Contents  on 3 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 3 June '17

Six objects reported inside ten LD

Today there are six minor planets reported moving within ten lunar distances (LD) of Earth. Nearest is newly announced 2017 LD, inbound from 3.97 to 3.37 LD.

Earth passage I D ~Size Distance Today  Notes
1.02 LD June 62017 KQ27 24 m  6.36 from 8.72 LD risk - DOU
1.23 LD May 312017 KW31 17 m  6.66 to 9.05 LD Moon buzzer - DOU
1.90 LD May 242017 KJ32 6 m  5.57 to 6.09 LD risk
2.99 LD June 52017 LD 9 m  3.37 from 3.97 LD NEW - MPEC
5.19 LD June 72017 LE 20 m  8.10 from 9.74 LD NEW - MPEC
6.99 LD June 62017 KR27 66 m  9.24 from 11.29 LD enters ten LD - DOU

This report was generated at 2028 UTC with new discoveries 2017 LE (MPEC) and risk-listed 2017 LD (MPEC), and with follow-up in today's DOU MPEC for three objects active in the traffic table here plus five departed objects: 2017 KK32, 2017 KT31, 2017 KN27, and radar targets 2017 CS and 418094 2007 WV4.



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. 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 3 June '17

The MPC's NEO Confirmation Page has 14 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fourteen objects listed. Of these, two were "one nighters." So far The Tracking News has counted a total of 22 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 3 June '17

