Contents  on 4 October '13

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 4 October '13

Four objects reported inside ten LD

There are four objects reported to be within a radius of ten lunar distances (LD) from our home world today. Radar target 2013 SU24 is inbound from 5.49 to 5.17 LD, risk-listed intruder 2013 RZ53 is outbound from 5.20 to 5.52 LD and newly discovered 2013 TQ4 from 5.37 to 6.06 LD, and 2013 TD departs from inside ten LD, moving from 9.86 to 11.26 LD.

Approaching our neighborhood next, 2013 SC21 and newly announced 2013 TO4 arrive inside ten LD tomorrow.

This report was updated at 2230 UTC with new discoveries 2013 TQ4 (MPEC), 2013 TO4 (MPEC), and already departed, risk-listed 2013 TP4 (MPEC). Today's first traffic report was generated at 1514 UTC with follow-up in today's DOU MPEC for 2013 TD, 2013 SU24, and 2013 SC21, plus observation of distant 2012 UV136.



Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. "Distant" is used to describe previous close-passers (2007+) that are not coming inside ten LD during this passage or apparition. 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 4 October '13

Radar observation of three 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 1811 UTC when the database was dated 4 Oct.


Data update noted at 2211 UTC when the database was dated 4 Oct.


Data update noted at 2315 UTC when the database was dated 4 Oct.

NEOCP Activity  on 4 October '13

The MPC's NEO Confirmation Page has 41 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 41 objects listed. Of these, 20 were "one nighters." So far The Tracking News has counted a total of 59 listings on the NEOCP today.

New MPECs  on 4 October '13

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been ten MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2013-T36 - "20:42 UT" - 2013 TT4


MPEC 2013-T35 - "20:37 UT" - 2013 TS4


MPEC 2013-T34 - "20:33 UT" - 2013 TR4


MPEC 2013-T33 - "20:28 UT" - 2013 TQ4


MPEC 2013-T32 - "20:22 UT" - 2013 TP4


MPEC 2013-T31 - "20:15 UT" - 2013 TO4


MPEC 2013-T30 - "20:09 UT" - 2013 TN4


MPEC 2013-T29 - "20:01 UT" - 2013 TM4


<< DOU on 4 Oct. '13 >>  MPEC 2013-T28 - "06:03 UT" - Daily Orbit Update


MPEC 2013-T27 - "02:32 UT" - Comet C/2013 S1 (Catalina)

