Contents  on 5 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 5 June '17

Five objects reported inside ten LD

There are five Solar-System small bodies reported within ten lunar distances (LD) of Earth today. Nearest is risk-listed 2017 KQ27, which enters Earth's sphere of gravitational influence (SOI), coming in from 4.02 to 1.81 LD.

Earth passage I D ~Size Distance Today  Notes
1.02 LD tomorrow2017 KQ27 24 m  1.81 from 4.02 LD enters Earth SOI, risk
1.90 LD May 242017 KJ32 6 m  6.62 to 7.16 LD risk
3.00 LD today2017 LD 9 m  3.00 LD risk, Earth closest at 1028 UTC - DOU
5.18 LD June 72017 LE 18 m  5.62 from 6.67 LD DOU
7.00 LD tomorrow2017 KR27 68 m  7.01 from 7.71 LD DOU

This report was generated at 2006 UTC with follow-up in today's DOU MPEC for three objects active in the traffic table here plus departed objects 2017 BQ6 and radar targets 2017 CS and 418094 2007 WV4, along with distant 484402 2007 XH16.

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 5 June '17

The MPC's NEO Confirmation Page has 16 listings

When last checked at 2328 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had sixteen objects listed. Of these, four were "one nighters." So far The Tracking News has counted a total of seventeen 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 5 June '17

Minor Planet Electronic Circulars

As of last check at 2328 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2017-L47 - "15:17 UT" - S/2017 J 1

MPEC 2017-L46 - "15:05 UT" - S/2003 J 15

<< DOU on 5 June '17 >>  MPEC 2017-L45 - "12:02 UT" - Daily Orbit Update

Observers  on 5 June '17

A total of 22 observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 16 in MPEC 2017-L45 -- 2017 KT4, 2017 KS4, 2017 KR4, 2017 KR31, 2017 KO27, 2017 JU1, 2017 HY50, 2017 HW48, 2017 HN3, 2017 GQ6, 2017 DS35, 2016 YU8, 2016 YU10, 2016 JH12, 242191, 222073
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2017-L45 -- 190166
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2017-L45 -- 6063
073Bucharest Obs. in Romania, 1 in MPEC 2017-L45 -- 2017 CS
160Castelmartini Obs. in Italy, 17 in MPEC 2017-L45 -- 2017 HY50, 2011 ED78, 68348, 66391, 484402, 475665, 416584, 190166, 163696, 142561, 142040, 106589, 100926, 7888, 2329, 2102, 1917
703Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2017-L45 -- 484517, 418094, 11398, 3103
Z45Cosmos Obs., 2 in MPEC 2017-L45 -- 190166, 137170
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPEC 2017-L45 -- 2017 BQ6, 2010 MU112
Z43Landehen Obs., 3 in MPEC 2017-L45 -- 2017 CS, 190166, 11398
108Montelupo Obs. in Italy, 2 in MPEC 2017-L45 -- 2017 CS, 1980
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPEC 2017-L45 -- 469727, 456651, 339492, 7336, 5879
0895program code 5 via Nikolaev Obs. in the Ukraine, 1 in MPEC 2017-L45 -- 2017 CS
Z80Northolt Branch Obs. in England, 2 in MPEC 2017-L45 -- 2017 KR27, 418094
Z73Nuevos Horizontes Obs. in Spain, 1 in MPEC 2017-L45 -- 2017 CS
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2017-L45 -- 154144, 142561, 5332
W885M. Kumrucu-Lohmiller in Massachusetts via Chile Obs. in Chile, 1 in MPEC 2017-L45 -- 2017 HW1
691Spacewatch 0.9m telescope in Arizona, 5 in MPEC 2017-L45 -- 2010 LQ33, 2010 EK12, 2009 WO106, 2004 KB, 2004 BW1
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2017-L45 -- 2017 KR31, 2017 KP31, 2017 FP64, 2010 LQ33, 2007 ML24, 437841
926Tenagra II Obs. in Arizona, 10 in MPEC 2017-L45 -- 2017 LG, 2017 LE, 2017 LD, 2017 KR31, 2017 KR27, 2017 KF3, 2017 CS, 2003 MJ4, 418094, 5879
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2017-L45 -- 2017 JF3, 2017 HH, 2016 XO23
K17Valentines Obs., 1 in MPEC 2017-L45 -- 2017 CS
Z92West Park Obs. in England, 1 in MPEC 2017-L45 -- 2017 CS
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 June '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2328 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 LDJPL Sentry17022045-21163130.003287578042-3.87-3.950JPL: Computed at 09:39 today Pacific time based on 68 observations spanning 3.2010 days (2017-Jun-02.20233 to 2017-Jun-05.40331). Diameter approximately 0.009 km. from weighted mean H=27.84.
NEODyS15312045-21174814.7e-03-3.67-4.270NEODyS: "Based on 68 optical observations (of which 0 are rejected as outliers) from 2017-06-02.203 to 2017-06-05.404."

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 5 June '17

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

2006Generated Traffic Report
1702Noted that JPL Sentry has updated its 2017 LD risk assessment - see above
1531Noted that NEODyS has updated its 2017 LD risk assessment - see above
Grabbed MPEC 2017-L45 - Daily Orbit Update - see above
Grabbed MPEC 2017-L46 - S/2003 J 15 - see above
Grabbed MPEC 2017-L47 - S/2017 J 1 - see above