Contents  on 23 September '12

Asteroid/Comet Connection (A/CC) Resources:

The latest A/CC news is available via framed access, RSS news feed 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.

Traffic Report  on 23 September '12

One object reported inside ten LD

There is one asteroid reported flying within ten lunar distances (LD) of Earth today. 2012 RK15 is inbound from 9.97 to 8.50 LD. The next object known to approach this close is 2010 JK1, which arrives inside ten LD on November 22nd.

This report was generated at 1618 UTC with follow-up in today's DOU MPEC for departed 2012 SB3, 2012 SZ2, and 2012 RR16.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Object distances are interpreted by A/CC from JPL Horizons data. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 23 September '12

The MPC's NEO Confirmation Page has 15 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fifteen objects listed. Of these, two were "one nighters." So far The Tracking News has counted a total of eighteen listings on the NEOCP today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs  on 23 September '12

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2012-S56 - "18:47 UT" - 2005 CZ6 = 2012 SO30

<< DOU on 23 Sept. '12 >>  MPEC 2012-S55 - "06:02 UT" - Daily Orbit Update

MPEC 2012-S54 - "03:47 UT" - 2012 SO30

MPEC 2012-S53 - "03:45 UT" - 2012 SN30

Observers  on 23 September '12

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
169Airali Obs. in Italy, 1 in MPEC 2012-S55 -- 276397
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPECs 2012-S53 & 2012-S54 -- 2012 SO30, 2012 SN30
703Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2012-S55 -- 2012 LU7, 1994 EK, 335746, 108906
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPEC 2012-S55 -- 2012 SZ2, 2012 SX20, 2012 SD22, 2012 RV16, 2012 RL2, 2012 RJ15, 2012 RF15, 2012 RB3, 2012 QQ10, 2012 KJ18, 2012 FM52
448Desert Moon Obs. in New Mexico, 3 in MPEC 2012-S55 -- 333311, 275611, 159635
J95Great Shefford Obs. in England, 2 in MPECs 2012-S53 & 2012-S54 -- 2012 SO30, 2012 SN30
704LINEAR in New Mexico, 10 in MPEC 2012-S55 -- 2012 SW20, 2012 RR16, 2012 QJ2, 2008 SS251, 2005 ST1, 334412, 159635, 112985, 7350, 4587
A14Les Engarouines Obs. in France, 1 in MPEC 2012-S55 -- 2012 QY14
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2012-S53, 2012-S54 & 2012-S55 -- 2012 SO30, 2012 SN30, 2012 QK45, 2012 PB20
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-S55 -- 308043
118Modra Obs. in Slovakia, 1 in MPEC 2012-S53 -- 2012 SN30
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2012-S53, 2012-S54 & 2012-S55 -- 2012 SY20, 2012 SO30, 2012 SN30, 2012 RJ15
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2012-S53 -- 2012 SN30
H36Sandlot Obs. in Kansas, 2 in MPECs 2012-S53 & 2012-S54 -- 2012 SO30, 2012 SN30
033Schwarzschild Obs. in Germany, 6 in MPECs 2012-S53, 2012-S54 & 2012-S55 -- 2012 SO30, 2012 SN30, 2012 QJ2, 2012 PP28, 2012 PM28, 2012 PK24
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2012-S55 -- 2008 SS251
291Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2012-S53, 2012-S54 & 2012-S55 -- 2012 SV20, 2012 SO30, 2012 SN30, 2012 SB3, 2012 RG3, 2008 XO2
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2012-S53 -- 2012 SN30
954Teide Obs. in the Canary Islands, 1 in MPEC 2012-S53 -- 2012 SN30
718Wiggins Obs. in Utah, 1 in MPEC 2012-S55 -- 2012 SK8
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 September '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 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.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few special objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON2 risk pages.





Notes for Today's Latest Risk Assessments
2012 PK24JPL Sentry16162051-205942.1e-07-5.95-6.310JPL: "Analysis based on 69 observations spanning 33.752 days (2012-Aug-13.41356 to 2012-Sep-16.16533)." Diameter approximately 0.063 km. from mean, weighted H=23.6.
2012 PB20JPL Sentry16162066-2112108.4e-06-5.47-6.010JPL: "Analysis based on 43 observations spanning 38.814 days (2012-Aug-14.48152 to 2012-Sep-22.29529)." Diameter approximately 0.036 km. from mean, weighted H=24.9.
NEODyS16162067-2099161.87e-06-6.04-6.210NEODyS: "Based on 43 optical observations (of which 0 are rejected as outliers) from 2012-08-14.482 to 2012-09-22.296."

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 23 September '12

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

2009Grabbed MPEC 2012-S56 - 2005 CZ6 = 2012 SO30 - see above
1618Generated Traffic Report
1616Noted that JPL Sentry has updated its 2012 PB20 risk assessment - see above
Noted that NEODyS has updated its 2012 PB20 risk assessment - see above
Noted that JPL Sentry has updated its 2012 PK24 risk assessment - see above
Grabbed MPEC 2012-S55 - Daily Orbit Update - see above
0437Grabbed MPEC 2012-S53 - 2012 SN30 - see above
Grabbed MPEC 2012-S54 - 2012 SO30 - see above