Contents  on 19 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 19 April '13

Three objects reported inside ten LD

Three visitors are reported flying inside a radius of ten lunar distances (LD) from our planet today. 2013 GH66 is outbound from 4.39 to 4.62 LD, 2013 GH23 comes its closest to Earth this time around, reaching 5.46 LD at 1412 UT, and 2013 GJ69 exits ten LD, traveling from 9.65 to 10.83 LD.

No other objects are known to be coming inside ten LD until late July.

This report was generated at 1327 UTC with observation of distant 68216 2001 CV26 in today's DOU MPEC.

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 19 April '13

The MPC's NEO Confirmation Page has 25 listings

When last checked at 2018 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 25 objects listed. Of these, sixteen were "one nighters." So far The Tracking News has counted a total of 27 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 19 April '13

Minor Planet Electronic Circulars

As of last check at 2017 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2013-H23 - "19:36 UT" - Comet C/2013 G9 (Tenagra)

MPEC 2013-H22 - "19:22 UT" - Comet C/2013 G8 (Panstarrs)

<< DOU on 19 Apr. '13 >>  MPEC 2013-H21 - "06:03 UT" - Daily Orbit Update

Observers  on 19 April '13

A total of 28 observers appear in today's MPECs.

CodeObserver / observatory
B54Ager Obs. in Spain, 1 in MPEC 2013-H21 -- 1627
B88Bigmuskie Obs. in Italy, 1 in MPEC 2013-H21 -- 2001 GQ2
300Bisei Spaceguard Center in Japan, 1 in MPEC 2013-H23 -- C/2013 G9
493Calar Alto Obs. in Spain, 2 in MPECs 2013-H22 & 2013-H23 -- C/2013 G9, C/2013 G8
160Castelmartini Obs. in Italy, 1 in MPEC 2013-H21 -- 2013 GE84
703Catalina Sky Survey (CSS) in Arizona, 3 in MPEC 2013-H21 -- 2009 BL2, 7888, 4034
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2013-H23 -- C/2013 G9
F65$Ernesto Guido in Italy via Faulkes Telescope North in Hawaii, 1 in MPEC 2013-H23 -- C/2013 G9
E89Geyserland Obs. in New Zealand, 3 in MPEC 2013-H21 -- 96189, 285263, 1036
203GiaGa Obs. in Italy, 3 in MPEC 2013-H21 -- 2013 FY13, 68216, 5645
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2013-H22 -- C/2013 G8
711McDonald Obs. in Texas, 2 in MPECs 2013-H22 & 2013-H23 -- C/2013 G9, C/2013 G8
118Modra Obs. in Slovakia, 1 in MPEC 2013-H23 -- C/2013 G9
C91Montevenere Obs., 2 in MPEC 2013-H21 -- 274855, 5645
474Mt. John Obs. in New Zealand, 1 in MPEC 2013-H21 -- 2013 ER89
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2013-H21 -- 356285, 141670
I41Palomar Transient Factory in southern California, 1 in MPEC 2013-H21 -- 2008 SE85
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2013-H21 & 2013-H22 -- 2013 GY73, C/2013 G8
233San Vito Obs. in Italy, 2 in MPEC 2013-H21 -- 3752, 1036
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2013-H21 -- 2008 GB110, 1988 TA
291Spacewatch 1.8m telescope in Arizona, 11 in MPEC 2013-H21 -- 2013 GZ73, 2013 GX79, 2013 GX68, 2013 GU79, 2013 GU68, 2013 GS38, 2013 GF69, 2013 FA8, 2013 BW76, 2010 KX7, 2009 LW2
A78Stia Obs. in Italy, 4 in MPEC 2013-H21 -- 2013 FY13, 66008, 137170, 11405
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-H23 -- C/2013 G9
I76Tesla Obs. in Spain, 1 in MPEC 2013-H21 -- 2013 FY13
D06Tuscolana Assoc. Obs., 1 in MPEC 2013-H21 -- 7888
718Wiggins Obs. in Utah, 1 in MPEC 2013-H21 -- 2013 FY13
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-H22 -- C/2013 G8
Q621program code 1 via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-H23 -- C/2013 G9
Q626program code 6 via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-H23 -- C/2013 G9
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 April '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2027 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 GZ73JPL Sentry1324R E M O V E DJPL: Risk listing removed at 0949 UTC.
2013 GF69JPL Sentry13242030-2112456.3e-07-3.57-4.000JPL: "Analysis based on 18 observations spanning 7.8241 days (2013-Apr-10.42368 to 2013-Apr-18.2478)." Diameter approximately 0.410 km. from mean, weighted H=19.6.

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 19 April '13

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

1948Grabbed MPEC 2013-H22 - Comet C/2013 G8 (Panstarrs) - see above
Grabbed MPEC 2013-H23 - Comet C/2013 G9 (Tenagra) - see above
1327Generated Traffic Report
1324Noted that JPL Sentry has updated its 2013 GF69 risk assessment - see above
Noted that JPL Sentry has removed 2013 GZ73 as an impact risk - see above
Grabbed MPEC 2013-H21 - Daily Orbit Update - see above