Contents  on 5 September '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 5 September '13

Four objects reported inside ten LD

There are four objects reported to be within ten lunar distances (LD) of Earth today. 2013 RZ5 exits Earth's Hill sphere, moving from 2.95 to 6.66 LD. More distant, 2013 RQ5 is inbound from 8.09 to 4.98 LD, intruder 2013 RG is outbound from 5.69 to 9.29 LD, and 2013 QE16 comes its closest to Earth on this passage, reaching 8.19 LD at 1143 UT.

This report was generated at 1426 UTC.



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 5 September '13

The MPC's NEO Confirmation Page has 32 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 32 objects listed. Of these, fifteen were "one nighters." So far The Tracking News has counted a total of 68 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 5 September '13

Minor Planet Electronic Circulars

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


MPEC 2013-R55 - "21:28 UT" - 2013 RO21


MPEC 2013-R54 - "21:23 UT" - 2013 RN21


MPEC 2013-R53 - "21:18 UT" - 2013 RM21


MPEC 2013-R52 - "21:14 UT" - 2013 RL21


MPEC 2013-R51 - "21:10 UT" - 2013 RK21


MPEC 2013-R50 - "21:05 UT" - 2013 RH21


MPEC 2013-R49 - "20:56 UT" - 2013 RG21


MPEC 2013-R48 - "20:52 UT" - 2013 RE21


MPEC 2013-R47 - "20:47 UT" - 2013 RD21


MPEC 2013-R46 - "20:42 UT" - 2013 RC21


MPEC 2013-R45 - "20:37 UT" - 2013 RB21


MPEC 2013-R44 - "10:11 UT" - 2013 QB53


<< DOU on 5 Sept. '13 >>  MPEC 2013-R43 - "06:03 UT" - Daily Orbit Update


MPEC 2013-R42 - "00:24 UT" - 2013 RK16

Observers  on 5 September '13

A total of 34 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPECs 2013-R42, 2013-R43, 2013-R46, 2013-R47, 2013-R48, 2013-R49, 2013-R51, 2013-R52 & 2013-R55 -- 2013 RO21, 2013 RL21, 2013 RK21, 2013 RK16, 2013 RG21, 2013 RE21, 2013 RD21, 2013 RC21, 2013 QV1, 2013 QM10, 2013 QH11, 2013 QF11, 2013 PZ38, 2013 PV6, 2013 PN43, 2013 OS3, 2013 NC15
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2013-R43 -- 2004 QD3
C77Bernezzo Obs. in Italy, 1 in MPEC 2013-R43 -- 2013 PN43
160Castelmartini Obs. in Italy, 1 in MPEC 2013-R51 -- 2013 RK21
703Catalina Sky Survey (CSS) in Arizona, 11 in MPECs 2013-R42, 2013-R43 & 2013-R51 -- 2013 RK21, 2013 RK16, 2013 MX5, 2010 TN54, 2009 SK1, 1998 SO, 350988, 251346, 162566, 162510, 4450
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2013-R43 -- 2013 RE
K20Danastro Obs., 1 in MPEC 2013-R43 -- 2013 QJ10
448Desert Moon Obs. in New Mexico, 3 in MPEC 2013-R43 -- 2011 UW158, 243147, 162269
151Eschenberg Obs. in Switzerland, 3 in MPEC 2013-R43 -- 2013 QJ10, 2013 OM9, 2013 BO76
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2013-R42 -- 2013 RK16
J95Great Shefford Obs. in England, 4 in MPECs 2013-R42, 2013-R48, 2013-R53 & 2013-R55 -- 2013 RO21, 2013 RM21, 2013 RK16, 2013 RE21
D00ISON-Kislovodsk Obs., 1 in MPEC 2013-R43 -- 354182
W86LCOGT Cerro Tololo B in Chile, 2 in MPECs 2013-R46 & 2013-R47 -- 2013 RD21, 2013 RC21
Q64LCOGT Siding Spring B in New South Wales, 1 in MPEC 2013-R54 -- 2013 RN21
K91LCOGT Sutherland A in South Africa, 2 in MPECs 2013-R50 & 2013-R52 -- 2013 RL21, 2013 RH21
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 1 in MPEC 2013-R43 -- 2006 XJ1
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-R43 -- 2013 KM6
568_Marco Micheli on Mauna Kea in Hawaii, 6 in MPECs 2013-R44, 2013-R45, 2013-R46, 2013-R47, 2013-R49 & 2013-R50 -- 2013 RH21, 2013 RG21, 2013 RD21, 2013 RC21, 2013 RB21, 2013 QB53
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2013-R43 -- 2013 QN10, 3361
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2013-R43, 2013-R48, 2013-R52, 2013-R53 & 2013-R54 -- 2013 RN21, 2013 RM21, 2013 RL21, 2013 RE21, 2012 XR134, 2010 TN54, 2003 CN17
A13Naef Obs. in Switzerland, 1 in MPEC 2013-R48 -- 2013 RE21
A24New Millennium Obs. in Italy, 1 in MPEC 2013-R51 -- 2013 RK21
G34Oberfrauendorf Obs., 1 in MPEC 2013-R43 -- 329437
