Contents  on 15 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 15 June '17

Two objects reported inside ten LD

There are two asteroids reported passing within ten lunar distances (LD) of Earth today, both of them newly announced. 2017 LX is inbound from 6.58 to 3.13 LD and 2017 LV enters our ten-LD traffic reporting "bubble," moving from 10.97 to 9.20 LD. Next known to be on approach, radar target 441987 2010 NY65 slips inside the bubble on June 22nd and NHATS target 2017 BS5 on July 16th.

This report was generated at 1934 UTC with new discoveries 2017 LX (MPEC) and 2017 LV (MPEC), and with follow-up in today's DOU MPEC for departed radar targets 2017 CS and 418094 2007 WV4 and for distant 484402 2007 XH16, plus astrometry from last year for 2016 GV221 and from 2012 for risk-listed NHATS target 2012 TC4, which will be a radar target when it makes a close approach this October.



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 15 June '17

The MPC's NEO Confirmation Page has 8 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eight objects listed. Of these, two were "one nighters." So far The Tracking News has counted a total of eighteen 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 15 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-L73 - "20:42 UT" - 2016 LB


<< DOU on 15 June '17 >>  MPEC 2017-L72 - "11:59 UT" - Daily Orbit Update


MPEC 2017-L71 - "10:50 UT" - 2017 LX


MPEC 2017-L70 - "10:47 UT" - 2017 LW


MPEC 2017-L69 - "10:44 UT" - 2017 LV


MPEC 2017-L68 - "10:41 UT" - 2017 LU

Observers  on 15 June '17

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 1 in MPEC 2017-L72 -- 2016 GV221
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPECs 2017-L71 & 2017-L72 -- 2017 LX, 2017 HR49, 2017 GQ6, 2017 DS35, 2016 LE51, 2016 JH12, 2007 VR183, 333908, 329774, 142561, 141447, 2102
T08ATLAS Mauna Loa in Hawaii, 9 in MPEC 2017-L72 -- 2017 HW48, 2011 ED78, 68348, 495331, 39796, 163696, 136923, 4341, 1980
160Castelmartini Obs. in Italy, 15 in MPEC 2017-L72 -- 2017 HY50, 2017 CS, 2011 ED78, 68348, 52750, 495331, 494706, 484402, 416584, 190166, 142040, 100926, 7888, 6063, 2102
703Catalina Sky Survey (CSS) in Arizona, 13 in MPEC 2017-L72 -- 2017 KT4, 2017 HY50, 2017 HN3, 2010 VB1, 66391, 494706, 484517, 418094, 242191, 175189, 163696, 143624, 11398
734Farpoint Obs. in Kansas, 2 in MPECs 2017-L69 & 2017-L71 -- 2017 LX, 2017 LV
J95Great Shefford Obs. in England, 2 in MPECs 2017-L69 & 2017-L70 -- 2017 LW, 2017 LV
A17Guidestar Obs. in Germany, 2 in MPECs 2017-L69 & 2017-L71 -- 2017 LX, 2017 LV
H06%Ernesto Guido in Italy via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-L72 -- 2012 TC4
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-L68 -- 2017 LU
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-L68 -- 2017 LU
G96Mt. Lemmon Survey (MLS) in Arizona, 12 in MPECs 2017-L69, 2017-L70, 2017-L71 & 2017-L72 -- 2017 LX, 2017 LW, 2017 LV, 2017 LU, 2007 VR183, 2007 MT20, 2004 KB, 475665, 437841, 24443, 190166, 185716
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2017-L72 -- 2017 CS
Z80Northolt Branch Obs. in England, 2 in MPEC 2017-L72 -- 495331, 6063
C23Olmen Obs. in Belgium, 1 in MPEC 2017-L72 -- 190166
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2017-L70 & 2017-L72 -- 2017 LW, 2017 FD1
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 17 in MPEC 2017-L72 -- 2017 KT4, 2017 KE5, 2017 HY50, 2017 GM7, 2013 CL118, 2013 BR45, 2011 ED78, 66391, 495331, 484517, 484402, 418094, 190166, 163696, 11398, 100926, 6063
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2017-L69 & 2017-L70 -- 2017 LW, 2017 LV
691Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2017-L70 & 2017-L72 -- 2017 LW, 2017 KQ34, 2017 KP4, 2017 KP31, 2017 KN4, 2017 KE3, 2014 UJ192
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2017-L68 & 2017-L72 -- 2017 LU, 2017 HX3, 2013 PX6, 2012 HN13
926Tenagra II Obs. in Arizona, 6 in MPECs 2017-L68, 2017-L69, 2017-L70, 2017-L71, 2017-L72 & 2017-L73 -- 2017 LX, 2017 LW, 2017 LV, 2017 LU, 2017 LC, 2016 LB
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-L72 -- 154590
C51WISE in Earth polar orbit, 1 in MPEC 2017-L68 -- 2017 LU
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 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 LUNEODyS1900205616.05e-06-1.98-1.981NEODyS: "Based on 72 optical observations (of which 2 are rejected as outliers) from 2017-06-08.757 to 2017-06-15.456."
JPL Sentry16172056-209528.6143e-07-2.87-2.880JPL: Computed at 07:47 today Pacific time based on 38 observations spanning 6.6992 days (2017-Jun-08.75606 to 2017-Jun-15.45527). Diameter approximately 0.700 km. from weighted mean H=18.43.

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 15 June '17

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

2137Grabbed MPEC 2017-L73 - 2016 LB - see above
1934Generated Traffic Report
1900Noted that NEODyS has posted 2017 LU as an impact risk - see above
1617Noted that JPL Sentry has posted 2017 LU as an impact risk - see above
1615Grabbed MPEC 2017-L68 - 2017 LU - see above
Grabbed MPEC 2017-L69 - 2017 LV - see above
Grabbed MPEC 2017-L70 - 2017 LW - see above
Grabbed MPEC 2017-L71 - 2017 LX - see above
Grabbed MPEC 2017-L72 - Daily Orbit Update - see above