Contents  on 4 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 4 September '13

Five objects reported inside ten LD

Five visitors are reported traveling within ten lunar distances (LD) of our planet today. Inside Earth's Hill sphere, 2013 RZ5 comes its closest to Earth on this passage, reaching 1.15 LD at 0659 UT, and also its closest to the Moon -- 1.30 LD at 1333 UT, while intruder 2013 RG exits the sphere, passing from 2.13 to 5.69 LD.

Out further, 2013 RQ5 enters ten LD, moving from 12.58 to 8.09 LD, 2013 QE16 is inbound from 8.33 to 8.21 LD, and 2013 RO5 exits ten LD, moving from 9.60 to 10.56 LD.

This report was generated at 1639 UTC with follow-up in today's DOU MPEC for 2013 RZ5, 2013 RO5, 2013 RG, 2013 QE16, and 2013 PR43.

JPL initially indicated great uncertainty about the passage of 2013 RG but with follow-up reported today is showing no uncertainty that this tiny intruder flew past Earth at 0.59 LD at 1025 UT and past the Moon at 0.66 LD at 1705 UT yesterday.



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 4 September '13

The MPC's NEO Confirmation Page has 55 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 55 objects listed. Of these, 21 were "one nighters." So far The Tracking News has counted a total of 77 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 4 September '13

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 2013-R41 - "23:03 UT" - 2013 RX9


MPEC 2013-R40 - "22:57 UT" - 2013 RV9


MPEC 2013-R39 - "22:52 UT" - 2013 RU9


MPEC 2013-R38 - "22:47 UT" - 2013 RT9


MPEC 2013-R37 - "22:43 UT" - 2013 RS9


MPEC 2013-R36 - "22:38 UT" - 2013 RR9


MPEC 2013-R35 - "22:33 UT" - 2013 RO9


MPEC 2013-R34 - "22:28 UT" - 2013 RN9


MPEC 2013-R33 - "15:53 UT" - 2009 UW2


<< DOU on 4 Sept. '13 >>  MPEC 2013-R32 - "06:03 UT" - Daily Orbit Update

Observers  on 4 September '13

A total of 31 observers appear in today's MPECs.

