Contents  on 27 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 27 July '17

Three objects reported inside ten LD

Three minor objects are reported moving inside ten lunar distances (LD) of our home world today. NHATS target 2017 BS5 is outbound from 5.19 to 6.28 LD and risk-listed 2017 OM1 from 5.89 to 9.29 LD, and 2017 OE1 leaves our ten-LD traffic reporting zone, moving from 9.72 to 12.01 LD.

This report was generated at 1622 UTC with follow-up in today's DOU MPEC for 2017 OM1 and departed objects risk-listed intruder 2017 OO1 and 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 27 July '17

The MPC's NEO Confirmation Page has 102 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 102 objects listed. Of these, 74 were "one nighters." So far The Tracking News has counted a total of 104 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 27 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 27 July '17 >>  MPEC 2017-O55 - "12:10 UT" - Daily Orbit Update

Observers  on 27 July '17

Nineteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2017-O55 -- 2017 OO1, 2017 OM1, 2017 OF1, 2017 OD1, 2017 NU6, 2017 MQ8, 2017 MO7
T05ATLAS Haleakala in Hawaii, 10 in MPEC 2017-O55 -- 2001 NJ6, 88254, 496005, 495959, 438452, 385580, 341816, 152964, 136923, 5751
T08ATLAS Mauna Loa in Hawaii, 10 in MPEC 2017-O55 -- 54789, 52762, 495960, 304640, 154144, 142561, 138925, 12538, 100926, 2329
160Castelmartini Obs. in Italy, 6 in MPEC 2017-O55 -- 2017 BM31, 2011 ED78, 190166, 142040, 136818, 11398
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2017-O55 -- 2016 QE84
F51Pan-STARRS 1 (PS1) in Hawaii, 22 in MPEC 2017-O55 -- 2017 MD3, 2017 HV3, 2016 AA9, 2014 QL390, 2014 ON344, 2013 PE26, 2010 VD72, 2010 TH19, 2007 TG15, 69230, 452561, 408752, 399446, 349063, 306367, 27002, 170891, 16657, 152964, 137044, 5751, 4660
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 10 in MPEC 2017-O55 -- 2017 OL1, 2017 OD1, 2017 MY2, 2017 MQ8, 2017 GQ6, 2017 CS, 2017 BM31, 2015 FO124, 2014 YC15, 2014 SR339
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPEC 2017-O55 -- 441825, 436771, 5869
W25RMS Obs., 6 in MPEC 2017-O55 -- 2017 OG1, 2017 KR34, 366733, 304640, 294739, 142561
L04ROASTERR-1 in Romania, 2 in MPEC 2017-O55 -- 2017 OL1, 2017 NM6
Y28Sertao de Itaparica Obs. in Brazil, 1 in MPEC 2017-O55 -- 2016 QE84
G40!M. Kumrucu-Lohmiller in Massachusetts via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-O55 -- 481394
W885M. Kumrucu-Lohmiller in Massachusetts via Chile Obs. in Chile, 2 in MPEC 2017-O55 -- 2017 HW48, 1989 VB
Y00SONEAR in Brazil, 3 in MPEC 2017-O55 -- 2001 NJ6, 495858, 438452
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2017-O55 -- 2017 OA, 2016 VS5, 2006 OH15
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-O55 -- 138925
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-O55 -- 136818
926Tenagra II Obs. in Arizona, 1 in MPEC 2017-O55 -- 2017 FJ90
T09UH/Tholen NEO Follow-Up Subaru Telescope in Hawaii, 1 in MPEC 2017-O55 -- 2017 NR6
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 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 Sentry15302115-211518.463e-07-6.19-6.190JPL: Computed at 08:04 today Pacific time based on 85 observations spanning 2.7737 days (2017-Jul-23.36054 to 2017-Jul-26.134203). Diameter approximately 0.042 km. from weighted mean H=24.53.
NEODyS1350211512.96e-07-6.64-6.640NEODyS: "Based on 82 optical observations (of which 0 are rejected as outliers) from 2017-07-23.361 to 2017-07-25.954."
2017 OM1JPL Sentry15302084-211362.2939371e-06-4.92-5.210JPL: Computed at 08:11 today Pacific time based on 132 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.
NEODyS13502084-2117153.88e-06-4.69-5.020NEODyS: "Based on 126 optical observations (of which 4 are rejected as outliers) from 2017-07-22.508 to 2017-07-25.100."
2017 NR6NEODyS1350R E M O V E D-

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 27 July '17

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

1622Generated Traffic Report
1530Noted 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
1350Noted that NEODyS has removed 2017 NR6 as an impact risk - see above
Noted that NEODyS has updated its 2017 OM1 risk assessment - see above
Noted that NEODyS has updated its 2017 OO1 risk assessment - see above
Grabbed MPEC 2017-O55 - Daily Orbit Update - see above