Contents  on 26 June '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 26 June '17

Four objects reported inside ten LD

Four transient natural objects are reported less than ten lunar distances (LD) from Earth today. Closest is 2017 MA3, which is inbound from 4.23 to 3.29 LD.

Earth passage I D ~Size Distance Today  Notes
1.02 LD June 192017 MF 16 m  8.69 to 10.09 LD exits ten LD
3.23 LD tomorrow2017 MA3 15 m  3.29 from 4.23 LD DOU
4.99 LD June 302017 MB3 33 m  7.31 from 8.43 LD DOU
7.89 LD June 24441987 2010 NY65 170 m  9.29 to 11.06 LD exits ten LD, radar target - DOU
2.52 LD June 302017 MC1 42 m  < 10 LD tomorrow
3.12 LD July 232017 BS5 51 m  < 10 LD July 16, NHATS target
6.51 LD July 22017 MC3 51 m  < 10 LD June 30 - DOU

This report was generated at 1827 UTC with the discovery of already departed 2017 MF3 (MPEC), which passed our planet at 6.06 LD on June 15th, and with the optical recovery of departing radar target 441987 2010 NY65 in today's DOU MPEC, along with follow-up for three other objects active here in our traffic table plus departed 2017 MD and astrometry for distant 484402 2007 XH16 from a couple weeks ago.

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 currently is not 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 26 June '17

The MPC's NEO Confirmation Page has 93 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 93 objects listed. Of these, 27 were "one nighters." So far The Tracking News has counted a total of 99 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 26 June '17

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2017-M72 - "13:05 UT" - 2017 MG3

MPEC 2017-M71 - "13:01 UT" - 2017 MF3

<< DOU on 26 June '17 >>  MPEC 2017-M70 - "11:59 UT" - Daily Orbit Update

MPEC 2017-M69 - "10:49 UT" - 2014 QL390

Observers  on 26 June '17

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 1 in MPEC 2017-M70 -- 2017 FO90
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-M72 -- 2017 MG3
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPECs 2017-M70 & 2017-M72 -- 2017 MG3, 2017 ME3, 2017 MC3, 2017 MA3
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2017-M70 -- 2010 VB1
K88GINOP-KHK in Hungary, 1 in MPEC 2017-M72 -- 2017 MG3
K95MASTER-II Sutherland in South Africa, 2 in MPEC 2017-M70 -- 5751, 1980
568_Marco Micheli on Mauna Kea in Hawaii, 3 in MPECs 2017-M70, 2017-M71 & 2017-M72 -- 2017 MG3, 2017 MF3, 2017 ME3
474Mt. John Obs. in New Zealand, 1 in MPEC 2017-M71 -- 2017 MF3
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPEC 2017-M70 -- 2017 MK, 2017 ME3, 2017 MB3, 2017 DS35, 2016 YU8, 2014 QL390, 66391, 437841, 271480, 6063
A13Naef Obs. in Switzerland, 1 in MPEC 2017-M70 -- 332408
J69North Obs. in England, 1 in MPEC 2017-M70 -- 441987
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2017-M70 -- 66391
F51Pan-STARRS 1 (PS1) in Hawaii, 19 in MPECs 2017-M69, 2017-M70 & 2017-M72 -- 2017 MV2, 2017 MG3, 2017 ME1, 2017 MD3, 2017 HN3, 2015 OX78, 2014 QL390, 2008 LQ16, 2007 ML6, 2004 TQ13, 494975, 464639, 415715, 410622, 27002, 265962, 159467, 5751, 5731
W25RMS Obs., 1 in MPEC 2017-M72 -- 2017 MG3
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2017-M72 -- 2017 MG3
204Schiaparelli Obs. in Italy, 2 in MPEC 2017-M70 -- 491567, 484402
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2017-M70 & 2017-M72 -- 2017 MG3, 2017 LU
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-M70 -- 441987
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2017-M72 -- 2017 MG3
I52Steward Obs. Mt. Lemmon Station in Arizona, 7 in MPECs 2017-M69, 2017-M70 & 2017-M72 -- 2017 MG3, 2017 MD, 2017 LP1, 2017 LF1, 2017 JU1, 2014 QL390, 68347
I15Wishing Star Obs. in Rhode Island, 4 in MPEC 2017-M70 -- 2017 MA, 441987, 190166, 11398
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 June '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 LUJPL Sentry1603R E M O V E DJPL: Risk listing removed at 1547 UTC today.
NEODyS1603R E M O V E D-

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 26 June '17

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

1827Generated Traffic Report
1603Noted that JPL Sentry has removed 2017 LU as an impact risk - see above
Noted that NEODyS has removed 2017 LU as an impact risk - see above
1500Grabbed MPEC 2017-M69 - 2014 QL390 - see above
Grabbed MPEC 2017-M70 - Daily Orbit Update - see above
Grabbed MPEC 2017-M71 - 2017 MF3 - see above
Grabbed MPEC 2017-M72 - 2017 MG3 - see above