Contents on 28 July '18
- Traffic Report -- no objects
- IAU Minor Planet Center
- Observers -- three observers
- Impact Risk Monitoring -- one object
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:
- Consolidated Risk Tables - the CRT page
Of 947 risk-listed objects, 22 have had news in the last 31 days. Updated at 1300 UTC on 28 July.
- Ephemerides for risk-listed objects & close passers
- News archive (old) & news image catalog (discontinued)
- Object Links - mainly for radar targets & close passers (mostly discontinued)
- Observing Campaigns (old)
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 28 July '18
No objects reported inside ten LD
Yes, we have no asteroidal or cometary objects reported within ten lunar distances (LD) of Earth today. Next known to be coming to the neighborhood is 2018 OZ, which arrives inside ten LD on August 3rd.
|N O N E|
|Approaching Traffic - sorted by 10-LD bubble entry date|
|Earth passage||I D||~Size||Distance today||Inside ten LD||Notes|
|7.0 LD Aug. 6*||2018 OZ||33 m||19.7 from 21.7 LD||Aug. 3 - 9||Earth passage uncertainty +/- 24 mins.*, NHATS target|
|9.36 LD Aug. 27||2018 LQ2||37 m||12.83 from 12.99 LD||Aug. 17 - Sept. 6||NHATS target|
|4.22 LD Aug. 29||1998 SD9||49 m||79.78 from 82.76 LD||Aug. 25 - Sept. 2|
This report was generated at 2141 UTC with the recovery of distant and dim 2017 OM1 (MPEC).
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. "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 now so close. 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 28 July '18
The MPC's NEO Confirmation Page has 4 listings
When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four objects listed. Of these, three were "one nighters."
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 28 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. No Daily Orbit Update DOU MPEC has been posted yet, so visit the MPC Status Page for possible explanation.
MPEC 2018-O48 - "00:26 UT" - 2017 OM1
Observers on 28 July '18
Three observers appear in today's MPEC.
|Code||Observer / observatory|
|309&||Marco Micheli via Cerro Paranal in Chile, 1 in MPEC 2018-O48 -- 2017 OM1|
|T12||UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-O48 -- 2017 OM1|
|T14||UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2018-O48 -- 2017 OM1|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 28 July '18
Notes for Today's Latest Risk Assessments
|2017 OM1||JPL Sentry||1300||R E M O V E D||JPL: Risk listing removed at 0137 UTC today|
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.