Contents  on 23 July '18

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 objects, and there may be some days without a traffic report 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 '18

Two objects reported inside ten LD

There are two small objects reported inside ten lunar distances (LD) of our home world today. Nearest is 2018 OQ, which moves away from 6.83 to 7.99 LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 1.0, 2.41, 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
1.40 LD July 17 2018 NM 18 m  8.76 to 10.25 LD July 10 - 23 NHATS target, exits ten LD
3.72 LD July 18 2018 OQ 16 m  6.83 to 7.99 LD July 11 - 25 NHATS target
Approaching - sorted by 10-LD bubble entry date
9.36 LD Aug. 27 2018 LQ2 37 m  13.65 from 13.81 LD Aug. 17 - Sept. 6 NHATS target - DOU
4.22 LD Aug. 29 1998 SD9 49 m  95.31 from 98.63 LD Aug. 25 - Sept. 2

This report was generated at 1710 UTC with first follow-up for departed 2018 NY (9.02 days added to 0.84-day discovery arc) in today's DOU MPEC along with follow-up for approaching 2018 LQ2 and departed objects 2018 NH and risk-listed 2018 MC7.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting about transient natural objects that approach our planet's 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 temporal 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 '18

The MPC's NEO Confirmation Page has 15 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fifteen objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of seventeen 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 '18

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 23 July '18 >>  MPEC 2018-O37 - "12:03 UT" - Daily Orbit Update

Observers  on 23 July '18

Ten observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPEC 2018-O37 -- 2018 OM, 2018 OB, 2018 NY, 2018 NN3, 2018 NJ4, 2018 NH, 2018 MR8, 2018 MC7, 2018 LQ2, 2018 FC1, 2017 MU8, 2010 VB72, 363163
T05ATLAS Haleakala in Hawaii, 12 in MPEC 2018-O37 -- 2018 NP1, 2018 NN4, 2018 KE3, 2017 YE5, 2015 OH, 2009 SK104, 511523, 25916, 17274, 137125, 6569, 1916
T08ATLAS Mauna Loa in Hawaii, 10 in MPEC 2018-O37 -- 2011 GA62, 68950, 66391, 65996, 398188, 21277, 13553, 11500, 2061, 719
J95Great Shefford Obs. in England, 1 in MPEC 2018-O37 -- 2018 NE1
I89'Steven M. Tilley in Louisiana via iTelescope Obs. Nerpio in Spain, 1 in MPEC 2018-O37 -- 2018 MR8
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-O37 -- 2018 OM
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2018-O37 -- 86324
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-O37 -- 54401
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2018-O37 -- 2018 LV5
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-O37 -- 265482
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 July '18

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
2018 OMNEODyS1930R E M O V E D-
2018 MC7NEODyS19302060-2117713.32e-04-4.15-4.560NEODyS: "Based on 40 optical observations (of which 1 are rejected as outliers) from 2018-06-21.395 to 2018-07-18.343."
JPL Sentry14402060-2109230.00151346187-3.45-3.460JPL: Computed at 07:02 today Pacific time based on 39 observations spanning 26.947 days (2018-Jun-21.39443 to 2018-Jul-18.341718). Diameter approximately 0.021 km. from weighted mean H=26.07.

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 '18

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

1930Noted that NEODyS has updated its 2018 MC7 risk assessment - see above
Noted that NEODyS has removed 2018 OM as an impact risk - see above
1710Generated Traffic Report
1440Noted that JPL Sentry has updated its 2018 MC7 risk assessment - see above
Grabbed MPEC 2018-O37 - Daily Orbit Update - see above