CodeObserver / observatory
C60Argelander Institute for Astronomy Obs. in Germany, 1 in MPEC 2013-R32 -- 196256
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPECs 2013-R32, 2013-R33, 2013-R35, 2013-R36, 2013-R37, 2013-R38 & 2013-R39 -- 2013 RU9, 2013 RT9, 2013 RS9, 2013 RR9, 2013 RO9, 2013 RG, 2013 QJ10, 2013 PX6, 2013 PV6, 2013 NX23, 2009 UW2
B88Bigmuskie Obs. in Italy, 1 in MPEC 2013-R32 -- 2013 QC11
160Castelmartini Obs. in Italy, 1 in MPEC 2013-R32 -- 2013 RO5
703Catalina Sky Survey (CSS) in Arizona, 9 in MPEC 2013-R32 -- 2013 QN10, 2013 QJ36, 2011 BN24, 2003 OB4, 329437, 275677, 26166, 5143, 4183
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPEC 2013-R32 -- 2013 RO5, 2013 QY1, 2013 QH48, 2013 QC11, 85989, 8014, 7977, 7888
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2013-R32 -- 329437
151Eschenberg Obs. in Switzerland, 2 in MPECs 2013-R32 & 2013-R36 -- 2013 RR9, 2013 QJ10
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2013-R36 & 2013-R37 -- 2013 RS9, 2013 RR9
203GiaGa Obs. in Italy, 2 in MPEC 2013-R32 -- 2013 PN43, 2013 OM9
J95Great Shefford Obs. in England, 5 in MPECs 2013-R32, 2013-R36, 2013-R37 & 2013-R38 -- 2013 RZ5, 2013 RT9, 2013 RS9, 2013 RR9, 2013 RG
B86Hagen Obs. in Germany, 1 in MPEC 2013-R36 -- 2013 RR9
D00ISON-Kislovodsk Obs., 1 in MPEC 2013-R32 -- 3691
K48Keyhole Obs., 2 in MPEC 2013-R32 -- 361071, 137126
K93LCOGT Sutherland C in South Africa, 3 in MPECs 2013-R38, 2013-R40 & 2013-R41 -- 2013 RX9, 2013 RV9, 2013 RT9
I36Los Campitos Obs. in Argentina, 2 in MPECs 2013-R32 & 2013-R36 -- 2013 RR9, 2013 RF
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-R32 -- 2013 NF19
568_Marco Micheli on Mauna Kea in Hawaii, 3 in MPECs 2013-R39, 2013-R40 & 2013-R41 -- 2013 RX9, 2013 RV9, 2013 RU9
B67Mirasteilas Obs. in Switzerland, 3 in MPEC 2013-R32 -- 2013 RY5, 2013 QE16, 2006 UD63
C91Montevenere Obs., 1 in MPEC 2013-R32 -- 340666
474Mt. John Obs. in New Zealand, 4 in MPEC 2013-R32 -- 2013 RF, 2013 QH17, 2013 QC11, 2013 PY38
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2013-R32, 2013-R34, 2013-R35, 2013-R36 & 2013-R38 -- 2013 RT9, 2013 RR9, 2013 RO9, 2013 RN9, 2013 PC7, 368664
644NEAT's Mt. Palomar telescope in southern California, 2 in MPEC 2013-R32 -- 2002 RO137, 2002 RN38
A13Naef Obs. in Switzerland, 3 in MPEC 2013-R32 -- 2013 PU13, 2013 PR43, 162510
F51Pan-STARRS 1 (PS1) in Hawaii, 15 in MPECs 2013-R32, 2013-R37, 2013-R39, 2013-R40 & 2013-R41 -- 2013 RX9, 2013 RV9, 2013 RU9, 2013 RS9, 2013 QK48, 2013 QD11, 2013 PO43, 2013 BO76, 2010 TN54, 2006 KD1, 2003 OB4, 275677, 250620, 221787, 4183
233San Vito Obs. in Italy, 2 in MPEC 2013-R32 -- 85804, 271480
H36Sandlot Obs. in Kansas, 3 in MPECs 2013-R32, 2013-R36 & 2013-R37 -- 2013 RS9, 2013 RR9, 2013 QH11
204Schiaparelli Obs. in Italy, 4 in MPECs 2013-R32, 2013-R35, 2013-R36 & 2013-R38 -- 2013 RT9, 2013 RR9, 2013 RO9, 2007 CN26
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2013-R32 -- 1943
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2013-R32 -- 2013 QN11
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2013-R36 & 2013-R37 -- 2013 RS9, 2013 RR9
0122Thierry Pauwels via Uccle Obs. in Belgium, 1 in MPEC 2013-R32 -- 21088
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 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 RE6NEODyS14562017-2110436.14e-08-4.83-4.870NEODyS: "Based on 9 optical observations (of which 0 are rejected as outliers) from 2013-09-02.544 to 2013-09-03.383."
JPL Sentry00482017-21121071.4e-07-4.75-4.930JPL: "Analysis based on 9 observations spanning .83889 days (2013-Sep-02.54342 to 2013-Sep-03.38231)." Diameter approximately 0.180 km. from mean, weighted H=21.4.
2013 RA6JPL Sentry00482030-2107303.4e-07-6.48-6.860JPL: "Analysis based on 13 observations spanning .99353 days (2013-Sep-02.22615 to 2013-Sep-03.219679)." Diameter approximately 0.034 km. from mean, weighted H=25.0.
2013 RFJPL Sentry1456209746.6e-07-5.10-5.310JPL: "Analysis based on 49 observations spanning 4.7449 days (2013-Aug-30.43539 to 2013-Sep-04.18034)." Diameter approximately 0.096 km. from mean, weighted H=22.7.
NEODyS14562097-210033.21e-09-7.43-7.50NEODyS: "Based on 49 optical observations (of which 0 are rejected as outliers) from 2013-08-30.436 to 2013-09-04.181."
2013 QM48NEODyS14562076-2112501.06e-05-6.48-7.130NEODyS: "Based on 8 optical observations (of which 0 are rejected as outliers) from 2013-08-30.462 to 2013-09-03.282."

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 September '13

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

2311Grabbed MPEC 2013-R34 - 2013 RN9 - see above
Grabbed MPEC 2013-R35 - 2013 RO9 - see above
Grabbed MPEC 2013-R36 - 2013 RR9 - see above
Grabbed MPEC 2013-R37 - 2013 RS9 - see above
Grabbed MPEC 2013-R38 - 2013 RT9 - see above
Grabbed MPEC 2013-R39 - 2013 RU9 - see above
Grabbed MPEC 2013-R40 - 2013 RV9 - see above
Grabbed MPEC 2013-R41 - 2013 RX9 - see above
1639Generated Traffic Report
1637Grabbed MPEC 2013-R33 - 2009 UW2 - see above
1456Noted that NEODyS has posted 2013 QM48 as an impact risk - see above
Noted that NEODyS has posted 2013 RE6 as an impact risk - see above
Noted that JPL Sentry has updated its 2013 RF risk assessment - see above
Noted that NEODyS has updated its 2013 RF risk assessment - see above
Grabbed MPEC 2013-R32 - Daily Orbit Update - see above
0048Noted that JPL Sentry has posted 2013 RA6 as an impact risk - see above
Noted that JPL Sentry has posted 2013 RE6 as an impact risk - see above