Contents  on 24 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 24 June '17

Two objects reported inside ten LD

There are two minor planets reported inside ten lunar distances (LD) of Earth today. 2017 MF is outbound from 5.88 to 7.28 LD and radar target 441987 2010 NY65 comes its closest to Earth this time around -- 7.89 LD at 0637 UTC. Up next, 2017 MC1 comes into our ten-LD traffic reporting space on June 27th and NHATS target 2017 BS5 enters on July 16th.

This report was generated at 1547 UTC with follow-up in today's DOU MPEC for departed radar targets 2017 CS and 418094 2007 WV4. The latter also had radar observations posted late yesterday. Speaking of yesterday, we didn't mention the recovery of risk-listed dim and distant 2015 YC1 (MPEC).

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 so close presently. 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 24 June '17

The MPC's NEO Confirmation Page has 88 listings

When last checked at 2344 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 88 objects listed. Of these, 39 were "one nighters." So far The Tracking News has counted a total of 90 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 24 June '17

Minor Planet Electronic Circulars

As of last check at 2346 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2017-M54 - "23:10 UT" - 2014 SS1

<< DOU on 24 June '17 >>  MPEC 2017-M53 - "12:00 UT" - Daily Orbit Update

Observers  on 24 June '17

Eighteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 23 in MPEC 2017-M53 -- 2017 LW, 2017 LC, 2017 HY50, 2017 HW48, 2017 HN3, 2017 HA1, 2017 GQ6, 2017 CS, 2011 ED78, 68348, 66391, 495331, 494706, 190166, 163696, 142561, 142040, 100926, 7888, 6063, 2102, 1980, 1917
T05ATLAS Haleakala in Hawaii, 2 in MPEC 2017-M53 -- 66391, 11398
T08ATLAS Mauna Loa in Hawaii, 3 in MPEC 2017-M53 -- 2017 MB1, 2017 MA, 2011 ED78
160Castelmartini Obs. in Italy, 6 in MPEC 2017-M53 -- 68348, 52750, 495331, 190166, 142040, 2102
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2017-M53 -- 2017 MA, 2017 KR34, 418094, 333908, 11398, 1980
D08Ghezz Obs. in Switzerland, 1 in MPEC 2017-M53 -- 66391
A17Guidestar Obs. in Germany, 3 in MPEC 2017-M53 -- 2017 MZ, 2017 MC, 142561
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-M53 -- 138846
Z43Landehen Obs., 3 in MPEC 2017-M53 -- 190166, 11398, 2102
W92MASTER OAFA Obs., 1 in MPEC 2017-M53 -- 143992
474Mt. John Obs. in New Zealand, 2 in MPEC 2017-M53 -- 2017 MK, 2017 MA
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPEC 2017-M53 -- 2017 AC5, 495323, 154144, 100926, 1917
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-M53 -- 190166
F51Pan-STARRS 1 (PS1) in Hawaii, 18 in MPEC 2017-M53 -- 2017 MB, 2014 SR339, 2013 MD6, 2013 CL118, 2011 CQ4, 2010 DN1, 2003 MJ4, 68348, 495331, 457768, 454177, 444627, 381564, 369264, 275976, 220124, 139047, 5869
W98Polonia Obs. in Chile, 1 in MPEC 2017-M53 -- 6053
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2017-M53 -- 2017 LU, 162183
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPECs 2017-M53 & 2017-M54 -- 2014 SS1, 2000 HB24
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2017-M54 -- 2014 SS1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 June '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2342 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 MD1NEODyS15002064-2110118.04e-08-7.05-7.380NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2017-06-20.371 to 2017-06-23.267."
2017 MB1JPL Sentry15302048-2117736.706862e-07-2.96-3.440JPL: Computed at 08:01 today Pacific time based on 77 observations spanning 4.2589 days (2017-Jun-19.31418 to 2017-Jun-23.57304). Diameter approximately 0.638 km. from weighted mean H=18.62.
NEODyS15002078-2117412.13e-07-3.47-3.90NEODyS: "Based on 73 optical observations (of which 0 are rejected as outliers) from 2017-06-19.315 to 2017-06-23.373."
2017 LUJPL Sentry15002056-205612.900e-09-5.38-5.380JPL: Computed at 07:46 today Pacific time based on 54 observations spanning 15.673 days (2017-Jun-08.75606 to 2017-Jun-24.42929). Diameter approximately 0.660 km. from weighted mean H=18.54.

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 24 June '17

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

2323Grabbed MPEC 2017-M54 - 2014 SS1 - see above
1547Generated Traffic Report
1530Noted that JPL Sentry has updated its 2017 MB1 risk assessment - see above
1500Noted that JPL Sentry has updated its 2017 LU risk assessment - see above
Noted that NEODyS has posted 2017 MB1 as an impact risk - see above
Noted that NEODyS has posted 2017 MD1 as an impact risk - see above
Grabbed MPEC 2017-M53 - Daily Orbit Update - see above