Contents  on 20 April '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 20 April '13

Two objects reported inside ten LD

There are two asteroids reported to be within ten lunar distances (LD) of Earth today. 2013 GH66 is outbound from 4.62 to 4.87 LD and 2013 GH23 from 5.55 to 6.41 LD. No other objects are known to come inside our ten-LD reporting "bubble" until late July.

This report was generated at 1445 UTC with today's DOU MPEC carrying more observations of departed 2013 HO from within its discovery arc, plus observation of distant 68216 2001 CV26 and of 2013 ET from early March.

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 20 April '13

The MPC's NEO Confirmation Page has 43 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 43 objects listed. Of these, nineteen were "one nighters."

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 20 April '13

Minor Planet Electronic Circulars

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

<< DOU on 20 Apr. '13 >>  MPEC 2013-H24 - "06:03 UT" - Daily Orbit Update

Observers  on 20 April '13

A total of 20 observers appear in today's MPEC.

CodeObserver / observatory
I99Blanquita Obs. in Spain, 4 in MPEC 2013-H24 -- 2013 FY13, 22771, 5645, 1685
160Castelmartini Obs. in Italy, 6 in MPEC 2013-H24 -- 2013 HO, 2009 SC15, 2002 JW15, 354952, 274855, 4034
703Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2013-H24 -- 2013 GR38, 2007 JZ20, 2001 GQ2, 350988
448Desert Moon Obs. in New Mexico, 4 in MPEC 2013-H24 -- 2013 GW68, 2013 GR66, 2008 SE85, 275974
F658David Tholen's team in Hawaii via Faulkes Telescope North in Hawaii, 3 in MPEC 2013-H24 -- 2013 GR38, 2013 GG69, 99942
C73Galati Obs. in Romania, 4 in MPEC 2013-H24 -- 2013 FY13, 274855, 7888, 4034
K38M57 Obs., 1 in MPEC 2013-H24 -- 350988
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-H24 -- 2013 GF84
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2013-H24 -- 2013 FA8, 161998
0892Oleksandr V. Shulga via Nikolaev Obs. in the Ukraine, 6 in MPEC 2013-H24 -- 2013 GA80, 2013 FY13, 2013 ET, 2010 GY6, 359592, 4034
I41Palomar Transient Factory (PTF) in southern California, 2 in MPEC 2013-H24 -- 276732, 139289
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPEC 2013-H24 -- 2013 GR38, 2013 GK69, 2010 GY6, 40267, 164201
C48Sayn Solar Obs. in Russia, 3 in MPEC 2013-H24 -- 2013 HQ, 2013 HO, 2013 GZ79
204Schiaparelli Obs. in Italy, 11 in MPEC 2013-H24 -- 2013 GX79, 2013 GV38, 2013 GS66, 2013 GR38, 2013 GF, 2013 FY13, 2013 FQ10, 2012 XO111, 2012 XF55, 2010 SO16, 2008 SE85
645Sloan Digital Sky Survey (SDSS) in New Mexico, 2 in MPEC 2013-H24 -- 2013 AB53, 6456
G401program code 1 via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2013-H24 -- 4034
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2013-H24 -- 66391
291Spacewatch 1.8m telescope in Arizona, 5 in MPEC 2013-H24 -- 2013 GY7, 2013 GV68, 2013 GU38, 2013 GR38, 2013 GG69
718Wiggins Obs. in Utah, 2 in MPEC 2013-H24 -- 2013 GV68, 2013 GK69
H06iTelescope Obs. Mayhill in New Mexico, 5 in MPEC 2013-H24 -- 2013 FY13, 68216, 359592, 350988, 274855
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 April '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 GG69JPL Sentry14422030-208994.7e-08-3.90-3.990JPL: "Analysis based on 29 observations spanning 9.7877 days (2013-Apr-10.43133 to 2013-Apr-20.21903)." Diameter approximately 0.609 km. from mean, weighted H=18.7.

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 20 April '13

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

1445Generated Traffic Report
1442Noted that JPL Sentry has updated its 2013 GG69 risk assessment - see above
Grabbed MPEC 2013-H24 - Daily Orbit Update - see above