Contents  on 20 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 20 June '17

Two objects reported inside ten LD

There are two minor objects reported within ten lunar distances (LD) of our planet today. Still within Earth's sphere of gravitational influence (SOI), 2017 MF comes its closest to the Moon on this passage, reaching 1.21 LD at 1232 UTC. And, much further away, 2017 LV heads out from 7.65 to 9.00 LD. Coming into the neighborhood next, radar target 441987 2010 NY65 enters ten LD on June 22nd and NHATS target 2017 BS5 on July 16th.

This report was generated at 1846 UTC with follow-up in today's DOU MPEC for 2017 MF and for departed radar targets 2017 CS and 418094 2007 WV4 plus distant 484402 2007 XH16, plus astrometry from early this month for risk-listed radar target 2017 KQ27

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.

Radar Astrometry  on 20 June '17

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data update noted at 2102 UTC when the database was dated 20 June

NEOCP Activity  on 20 June '17

The MPC's NEO Confirmation Page has 22 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 22 objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of 23 listings on the NEOCP today.

New MPECs  on 20 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-M31 - "23:55 UT" - 2011 HJ103

MPEC 2017-M30 - "15:48 UT" - 2014 BR8

<< DOU on 20 June '17 >>  MPEC 2017-M29 - "12:00 UT" - Daily Orbit Update

MPEC 2017-M28 - "11:51 UT" - Comet P/2009 S2 = 2017 M1 (McNaught)

Observers  on 20 June '17

A total of 28 observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2017 FZ2
H21Astronomical Research Obs. Westfield in Illinois, 30 in MPEC 2017-M29 -- 2017 LW, 2017 LF, 2017 LC, 2017 LA, 2017 KE3, 2017 KD5, 2017 JW2, 2017 HV3, 2017 HN3, 2017 GQ6, 2017 GQ4, 2017 FH90, 2017 DS35, 2017 DB109, 2017 CS, 2016 YU8, 2014 LU14, 2009 ME9, 2006 WT29, 66391, 494706, 190166, 142561, 142040, 139047, 11398, 106589, 7888, 6063, 1980
T05ATLAS Haleakala in Hawaii, 2 in MPEC 2017-M29 -- 163696, 4954
T08ATLAS Mauna Loa in Hawaii, 8 in MPEC 2017-M29 -- 2008 NU, 484517, 484402, 483560, 190166, 138846, 2329, 1917
160Castelmartini Obs. in Italy, 9 in MPEC 2017-M29 -- 2017 MF, 2011 ED78, 2010 VB1, 495331, 494706, 190166, 163696, 100926, 6063
703Catalina Sky Survey in Arizona, 1 in MPEC 2017-M29 -- 2016 AA9
309&Marco Micheli via Cerro Paranal in Chile, 1 in MPEC 2017-M29 -- 2017 HZ4
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPECs 2017-M29 & 2017-M30 -- 2017 KR4, 2017 KR34, 2017 KQ27, 2017 KD3, 2017 HH, 2017 GU6, 2017 FT2, 2017 EC, 2014 BR8
Z39Costa Teguise Obs. in the Canary Islands, 1 in MPEC 2017-M29 -- 6063
734Farpoint Obs. in Kansas, 1 in MPEC 2017-M29 -- 2017 LW
J95Great Shefford Obs. in England, 1 in MPEC 2017-M29 -- 2017 MF
A17Guidestar Obs. in Germany, 3 in MPEC 2017-M29 -- 2017 DS35, 2009 WC52, 2008 KD6
G48Harlingten Research Obs. in New Mexico, 1 in MPEC 2017-M29 -- 2011 ED78
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-M29 -- 138846
Z43Landehen Obs., 4 in MPEC 2017-M29 -- 66391, 190166, 11398, 2102
699LONEOS in Arizona, 1 in MPEC 2017-M29 -- 2016 AA9
Z22MASTER IAC Obs. in the Canary Islands, 2 in MPEC 2017-M29 -- 5751, 3288
W92MASTER OAFA Obs., 1 in MPEC 2017-M29 -- 2008 NU
474Mt. John Obs. in New Zealand, 5 in MPEC 2017-M29 -- 2017 MF, 2017 KV31, 2017 FX64, 2016 WZ1, 2015 KJ57
2664program code 4 via New Horizons KBO Search, Subaru Telescope in Hawaii, 1 in MPEC 2017-M31 -- 2011 HJ103
C23Olmen Obs. in Belgium, 1 in MPEC 2017-M29 -- 190166
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 16 in MPEC 2017-M29 -- 2017 MA, 2017 KT4, 2017 KE5, 2017 HY50, 2017 GM7, 2013 BR45, 2011 ED78, 2010 VB1, 66391, 494706, 484517, 418094, 190166, 163696, 11398, 2329
C95SATINO-1 in France, 1 in MPEC 2017-M29 -- 2017 MF
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2017-M29 -- 2017 LO1, 2017 HV3, 2017 HS, 2016 NG33, 2016 AA9, 2010 LM14
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-M29 -- 2015 YR1
461SZTE Asteroid Program in Hungary, 1 in MPEC 2017-M28 -- P/2017 M1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2017-M29 -- 2017 FO90, 2017 AX3, 2017 AQ19
C51WISE in Earth polar orbit, 1 in MPEC 2017-M29 -- 332408
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 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 LO1JPL Sentry1615R E M O V E DJPL: Risk listing removed at 1504 UTC today.
2017 KQ27JPL Sentry16152117-211714.739e-07-7.04-7.040JPL: Computed at 07:51 today Pacific time based on 63 observations spanning 10.868 days (2017-May-25.30459 to 2017-Jun-05.17255). Diameter approximately 0.023 km. from weighted mean H=25.82.
2017 HZ4JPL Sentry16152091-210651.5846369e-05-5.56-5.580JPL: Computed at 08:06 today Pacific time based on 49 observations spanning 53.553 days (2017-Apr-26.44436 to 2017-Jun-18.997168). Diameter approximately 0.023 km. from weighted mean H=25.86.
2017 FZ2JPL Sentry2132R E M O V E DJPL: Risk listing removed at 2105 UTC today.

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 20 June '17

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

2358Grabbed MPEC 2017-M31 - 2011 HJ103 - see above
2132Noted that JPL Sentry has removed 2017 FZ2 as an impact risk - see above
2102Noted Radar Astrometry database update - see above
1846Generated Traffic Report
1615Noted that JPL Sentry has updated its 2017 HZ4 risk assessment - see above
Noted that JPL Sentry has updated its 2017 KQ27 risk assessment - see above
Noted that JPL Sentry has removed 2017 LO1 as an impact risk - see above
Grabbed MPEC 2017-M28 - Comet P/2009 S2 = 2017 M1 (McNaught) - see above
Grabbed MPEC 2017-M29 - Daily Orbit Update - see above
Grabbed MPEC 2017-M30 - 2014 BR8 - see above