Contents  on 22 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 22 September '12

Three objects reported inside ten LD

Three visitors are reported traveling within ten lunar distances (LD) of our planet today. Two depart from inside ten LD -- 2012 SW2 passing from 8.92 to 12.50 LD and 2012 SZ2 from 9.71 to 11.19 LD, while 2012 RK15 enters the "bubble," moving from 12.22 to 9.98 LD.

Coming toward Earth next, 2010 JK1 arrives inside ten LD on November 22nd.

This report was generated at 1518 UTC with follow-up in today's DOU MPEC for 2012 SZ2 and 2012 RK15 and for departed 2012 SU9, 2012 SB3, 2012 RT16, 2012 RR16, 2012 RM15, 2012 RJ10, and 2012 QG42.

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 22 September '12

The MPC's NEO Confirmation Page has 13 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had thirteen objects listed. Of these, seven 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 22 September '12

Minor Planet Electronic Circulars

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

<< DOU on 22 Sept. '12 >>  MPEC 2012-S52 - "06:02 UT" - Daily Orbit Update

Observers  on 22 September '12

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

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 3 in MPEC 2012-S52 -- 2012 QE50, 2012 QB17, 219071
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPEC 2012-S52 -- 2012 SY2, 2012 SX2, 2012 ST9, 2012 SM8, 2012 SK8, 2012 RX16, 2012 RW16, 2012 RJ10, 2012 RH15, 2012 RH10, 2012 PO17, 2012 PN, 2008 JQ14, 2006 PW, 189865
I74Baxter Garden Obs. in England, 3 in MPEC 2012-S52 -- 2012 SW20, 153415, 143649
703Catalina Sky Survey (CSS) in Arizona, 10 in MPEC 2012-S52 -- 2012 QB17, 2008 SS251, 333889, 214869, 192642, 162900, 155340, 138847, 5143, 4587
924Cegep de Trois-Rivieres Obs. in Quebec, 1 in MPEC 2012-S52 -- 2012 SW20
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 12 in MPEC 2012-S52 -- 2012 SZ2, 2012 SX20, 2012 RM15, 2012 RL15, 2012 RK15, 2012 RG15, 2012 RF15, 2012 QH8, 2012 OZ, 2012 KK18, 2005 NK1, 105141
448Desert Moon Obs. in New Mexico, 3 in MPEC 2012-S52 -- 2001 WL15, 326732, 8035
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2012-S52 -- 2012 SW20
704LINEAR in New Mexico, 8 in MPEC 2012-S52 -- 2012 SW20, 2012 RX16, 2012 QP17, 2009 BD2, 2005 ST1, 2000 SD8, 6047, 887
C94MASTER-II Obs. Tunka in Russia, 1 in MPEC 2012-S52 -- 2007 RT19
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPEC 2012-S52 -- 2012 RJ10, 2012 PB20
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-S52 -- 2012 PB20
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPEC 2012-S52 -- 2012 SB3, 2012 RM2, 2012 QJ2, 2012 PJ6, 2008 EO6, 106589
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 8 in MPEC 2012-S52 -- 2012 SK8, 2012 RR16, 2012 QO10, 2012 QE50, 2012 QB17, 2012 PS17, 2012 LE11, 2005 UC
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 2 in MPEC 2012-S52 -- 2012 SW20, 2012 SD22
104San Marcello Pistoiese Obs. in Italy, 2 in MPEC 2012-S52 -- 2012 SM8, 2012 RW16
033Schwarzschild Obs. in Germany, 30 in MPEC 2012-S52 -- 2012 SX2, 2012 SM8, 2012 SA3, 2012 RW16, 2012 RU16, 2012 RT16, 2012 RS16, 2012 RR16, 2012 RP15, 2012 RO15, 2012 RN15, 2012 RM2, 2012 RL15, 2012 RJ15, 2012 RJ10, 2012 RH3, 2012 RH15, 2012 RH10, 2012 RG15, 2012 QG49, 2012 QG42, 2012 PW, 2012 PA20, 2012 MV4, 2012 LK11, 2012 EC, 2011 UG21, 2009 TB3, 2004 RX10, 2002 PC11
C24Seveso Obs., 1 in MPEC 2012-S52 -- 2012 QE50
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2012-S52 -- 2012 ES14
291Spacewatch 1.8m telescope in Arizona, 13 in MPEC 2012-S52 -- 2012 SW20, 2012 SU9, 2012 ST9, 2012 RU16, 2012 RG3, 2012 RG15, 2012 QK14, 2012 QF42, 2010 OD101, 2010 HQ80, 2010 AE, 2009 TC8, 2004 CH52
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 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 SW20JPL Sentry1517R E M O V E DJPL: Risk listing removed at 0932 UTC.
2012 SU9JPL Sentry15172100-211141.3e-06-7.29-7.330JPL: "Analysis based on 30 observations spanning 2.9409 days (2012-Sep-19.22484 to 2012-Sep-22.16573)." Diameter approximately 0.012 km. from mean, weighted H=27.2.
NEODyS15172091-210033.72e-08-8.76-8.820NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2012-09-19.226 to 2012-09-22.167."
2012 RU16JPL Sentry15172032-210641.1e-06-6.49-6.760JPL: "Analysis based on 46 observations spanning 6.8304 days (2012-Sep-15.34955 to 2012-Sep-22.17994)." Diameter approximately 0.025 km. from mean, weighted H=25.7.
NEODyS15172032-208941.84e-07-7.07-7.460NEODyS: "Based on 46 optical observations (of which 0 are rejected as outliers) from 2012-09-15.350 to 2012-09-22.181."
2012 RJ10JPL Sentry1517208911.4e-09-9.10-9.100JPL: "Analysis based on 50 observations spanning 8.9630 days (2012-Sep-13.26348 to 2012-Sep-22.22644)." Diameter approximately 0.028 km. from mean, weighted H=25.4.
2012 PB20JPL Sentry15172066-211281.1e-05-5.32-5.840JPL: "Analysis based on 39 observations spanning 37.795 days (2012-Aug-14.48152 to 2012-Sep-21.27622)." Diameter approximately 0.037 km. from mean, weighted H=24.8.
NEODyS15172070-2099112.75e-06-5.88-5.970NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2012-08-14.482 to 2012-09-21.277."

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 22 September '12

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

1518Generated Traffic Report
1517Noted 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 RJ10 risk assessment - see above
Noted that JPL Sentry has updated its 2012 RU16 risk assessment - see above
Noted that NEODyS has updated its 2012 RU16 risk assessment - see above
Noted that JPL Sentry has updated its 2012 SU9 risk assessment - see above
Noted that NEODyS has updated its 2012 SU9 risk assessment - see above
Noted that JPL Sentry has removed 2012 SW20 as an impact risk - see above
Grabbed MPEC 2012-S52 - Daily Orbit Update - see above