F51Pan-STARRS 1 (PS1) in Hawaii, 11 in MPECs 2013-R43, 2013-R44, 2013-R45, 2013-R46, 2013-R47, 2013-R49, 2013-R50 & 2013-R55 -- 2013 RO21, 2013 RH21, 2013 RG21, 2013 RD21, 2013 RC21, 2013 RB21, 2013 QB53, 2013 OO5, 355256, 269690, 154276
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 2 in MPEC 2013-R43 -- 2013 BO76, 137126
Y00SONEAR Obs. in Brazil, 1 in MPEC 2013-R42 -- 2013 RK16
461SZTE Asteroid Program in Hungary, 2 in MPECs 2013-R42 & 2013-R43 -- 2013 RK16, 2013 OG
H36Sandlot Obs. in Kansas, 7 in MPECs 2013-R42, 2013-R43, 2013-R47, 2013-R48, 2013-R53 & 2013-R54 -- 2013 RN21, 2013 RM21, 2013 RK16, 2013 RE21, 2013 RD21, 2013 QY1, 2010 RL42
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2013-R42 -- 2013 RK16
C48Sayn Solar Obs. in Russia, 1 in MPEC 2013-R51 -- 2013 RK21
204Schiaparelli Obs. in Italy, 5 in MPECs 2013-R42, 2013-R47, 2013-R48, 2013-R51 & 2013-R53 -- 2013 RM21, 2013 RK21, 2013 RK16, 2013 RE21, 2013 RD21
033Schwarzschild Obs. in Germany, 10 in MPEC 2013-R43 -- 2013 PX6, 2013 PW6, 2013 PV6, 2013 OO5, 2013 OH, 2010 VM1, 2009 SQ172, 2007 UB66, 2007 SW2, 2006 UD63
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2013-R43, 2013-R45, 2013-R46, 2013-R47, 2013-R49 & 2013-R50 -- 2013 RH21, 2013 RG21, 2013 RE6, 2013 RD21, 2013 RC21, 2013 RB21, 2013 NJ
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2013-R42, 2013-R51 & 2013-R53 -- 2013 RM21, 2013 RK21, 2013 RK16
198Wildberg Obs. in Germany, 1 in MPEC 2013-R51 -- 2013 RK21
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 September '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 RN21JPL Sentry23242066-209929.6e-10-7.50-7.580JPL: "Analysis based on 10 observations spanning .92446 days (2013-Sep-04.45887 to 2013-Sep-05.38333)." Diameter approximately 0.160 km. from mean, weighted H=21.7.
2013 RV9NEODyS14222023-2112629.73e-07-5.49-6.160NEODyS: "Based on 9 optical observations (of which 0 are rejected as outliers) from 2013-09-03.423 to 2013-09-04.317."
JPL Sentry01592023-21131071.1e-06-5.51-6.200JPL: "Analysis based on 9 observations spanning .89352 days (2013-Sep-03.42266 to 2013-Sep-04.316177)." Diameter approximately 0.054 km. from mean, weighted H=24.0.
2013 RU9JPL Sentry1630207911.1e-10-9.49-9.490JPL #2 for the day: "Analysis based on 7 observations spanning .87670 days (2013-Sep-03.43556 to 2013-Sep-04.312258)." Diameter approximately 0.056 km. from mean, weighted H=23.9.
2013 RN9JPL Sentry01592016-2112884.4e-08-6.30-6.410JPL: "Analysis based on 12 observations spanning 2.1362 days (2013-Sep-02.22442 to 2013-Sep-04.36063)." Diameter approximately 0.052 km. from mean, weighted H=24.1.
2013 RE6NEODyS1422R E M O V E D-
JPL Sentry1422R E M O V E DJPL: Risk listing removed at 1212 UTC.

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 5 September '13

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

2324Noted that JPL Sentry has posted 2013 RN21 as an impact risk - see above
2205Grabbed MPEC 2013-R52 - 2013 RL21 - see above
Grabbed MPEC 2013-R53 - 2013 RM21 - see above
Grabbed MPEC 2013-R54 - 2013 RN21 - see above
Grabbed MPEC 2013-R55 - 2013 RO21 - see above
2114Grabbed MPEC 2013-R45 - 2013 RB21 - see above
Grabbed MPEC 2013-R46 - 2013 RC21 - see above
Grabbed MPEC 2013-R47 - 2013 RD21 - see above
Grabbed MPEC 2013-R48 - 2013 RE21 - see above
Grabbed MPEC 2013-R49 - 2013 RG21 - see above
Grabbed MPEC 2013-R50 - 2013 RH21 - see above
Grabbed MPEC 2013-R51 - 2013 RK21 - see above
1630Noted that JPL Sentry has updated its 2013 RU9 risk assessment - see above
1426Generated Traffic Report
1422Noted that JPL Sentry has removed 2013 RE6 as an impact risk - see above
Noted that NEODyS has removed 2013 RE6 as an impact risk - see above
Noted that NEODyS has posted 2013 RV9 as an impact risk - see above
Grabbed MPEC 2013-R43 - Daily Orbit Update - see above
Grabbed MPEC 2013-R44 - 2013 QB53 - see above
0159Noted that JPL Sentry has posted 2013 RN9 as an impact risk - see above
Noted that JPL Sentry has posted 2013 RU9 as an impact risk - see above
Noted that JPL Sentry has posted 2013 RV9 as an impact risk - see above
0037Grabbed MPEC 2013-R42 - 2013 RK16 - see above