Contents  on 17 May '17

Asteroid/Comet Connection (A/CC) Resources:

The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection.

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. To keep track of what's new each day, watch the Chronology section.

Traffic Report  on 17 May '17

Three objects reported inside ten LD

Three minor objects are known to be flying within ten lunar distances (LD) of Earth today. 2017 HU49 is the nearest and heads away from 5.92 to 6.07 LD.

Earth passage I D ~Size Distance Today  Notes
0.14 LD May 42017 JB2 5 m  8.76 to 9.41 LD intruder, risk
5.09 LD May 152017 JM2 46 m  7.93 to 10.67 LD exits ten LD
5.56 LD May 112017 HU49 18 m  5.92 to 6.07 LD
7.93 LD May 292017 CS 446 m  < 10 LD May 26, radar target

This report was generated at 1650 UTC with first follow-up in today's DOU MPEC for departed 2017 JP2, adding 6.26 days to its 2.79-day discovery arc.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting on transient natural objects that approach the actually significant gravitational sphere of influence (SOI), which has a radius of about 2.41 LD from Earth's center. This puts a focus on some of the most important and very best NEO observation work, representative of the much larger NEO discovery and tracking effort. Object distances are derived by A/CC from JPL Horizons data. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

Radar Astrometry  on 17 May '17

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data update noted at 1826 UTC when the database was dated 17 May

NEOCP Activity  on 17 May '17

The MPC's NEO Confirmation Page has 45 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 45 objects listed. Of these, 32 were "one nighters."

New MPECs  on 17 May '17

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 17 May '17 >>  MPEC 2017-K09 - "12:03 UT" - Daily Orbit Update

Observers  on 17 May '17

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

CodeObserver / observatory
X39Antares Obs., 1 in MPEC 2017-K09 -- 1036
251Arecibo in Puerto Rico, 1 in radar -- 41P
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2017-K09 -- 2017 HY50, 2017 HP49, 2017 HN3, 2017 HH, 2017 AC5, 2016 YU10, 2016 JP, 2013 CL118, 2011 ED78, 7888
160Castelmartini Obs. in Italy, 10 in MPEC 2017-K09 -- 2017 JD3, 2005 GL9, 475665, 456651, 222073, 190166, 163696, 100926, 7888, 1917
703Catalina Sky Survey (CSS) in Arizona, 26 in MPEC 2017-K09 -- 2017 JD3, 2016 JP, 85275, 66400, 54789, 488490, 488465, 483560, 474425, 405427, 39796, 276468, 274138, 252091, 222073, 175189, 163696, 138359, 138155, 136897, 13651, 5189, 4055, 3352, 3103, 1917
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2017-K09 -- 2016 VT2
K91LCOGT Sutherland A in South Africa, 1 in MPEC 2017-K09 -- 2005 MO13
K38M57 Obs. in Italy, 1 in MPEC 2017-K09 -- 2017 HY50
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-K09 -- 5626
C94MASTER-II Tunka in Russia, 1 in MPEC 2017-K09 -- 887
118Modra Obs. in Slovakia, 1 in MPEC 2017-K09 -- 2329
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2017-K09 -- 2017 JP2
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-K09 -- 11398
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2017-K09 -- 2014 MK27
D29Purple Mtn. Obs. Xuyi Station in China, 6 in MPEC 2017-K09 -- 2017 HK1, 2016 JP, 2005 MO13, 484517, 370307, 220124
587Sormano Obs. in Italy, 1 in MPEC 2017-K09 -- 2017 JF3
691Spacewatch 0.9m telescope in Arizona, 11 in MPEC 2017-K09 -- 2017 HT2, 2017 FP64, 2017 BL6, 2016 VY5, 2015 PQ291, 2014 JG78, 2012 EY11, 2008 SQ7, 474231, 467460, 462550
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2017-K09 -- 2017 FQ64, 2016 QC84, 2016 LE9, 2014 SR339
926Tenagra II Obs. in Arizona, 6 in MPEC 2017-K09 -- 2017 JV2, 2017 JU2, 2017 JP2, 2017 JB, 2017 GU6, 2017 FE1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-K09 -- 2017 FO128
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 May '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2358 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 NASA/JPL Sentry and NEODyS CLOMON2 risk pages.





Notes for Today's Latest Risk Assessments
2012 TC4NEODyS06002020-2116927.08e-05-4.95-5.860NEODyS: "Based on 311 optical observations (of which 0 are rejected as outliers) from 2012-10-04.468 to 2012-10-11.749."

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale (next 100 years)

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 17 May '17

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

1826Noted Radar Astrometry database update - see above
1650Generated Traffic Report
1530Grabbed MPEC 2017-K09 - Daily Orbit Update - see above
0600Noted that NEODyS has updated its 2012 TC4 risk assessment - see above