Contents  on 29 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 29 September '13

Three objects reported inside ten LD

There are three visitors reported flying within ten lunar distances (LD) of our planet today. Inside Earth's Hill sphere, 2013 SK20 comes its closest to Earth this time around, reaching 2.27 LD at 0010 UT, and tiny risk-listed intruder 2013 RZ53 exits Earth's Hill sphere, sliding from 3.59 to 3.91 LD. Out further, 2013 SP19 is headed away, from 8.67 to 9.81 LD.

Approaching our neighborhood next, newly announced 2013 SC21 arrives inside ten LD on October 5th.

This report was generated at 1610 UTC with new discovery 2013 SC21 (MPEC).



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 29 September '13

The MPC's NEO Confirmation Page has 24 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 24 objects listed. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 35 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 29 September '13

Minor Planet Electronic Circulars

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


MPEC 2013-S64 - "11:27 UT" - 2013 SE21


MPEC 2013-S63 - "11:23 UT" - 2013 SD21


MPEC 2013-S62 - "11:16 UT" - 2013 SC21


MPEC 2013-S61 - "11:12 UT" - 2013 SB21


<< DOU on 29 Sept. '13 >>  MPEC 2013-S60 - "06:03 UT" - Daily Orbit Update

Observers  on 29 September '13

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 21 in MPECs 2013-S60, 2013-S63 & 2013-S64 -- 2013 SX19, 2013 ST, 2013 SQ19, 2013 SO19, 2013 SK19, 2013 SE21, 2013 SD21, 2013 SA20, 2013 RZ73, 2013 RY5, 2013 RX80, 2013 RW73, 2013 RS5, 2013 RM43, 2013 RK16, 2013 RH74, 2013 RE21, 2013 RB6, 2013 PV6, 2007 PF6, 97725
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2013-S60 -- 2006 WJ3
703Catalina Sky Survey (CSS) in Arizona, 7 in MPEC 2013-S60 -- 2013 RW73, 2013 PV6, 2005 SH26, 370688, 26166, 250620, 162913
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPECs 2013-S60 & 2013-S64 -- 2013 SU19, 2013 ST19, 2013 SE21, 2013 RC21, 2013 PY6, 2013 PU31, 2013 PD21, 2010 RM42
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2013-S60 -- 2013 SN20
448Desert Moon Obs. in New Mexico, 6 in MPEC 2013-S60 -- 2013 RH74, 2013 RH43, 326946, 274855, 162913, 137126
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2013-S60 -- 2013 SN20
113Drebach Obs. in Germany, 2 in MPECs 2013-S60 & 2013-S64 -- 2013 SE21, 2013 PV6
355Hadano Obs. in Japan, 1 in MPEC 2013-S60 -- 2013 RH74
246KLENOT in the Czech Republic, 1 in MPEC 2013-S63 -- 2013 SD21
W86LCOGT Cerro Tololo B in Chile, 2 in MPECs 2013-S62 & 2013-S64 -- 2013 SE21, 2013 SC21
568_Marco Micheli on Mauna Kea in Hawaii, 3 in MPECs 2013-S62, 2013-S63 & 2013-S64 -- 2013 SE21, 2013 SD21, 2013 SC21
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2013-S60 & 2013-S61 -- 2013 SB21, 2013 PU13, 168378, 106538
A24New Millennium Obs. in Italy, 8 in MPEC 2013-S60 -- 2012 TS, 88710, 53435, 361071, 24445, 21088, 9950, 4450
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2013-S62, 2013-S63 & 2013-S64 -- 2013 SE21, 2013 SD21, 2013 SC21
461SZTE Asteroid Program in Hungary, 2 in MPEC 2013-S60 -- 88710, 196256
204Schiaparelli Obs. in Italy, 13 in MPEC 2013-S60 -- 2013 RU9, 2013 RS9, 2013 RQ43, 2013 RN9, 2013 RF, 2013 RE6, 2013 RE, 2013 QN17, 2013 QN11, 2013 QL10, 2013 QJ36, 2013 QJ10, 2013 PB39
033Schwarzschild Obs. in Germany, 8 in MPEC 2013-S60 -- 2013 SY19, 2013 SX19, 2013 SS19, 2013 SR, 2013 SO19, 2013 SM20, 2013 SA20, 2012 FR62
691Spacewatch 0.9m telescope in Arizona, 14 in MPECs 2013-S60, 2013-S61 & 2013-S62 -- 2013 SC21, 2013 SB21, 2013 RZ73, 2013 RL21, 2013 RK43, 2013 RJ74, 2013 RH43, 2013 RE21, 2013 RD21, 2013 RB74, 2013 QL10, 2013 QK48, 2013 QJ48, 2013 QH48
926Tenagra II Obs. in Arizona, 2 in MPECs 2013-S60 & 2013-S64 -- 2013 SS19, 2013 SE21
G56Walnut Creek Obs. in northern California, 2 in MPEC 2013-S60 -- 2013 SO19, 2013 RH74
718Wiggins Obs. in Utah, 3 in MPEC 2013-S60 -- 2013 SO19, 2013 RX80, 2013 RH74
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 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 RFJPL Sentry1528R E M O V E DJPL: Risk listing removed at 1204 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 29 September '13

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

1610Generated Traffic Report
1528Noted that JPL Sentry has removed 2013 RF as an impact risk - see above
Grabbed MPEC 2013-S60 - Daily Orbit Update - see above
Grabbed MPEC 2013-S61 - 2013 SB21 - see above
Grabbed MPEC 2013-S62 - 2013 SC21 - see above
Grabbed MPEC 2013-S63 - 2013 SD21 - see above
Grabbed MPEC 2013-S64 - 2013 SE21 - see above