07P11U 2007 PU11 (Q=4.384 AU, arc=3 opp, H=16.3 ~1.86 km) from New Millennium Obs. (Sept. 12.08-09p3)
K04E21T 2004 ET21 (i=41.6°, arc=2 opp, H=20.6 ~257m) from Tiki Obs. (Sept. 22.44-48p3)
K02S00V 2002 SV (arc=2 opp, H=19.8 ~371m) from Stia Obs. (Sept. 22.80-81p4)
J98S15D 1998 SD15 (arc=4 opp, H=19.1 ~513m) from Stia Obs. (Sept. 22.78-79p5) and Remanzacco Obs. (Sept. 23.82p3)
F2787 152787 1999 TB10 from Isle of Man Obs. (Sept. 21.97p4)

Observers on 24 September '07

Ten observing facilities appeared in this day's MPECs.

Code	Observer / observatory
`H55`	Astronomical Research Obs. in Illinois, 4 in MPEC 2007-S46 -- 2007 SJ, 2007 RZ19, 2007 RV12, 2007 RG1
`I77`	CEAMIG-REA in Brazil, 1 in MPEC 2007-S47 -- 2007 SE11
`F84`	Hibiscus Obs. in Tahiti, 2 in MPEC 2007-S46 -- 2007 RA9, 2007 PQ9
`987`	Isle of Man Obs. on the Isle of Man, 1 in MPEC 2007-S46 -- 152787
`A24`	New Millennium Obs. in Italy, 1 in MPEC 2007-S46 -- 2007 PU11
`473`	Remanzacco Obs. in Italy, 2 in MPEC 2007-S46 -- 2007 SQ6, 1998 SD15
`E12`	Siding Spring Survey in New South Wales, 1 in MPEC 2007-S47 -- 2007 SE11
`A78`	Stia Obs. in Italy, 3 in MPEC 2007-S46 -- 2007 RR12, 2002 SV, 1998 SD15
`6735`	Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2007-S46 -- 2007 SQ6
`F85`	Tiki Obs. in Tahiti, 2 in MPECs 2007-S46 & 2007-S47 -- 2007 SE11, 2004 ET21

Impact Risk Monitoring on 24 September '07

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2021 UTC)
See the CRT page for a list of all objects rated recently as risks.
Note that the time horizon for JPL is 100 years from today and for NEODyS is now 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

2007 SQ6	JPL	1333	R E M O V E D						JPL #2 for the day: Risk listing removed at 1029 UTC.

2007 SN6	NEODyS	1333	2022-2085	4	5.5e-06	-4.58	-4.62	0	NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2007/09/19.290 to 2007/09/23.357."
2007 SN6	JPL	0132	2022-2059	2	4.8e-06	-4.66	-4.71	0	JPL: "Analysis based on 15 observations spanning 4.0674 days (2007-Sep-19.28894 to 2007-Sep-23.35638)." Diameter approximately 0.036 km. from mean, weighted H=24.9.

2007 SJ	JPL	1333	2017-2105	46	5.8e-07	-1.83	-2.06	0	JPL: "Analysis based on 43 observations spanning 6.0011 days (2007-Sep-17.18208 to 2007-Sep-23.183194)." Diameter approximately 1.800 km. from mean, weighted H=16.4.
2007 SJ	NEODyS	1333	2014-2078	18	6.52e-07	-1.73	-2.15	0	NEODyS: "Based on 43 optical observations (of which 0 are rejected as outliers) from 2007/09/17.183 to 2007/09/23.184."

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 an 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" for more about this.

Chronology on 24 September '07

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

1706	Grabbed MPEC 2007-S47 - 2007 SE11 - see above
1333	Noted that JPL has updated its 2007 SJ risk assessment - see above Noted that NEODyS has updated its 2007 SJ risk assessment - see above Noted that NEODyS has posted 2007 SN6 as an impact risk - see above Noted that JPL has removed 2007 SQ6 as an impact risk - see above Grabbed MPEC 2007-S46 - Daily Orbit Update - see above
0132	Noted that JPL has posted 2007 SN6 as an impact risk - see above Noted that JPL has posted 2007 SQ6 as an impact risk - see above

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