Contents  on 17 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 17 June '17

Two objects reported inside ten LD

There are two asteroidal objects known to be less than ten lunar distances (LD) from Earth today. 2017 LX is outbound from 4.06 to 7.97 LD and 2017 LV is inbound from 7.79 to 6.96 LD. Coming around the Sun next, radar target 441987 2010 NY65 arrives inside ten LD on June 22nd and NHATS target 2017 BS5 on July 16th.

This report was generated at 1820 UTC with follow-up in today's DOU MPEC for 2017 LX, 2017 LV, and for departed objects risk-listed (and dim) 2017 LD, radar targets 2017 CS and 418094 2007 WV4, and for distant 484402 2007 XH16, plus astrometry from two weeks ago for radar target 2017 BQ6 and from last year for NHATS target 2009 DL46.



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 ten-plus years ago but is not currently coming 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 17 June '17

The MPC's NEO Confirmation Page has 10 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had ten objects listed. So far The Tracking News has counted a total of sixteen 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 17 June '17

Minor Planet Electronic Circulars

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


MPEC 2017-M07 - "13:21 UT" - 2011 CT4


<< DOU on 17 June '17 >>  MPEC 2017-M06 - "11:59 UT" - Daily Orbit Update


MPEC 2017-M05 - "01:16 UT" - 2017 MA


MPEC 2017-M04 - "01:12 UT" - 2017 LG1


MPEC 2017-M03 - "01:09 UT" - 2017 LF1


MPEC 2017-M02 - "01:04 UT" - 2017 LE1

Observers  on 17 June '17

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 25 in MPEC 2017-M06 -- 2017 LG, 2017 LC, 2017 KU4, 2017 KS34, 2017 KO34, 2017 KK3, 2017 JW2, 2017 HY50, 2017 HW48, 2017 HQ49, 2017 GQ6, 2017 GQ4, 2017 FW64, 2017 DS35, 2017 DB109, 2017 BQ6, 2012 PG5, 2003 MT, 66391, 494706, 329774, 142040, 141056, 11398, 4596
T08ATLAS Mauna Loa in Hawaii, 3 in MPEC 2017-M06 -- 2017 CS, 2011 ED78, 2010 VB1
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2017-M04 -- 2017 LG1
703Catalina Sky Survey (CSS) in Arizona, 5 in MPEC 2017-M06 -- 2010 VB1, 54789, 4055, 3103, 2329
Z58ESA Test-Bed Telescope Cebreros in Spain, 3 in MPEC 2017-M06 -- 2016 BX14, 2009 DL46, 141354
006Fabra Obs. in Spain, 1 in MPEC 2017-M06 -- 2102
K88GINOP-KHK in Hungary, 1 in MPEC 2017-M04 -- 2017 LG1
J95Great Shefford Obs. in England, 4 in MPECs 2017-M02, 2017-M03, 2017-M04, 2017-M05 & 2017-M06 -- 2017 MA, 2017 LG1, 2017 LF1, 2017 LE1
W08Jimginny Obs., 1 in MPEC 2017-M06 -- 2017 CS
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-M02 -- 2017 LE1
K38M57 Obs. in Italy, 2 in MPEC 2017-M06 -- 2017 MA, 418094
474Mt. John Obs. in New Zealand, 12 in MPECs 2017-M02, 2017-M03, 2017-M05 & 2017-M06 -- 2017 MA, 2017 LW, 2017 LF1, 2017 LE1, 2017 KV34, 2017 KS34, 2017 JL3, 2017 GO7, 2013 RE21, 2013 OM9, 2007 PS9, 2002 CY58
G96Mt. Lemmon Survey (MLS) in Arizona, 26 in MPECs 2017-M02, 2017-M03, 2017-M04, 2017-M05 & 2017-M06 -- 2017 MA, 2017 LG1, 2017 LF1, 2017 LE1, 2017 KE5, 2017 KE3, 2017 DS35, 2017 AC5, 2016 YU8, 2016 YU10, 2015 ME54, 2013 YY13, 2011 ED78, 90373, 494710, 488465, 484402, 331769, 265032, 142781, 136582, 100926, 7888, 6063, 4581, 1917
J69North Obs. in England, 1 in MPEC 2017-M05 -- 2017 MA
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-M05 -- 2017 MA
C23Olmen Obs. in Belgium, 1 in MPEC 2017-M06 -- 190166
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2017-M06 -- 66391
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPECs 2017-M04, 2017-M05 & 2017-M06 -- 2017 MA, 2017 LG1, 2017 HN3, 2017 GQ6, 2012 HN8, 2010 VB1, 329774
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2017-M06 -- 418094, 23183
W25RMS Obs., 1 in MPEC 2017-M06 -- 2017 MA
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2017-M03, 2017-M04 & 2017-M05 -- 2017 MA, 2017 LG1, 2017 LF1
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-M05 -- 2017 MA
Y00SONEAR in Brazil, 1 in MPEC 2017-M06 -- 2008 NU
691Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2017-M05 & 2017-M06 -- 2017 MA, 2017 LG1, 2017 LF1, 2017 FP64, 2017 BL6, 2004 MD6, 437841
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2017-M02 & 2017-M06 -- 2017 LF, 2017 LE1, 2017 KZ4
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2017-M04 & 2017-M05 -- 2017 MA, 2017 LG1
926Tenagra II Obs. in Arizona, 16 in MPECs 2017-M02, 2017-M03, 2017-M04, 2017-M06 & 2017-M07 -- 2017 LX, 2017 LW, 2017 LV, 2017 LG1, 2017 LG, 2017 LF1, 2017 LE1, 2017 LC, 2017 HV4, 2017 FO90, 2011 CT4, 418094, 416584, 138846, 106589, 5879
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2017-M06 -- 2017 LD
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 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.
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 LDNEODyS19182045-21176861.71e-03-4.27-4.860NEODyS: "Based on 92 optical observations (of which 0 are rejected as outliers) from 2017-05-16.299 to 2017-06-16.607."
JPL Sentry18022045-21174270.001800027116-4.22-4.890JPL #2 for the day: Computed at 10:53 today Pacific time based on 92 observations spanning 31.307 days (2017-May-16.298488 to 2017-Jun-16.60593). Diameter approximately 0.010 km. from weighted mean H=27.60.

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 17 June '17

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

1918Noted that NEODyS has updated its 2017 LD risk assessment - see above
1820Generated Traffic Report
1802Noted that JPL Sentry has updated its 2017 LD risk assessment - see above
1606Noted that JPL Sentry has updated its 2017 LD risk assessment - see above
1508Grabbed MPEC 2017-M06 - Daily Orbit Update - see above
Grabbed MPEC 2017-M07 - 2011 CT4 - see above
0228Grabbed MPEC 2017-M02 - 2017 LE1 - see above
Grabbed MPEC 2017-M03 - 2017 LF1 - see above
Grabbed MPEC 2017-M04 - 2017 LG1 - see above
Grabbed MPEC 2017-M05 - 2017 MA - see above