Minor Planet Electronic Circulars

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


MPEC 2017-L26 - "14:48 UT" - 2017 LE


MPEC 2017-L25 - "14:45 UT" - 2017 LD


MPEC 2017-L24 - "14:42 UT" - 2017 LC


MPEC 2017-L23 - "14:38 UT" - 2017 KY34


<< DOU on 3 June '17 >>  MPEC 2017-L22 - "12:02 UT" - Daily Orbit Update

Observers  on 3 June '17

A total of 29 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 29 in MPEC 2017-L22 -- 2017 KZ4, 2017 KV31, 2017 KT31, 2017 KS4, 2017 KR4, 2017 KR31, 2017 KP4, 2017 KO27, 2017 KN4, 2017 KN27, 2017 KL3, 2017 KL27, 2017 KK3, 2017 KK27, 2017 KF3, 2017 KE5, 2017 KE3, 2017 KD5, 2017 KA5, 2017 JL3, 2017 AQ19, 2016 JH12, 2014 OE338, 2013 LX28, 2011 KE3, 2011 JZ10, 2006 HW50, 2005 OU2, 2002 QD7
H21Astronomical Research Obs. Westfield in Illinois, 19 in MPECs 2017-L22 & 2017-L24 -- 2017 LC, 2017 KW31, 2017 KT4, 2017 KR4, 2017 KR27, 2017 KN27, 2017 KF5, 2017 JU1, 2017 JL2, 2017 HV3, 2017 GT5, 2017 GS5, 2017 GQ6, 2017 FP64, 2017 FJ90, 2014 YS34, 2010 JU39, 2005 OU2, 4596
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2017-L22 -- 66391
T08ATLAS Mauna Loa in Hawaii, 7 in MPEC 2017-L22 -- 2014 KF91, 2005 GL9, 136923, 100926, 6050, 1980, 1917
B66Casasco Obs. in Italy, 3 in MPEC 2017-L22 -- 2005 GL9, 418094, 190166
160Castelmartini Obs. in Italy, 17 in MPEC 2017-L22 -- 2017 KR27, 2017 CS, 2011 ED78, 2005 GL9, 68950, 68348, 475665, 416584, 222073, 190166, 142561, 141056, 106589, 100926, 7888, 6063, 2102
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2017-L22 & 2017-L25 -- 2017 LD, 470310, 142464, 3752
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPECs 2017-L22 & 2017-L23 -- 2017 KY34, 2017 KV4, 2017 KQ27, 2017 KO4, 2017 KN4, 2017 KD3, 2017 FO2, 2017 EC
Z45Cosmos Obs., 1 in MPEC 2017-L22 -- 2017 CS
203GiaGa Obs. in Italy, 1 in MPEC 2017-L22 -- 2017 KR27
K88GINOP-KHK in Hungary, 2 in MPECs 2017-L25 & 2017-L26 -- 2017 LE, 2017 LD
168Kourovskaya Obs. in Russia, 4 in MPEC 2017-L22 -- 474179, 427643, 260141, 8176
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2017-L22 -- 2017 KQ27
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-L23 -- 2017 KY34
W92MASTER OAFA Obs., 1 in MPEC 2017-L22 -- 1980
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-L22 -- 1036
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2017-L22 & 2017-L26 -- 2017 LE, 2017 DS35, 185716
0895program code 5 via Nikolaev Obs. in the Ukraine, 1 in MPEC 2017-L22 -- 137170
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-L22 -- 418094
C23Olmen Obs. in Belgium, 1 in MPEC 2017-L22 -- 66391
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPECs 2017-L22, 2017-L23 & 2017-L24 -- 2017 LC, 2017 KY34, 2017 GQ6, 2012 VO76, 2011 HJ61, 68950, 369264, 251346, 163335
W25RMS Obs., 10 in MPECs 2017-L22 & 2017-L25 -- 2017 LD, 2017 KS4, 2017 KR27, 2017 KQ27, 2017 KF3, 2017 JU1, 66253, 276468, 142561, 106589
204Schiaparelli Obs. in Italy, 4 in MPEC 2017-L22 -- 2017 HW48, 2015 ME54, 2013 CL118, 2011 ED78
587Sormano Obs. in Italy, 1 in MPEC 2017-L25 -- 2017 LD
691Spacewatch 0.9m telescope in Arizona, 7 in MPEC 2017-L22 -- 2017 KE5, 2017 KE3, 2017 HY50, 2016 WO1, 2009 WO106, 2007 LC15, 2004 KB
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2017-L22 & 2017-L24 -- 2017 LC, 2017 KZ4, 2017 KP4, 2017 KL3, 2017 KK3, 2014 JG78, 2004 JQ1
I52Steward Obs. Mt. Lemmon Station in Arizona, 5 in MPECs 2017-L22, 2017-L23, 2017-L24, 2017-L25 & 2017-L26 -- 2017 LE, 2017 LD, 2017 LC, 2017 KY34, 2017 JF3
926Tenagra II Obs. in Arizona, 9 in MPECs 2017-L22, 2017-L24, 2017-L25 & 2017-L26 -- 2017 LE, 2017 LD, 2017 LC, 2017 KR4, 2017 KR27, 2017 KQ27, 2017 KK32, 2017 HY50, 418094
C51WISE in Earth polar orbit, 2 in MPEC 2017-L22 -- 448003, 175189
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 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 LDJPL Sentry18002040-21164030.0028484770682-3.98-4.180JPL: Computed at 10:42 today Pacific time based on 43 observations spanning 1.1969 days (2017-Jun-02.20233 to 2017-Jun-03.39925). Diameter approximately 0.009 km. from weighted mean H=27.79.
2017 LCNEODyS2200210411.34e-08-6.95-6.950NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2017-05-30.334 to 2017-06-03.415."
2017 KJ32NEODyS15502083-211071.51e-07-9.07-9.450NEODyS: "Based on 38 optical observations (of which 0 are rejected as outliers) from 2017-05-29.279 to 2017-06-02.361."
2017 KQ27NEODyS22002080-211733.95e-06-6.10-6.110NEODyS #2 for the day: "Based on 45 optical observations (of which 1 are rejected as outliers) from 2017-05-25.305 to 2017-06-02.194."

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 3 June '17

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

2200Noted that NEODyS has updated its 2017 KQ27 risk assessment - see above
Noted that NEODyS has posted 2017 LC as an impact risk - see above
2028Generated Traffic Report
1800Noted that JPL Sentry has posted 2017 LD as an impact risk - see above
1550Noted that NEODyS has updated its 2017 KJ32 risk assessment - see above
Noted that NEODyS has updated its 2017 KQ27 risk assessment - see above
Grabbed MPEC 2017-L22 - Daily Orbit Update - see above
Grabbed MPEC 2017-L23 - 2017 KY34 - see above
Grabbed MPEC 2017-L24 - 2017 LC - see above
Grabbed MPEC 2017-L25 - 2017 LD - see above
Grabbed MPEC 2017-L26 - 2017 LE - see above