Contents  on 25 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 25 September '12

Three objects reported inside ten LD

Three visitors are reported passing within ten lunar distances (LD) of our planet today. Risk-listed 2012 SY49 comes inside ten LD, traveling from 11.15 to 7.73 LD, newly announced 2012 SL50 is inbound from 6.89 to 4.56 LD, and 2012 RK15 is outbound from 8.22 to 9.26 LD.

No other objects are known to be coming this close until 2010 JK1 arrives inside ten LD on November 22nd.

This report was updated at 1848 UTC with new discovery 2012 SL50 (MPEC). Today's first traffic report was generated at 1620 UTC with follow-up in today's DOU MPEC for 2012 SY49 and departed 2012 RR16 [also 2012 SU9, not noted this day].

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 25 September '12

The MPC's NEO Confirmation Page has 9 listings

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

New MPECs  on 25 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-S73 - "16:34 UT" - 2012 SM50

MPEC 2012-S72 - "16:32 UT" - 2012 SL50

MPEC 2012-S71 - "16:29 UT" - 2012 SK50

MPEC 2012-S70 - "13:53 UT" - 2009 SQ104

<< DOU on 25 Sept. '12 >>  MPEC 2012-S69 - "06:02 UT" - Daily Orbit Update

MPEC 2012-S68 - "04:42 UT" - 2011 LX10

Observers  on 25 September '12

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 28 in MPECs 2012-S68, 2012-S69, 2012-S71, 2012-S72 & 2012-S73 -- 2012 SY2, 2012 SW20, 2012 SU9, 2012 ST9, 2012 SN30, 2012 SM8, 2012 SM50, 2012 SL50, 2012 SK8, 2012 SK50, 2012 SB22, 2012 RX16, 2012 RW16, 2012 RV16, 2012 RR16, 2012 RQ16, 2012 RO15, 2012 RH3, 2012 RH10, 2012 QY14, 2012 QF49, 2012 QF42, 2012 QE50, 2012 QB17, 2012 HN13, 2011 LX10, 2009 BJ81, 2005 CZ6
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2012-S69 & 2012-S72 -- 2012 SW20, 2012 SL50, 2001 SG262, 5646
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2012-S73 -- 2012 SM50
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2012-S69 -- 333889
F658David Tholen's team in Hawaii via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-S69 -- 29075
J95Great Shefford Obs. in England, 6 in MPECs 2012-S69, 2012-S71, 2012-S72 & 2012-S73 -- 2012 SY49, 2012 SW20, 2012 SM50, 2012 SL50, 2012 SK50, 2012 SJ32
168Kourovskaya Obs. in Russia, 10 in MPEC 2012-S69 -- 2012 MK6, 2010 OS22, 2001 QG142, 333284, 326732, 219071, 217013, 214869, 5646, 5587
704LINEAR in New Mexico, 2 in MPECs 2012-S69 & 2012-S71 -- 2012 SK50, 334412
932McCarthy Obs. in Connecticut, 1 in MPEC 2012-S72 -- 2012 SL50
711McDonald Obs. in Texas, 4 in MPECs 2012-S69 & 2012-S71 -- 2012 SW49, 2012 SK50, 2012 SH32, 2012 SG32
900Moriyama Obs. in Japan, 1 in MPEC 2012-S72 -- 2012 SL50
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2012-S69 & 2012-S73 -- 2012 SM50, 2012 SG32, 207970
B49Paus Obs. in Spain, 1 in MPEC 2012-S71 -- 2012 SK50
854Sabino Canyon Obs. in Arizona, 2 in MPECs 2012-S71 & 2012-S72 -- 2012 SL50, 2012 SK50
J84South Obs. in England, 2 in MPEC 2012-S69 -- 2012 RH15, 2012 QE50
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2012-S69 -- 1998 SE36
291Spacewatch 1.8m telescope in Arizona, 18 in MPECs 2012-S69, 2012-S70 & 2012-S72 -- 2012 SW20, 2012 SV20, 2012 ST9, 2012 SL8, 2012 SL50, 2012 SC22, 2012 SA3, 2012 RU16, 2012 QF42, 2012 HN13, 2011 CS4, 2010 LT108, 2010 AE, 2009 SQ104, 2008 AG33, 2007 TQ24, 2002 XZ38, 3753
926Tenagra II Obs. in Arizona, 1 in MPEC 2012-S69 -- 2012 OB1
B18Terskol Obs. in Russia, 1 in MPEC 2012-S73 -- 2012 SM50
I15Wishing Star Obs. in Rhode Island, 5 in MPEC 2012-S69 -- 2012 SW20, 2012 QB17, 2012 PS17, 2012 JS11, 162911
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 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 SY49JPL Sentry16192036-2107372.9e-05-4.65-4.910JPL: "Analysis based on 34 observations spanning 2.8019 days (2012-Sep-22.26616 to 2012-Sep-25.06808)." Diameter approximately 0.024 km. from mean, weighted H=25.7.
NEODyS16192032-2100323.49e-05-4.58-4.690NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2012-09-22.267 to 2012-09-25.069."
2012 SW20NEODyS16192086-208619.68e-10-6.41-6.410NEODyS: "Based on 218 optical observations (of which 0 are rejected as outliers) from 2012-09-18.301 to 2012-09-25.164."
JPL Sentry1619R E M O V E DJPL: Risk listing removed at 0853 UTC.
2012 SU9JPL Sentry16192084-211171.3e-06-7.25-7.310JPL: "Analysis based on 39 observations spanning 4.9900 days (2012-Sep-19.22484 to 2012-Sep-24.214854)." Diameter approximately 0.012 km. from mean, weighted H=27.2.
NEODyS16192091-210021.01e-07-8.29-8.370NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2012-09-19.226 to 2012-09-24.216."
2012 RU16JPL Sentry16192032-210641.3e-06-6.44-6.680JPL: "Analysis based on 51 observations spanning 9.8483 days (2012-Sep-15.34955 to 2012-Sep-25.19788)." Diameter approximately 0.025 km. from mean, weighted H=25.6.
NEODyS16192032-208942.42e-07-7.04-7.320NEODyS: "Based on 51 optical observations (of which 0 are rejected as outliers) from 2012-09-15.350 to 2012-09-25.199."

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 September '12

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

1848Updated Traffic Report
1707Grabbed MPEC 2012-S71 - 2012 SK50 - see above
Grabbed MPEC 2012-S72 - 2012 SL50 - see above
Grabbed MPEC 2012-S73 - 2012 SM50 - see above
1619Noted 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
Noted that NEODyS has posted 2012 SW20 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 SY49 risk assessment - see above
Noted that NEODyS has posted 2012 SY49 as an impact risk - see above
Grabbed MPEC 2012-S68 - 2011 LX10 - see above
Grabbed MPEC 2012-S69 - Daily Orbit Update - see above
Grabbed MPEC 2012-S70 - 2009 SQ104 - see above