Contents  on 21 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 21 September '12

Two objects reported inside ten LD

Two objects are reported passing our planet within ten lunar distances (LD) today, both outbound. 2012 SW2 moves from 5.41 to 8.92 LD and 2012 SZ2 from 8.66 to 9.71 LD.

Headed our way next, 2012 RK15 arrives inside ten LD tomorrow and 2010 JK1 arrives on November 22nd.

This report was generated at 1429 UTC with follow-up in today's DOU MPEC for 2012 RK15 and departed 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.

Radar Astrometry  on 21 September '12

Radar observation of two objects

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 2133 UTC when the database was dated 21 Sept.


Data update noted at 2311 UTC when the database was dated 21 Sept.

NEOCP Activity  on 21 September '12

The MPC's NEO Confirmation Page has 5 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had five objects listed. Of these, three were "one nighters." So far The Tracking News has counted a total of 20 listings on the NEOCP today.

New MPECs  on 21 September '12

Minor Planet Electronic Circulars

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


MPEC 2012-S51 - "21:09 UT" - 2012 SD22


MPEC 2012-S50 - "21:06 UT" - 2012 SC22


MPEC 2012-S49 - "21:04 UT" - 2012 SB22


MPEC 2012-S48 - "21:02 UT" - 2012 SA22


MPEC 2012-S47 - "17:55 UT" - 2012 SY20


MPEC 2012-S46 - "17:53 UT" - 2012 SX20


MPEC 2012-S45 - "17:51 UT" - 2012 SW20


MPEC 2012-S44 - "17:48 UT" - 2012 SV20


MPEC 2012-S43 - "14:34 UT" - Comet P/2011 S1 (Gibbs)


