Contents  on 26 July '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 July '17

Three objects reported inside ten LD

Three asteroids are known to be within ten lunar distances (LD) of Earth today, all of them outbound. Risk-listed 2017 OM1 moves away from 2.95 to 5.89 LD, NHATS target 2017 BS5 from 4.23 to 5.19 LD, and 2017 OE1 from 8.65 to 9.72 LD.

This report was updated at 2324 UTC with first follow-up for departed risk-listed intruder 2017 OO1 in today's DOU MPEC along with continuing follow-up for 2017 OM1 and 2017 BS5. Your first local asteroid traffic report was generated at 0940 UTC, noting that yesterday the discoveries of two departed objects were announced: 2017 OP1 (MPEC), which went past our planet at 8.84 LD on July 19th, and risk-listed intruder 2017 OO1 (MPEC), which went by us at 0.33 LD and past the Moon at 0.92 LD on July 21st. The DOU MPEC yesterday carried first follow-up for 2017 OM1 and continuing observation of departed radar target 2017 CS

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.

NEOCP Activity  on 26 July '17

The MPC's NEO Confirmation Page has 76 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 76 objects listed. Of these, 57 were "one nighters."

New MPECs  on 26 July '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 26 July '17 >>  MPEC 2017-O54 - "11:59 UT" - Daily Orbit Update

Observers  on 26 July '17

Eighteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 22 in MPEC 2017-O54 -- 2017 NV5, 2017 NM6, 2017 MN7, 2017 MM, 2017 MG3, 2017 MD4, 2017 MA4, 2017 HW48, 2017 HV3, 2017 FH90, 2017 BS5, 2017 BM31, 2016 VS5, 2014 LU14, 2012 PN28, 2011 ED78, 374449, 329774, 248590, 222165, 222073, 142561
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2017-O54 -- 2017 NM6, 68950, 66391
T08ATLAS Mauna Loa in Hawaii, 10 in MPEC 2017-O54 -- 2017 BM31, 2015 FO124, 2014 YC15, 2011 ED78, 68348, 488494, 422699, 366733, 11398, 5143
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPEC 2017-O54 -- 2017 NS6, 2015 FO124, 484757
K88GINOP-KHK in Hungary, 1 in MPEC 2017-O54 -- 2017 OL1
J95Great Shefford Obs. in England, 2 in MPEC 2017-O54 -- 2017 OO1, 2017 OM1
511Haute Provence Obs. in Germany, 1 in MPEC 2017-O54 -- 2017 OO1
W19Kalamazoo Obs. in Michigan, 3 in MPEC 2017-O54 -- 190166, 138925, 11398
950.EURONEAR via La Palma in the Canary Islands, 1 in MPEC 2017-O54 -- 2001 NJ6
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-O54 -- 2017 OM1
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2017-O54 -- 3752
F51Pan-STARRS 1 (PS1) in Hawaii, 20 in MPEC 2017-O54 -- 2017 MY8, 2017 FR2, 2016 CL32, 2016 AG165, 2015 NY13, 2014 QX432, 2012 CO46, 2008 AZ110, 2005 FH, 488494, 480934, 422699, 368565, 308127, 27002, 256670, 143409, 141874, 141447, 4341
L04ROASTERR-1 in Romania, 1 in MPEC 2017-O54 -- 190166
W885M. Kumrucu-Lohmiller in Massachusetts via Chile Obs. in Chile, 1 in MPEC 2017-O54 -- 2017 HW48
Y00SONEAR in Brazil, 1 in MPEC 2017-O54 -- 2008 MH1
291Spacewatch 1.8m telescope in Arizona, 9 in MPEC 2017-O54 -- 2017 NS5, 2017 NR6, 2017 NK, 2017 MK7, 2017 FJ90, 2014 KP4, 2011 OB, 2011 CC22, 2009 HA21
C51WISE in Earth polar orbit, 5 in MPEC 2017-O54 -- 2014 XT3, 90075, 88254, 136582, 1980
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2017-O54 -- 2017 NM6, 2011 ED78, 2329
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 July '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
2017 OO1JPL Sentry22172115-211517.585e-07-6.24-6.240JPL: Computed at 08:04 today Pacific time based on 82 observations spanning 2.5927 days (2017-Jul-23.36054 to 2017-Jul-25.95321). Diameter approximately 0.042 km. from weighted mean H=24.52.
NEODyS0927211515.91e-08-7.29-7.290NEODyS: "Based on 64 optical observations (of which 0 are rejected as outliers) from 2017-07-23.361 to 2017-07-25.217."
2017 OM1JPL Sentry22172084-211382.1959851e-06-4.93-5.230JPL: Computed at 08:11 today Pacific time based on 125 observations spanning 2.5921 days (2017-Jul-22.50692 to 2017-Jul-25.098999). Diameter approximately 0.073 km. from weighted mean H=23.32.
NEODyS09272084-211793.71e-06-4.69-4.990NEODyS: "Based on 102 optical observations (of which 4 are rejected as outliers) from 2017-07-22.508 to 2017-07-24.949."

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 July '17

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

2324Updated Traffic Report
2217Noted that JPL Sentry has updated its 2017 OM1 risk assessment - see above
Noted that JPL Sentry has updated its 2017 OO1 risk assessment - see above
Grabbed MPEC 2017-O54 - Daily Orbit Update - see above
0927Noted that NEODyS has updated its 2017 OM1 risk assessment - see above
Noted that NEODyS has posted 2017 OO1 as an impact risk - see above