Contents  on 4 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 4 June '17

Six objects reported inside ten LD

There are six asteroids known to be less than ten lunar distances (LD) from our planet today. Closest is risk-listed 2017 LD, inbound from 3.37 to 3.03 LD.

Earth passage I D ~Size Distance Today  Notes
1.02 LD June 62017 KQ27 24 m  4.02 from 6.36 LD risk - DOU
1.23 LD May 312017 KW31 17 m  9.05 to 11.46 LD exits ten LD, Moon buzzer
1.90 LD May 242017 KJ32 6 m  6.09 to 6.62 LD risk
3.00 LD tomorrow2017 LD 9 m  3.03 from 3.37 LD risk - DOU
5.19 LD June 72017 LE 20 m  6.68 from 8.10 LD DOU
6.99 LD June 62017 KR27 66 m  7.70 from 9.24 LD DOU

This report was generated at 2110 UTC with follow-up in today's DOU MPEC for four objects in the active traffic table here plus departed radar target 2017 CS.



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 4 June '17

The MPC's NEO Confirmation Page has 12 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had twelve objects listed. Of these, one was a "one nighter." So far The Tracking News has counted a total of fourteen 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 4 June '17

Minor Planet Electronic Circulars

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


MPEC 2017-L44 - "15:09 UT" - 2015 RW245


MPEC 2017-L43 - "15:06 UT" - 2015 RV245


MPEC 2017-L42 - "15:04 UT" - 2015 RU245


MPEC 2017-L41 - "15:01 UT" - 2015 RT245


MPEC 2017-L40 - "14:59 UT" - 2014 UM225


MPEC 2017-L39 - "14:56 UT" - 2014 UL225


MPEC 2017-L38 - "14:54 UT" - 2014 UK225


MPEC 2017-L37 - "14:48 UT" - 2014 UJ225


MPEC 2017-L36 - "14:45 UT" - 2014 UH225


MPEC 2017-L35 - "14:43 UT" - 2013 US15


MPEC 2017-L34 - "14:40 UT" - 2013 UR15


MPEC 2017-L33 - "14:38 UT" - 2013 UQ15


MPEC 2017-L32 - "14:35 UT" - 2013 SA100


MPEC 2017-L31 - "14:33 UT" - 2013 SZ99


MPEC 2017-L30 - "14:25 UT" - 2017 LG


MPEC 2017-L29 - "14:21 UT" - 2017 LF


MPEC 2017-L28 - "14:15 UT" - 2008 EM85


<< DOU on 4 June '17 >>  MPEC 2017-L27 - "12:02 UT" - Daily Orbit Update

Observers  on 4 June '17

A total of 25 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-L27 -- 2017 LD
H21Astronomical Research Obs. Westfield in Illinois, 26 in MPECs 2017-L27, 2017-L29 & 2017-L30 -- 2017 LG, 2017 LF, 2017 LE, 2017 LD, 2017 KZ4, 2017 KT4, 2017 KS4, 2017 KR4, 2017 KR31, 2017 KR27, 2017 KO27, 2017 KK27, 2017 KE5, 2017 KE3, 2017 JU1, 2017 JL2, 2017 HY50, 2017 HW48, 2017 HN3, 2017 GQ6, 2017 AC5, 2016 LE51, 2016 JH12, 2013 CL118, 329774, 24443
T05ATLAS Haleakala in Hawaii, 5 in MPEC 2017-L27 -- 2017 GU6, 480934, 136923, 4341, 1980
T08ATLAS Mauna Loa in Hawaii, 4 in MPEC 2017-L27 -- 222073, 11398, 7888, 2329
160Castelmartini Obs. in Italy, 5 in MPECs 2017-L27 & 2017-L30 -- 2017 LG, 2017 CS, 416584, 142040, 6063
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2017-L27 & 2017-L30 -- 2017 LG, 86819, 54789, 3752
006Fabra Obs. in Spain, 2 in MPEC 2017-L27 -- 2005 GL9, 6063
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2017-L29 & 2017-L30 -- 2017 LG, 2017 LF
K88GINOP-KHK in Hungary, 2 in MPECs 2017-L29 & 2017-L30 -- 2017 LG, 2017 LF
J95Great Shefford Obs. in England, 5 in MPECs 2017-L27, 2017-L29 & 2017-L30 -- 2017 LG, 2017 LF, 2017 LE, 2017 LD, 2017 KR27
K91LCOGT Sutherland A in South Africa, 1 in MPEC 2017-L27 -- 2017 KQ27
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-L30 -- 2017 LG
568@Jean-Marc Petit on Mauna Kea in Hawaii, 14 in MPECs 2017-L31, 2017-L32, 2017-L33, 2017-L34, 2017-L35, 2017-L36, 2017-L37, 2017-L38, 2017-L39, 2017-L40, 2017-L41, 2017-L42, 2017-L43 & 2017-L44 -- 2015 RW245, 2015 RV245, 2015 RU245, 2015 RT245, 2014 UM225, 2014 UL225, 2014 UK225, 2014 UJ225, 2014 UH225, 2013 US15, 2013 UR15, 2013 UQ15, 2013 SZ99, 2013 SA100
