Contents  on 27 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 27 June '17

Three objects reported inside ten LD

There are three visitors reported inside ten lunar distances (LD) of our home world today. Nearest is 2017 MA3, which comes its closest to Earth this time around, reaching 3.23 LD at 0736 UTC.

Earth passage I D ~Size Distance Today  Notes
2.52 LD June 302017 MC1 42 m  7.95 from 10.46 LD enters ten LD - DOU
3.23 LD today2017 MA3 15 m  3.23 LD Earth closest at 0736 UTC
4.99 LD June 302017 MB3 33 m  6.33 from 7.31 LD DOU
Approaching
3.12 LD July 232017 BS5 51 m  < 10 LD July 16, NHATS target - DOU
6.51 LD July 22017 MC3 51 m  < 10 LD June 30 - DOU

This report was generated at 1942 UTC with follow-up in today's DOU MPEC for four objects in the accompanying active traffic table plus departed objects 2017 MZ2 and radar targets 2017 CS, 418094 2007 WV4, and 441987 2010 NY65, as well as 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 now 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 27 June '17

The MPC's NEO Confirmation Page has 87 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 87 objects listed. Of these, 26 were "one nighters." So far The Tracking News has counted a total of 103 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 27 June '17

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 27 June '17 >>  MPEC 2017-M73 - "12:00 UT" - Daily Orbit Update

Observers  on 27 June '17

Eighteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2017-M73 -- 2017 KL3, 2017 HV3, 2017 FU158, 2017 BS5, 2013 PX6, 368565, 162581
T05ATLAS Haleakala in Hawaii, 2 in MPEC 2017-M73 -- 2017 MC, 416584
T08ATLAS Mauna Loa in Hawaii, 10 in MPEC 2017-M73 -- 2013 LB1, 2008 NU, 2008 MH1, 2003 MJ4, 88254, 154589, 138846, 136923, 4957, 4341
160Castelmartini Obs. in Italy, 10 in MPEC 2017-M73 -- 2017 MA, 2017 CS, 2011 ED78, 52750, 495331, 416584, 190166, 142040, 100926, 6063
703Catalina Sky Survey (CSS) in Arizona, 22 in MPEC 2017-M73 -- 2017 MB1, 2014 YC15, 2014 SZ303, 2008 MH1, 2007 ML6, 96631, 66391, 54789, 441987, 441825, 385580, 332408, 265962, 222073, 20460, 162186, 154144, 143624, 142464, 142040, 5751, 3103
246KLENOT in the Czech Republic, 2 in MPEC 2017-M73 -- 2017 MJ, 2007 MT20
K95MASTER-II Sutherland in South Africa, 3 in MPEC 2017-M73 -- 66146, 8567, 1980
118Modra Obs. in Slovakia, 2 in MPEC 2017-M73 -- 2017 CS, 2329
G96Mt. Lemmon Survey (MLS) in Arizona, 16 in MPEC 2017-M73 -- 2017 MM, 2017 MG3, 2017 MB1, 2015 ME54, 2007 MT20, 2004 BW1, 488494, 484757, 484402, 438452, 418416, 341816, 275677, 20460, 141874, 7888
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-M73 -- 441987
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPEC 2017-M73 -- 2001 EC, 418094, 333908, 251346, 11398
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 6 in MPEC 2017-M73 -- 2017 MB3, 2017 MA, 2017 HW48, 2011 ED78, 2007 MT20, 2102
W98Polonia Obs. in Chile, 1 in MPEC 2017-M73 -- 143992
W25RMS Obs., 8 in MPEC 2017-M73 -- 2017 MK, 2017 MC1, 2017 LW, 2017 KT4, 2017 KR34, 142561, 142040, 138846
K14Sencelles Obs. in Spain, 1 in MPEC 2017-M73 -- 2017 MC
291Spacewatch 1.8m telescope in Arizona, 5 in MPEC 2017-M73 -- 2017 MC3, 2017 MC1, 2017 MB3, 2017 MB1, 162183
I52Steward Obs. Mt. Lemmon Station in Arizona, 4 in MPEC 2017-M73 -- 2017 MZ2, 2017 MF1, 2017 MA1, 2001 EC
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2017-M73 -- 66391, 441987, 11398
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 June '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2359 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2017 MB1JPL Sentry15002073-211781.122414e-07-3.72-3.970JPL: Computed at 07:52 today Pacific time based on 87 observations spanning 8.1519 days (2017-Jun-19.31418 to 2017-Jun-27.46604). Diameter approximately 0.637 km. from weighted mean H=18.62.

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 27 June '17

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

1942Generated Traffic Report
1500Noted that JPL Sentry has updated its 2017 MB1 risk assessment - see above
1400Grabbed MPEC 2017-M73 - Daily Orbit Update - see above