Contents  on 26 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 26 May '17

Four objects reported inside ten LD

Four minor objects are reported within ten lunar distances (LD) of Earth today. Risk-listed 2017 KH5 exits our planet's SOI, flying from 1.70 to 4.59 LD while 2017 KW4 is outbound from 4.02 to 5.54 LD and 2017 HU49 from 7.85 to 8.11 LD, and radar target 2017 CS enters the ten-LD space, slipping in from 10.90 to 9.61 LD.

This report was generated at 1748 UTC with first follow-up for departed 2017 KY4 in today's DOU MPEC along with additional observation of 2017 KH5 and continuing follow-up for 2017 KW4, 2017 CS, and distant 484402 2007 XH16.

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. "Distant" is used here to describe an object that has come within ten LD since A/CC began these traffic reports (2007) but is not now so close. 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.

NEOCP Activity  on 26 May '17

The MPC's NEO Confirmation Page has 61 listings

When last checked at 2330 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 61 objects listed. Of these, 33 were "one nighters." So far The Tracking News has counted a total of 65 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 26 May '17

Minor Planet Electronic Circulars

As of last check at 2330 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 26 May '17 >>  MPEC 2017-K60 - "12:03 UT" - Daily Orbit Update

MPEC 2017-K59 - "04:07 UT" - 2010 DN1

Observers  on 26 May '17

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2017-K60 -- 242191, 154144, 142561
T08ATLAS Mauna Loa in Hawaii, 11 in MPEC 2017-K60 -- 2017 GU6, 2005 GL9, 488465, 474425, 427643, 39796, 136923, 100926, 4503, 1980, 1917
K87Dettelbach Vineyard Obs., 1 in MPEC 2017-K60 -- 11398
J95Great Shefford Obs. in England, 1 in MPEC 2017-K60 -- 2017 KW4
511Haute Provence Obs. in Germany, 1 in MPEC 2017-K60 -- 2017 KE5
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2017-K59 -- 2010 DN1
474Mt. John Obs. in New Zealand, 2 in MPEC 2017-K60 -- 2017 KZ4, 2017 KB3
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPEC 2017-K60 -- 484517, 162273, 7888
J69North Obs. in England, 1 in MPEC 2017-K60 -- 66391
Z80Northolt Branch Obs. in England, 8 in MPEC 2017-K60 -- 2005 GL9, 66391, 252091, 222073, 190166, 137170, 100926, 6063
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2017-K60 -- 2017 CS
C23Olmen Obs. in Belgium, 1 in MPEC 2017-K60 -- 66391
F51Pan-STARRS 1 (PS1) in Hawaii, 16 in MPECs 2017-K59 & 2017-K60 -- 2017 FT2, 2016 AJ193, 2015 NU13, 2014 XT3, 2014 QX432, 2013 UP8, 2010 DN1, 89959, 488509, 484402, 427643, 242191, 189011, 18172, 159454, 142561
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 10 in MPEC 2017-K60 -- 2017 KT4, 2017 HY50, 2017 CS, 2011 ED78, 456651, 222073, 163696, 11398, 6063, 2329
D29Purple Mtn. Obs. Xuyi Station in China, 5 in MPEC 2017-K60 -- 2017 HN49, 2017 HH, 2011 ED78, 480934, 271480
W25RMS Obs., 5 in MPEC 2017-K60 -- 2017 HN3, 288592, 260141, 159560, 142561
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2017-K60 -- 2017 CS
Y00SONEAR in Brazil, 1 in MPEC 2017-K60 -- 138846
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-K60 -- 190166
I52Steward Obs. Mt. Lemmon Station in Arizona, 7 in MPEC 2017-K60 -- 2017 KZ4, 2017 KY4, 2017 KX4, 2017 KU4, 2017 KJ5, 2017 KG5, 2017 KA5
926Tenagra II Obs. in Arizona, 1 in MPEC 2017-K60 -- 2017 KH5
Z52The Studios Obs., 2 in MPEC 2017-K60 -- 11398, 2329
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 4 in MPEC 2017-K60 -- 2017 KB3, 2017 HP3, 2017 GT6, 2017 GM6
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 May '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2330 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
2017 KH5JPL Sentry15302067-207432.69691e-07-7.75-8.010JPL: Computed at 07:55 today Pacific time based on 45 observations spanning .97523 days (2017-May-24.39387 to 2017-May-25.3691). Diameter approximately 0.010 km. from weighted mean H=27.58.
NEODyS15302067-207433.45e-07-7.61-7.760NEODyS: "Based on 45 optical observations (of which 0 are rejected as outliers) from 2017-05-24.395 to 2017-05-25.370."
2017 KB3JPL Sentry15302063-2115338.800611e-06-5.24-5.930JPL: Computed at 08:04 today Pacific time based on 32 observations spanning 8.2327 days (2017-May-17.21791 to 2017-May-25.45063). Diameter approximately 0.035 km. from weighted mean H=24.90.
NEODyS15302063-2117256.12e-07-6.46-7.120NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2017-05-17.219 to 2017-05-24.446."
2010 XB73JPL Sentry15302023-2110502.783641e-07-5.16-5.960JPL: Computed at 20:52 April 7th Pacific time based on 18 observations spanning 1.0847 days (2010-Dec-14.13028 to 2010-Dec-15.21496). Diameter approximately 0.110 km. from weighted mean H=22.50.

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 26 May '17

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

1748Generated Traffic Report
1530Noted that JPL Sentry has updated its 2010 XB73 risk assessment - see above
Noted that JPL Sentry has updated its 2017 KB3 risk assessment - see above
Noted that NEODyS has updated its 2017 KB3 risk assessment - see above
Noted that JPL Sentry has updated its 2017 KH5 risk assessment - see above
Noted that NEODyS has updated its 2017 KH5 risk assessment - see above
Grabbed MPEC 2017-K60 - Daily Orbit Update - see above
0431Grabbed MPEC 2017-K59 - 2010 DN1 - see above