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2017-L27, 2017-L29 & 2017-L30 -- 2017 LG, 2017 LF, 2017 KS4, 2017 HW48, 2017 HN3, 2014 JG78, 68348, 66391, 434188, 242191
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-L30 -- 2017 LG
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2017-L27 -- 2017 DS35, 333908, 141447
W25RMS Obs., 2 in MPECs 2017-L29 & 2017-L30 -- 2017 LG, 2017 LF
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2017-L29 & 2017-L30 -- 2017 LG, 2017 LF
G403Tony Evans in Portugal via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-L27 -- 2017 CS
Y00SONEAR in Brazil, 2 in MPEC 2017-L27 -- 2005 GL9, 481532
691Spacewatch 0.9m telescope in Arizona, 6 in MPEC 2017-L27 -- 2017 KY34, 2017 KE3, 2016 WO1, 2015 PQ291, 2009 WO106, 2004 BW1
291Spacewatch 1.8m telescope in Arizona, 9 in MPEC 2017-L27 -- 2017 LC, 2017 KZ4, 2017 KV4, 2017 KP4, 2017 KL3, 2017 FP64, 2017 BL6, 2008 SQ7, 2004 JQ1
I52Steward Obs. Mt. Lemmon Station in Arizona, 2 in MPECs 2017-L29 & 2017-L30 -- 2017 LG, 2017 LF
926Tenagra II Obs. in Arizona, 6 in MPECs 2017-L27, 2017-L29 & 2017-L30 -- 2017 LG, 2017 LF, 2017 KR27, 2017 KP31, 2017 KF3, 2017 HN49
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-L28 -- 2008 EM85
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 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 LDNEODyS22002045-21174042.46e-03-3.95-4.450NEODyS #2 for the day: "Based on 53 optical observations (of which 0 are rejected as outliers) from 2017-06-02.203 to 2017-06-04.046."
JPL Sentry16002045-21163090.002719907117-3.95-4.030JPL: Computed at 08:38 today Pacific time based on 53 observations spanning 1.8429 days (2017-Jun-02.20233 to 2017-Jun-04.045229). Diameter approximately 0.009 km. from weighted mean H=27.80.
2017 LCNEODyS1932R E M O V E D-
2017 KQ27NEODyS19322092-211723.38e-06-6.16-6.170NEODyS: "Based on 52 optical observations (of which 1 are rejected as outliers) from 2017-05-25.305 to 2017-06-02.852."
2014 LY21JPL Sentry16002018-21169799.10818880999998e-05-5.00-5.660JPL: Computed at 18:09 April 8th Pacific time based on 11 observations spanning .04506 days (2014-Jun-02.41612 to 2014-Jun-02.46118). Diameter approximately 0.005 km. from weighted mean H=29.20.

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 4 June '17

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

2200Noted that NEODyS has updated its 2017 LD risk assessment - see above
2110Generated Traffic Report
1932Noted that NEODyS has updated its 2017 KQ27 risk assessment - see above
Noted that NEODyS has removed 2017 LC as an impact risk - see above
1600Noted that JPL Sentry has updated its 2014 LY21 risk assessment - see above
Noted that JPL Sentry has updated its 2017 LD risk assessment - see above
1515Noted that NEODyS has posted 2017 LD as an impact risk - see above
Grabbed MPEC 2017-L27 - Daily Orbit Update - see above
Grabbed MPEC 2017-L28 - 2008 EM85 - see above
Grabbed MPEC 2017-L29 - 2017 LF - see above
Grabbed MPEC 2017-L30 - 2017 LG - see above
Grabbed MPEC 2017-L31 - 2013 SZ99 - see above
Grabbed MPEC 2017-L32 - 2013 SA100 - see above
Grabbed MPEC 2017-L33 - 2013 UQ15 - see above
Grabbed MPEC 2017-L34 - 2013 UR15 - see above
Grabbed MPEC 2017-L35 - 2013 US15 - see above
Grabbed MPEC 2017-L36 - 2014 UH225 - see above
Grabbed MPEC 2017-L37 - 2014 UJ225 - see above
Grabbed MPEC 2017-L38 - 2014 UK225 - see above
Grabbed MPEC 2017-L39 - 2014 UL225 - see above
Grabbed MPEC 2017-L40 - 2014 UM225 - see above
Grabbed MPEC 2017-L41 - 2015 RT245 - see above
Grabbed MPEC 2017-L42 - 2015 RU245 - see above
Grabbed MPEC 2017-L43 - 2015 RV245 - see above
Grabbed MPEC 2017-L44 - 2015 RW245 - see above