Observers  on 4 October '13

A total of 39 observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 2 in radar -- 153349, 152664
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2013-T28 -- 2013 SN20
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2013-T28 -- 2013 SK19
621Bergisch Gladbach Obs. in Germany, 1 in MPEC 2013-T28 -- 2003 OB4
703Catalina Sky Survey (CSS) in Arizona, 16 in MPECs 2013-T27 & 2013-T28 -- 2013 TE, C/2013 S1, 2013 RY5, 2011 WU95, 2007 RV19, 89830, 88710, 371660, 371336, 369264, 368664, 340666, 276786, 189263, 142040, 6455
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPECs 2013-T30 & 2013-T36 -- 2013 TT4, 2013 TN4
G58Chabot Obs. in northern California, 2 in MPEC 2013-T28 -- 2013 SW24, 2013 SU24
448Desert Moon Obs. in New Mexico, 3 in MPECs 2013-T28 & 2013-T31 -- 2013 TO4, 2013 RW73, 2007 TC66
113Drebach Obs. in Germany, 2 in MPECs 2013-T27 & 2013-T33 -- 2013 TQ4, C/2013 S1
K36Ebersheim Obs., 2 in MPEC 2013-T28 -- 2013 RX80, 2013 RH74
E105Richard Miles in England via Faulkes Telescope South in New South Wales, 2 in MPEC 2013-T28 -- 2013 SB20, 2012 UV136
253Goldstone DSS-14 70m antenna in southern California, 2 in radar -- 153349, 152664
J95Great Shefford Obs. in England, 2 in MPECs 2013-T31 & 2013-T33 -- 2013 TQ4, 2013 TO4
C43Hoyerswerda Obs. in Germany, 3 in MPECs 2013-T28 & 2013-T31 -- 2013 TO4, 2013 TJ, 2013 TF
H15ISON-NM Obs. in New Mexico, 3 in MPEC 2013-T28 -- 2008 HB38, 354182, 223456
246KLENOT in the Czech Republic, 12 in MPECs 2013-T27, 2013-T28, 2013-T31 & 2013-T33 -- 2013 TQ4, 2013 TO4, 2013 TE, 2013 SX24, 2013 SW24, 2013 SU24, 2013 SO19, 2013 SE21, C/2013 S1, 2013 RH74, 2013 PV6, 2012 ER14
046Klet Obs. in the Czech Republic, 6 in MPEC 2013-T28 -- 2013 SW24, 2013 SU24, 2013 RH74, 17511, 159399, 12711
Q64LCOGT Siding Spring B in New South Wales, 1 in MPEC 2013-T27 -- C/2013 S1
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2013-T36 -- 2013 TT4
H01Magdalena Ridge Obs. (MRO) in New Mexico, 7 in MPECs 2013-T29, 2013-T30, 2013-T31, 2013-T32, 2013-T33, 2013-T34 & 2013-T36 -- 2013 TT4, 2013 TR4, 2013 TQ4, 2013 TP4, 2013 TO4, 2013 TN4, 2013 TM4
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2013-T29 -- 2013 TM4
900Moriyama Obs. in Japan, 1 in MPEC 2013-T27 -- C/2013 S1
474Mt. John Obs. in New Zealand, 22 in MPECs 2013-T28 & 2013-T30 -- 2013 TN4, 2013 TK, 2013 TJ, 2013 TF, 2013 SV24, 2013 ST19, 2013 ST, 2013 SO24, 2013 SN24, 2013 SL20, 2013 SE21, 2013 SD21, 2013 SD20, 2013 SC21, 2013 SB21, 2013 SA20, 2013 RY5, 2013 RX73, 2013 RU5, 2013 RH36, 2013 OP3, 2013 EV89
G96Mt. Lemmon Survey (MLS) in Arizona, 13 in MPECs 2013-T27, 2013-T28, 2013-T30, 2013-T31, 2013-T32, 2013-T33, 2013-T34 & 2013-T36 -- 2013 TT4, 2013 TR4, 2013 TQ4, 2013 TP4, 2013 TO4, 2013 TN4, 2013 SO24, C/2013 S1, 2013 QH11, 2001 CK42, 197588, 6178, 3361
C47Nonndorf Obs. in Austria, 2 in MPEC 2013-T28 -- 2013 SW24, 2013 SU24
G34Oberfrauendorf Obs., 1 in MPEC 2013-T28 -- 2013 RH74
I41Palomar Transient Factory (PTF) in southern California, 7 in MPEC 2013-T28 -- 2013 MX5, 2010 TN54, 276786, 220909, 17511, 5143, 4450
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2013-T28, 2013-T29 & 2013-T34 -- 2013 TR4, 2013 TM4, 2013 TE4, 2008 TA1, 30825, 3361
461SZTE Asteroid Program in Hungary, 1 in MPEC 2013-T28 -- 2013 SW24
854Sabino Canyon Obs. in Arizona, 2 in MPECs 2013-T31 & 2013-T33 -- 2013 TQ4, 2013 TO4
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2013-T27 -- C/2013 S1
033Schwarzschild Obs. in Germany, 8 in MPECs 2013-T27, 2013-T28, 2013-T31 & 2013-T35 -- 2013 TS4, 2013 TO4, 2013 TL, 2013 TG, 2013 TD, 2013 SU24, C/2013 S1, 2013 QM10
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2013-T35 -- 2013 TS4
291Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2013-T28, 2013-T30, 2013-T32 & 2013-T35 -- 2013 TS4, 2013 TP4, 2013 TN4, 2013 RU73, 2013 RJ74, 2013 RD21, 2013 RB74, 2013 LM31, 2012 FR62, 2007 LD
C36Starry Wanderer Obs. in Belarus, 1 in MPEC 2013-T28 -- 2013 SW24
673!Jana Pittichova via Table Mtn. Obs. in southern California, 1 in MPEC 2013-T27 -- C/2013 S1
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-T27 -- C/2013 S1
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-T27 -- C/2013 S1
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-T27 -- C/2013 S1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 October '13

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
2013 TP4JPL Sentry22112026-203522.1e-05-4.84-4.840JPL: "Analysis based on 15 observations spanning .94945 days (2013-Oct-03.22944 to 2013-Oct-04.17889)." Diameter approximately 0.012 km. from mean, weighted H=27.3.
2013 TG4NEODyS15102019-2102115.15e-09-6.13-6.320NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2013-10-02.349 to 2013-10-03.353."
2013 SW24NEODyS15102106-210613.95e-08-5.69-5.690NEODyS: "Based on 113 optical observations (of which 0 are rejected as outliers) from 2013-09-27.557 to 2013-10-03.842."

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 4 October '13

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

2315Noted Radar Astrometry database update - see above
2230Updated Traffic Report
2211Noted that JPL Sentry has posted 2013 TP4 as an impact risk - see above
Noted Radar Astrometry database update - see above
2104Grabbed MPEC 2013-T35 - 2013 TS4 - see above
Grabbed MPEC 2013-T36 - 2013 TT4 - see above
2035Grabbed MPEC 2013-T31 - 2013 TO4 - see above
Grabbed MPEC 2013-T32 - 2013 TP4 - see above
Grabbed MPEC 2013-T33 - 2013 TQ4 - see above
Grabbed MPEC 2013-T34 - 2013 TR4 - see above
2034Grabbed MPEC 2013-T30 - 2013 TN4 - see above
2006Grabbed MPEC 2013-T29 - 2013 TM4 - see above
1811Noted Radar Astrometry database update - see above
1510Noted that NEODyS has updated its 2013 SW24 risk assessment - see above
Noted that NEODyS has posted 2013 TG4 as an impact risk - see above
Grabbed MPEC 2013-T28 - Daily Orbit Update - see above
0253Grabbed MPEC 2013-T27 - Comet C/2013 S1 (Catalina) - see above