Contents  on 2 May '18

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 2 May '18

One object reported inside ten LD

One asteroid is reported to be within ten lunar distances (LD) of Earth today. 2018 HM2 is outbound from 8.91 to 9.33 LD.

Neighborhood Traffic
Earth passage I D ~Size Distance today  Inside ten LD Notes
8.72 LD April 30 2018 HM2 62 m  8.91 to 9.33 LD April 27 - May 4 NHATS target
Approaching (sorted by 10-LD bubble entry date)
6.2   LD May 8* 2016 JQ5 8 m  13.7 from 15.8 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  11.27 from 11.98 LD May 5 - 9 radar/NHATS target - DOU
6.48 LD May 9 388945 2008 TZ3 282 m  14.61 from 16.48 LD May 5 - 13
9.50 LD May 29 68347 2001 KB67 371 m  82.27 from 85.68 LD May 28 - 30 radar target
5.56 LD June 10 2018 EJ4 186 m  52.29 from 53.55 LD June 4 - 16 radar/NHATS target
8.96 LD June 11 2015 DP155 162 m  36.72 from 37.47 LD June 6 - 15 NHATS target
* EPU = Earth passage uncertainty

This report was generated at 1942 UTC with follow-up in today's DOU MPEC for departed risk-listed intruder 2018 HW1 and for approaching 1999 FN19.

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 2 May '18

The MPC's NEO Confirmation Page has 6 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had six objects listed. Of these, three were "one nighters." So far The Tracking News has counted a total of seven 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 2 May '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 2 May '18 >>  MPEC 2018-J02 - "12:10 UT" - Daily Orbit Update

Observers  on 2 May '18

Three observers appear in today's MPEC.

CodeObserver / observatory
160Castelmartini Obs. in Italy, 8 in MPEC 2018-J02 -- 2018 BY2, 1999 FN19, 475967, 374851, 337084, 163243, 9856, 8037
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2018-J02 -- 2006 SP198
E08Wobblesock Obs. in New South Wales, 1 in MPEC 2018-J02 -- 2018 HW1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 May '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 HJ2NEODyS0618208512.23e-05-4.45-4.450NEODyS: "Based on 52 optical observations (of which 0 are rejected as outliers) from 2018-04-23.412 to 2018-04-29.292."
2018 HW1JPL Sentry18342118-211833.5157e-07-7.33-7.650JPL: Computed at 07:41 today Pacific time based on 50 observations spanning 5.2795 days (2018-Apr-23.20248 to 2018-Apr-28.48196). Diameter approximately 0.024 km. from weighted mean H=25.77.
NEODyS18342105-211858.71e-08-7.93-8.21n/aNEODyS: "Based on 51 optical observations (of which 1 are rejected as outliers) from 2018-04-23.203 to 2018-04-28.491."
2018 EZ2NEODyS06182055-2118213.92e-05-5.13-5.17-NEODyS: "Based on 88 optical observations (of which 0 are rejected as outliers) from 2018-03-12.422 to 2018-04-18.382."
2014 HD198NEODyS06182025-2112148.18e-07-7.91-8.290NEODyS: "Based on 6 optical observations (of which 0 are rejected as outliers) from 2014-04-25.134 to 2014-04-26.100."

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 2 May '18

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

1942Generated Traffic Report
1834Noted that JPL Sentry has updated its 2018 HW1 risk assessment - see above
Noted that NEODyS has updated its 2018 HW1 risk assessment - see above
Grabbed MPEC 2018-J02 - Daily Orbit Update - see above
0618Noted that NEODyS has updated its 2014 HD198 risk assessment - see above
Noted that NEODyS has updated its 2018 EZ2 risk assessment - see above
Noted that NEODyS has updated its 2018 HJ2 risk assessment - see above