Contents  on 4 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 4 May '17

Four objects reported inside ten LD

Today there are four asteroids known to be inside ten lunar distances (LD) of Earth. Closest are intruder 2017 JA, which moves outward from 6.02 to 9.57 LD, and 2017 HU49, inbound from 6.45 to 6.25 LD.

Earth passage I D ~Size Distance Today  Notes
0.26 LD May 22017 JA 6 m  6.02 to 9.57 LD intruder
0.61 LD April 222017 HG4 10 m  9.61 to 10.41 LD exits ten LD, intruder, risk
5.55 LD May 112017 HU49 19 m  6.25 from 6.45 LD
6.13 LD April 302017 HU3 30 m  9.93 to 11.58 LD exits ten LD
3.70 LD May 82017 HX4 19 m  < 10 LD tomorrow
7.93 LD May 292017 CS 446 m  < 10 LD May 26, radar target - DOU

This report was generated at 1842 UTC with first follow-up for departed risk-listed 2017 GG8 (adding 27.05 days added to its 0.91-day discovery arc) in today's DOU MPEC, along with follow-up for radar targets 2017 CS (approaching) and 2014 JO25 (departed), and for distant 357439 2004 BL86.

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. "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 presently so close. 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 4 May '17

The MPC's NEO Confirmation Page has 43 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 43 objects listed. Of these, nineteen were "one nighters." So far The Tracking News has counted a total of 49 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 4 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 4 May '17 >>  MPEC 2017-J36 - "11:59 UT" - Daily Orbit Update

Observers  on 4 May '17

Twelve observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPEC 2017-J36 -- 2017 HZ49, 2017 HY49, 2017 HS49, 2017 HS3, 2017 HM49, 2017 FR64, 2017 EN, 2017 CK1, 1996 VB3, 302800, 277473, 24443
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2017-J36 -- 2017 CS, 190166, 1917
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2017-J36 -- 2017 HR49, 2017 FM63
G96Mt. Lemmon Survey (MLS) in Arizona, 23 in MPEC 2017-J36 -- 2017 HY4, 2017 HK1, 2017 HE4, 2017 GT5, 2017 GS4, 2017 FD65, 2017 DT37, 2017 AC5, 2015 KN120, 2011 ED78, 85275, 474425, 474231, 456651, 39796, 357439, 343158, 16912, 163696, 154144, 136582, 7480, 2329
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2017-J36 -- 2017 GG8
G403Tony Evans in Portugal via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-J36 -- 1996 VB3
691Spacewatch 0.9m telescope in Arizona, 9 in MPEC 2017-J36 -- 2017 HR49, 2017 HD49, 2017 DC109, 2014 JO25, 2013 RF36, 2011 KR12, 2004 VS60, 2000 AF205, 190758
291Spacewatch 1.8m telescope in Arizona, 8 in MPEC 2017-J36 -- 2017 HZ48, 2017 HY48, 2017 HC49, 2017 FQ101, 2017 EW2, 2016 UW80, 2016 SD, 2016 EU85
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-J36 -- 483560
I52Steward Obs. Mt. Lemmon Station in Arizona, 6 in MPEC 2017-J36 -- 2017 HX49, 2017 HA1, 2017 ER22, 2014 JG78, 2008 KP, 468909
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2017-J36 -- 2017 GG8
C51WISE in Earth polar orbit, 2 in MPEC 2017-J36 -- 484517, 141670
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 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 GG8JPL Sentry16002066-207842.401431e-05-5.15-5.190JPL: Computed at 07:51 today Pacific time based on 11 observations spanning 27.957 days (2017-Apr-01.5574 to 2017-Apr-29.514766). Diameter approximately 0.021 km. from weighted mean H=26.09.

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 4 May '17

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

1842Generated Traffic Report
1600Noted that JPL Sentry has updated its 2017 GG8 risk assessment - see above
Grabbed MPEC 2017-J36 - Daily Orbit Update - see above