Contents  on 15 July '17

NOTE:  These A/CC news pages will update less often for an extended period. All discoveries and observing credits will be reported, but we may miss some interim impact risk assessments and undercount NEOCP efforts, and there may be some gaps in our traffic reporting for Earth's Busy Neighborhood.

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 15 July '17

Three objects reported inside ten LD

There are three minor objects reported passing inside ten lunar distances (LD) of Earth today. Risk-listed 2017 NT5 exits Earth's SOI, heading out from 1.84 to 6.12 LD. 2017 MR8 comes its closest to our planet on this passage -- 3.31 LD at 0213 UTC, while 2017 NK2 is outbound from 6.98 to 8.24 LD. Tomorrow NHATS target 2017 BS5 comes within ten LD.

This report was generated at 1711 UTC with follow-up in today's DOU MPEC for 2017 NT5, 2017 MR8, and departed objects 2017 MC4 and radar target 2017 CS, plus distant 2007 MB4

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 presently 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 15 July '17

The MPC's NEO Confirmation Page has 21 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 21 objects listed. Of these, ten were "one nighters." So far The Tracking News has counted a total of 24 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 15 July '17

Minor Planet Electronic Circulars

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

MPEC 2017-N78 - "13:18 UT" - S/2003 J 3

<< DOU on 15 July '17 >>  MPEC 2017-N77 - "11:59 UT" - Daily Orbit Update

MPEC 2017-N76 - "11:44 UT" - 2014 GE35

Observers  on 15 July '17

Twelve observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPEC 2017-N77 -- 2017 NH, 2017 CS, 2017 BM31, 90075, 366733, 232368, 20460, 190166, 142040, 11398, 106589
T05ATLAS Haleakala in Hawaii, 8 in MPEC 2017-N77 -- 2017 NS5, 2014 YC15, 2011 NP, 88254, 495959, 136923, 6053, 5751
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2017-N77 -- 190166
R58Beverly-Begg Obs., 1 in MPEC 2017-N77 -- 154589
160Castelmartini Obs. in Italy, 4 in MPEC 2017-N77 -- 2017 NH, 2017 MR8, 2017 MC4, 2007 MB4
734Farpoint Obs. in Kansas, 1 in MPEC 2017-N77 -- 2017 MT8
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-N77 -- 6050
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2017-N77 -- 142561
J69North Obs. in England, 2 in MPEC 2017-N77 -- 2017 NH, 190166
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPEC 2017-N77 -- 490684, 405427, 333755, 219021, 16912, 162273
Y00SONEAR in Brazil, 1 in MPEC 2017-N77 -- 2017 NT5
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2017-N76 -- 2014 GE35
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 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 NT5NEODyS18552050-211592.23e-07-5.67-6.20NEODyS #2 for the day: "Based on 86 optical observations (of which 0 are rejected as outliers) from 2017-06-23.461 to 2017-07-14.342."
JPL Sentry15122050-211565.77314e-07-5.23-5.670JPL: Computed at 07:55 today Pacific time based on 86 observations spanning 20.881 days (2017-Jun-23.45994 to 2017-Jul-14.34098). Diameter approximately 0.090 km. from weighted mean H=22.89.
2017 MB1NEODyS0100209811.0e-07-3.87-3.870NEODyS: "Based on 231 optical observations (of which 1 are rejected as outliers) from 2017-06-19.315 to 2017-07-13.548."

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 15 July '17

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

1855Noted that NEODyS has updated its 2017 NT5 risk assessment - see above
1711Generated Traffic Report
1512Noted that JPL Sentry has updated its 2017 NT5 risk assessment - see above
1333Grabbed MPEC 2017-N78 - S/2003 J 3 - see above
1300Grabbed MPEC 2017-N76 - 2014 GE35 - see above
Grabbed MPEC 2017-N77 - Daily Orbit Update - see above
0100Noted that NEODyS has updated its 2017 MB1 risk assessment - see above
Noted that NEODyS has updated its 2017 NT5 risk assessment - see above