Contents  on 27 July '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 27 July '13

One object reported inside ten LD

One asteroid is reported to be possibly inside ten lunar distances (LD) of our planet today. 2006 BL8 may be exiting ten LD, traveling from 9.6 to 10.5 LD*. Headed our way next, 2003 DZ15 arrives inside ten LD tomorrow.

This report was generated at 1402 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. "LD*" indicates some passage uncertainty. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 27 July '13

The MPC's NEO Confirmation Page has 6 listings

When last checked at 2250 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had six objects listed. Of these, one was a "one nighter." So far The Tracking News has counted a total of 21 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 27 July '13

Minor Planet Electronic Circulars

As of last check at 2250 UTC, there have been sixteen MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts. No Daily Orbit Update DOU MPEC has been posted yet, so visit the MPC Status Page for possible explanation.

MPEC 2013-O55 - "23:03 UT" - 2013 ND24

MPEC 2013-O54 - "22:40 UT" - Comet C/2013 O3 (McNaught)

MPEC 2013-O53 - "22:11 UT" - Comet P/2013 O2 (Panstarrs)

MPEC 2013-O52 - "21:00 UT" - P/1998 Y2 = 2013 O1 (Li)

MPEC 2013-O51 - "20:17 UT" - 2013 NC24

MPEC 2013-O50 - "12:28 UT" - 2013 OU3

MPEC 2013-O49 - "12:24 UT" - 2013 OT3

MPEC 2013-O48 - "12:20 UT" - 2013 OS3

MPEC 2013-O47 - "12:17 UT" - 2013 OR3

MPEC 2013-O46 - "12:12 UT" - 2013 OQ3

MPEC 2013-O45 - "12:09 UT" - 2013 OP3

MPEC 2013-O44 - "12:05 UT" - 2013 OO3

MPEC 2013-O43 - "12:01 UT" - 2013 NB24

MPEC 2013-O42 - "11:57 UT" - 2013 NA24

MPEC 2013-O41 - "11:53 UT" - 2013 NZ23

MPEC 2013-O40 - "03:52 UT" - 2010 OL100

Observers  on 27 July '13

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2013-O54 -- C/2013 O3
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPECs 2013-O43, 2013-O44, 2013-O45, 2013-O46, 2013-O47, 2013-O48, 2013-O49, 2013-O50 & 2013-O53 -- 2013 OU3, 2013 OT3, 2013 OS3, 2013 OR3, 2013 OQ3, 2013 OP3, 2013 OO3, P/2013 O2, 2013 NB24
I47Auger Obs. in Argentina, 1 in MPEC 2013-O52 -- P/2013 O1
Q68Blue Mountains Obs. in New South Wales, 1 in MPEC 2013-O54 -- C/2013 O3
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPECs 2013-O53 & 2013-O54 -- C/2013 O3, P/2013 O2
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2013-O54 -- C/2013 O3
E94Gisborne Obs. in New Zealand, 1 in MPEC 2013-O54 -- C/2013 O3
W86LCOGT Cerro Tololo B in Chile, 4 in MPECs 2013-O43, 2013-O46, 2013-O47 & 2013-O54 -- 2013 OR3, 2013 OQ3, C/2013 O3, 2013 NB24
W87LCOGT Cerro Tololo C in Chile, 1 in MPEC 2013-O50 -- 2013 OU3
K91LCOGT Sutherland A in South Africa, 2 in MPECs 2013-O42 & 2013-O54 -- C/2013 O3, 2013 NA24
K92LCOGT Sutherland B in South Africa, 1 in MPEC 2013-O46 -- 2013 OQ3
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-O40 -- 2010 OL100
568_Marco Micheli on Mauna Kea in Hawaii, 3 in MPECs 2013-O41, 2013-O51 & 2013-O55 -- 2013 NZ23, 2013 ND24, 2013 NC24
F51Pan-STARRS 1 (PS1) in Hawaii, 13 in MPECs 2013-O41, 2013-O42, 2013-O43, 2013-O44, 2013-O45, 2013-O46, 2013-O47, 2013-O48, 2013-O49, 2013-O50, 2013-O51, 2013-O53 & 2013-O55 -- 2013 OU3, 2013 OT3, 2013 OS3, 2013 OR3, 2013 OQ3, 2013 OP3, 2013 OO3, P/2013 O2, 2013 NZ23, 2013 ND24, 2013 NC24, 2013 NB24, 2013 NA24
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2013-O54 -- C/2013 O3
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2013-O52 & 2013-O54 -- C/2013 O3, P/2013 O1
I89iTelescope Obs. Nerpio in Spain, 1 in MPEC 2013-O53 -- P/2013 O2
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 3 in MPECs 2013-O52, 2013-O53 & 2013-O54 -- C/2013 O3, P/2013 O2, P/2013 O1
Q622program code 2 via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-O54 -- C/2013 O3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 July '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2250 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 OS3JPL Sentry1356201513.1e-10-4.47-4.470JPL: "Analysis based on 7 observations spanning 1.8268 days (2013-Jul-16.52591 to 2013-Jul-18.352721)." Diameter approximately 0.750 km. from mean, weighted H=18.3.
NEODyS13562015-2081105.89e-10-4.38-4.680NEODyS: "Based on 7 optical observations (of which 0 are rejected as outliers) from 2013-07-16.527 to 2013-07-18.353."

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 27 July '13

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

2250Grabbed MPEC 2013-O53 - Comet P/2013 O2 (Panstarrs) - see above
Grabbed MPEC 2013-O54 - Comet C/2013 O3 (McNaught) - see above
Grabbed MPEC 2013-O55 - 2013 ND24 - see above
2100Grabbed MPEC 2013-O52 - P/1998 Y2 = 2013 O1 (Li) - see above
2004Grabbed MPEC 2013-O51 - 2013 NC24 - see above
1402Generated Traffic Report
1356Noted that JPL Sentry has posted 2013 OS3 as an impact risk - see above
Noted that NEODyS has posted 2013 OS3 as an impact risk - see above
Grabbed MPEC 2013-O41 - 2013 NZ23 - see above
Grabbed MPEC 2013-O42 - 2013 NA24 - see above
Grabbed MPEC 2013-O43 - 2013 NB24 - see above
Grabbed MPEC 2013-O44 - 2013 OO3 - see above
Grabbed MPEC 2013-O45 - 2013 OP3 - see above
Grabbed MPEC 2013-O46 - 2013 OQ3 - see above
Grabbed MPEC 2013-O47 - 2013 OR3 - see above
Grabbed MPEC 2013-O48 - 2013 OS3 - see above
Grabbed MPEC 2013-O49 - 2013 OT3 - see above
Grabbed MPEC 2013-O50 - 2013 OU3 - see above
0339Grabbed MPEC 2013-O40 - 2010 OL100 - see above