Contents  on 23 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 23 July '17

One object reported inside ten LD

One visitor is known to be passing inside ten lunar distances (LD) of Earth today. NHATS target 2017 BS5 comes its closest to our planet this time around, reaching 3.12 LD at 1916 UTC. Newly announced 2017 OE1 arrives inside ten LD tomorrow.

This report was generated at 1634 UTC with the discoveries announced late yesterday of 2017 OE1 and already departed 2017 OH1, which flew past us at 1.63 LD at 0149 UTC on July 19th. Today's DOU MPEC has follow-up for 2017 BS5 and 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 23 July '17

The MPC's NEO Confirmation Page has 10 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had ten objects listed. Of these, two were "one nighters." So far The Tracking News has counted a total of fourteen 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 23 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.

<< DOU on 23 July '17 >>  MPEC 2017-O42 - "11:59 UT" - Daily Orbit Update

MPEC 2017-O41 - "10:27 UT" - 2010 TP55

MPEC 2017-O40 - "02:36 UT" - 2013 QH48

Observers  on 23 July '17

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 16 in MPEC 2017-O42 -- 2017 NV5, 2017 NL2, 2017 NK, 2017 NH, 2017 MY2, 2017 MN7, 2017 MG4, 2017 MG3, 2017 MB1, 2017 CS, 2017 BS5, 2015 YR1, 495930, 20460, 190166, 11398
T08ATLAS Mauna Loa in Hawaii, 9 in MPEC 2017-O42 -- 2017 GQ6, 416584, 294739, 232368, 190166, 142464, 142040, 136818, 12538
G58Chabot Obs. in northern California, 2 in MPEC 2017-O42 -- 2017 NK, 2017 MU8
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 6 in MPECs 2017-O40 & 2017-O42 -- 2017 OF1, 2017 MD7, 2017 MD4, 2017 MB1, 2013 QH48, 496124
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-O42 -- 2017 OF1
K83Forti Obs., 1 in MPEC 2017-O42 -- 366733
157Frasso Sabino Obs. in Italy, 2 in MPEC 2017-O42 -- 470310, 190166
W92MASTER OAFA Obs., 1 in MPEC 2017-O42 -- 159467
K74Muensterschwarzach Obs. in Germany, 3 in MPEC 2017-O42 -- 2017 BS5, 68348, 1980
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2017-O42 -- 2017 FR2, 2008 CA6, 96631
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 19 in MPEC 2017-O42 -- 2017 NM6, 2017 MW4, 2017 GQ6, 2017 CS, 2017 BS5, 2017 BM31, 2014 YC15, 2014 SR339, 2011 NP, 68950, 496018, 494975, 422699, 366733, 294739, 190166, 142561, 138925, 106589
033Schwarzschild Obs. in Germany, 3 in MPEC 2017-O42 -- 2017 OG1, 2017 MO7, 2017 ML8
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2017-O42 -- 2016 AG165
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-O42 -- 138925
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-O41 -- 2010 TP55
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2017-O41 -- 2010 TP55
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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 MB1NEODyS2152209811.02e-07-3.92-3.920NEODyS: "Based on 409 optical observations (of which 13 are rejected as outliers) from 2017-06-19.315 to 2017-07-22.156."
JPL Sentry15302098-209811.496e-07-3.76-3.760JPL: Computed at 07:56 today Pacific time based on 405 observations spanning 32.841 days (2017-Jun-19.31418 to 2017-Jul-22.155211). Diameter approximately 0.590 km. from weighted mean H=18.80.

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 23 July '17

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

2152Noted that NEODyS has updated its 2017 MB1 risk assessment - see above
1634Generated Traffic Report
1530Noted that JPL Sentry has updated its 2017 MB1 risk assessment - see above
1249Grabbed MPEC 2017-O42 - Daily Orbit Update - see above
1209Grabbed MPEC 2017-O40 - 2013 QH48 - see above
Grabbed MPEC 2017-O41 - 2010 TP55 - see above