Contents  on 15 June '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 15 June '13

One object reported inside ten LD

One visitor is reported moving inside ten lunar distances (LD) of Earth today. 2013 LD2 leaves ten LD, moving from 8.98 to 10.09 LD. No other objects are known to be coming this close until late July.

This report was generated at 1310 UTC.

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 15 June '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, eleven were "one nighters." So far The Tracking News has counted a total of 36 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 15 June '13

Minor Planet Electronic Circulars

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

MPEC 2013-L74 - "18:53 UT" - 2013 LZ28

MPEC 2013-L73 - "18:49 UT" - 2013 LY28

MPEC 2013-L72 - "18:46 UT" - 2013 LX28

MPEC 2013-L71 - "18:42 UT" - 2013 LW28

MPEC 2013-L70 - "18:38 UT" - 2013 LV28

MPEC 2013-L69 - "18:28 UT" - 2013 LU28

<< DOU on 15 June '13 >>  MPEC 2013-L68 - "06:08 UT" - Daily Orbit Update

Observers  on 15 June '13

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

CodeObserver / observatory
169Airali Obs. in Italy, 1 in MPEC 2013-L68 -- 163364
H21Astronomical Research Obs. Westfield in Illinois, 18 in MPECs 2013-L68 & 2013-L74 -- 2013 LZ28, 2013 LK25, 2013 LG16, 2013 LF7, 2013 LF16, 2013 LE16, 2013 LB1, 2013 KY5, 2013 KJ6, 2013 JX2, 2013 JG29, 2013 HP11, 2012 VO76, 2009 QO5, 247156, 189973, 11405, 1866
703Catalina Sky Survey (CSS) in Arizona, 11 in MPEC 2013-L68 -- 2013 LK7, 2013 LE16, 2013 LC2, 2013 LB2, 2013 KN6, 2011 WU95, 2009 BL2, 2008 OX2, 354332, 21088, 3988
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPECs 2013-L68, 2013-L70 & 2013-L73 -- 2013 LY28, 2013 LV28, 2013 LE1, 2013 KR1, 2013 JB36, 2013 EW27, 2013 EV89, 2012 XY6
G58Chabot Obs. in northern California, 4 in MPEC 2013-L68 -- 2013 LK7, 2013 LK25, 2013 LH16, 2013 KB2
A27Eridanus Obs. in Germany, 1 in MPEC 2013-L68 -- 2013 JR28
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2013-L71 & 2013-L74 -- 2013 LZ28, 2013 LW28
J95Great Shefford Obs. in England, 3 in MPECs 2013-L69, 2013-L71 & 2013-L74 -- 2013 LZ28, 2013 LW28, 2013 LU28
695{Tomas Vorobjov in England via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPECs 2013-L69 & 2013-L71 -- 2013 LW28, 2013 LU28
K91LCOGT Sutherland A in South Africa, 2 in MPECs 2013-L70 & 2013-L72 -- 2013 LX28, 2013 LV28
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2013-L69 & 2013-L70 -- 2013 LV28, 2013 LU28
568_Marco Micheli on Mauna Kea in Hawaii, 2 in MPECs 2013-L72 & 2013-L73 -- 2013 LY28, 2013 LX28
C91Montevenere Obs., 1 in MPEC 2013-L68 -- 163249
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2013-L68, 2013-L69, 2013-L70, 2013-L71 & 2013-L74 -- 2013 LZ28, 2013 LW28, 2013 LV28, 2013 LU28, 2001 UX4, 277830
C23Olmen Obs. in Belgium, 1 in MPEC 2013-L68 -- 285263
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2013-L68, 2013-L72 & 2013-L73 -- 2013 LY28, 2013 LX28, 1972 RB
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2013-L68 -- 2013 LE16
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2013-L74 -- 2013 LZ28
H36Sandlot Obs. in Kansas, 3 in MPECs 2013-L71, 2013-L73 & 2013-L74 -- 2013 LZ28, 2013 LY28, 2013 LW28
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2013-L68 -- 2008 KZ5, 5332
291Spacewatch 1.8m telescope in Arizona, 8 in MPECs 2013-L68, 2013-L69, 2013-L72 & 2013-L74 -- 2013 LZ28, 2013 LX28, 2013 LU28, 2013 LT28, 2013 LH16, 2013 LG16, 2013 JL22, 2009 ND1
673!program code "!" (10) via Table Mtn. Obs. in southern California, 1 in MPEC 2013-L68 -- 2013 JR28
I76Tesla Obs. in Spain, 1 in MPEC 2013-L68 -- 2013 JR28
Z92West Park Obs., 1 in MPEC 2013-L68 -- 285263
718Wiggins Obs. in Utah, 3 in MPEC 2013-L68 -- 2013 JR28, 163249, 7888
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 June '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 LZ28JPL Sentry22022052-2089159.9e-07-4.61-4.740JPL: "Analysis based on 41 observations spanning 2.1630 days (2013-Jun-13.25363 to 2013-Jun-15.41665)." Diameter approximately 0.110 km. from mean, weighted H=22.4.
2013 LG16NEODyS16302048-205233.49e-06-2.75-2.780NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2013-06-07.414 to 2013-06-14.367."
JPL Sentry13082048-2111403.4e-06-2.79-2.830JPL: "Analysis based on 28 observations spanning 6.9523 days (2013-Jun-07.41346 to 2013-Jun-14.36575)." Diameter approximately 0.430 km. from mean, weighted H=19.5.

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 15 June '13

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

2202Noted that JPL Sentry has posted 2013 LZ28 as an impact risk - see above
1931Grabbed MPEC 2013-L69 - 2013 LU28 - see above
Grabbed MPEC 2013-L70 - 2013 LV28 - see above
Grabbed MPEC 2013-L71 - 2013 LW28 - see above
Grabbed MPEC 2013-L72 - 2013 LX28 - see above
Grabbed MPEC 2013-L73 - 2013 LY28 - see above
Grabbed MPEC 2013-L74 - 2013 LZ28 - see above
1630Noted that NEODyS has updated its 2013 LG16 risk assessment - see above
1310Generated Traffic Report
1308Noted that JPL Sentry has updated its 2013 LG16 risk assessment - see above
Grabbed MPEC 2013-L68 - Daily Orbit Update - see above