Contents  on 15 May '17

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 May '17

Five objects reported inside ten LD

Five asteroidal objects are known to be less than ten lunar distances (LD) from Earth today. Nearest of these are 2017 JM2, which comes its closest to our planet this time around -- 5.09 LD at 0348 UTC, and 2017 HU49, outbound from from 5.70 to 5.80 LD.

Earth passage I D ~Size Distance Today  Notes
0.14 LD May 42017 JB2 5 m  7.45 to 8.11 LD intruder, risk
2.57 LD May 122017 JA2 38 m  5.94 to 7.94 LD
3.71 LD May 112017 JX1 21 m  7.89 to 9.51 LD
5.09 LD today2017 JM2 46 m  5.09 LD Earth closest at 0348 UTC - DOU
5.55 LD May 112017 HU49 18 m  5.70 to 5.80 LD DOU
7.93 LD May 292017 CS 446 m  < 10 LD May 26, radar target - DOU

This report was generated at 1744 UTC with follow-up in today's DOU MPEC for three objects in the active traffic table here, and for departed radar target 2014 JO25.

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 15 May '17

The MPC's NEO Confirmation Page has 25 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 25 objects listed. Of these, ten were "one nighters." So far The Tracking News has counted a total of 26 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 May '17

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 15 May '17 >>  MPEC 2017-J75 - "12:04 UT" - Daily Orbit Update

Observers  on 15 May '17

Twelve observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPEC 2017-J75 -- 2017 JS1, 2017 HZ4, 2017 HV3, 2017 HA49, 2017 HA1, 2017 GQ5, 2017 FK128, 2017 DB109, 2016 YF11, 2010 JT34, 2000 UG11, 222073, 11398
T05ATLAS Haleakala in Hawaii, 5 in MPEC 2017-J75 -- 2014 KF91, 480934, 138404, 7341, 4503
T08ATLAS Mauna Loa in Hawaii, 8 in MPEC 2017-J75 -- 456651, 252091, 222073, 163696, 154144, 11398, 4055, 2329
703Catalina Sky Survey (CSS) in Arizona, 5 in MPEC 2017-J75 -- 2014 JO25, 2008 YA, 162463, 152931, 11398
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-J75 -- 222073
W92MASTER OAFA Obs., 1 in MPEC 2017-J75 -- 427643
G96Mt. Lemmon Survey (MLS) in Arizona, 18 in MPEC 2017-J75 -- 2017 JW1, 2017 HN3, 488490, 488474, 488465, 474425, 468909, 409256, 331769, 222073, 190166, 162452, 159560, 138359, 136897, 4015, 2061, 1917
Z80Northolt Branch Obs. in England, 3 in MPEC 2017-J75 -- 190166, 11398, 2329
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 9 in MPEC 2017-J75 -- 2017 JM2, 2017 CS, 2016 JP, 2014 JO25, 2013 CL118, 2008 YA, 163696, 11398, 2329
G40'program code "'" (16) via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-J75 -- 106589
926Tenagra II Obs. in Arizona, 2 in MPEC 2017-J75 -- 2017 JM2, 2017 HU49
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-J75 -- 2017 FO128
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 May '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 HZ4JPL Sentry15302082-2113187.3057524e-05-4.95-5.010JPL: Computed at 08:13 today Pacific time based on 38 observations spanning 17.671 days (2017-Apr-26.44436 to 2017-May-14.115658). Diameter approximately 0.022 km. from weighted mean H=25.97.

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 May '17

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

1744Generated Traffic Report
1530Noted that JPL Sentry has updated its 2017 HZ4 risk assessment - see above
Grabbed MPEC 2017-J75 - Daily Orbit Update - see above