Contents  on 25 October '13

NOTE:  The A/CC news pages will update less frequently than usual during the next few days.

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 25 October '13

Two objects reported inside ten LD

Two visitors are reported traveling within ten lunar distances (LD) of Earth today. Newly announced intruder 2013 UX2 is inside the Earth-Moon system all day, coming in from 0.70 to 0.39 LD from Earth at 1528 UT and out to 0.51 LD. And radar target 2013 UB leaves ten LD, passing from 9.98 to 11.73 LD.

Up next, 2013 UE1 arrives inside ten LD on November 4th, radar target 2001 AV43 comes inside on November 6th, and radar target 2013 NJ on November 19th.

This report was updated at 1743 UTC with new discovery 2013 UX2 (MPEC). Today's first traffic report was generated at 1404 UTC with follow-up in today's DOU MPEC for 2013 UE1, 2001 AV43, and departed risk-listed 2013 UG1.

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.

NEOCP Activity  on 25 October '13

The MPC's NEO Confirmation Page has 61 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 61 objects listed. Of these, 40 were "one nighters." So far The Tracking News has counted a total of 104 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 25 October '13

Minor Planet Electronic Circulars

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

MPEC 2013-U43 - "21:19 UT" - 2013 UF3

MPEC 2013-U42 - "21:14 UT" - 2013 UE3

MPEC 2013-U41 - "21:09 UT" - 2013 UC3

MPEC 2013-U40 - "21:03 UT" - 2013 UB3

MPEC 2013-U39 - "14:32 UT" - 2013 UX2

<< DOU on 25 Oct. '13 >>  MPEC 2013-U38 - "06:04 UT" - Daily Orbit Update

Observers  on 25 October '13

A total of 25 observers appear in today's MPECs.

CodeObserver / observatory
119Abastumani Obs. in Georgia, 1 in MPEC 2013-U38 -- 2013 TV135
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPECs 2013-U40, 2013-U41, 2013-U42 & 2013-U43 -- 2013 UF3, 2013 UE3, 2013 UC3, 2013 UB3
703Catalina Sky Survey (CSS) in Arizona, 10 in MPECs 2013-U38 & 2013-U39 -- 2013 UX2, 2013 UG1, 2011 UW158, 2008 TA1, 65996, 65733, 326946, 17511, 162694, 162273
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2013-U38 -- 2013 UD1
113Drebach Obs. in Germany, 2 in MPECs 2013-U39 & 2013-U42 -- 2013 UX2, 2013 UE3
151Eschenberg Obs. in Switzerland, 3 in MPEC 2013-U38 -- 2013 UQ1, 2013 UG1, 2013 TV135
H15ISON-NM Obs. in New Mexico, 2 in MPEC 2013-U38 -- 2013 TV135, 2013 RM43
B67Mirasteilas Obs. in Switzerland, 4 in MPEC 2013-U38 -- 2013 TV135, 2008 UW5, 251346, 3361
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2013-U38, 2013-U40, 2013-U41, 2013-U42 & 2013-U43 -- 2013 UF3, 2013 UE3, 2013 UC3, 2013 UB3, 2013 ET9, 1990 UP
G34Oberfrauendorf Obs., 1 in MPEC 2013-U38 -- 1981
C23Olmen Obs. in Belgium, 1 in MPEC 2013-U38 -- 2013 RM43
I41Palomar Transient Factory (PTF) in southern California, 6 in MPEC 2013-U38 -- 2013 TE6, 2013 TE, 2013 SV24, 2008 HB38, 88710, 3361
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2013-U38 -- 2013 TH135, 2003 UL3, 162781, 11398
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 7 in MPEC 2013-U38 -- 2013 TV135, 2013 TE6, 2013 SC25, 2013 RM43, 2013 PV6, 1990 UP, 10115
162Potenza Obs., 1 in MPEC 2013-U38 -- 9950
L04ROASTERR-1 Obs., 2 in MPEC 2013-U38 -- 162566, 1627
Y00SONEAR Obs. in Brazil, 9 in MPEC 2013-U38 -- 2013 TB80, 1990 UP, 87684, 162913, 162694, 6063, 5863, 3361, 1627
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2013-U39 -- 2013 UX2
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-U40 -- 2013 UB3
G403Tony Evans in Portugal via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2013-U38 -- 1981
G404Don Cranford, Jr. in North Carolina via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2013-U38 -- 2013 TV135
J84South Obs. in England, 1 in MPEC 2013-U38 -- 2001 AV43
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2013-U38 -- 2013 HG20
291Spacewatch 1.8m telescope in Arizona, 15 in MPECs 2013-U38, 2013-U40, 2013-U42 & 2013-U43 -- 2013 UG1, 2013 UF3, 2013 UE3, 2013 UE1, 2013 UB3, 2013 UB1, 2013 TZ5, 2013 TV135, 2013 TO69, 2013 TJ135, 2013 TE135, 2013 SE21, 2013 SC25, 2013 RR5, 2013 RJ74
926Tenagra II Obs. in Arizona, 7 in MPEC 2013-U38 -- 2013 UX, 2013 UK, 2013 UC, 2013 TT135, 2013 TC136, 375505, 2212
718Wiggins Obs. in Utah, 1 in MPEC 2013-U38 -- 2013 TV135
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 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.





Notes for Today's Latest Risk Assessments
2013 UR1NEODyS14002050-206742.29e-06-6.54-6.610NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2013-10-23.381 to 2013-10-24.201."
2013 UG1JPL Sentry1400R E M O V E DJPL: Risk listing removed at 1326 UTC.
2013 TV135JPL Sentry15442032-204724.8e-05-1.27-1.281JPL: "Analysis based on 304 observations spanning 16.087 days (2013-Oct-08.85531 to 2013-Oct-24.94281)." Diameter approximately 0.440 km. from mean, weighted H=19.4.
NEODyS14002032-209831.04e-04-0.95-0.951NEODyS: "Based on 307 optical observations (of which 3 are rejected as outliers) from 2013-10-08.856 to 2013-10-24.944."

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 25 October '13

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

2205Grabbed MPEC 2013-U40 - 2013 UB3 - see above
Grabbed MPEC 2013-U41 - 2013 UC3 - see above
Grabbed MPEC 2013-U42 - 2013 UE3 - see above
Grabbed MPEC 2013-U43 - 2013 UF3 - see above
1743Updated Traffic Report
1544Noted that JPL Sentry has updated its 2013 TV135 risk assessment - see above
Grabbed MPEC 2013-U39 - 2013 UX2 - see above
1400Noted that NEODyS has updated its 2013 TV135 risk assessment - see above
Noted that JPL Sentry has removed 2013 UG1 as an impact risk - see above
Noted that NEODyS has posted 2013 UR1 as an impact risk - see above
Grabbed MPEC 2013-U38 - Daily Orbit Update - see above