Contents  on 19 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 19 September '12

Two objects reported inside ten LD

Two objects are reported traveling inside ten lunar distances (LD) of Earth today. Within Earth's Hill sphere, 2012 SW2 comes its closest to Earth on this passage, reaching 1.83 LD at 1419 UTC, and its closest to the Moon -- 1.97 LD at 1658 UTC. Out further, 2012 SZ2 comes its closest to Earth this time around, coming to 8.20 LD at 1959 UTC.

Coming toward Earth next, 2012 RK15 arrives inside ten LD on September 22nd and 2010 JK1 arrives on November 22nd.

This report was generated at 1617 UTC with follow-up in today's DOU MPEC for 2012 SW2 and 2012 RJ10.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Earth's Hill sphere (of gravitational influence) is estimated to extend out to around 3.89 LD. 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 19 September '12

The MPC's NEO Confirmation Page has 17 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seventeen objects listed. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 28 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 19 September '12

Minor Planet Electronic Circulars

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

MPEC 2012-S37 - "18:50 UT" - 2005 HM3

MPEC 2012-S36 - "17:00 UT" - 2012 SM8

MPEC 2012-S35 - "16:33 UT" - 2012 SL8

MPEC 2012-S34 - "16:30 UT" - 2012 SK8

MPEC 2012-S33 - "16:12 UT" - 2007 XF25

<< DOU on 19 Sept. '12 >>  MPEC 2012-S32 - "06:02 UT" - Daily Orbit Update

Observers  on 19 September '12

A total of 29 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPECs 2012-S33, 2012-S34, 2012-S35, 2012-S36 & 2012-S37 -- 2012 SM8, 2012 SL8, 2012 SK8, 2007 XF25, 2005 HM3
I74Baxter Garden Obs. in England, 2 in MPEC 2012-S32 -- 2012 QB17, 153415
160Castelmartini Obs. in Italy, 3 in MPEC 2012-S32 -- 2012 LE11, 2012 HO15, 2005 UC
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2012-S32 -- 2012 RP15, 2009 SO103, 2009 DK46, 2009 BD2, 331963, 112221
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2012-S34 -- 2012 SK8
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2012-S32 -- 2012 QE50
F658David Tholen's team in Hawaii via Faulkes Telescope North in Hawaii, 2 in MPEC 2012-S32 -- 2012 PG6, 265962
J95Great Shefford Obs. in England, 3 in MPECs 2012-S32, 2012-S34 & 2012-S36 -- 2012 SW2, 2012 SM8, 2012 SK8
D19Hong Kong Space Museum Obs. in Hong Kong, 2 in MPEC 2012-S32 -- 2012 QP17, 2012 LU7
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2012-S32 -- 2007 RT19
D00ISON-Kislovodsk Obs., 1 in MPEC 2012-S32 -- 2002 TY68
704LINEAR in New Mexico, 7 in MPECs 2012-S32 & 2012-S34 -- 2012 SK8, 2012 HO15, 2006 WN1, 2000 RH60, 334412, 5143, 2212
A14Les Engarouines Obs. in France, 1 in MPEC 2012-S32 -- 2012 QY14
H01Magdalena Ridge Obs. (MRO) in New Mexico, 5 in MPECs 2012-S32, 2012-S34, 2012-S35 & 2012-S36 -- 2012 SM8, 2012 SL8, 2012 SK8, 2012 RU16, 2012 RJ10
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-S32 -- 2012 MQ
711McDonald Obs. in Texas, 2 in MPECs 2012-S32 & 2012-S35 -- 2012 SX2, 2012 SL8
474Mt. John Obs. in New Zealand, 1 in MPEC 2012-S35 -- 2012 SL8
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2012-S32, 2012-S35 & 2012-S36 -- 2012 SM8, 2012 SL8, 2012 PS17, 2000 RH60, 96189, 277127, 207970
J93Mt. Tuffley Obs. in England, 2 in MPEC 2012-S32 -- 276397, 214869
A24New Millennium Obs. in Italy, 17 in MPEC 2012-S32 -- 2012 QO10, 2012 QB17, 2012 PS17, 2000 RN77, 335746, 333889, 333358, 333284, 331963, 329340, 20460, 138847, 105140, 9202, 8035, 4947, 4487
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-S36 -- 2012 SM8
204Schiaparelli Obs. in Italy, 1 in MPEC 2012-S35 -- 2012 SL8
645Sloan Digital Sky Survey (SDSS) in New Mexico, 2 in MPEC 2012-S32 -- 328059, 306462
J84South Obs. in England, 1 in MPEC 2012-S32 -- 214869
J26Spaceguard Centre in Wales, 1 in MPEC 2012-S32 -- 4487
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2012-S32 -- 2008 SS251, 334412
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2012-S32, 2012-S35 & 2012-S36 -- 2012 SM8, 2012 SL8, 2012 RO1, 2012 RG3, 2012 QY14, 2012 QK14, 2012 QF42, 2010 OB101, 2008 EZ97
954Teide Obs. in the Canary Islands, 1 in MPEC 2012-S34 -- 2012 SK8
718Wiggins Obs. in Utah, 1 in MPEC 2012-S34 -- 2012 SK8
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 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 RU16JPL Sentry1614203613.0e-08-7.47-7.470JPL: "Analysis based on 30 observations spanning 3.0802 days (2012-Sep-15.34955 to 2012-Sep-18.4297)." Diameter approximately 0.026 km. from mean, weighted H=25.6.
NEODyS16142089-208911.07e-06-6.53-6.530NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2012-09-15.350 to 2012-09-18.430."
2012 RJ10JPL Sentry1614208913.5e-08-7.70-7.690JPL: "Analysis based on 32 observations spanning 5.1677 days (2012-Sep-13.26348 to 2012-Sep-18.43117)." Diameter approximately 0.029 km. from mean, weighted H=25.3.

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 19 September '12

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

1929Grabbed MPEC 2012-S37 - 2005 HM3 - see above
1702Grabbed MPEC 2012-S34 - 2012 SK8 - see above
Grabbed MPEC 2012-S35 - 2012 SL8 - see above
Grabbed MPEC 2012-S36 - 2012 SM8 - see above
1617Generated Traffic Report
1614Noted 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
Grabbed MPEC 2012-S32 - Daily Orbit Update - see above
Grabbed MPEC 2012-S33 - 2007 XF25 - see above