<< DOU on 21 Sept. '12 >>  MPEC 2012-S42 - "06:02 UT" - Daily Orbit Update

Observers  on 21 September '12

A total of 46 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2012-S51 -- 2012 SD22
251Arecibo in Puerto Rico, 2 in radar -- 4769, 2063
H21Astronomical Research Obs. Westfield in Illinois, 21 in MPECs 2012-S42, 2012-S44, 2012-S45, 2012-S46, 2012-S47, 2012-S49, 2012-S50 & 2012-S51 -- 2012 SY20, 2012 SX20, 2012 SX2, 2012 SW20, 2012 SV20, 2012 SM8, 2012 SD22, 2012 SC22, 2012 SB22, 2012 SA3, 2012 RX16, 2012 RV16, 2012 RS16, 2012 RQ16, 2012 RM2, 2012 RJ15, 2012 RJ10, 2012 RH3, 2012 RH15, 2012 RH10, 189865
I74Baxter Garden Obs. in England, 1 in MPEC 2012-S45 -- 2012 SW20
B96Brixiis Obs. in Belgium, 1 in MPEC 2012-S45 -- 2012 SW20
703Catalina Sky Survey (CSS) in Arizona, 6 in MPECs 2012-S42, 2012-S45, 2012-S49 & 2012-S51 -- 2012 SW20, 2012 SD22, 2012 SB22, 2002 RC118, 155334, 887
470Ceccano Obs. in Italy, 1 in MPEC 2012-S45 -- 2012 SW20
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPECs 2012-S42, 2012-S46 & 2012-S51 -- 2012 SX20, 2012 SD22, 2012 RV16, 2012 RN15, 2012 RK15, 2012 RF15, 2012 PQ28
970Chelmsford Obs. in England, 1 in MPEC 2012-S45 -- 2012 SW20
850Cordell-Lorenz Obs. in Tennessee, 3 in MPECs 2012-S42, 2012-S45 & 2012-S49 -- 2012 SW20, 2012 SB22, 333889
448Desert Moon Obs. in New Mexico, 3 in MPEC 2012-S42 -- 1994 EK, 329520, 9058
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2012-S45 -- 2012 SW20
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2012-S45 -- 2012 SW20
F657Paul Roche in Wales via Faulkes Telescope North in Hawaii, 2 in MPECs 2012-S45 & 2012-S48 -- 2012 SW20, 2012 SA22
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-S51 -- 2012 SD22
J95Great Shefford Obs. in England, 3 in MPECs 2012-S44, 2012-S45 & 2012-S48 -- 2012 SW20, 2012 SV20, 2012 SA22
D19Hong Kong Space Museum Obs. in Hong Kong, 1 in MPEC 2012-S42 -- 2012 PG5
D00ISON-Kislovodsk Obs., 1 in MPEC 2012-S42 -- 12538
B15Inastars Obs. in Germany, 1 in MPEC 2012-S45 -- 2012 SW20
704LINEAR in New Mexico, 8 in MPECs 2012-S42 & 2012-S45 -- 2012 SW20, 2012 RK15, 2009 SO103, 2004 RX10, 214869, 162900, 141874, 4587
130Lumezzane Obs. in Italy, 8 in MPEC 2012-S42 -- 2012 RM2, 2012 QG42, 2008 CZ21, 2005 UC, 1999 TX2, 96536, 276397, 7888
C82MPC code C82, 1 in MPEC 2012-S45 -- 2012 SW20
H01Magdalena Ridge Obs. (MRO) in New Mexico, 8 in MPECs 2012-S44, 2012-S45, 2012-S46, 2012-S47, 2012-S48, 2012-S49, 2012-S50 & 2012-S51 -- 2012 SY20, 2012 SX20, 2012 SW20, 2012 SV20, 2012 SD22, 2012 SC22, 2012 SB22, 2012 SA22
711McDonald Obs. in Texas, 2 in MPECs 2012-S44 & 2012-S45 -- 2012 SW20, 2012 SV20
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2012-S42 -- 2012 QQ50, 2006 OT9
118Modra Obs. in Slovakia, 1 in MPEC 2012-S45 -- 2012 SW20
159Monte Agliale Obs. in Italy, 1 in MPEC 2012-S45 -- 2012 SW20
474Mt. John Obs. in New Zealand, 2 in MPECs 2012-S42 & 2012-S49 -- 2012 SB22, 2012 RK15
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2012-S43, 2012-S45, 2012-S46, 2012-S47, 2012-S48, 2012-S50 & 2012-S51 -- 2012 SY20, 2012 SX20, 2012 SW20, 2012 SD22, 2012 SC22, 2012 SA22, P/2011 S1
A24New Millennium Obs. in Italy, 13 in MPEC 2012-S42 -- 2012 QE50, 2012 LE11, 2012 HO15, 2012 BZ76, 2007 RT19, 2005 GQ21, 2002 RC118, 2000 RH60, 1998 QC1, 330825, 143649, 12538, 3200
C47Nonndorf Obs. in Austria, 1 in MPEC 2012-S45 -- 2012 SW20
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 12 in MPEC 2012-S42 -- 2012 SK8, 2012 RV16, 2012 QP17, 2012 QJ2, 2012 QE50, 2012 QB17, 2012 PS17, 2012 LE11, 2012 HO15, 2007 RT19, 2005 UC, 2002 RC118
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-S48 -- 2012 SA22
473Remanzacco Obs. in Italy, 1 in MPEC 2012-S45 -- 2012 SW20
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2012-S45 -- 2012 SW20
H36Sandlot Obs. in Kansas, 5 in MPECs 2012-S44, 2012-S45, 2012-S46, 2012-S48 & 2012-S51 -- 2012 SX20, 2012 SW20, 2012 SV20, 2012 SD22, 2012 SA22
204Schiaparelli Obs. in Italy, 4 in MPECs 2012-S42, 2012-S45 & 2012-S51 -- 2012 SW20, 2012 SD22, 2012 QR50, 2012 QF49
033Schwarzschild Obs. in Germany, 4 in MPECs 2012-S45, 2012-S46, 2012-S47 & 2012-S48 -- 2012 SY20, 2012 SX20, 2012 SW20, 2012 SA22
J84South Obs. in England, 1 in MPEC 2012-S45 -- 2012 SW20
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2012-S44 -- 2012 SV20
291Spacewatch 1.8m telescope in Arizona, 14 in MPECs 2012-S42, 2012-S44, 2012-S46, 2012-S47, 2012-S49, 2012-S50 & 2012-S51 -- 2012 SY20, 2012 SX20, 2012 SV20, 2012 ST9, 2012 SD22, 2012 SC22, 2012 SB22, 2012 RU16, 2012 RG3, 2012 QY14, 2012 QK14, 2012 QF42, 2012 PO28, 2010 OB101
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2012-S45 -- 2012 SW20
954Teide Obs. in the Canary Islands, 7 in MPECs 2012-S42, 2012-S44, 2012-S45, 2012-S47, 2012-S48, 2012-S49 & 2012-S51 -- 2012 SY20, 2012 SW20, 2012 SV20, 2012 SD22, 2012 SB22, 2012 SA22, 2012 RH10
926Tenagra II Obs. in Arizona, 1 in MPEC 2012-S42 -- 334412
I42Westport Obs. in Massachusetts, 3 in MPEC 2012-S42 -- 2012 QB17, 162911, 138847
718Wiggins Obs. in Utah, 1 in MPEC 2012-S45 -- 2012 SW20
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 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.
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
2012 SW20JPL Sentry2004204115.4e-09-5.30-5.300JPL: "Analysis based on 141 observations spanning 3.0155 days (2012-Sep-18.30064 to 2012-Sep-21.31616)." Diameter approximately 0.390 km. from mean, weighted H=19.7.
2012 SU9NEODyS14282082-210029.83e-07-7.35-7.350NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2012-09-19.226 to 2012-09-20.416."
2012 RU16JPL Sentry14282032-210651.0e-06-6.46-6.730JPL: "Analysis based on 36 observations spanning 5.8722 days (2012-Sep-15.34955 to 2012-Sep-21.2217)." Diameter approximately 0.027 km. from mean, weighted H=25.5.
NEODyS14282036-209354.83e-07-6.75-7.010NEODyS: "Based on 36 optical observations (of which 0 are rejected as outliers) from 2012-09-15.350 to 2012-09-21.222."
2012 RJ10JPL Sentry1428208911.3e-08-8.12-8.120JPL: "Analysis based on 35 observations spanning 6.9652 days (2012-Sep-13.26348 to 2012-Sep-20.228706)." Diameter approximately 0.029 km. from mean, weighted H=25.4.

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 21 September '12

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

2311Noted Radar Astrometry database update - see above
2133Grabbed MPEC 2012-S48 - 2012 SA22 - see above
Grabbed MPEC 2012-S49 - 2012 SB22 - see above
Grabbed MPEC 2012-S50 - 2012 SC22 - see above
Grabbed MPEC 2012-S51 - 2012 SD22 - see above
Noted Radar Astrometry database update - see above
2004Noted that JPL Sentry has posted 2012 SW20 as an impact risk - see above
Grabbed MPEC 2012-S45 - 2012 SW20 - see above
Grabbed MPEC 2012-S46 - 2012 SX20 - see above
Grabbed MPEC 2012-S47 - 2012 SY20 - see above
1750Grabbed MPEC 2012-S44 - 2012 SV20 - see above
1614Grabbed MPEC 2012-S43 - Comet P/2011 S1 (Gibbs) - see above
1429Generated Traffic Report
1428Noted 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 NEODyS has posted 2012 SU9 as an impact risk - see above
Grabbed MPEC 2012-S42 - Daily Orbit Update - see above