Contents  on 2 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 2 June '17

Five objects reported inside ten LD

Five transient natural objects are reported inside ten lunar distances (LD) of our planet today. Closest are 2017 KW31, outbound from 4.30 to 6.66 LD, and risk-listed 2017 KJ32, which moves away from 5.05 to 5.57 LD.

Earth passage I D ~Size Distance Today  Notes
1.02 LD June 62017 KQ27 24 m  8.72 from 11.10 LD enters ten LD, risk - DOU
1.23 LD May 312017 KW31 16 m  4.30 to 6.66 LD Moon buzzer
1.90 LD May 242017 KJ32 6 m  5.05 to 5.57 LD NEW, risk - MPEC, DOU
5.56 LD May 112017 HU49 18 m  9.78 to 10.07 LD exits ten LD
7.96 LD yesterday418094 2007 WV4 467 m  8.37 to 11.15 LD exits ten LD, radar target
Approaching
6.99 LD June 62017 KR27 65 m  < 10 LD tomorrow - DOU

With this report, generated at 1920 UTC, we add to our reporting two discoveries that were announced two days ago: risk-listed 2017 KJ32 (MPEC, DOU) and departed 2017 KK32 (MPEC, DOU, DOU), which passed us at 8.84 LD May 26th. Today's DOU MPEC has follow-up for 2017 KR27 and 2017 KQ27 plus five departed objects: 2017 KT31, 2017 KP27, 2017 KN27, radar target 2017 CS, and risk-listed 2017 KH5, along with astrometry from May for 2017 JM2 and risk-listed 2017 KH5 and, from February, for radar targets 2017 BY93 and NHATS target 2017 BW.

Note:  In today's MPECs you may notice several for objects with curious IAU designations. These MPECs report observations of unnumbered (and unnamed) outer "irregular" satellites of Jupiter.



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 2 June '17

The MPC's NEO Confirmation Page has 19 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nineteen objects listed. Of these, five were "one nighters." So far The Tracking News has counted a total of 48 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 2 June '17

Minor Planet Electronic Circulars

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


MPEC 2017-L21 - "23:24 UT" - S/2003 J 5


MPEC 2017-L20 - "22:00 UT" - 2017 KO34


MPEC 2017-L19 - "21:58 UT" - 2017 LA


MPEC 2017-L18 - "21:55 UT" - 2017 KV34


MPEC 2017-L17 - "21:52 UT" - 2017 KU34


MPEC 2017-L16 - "21:49 UT" - 2017 KT34


MPEC 2017-L15 - "21:46 UT" - 2017 KS34


MPEC 2017-L14 - "21:43 UT" - 2017 KR34


MPEC 2017-L13 - "21:41 UT" - 2017 KQ34


MPEC 2017-L12 - "21:38 UT" - 2017 KP34


MPEC 2017-L11 - "21:34 UT" - 2017 KN34


MPEC 2017-L10 - "16:52 UT" - S/2011 J 2


MPEC 2017-L09 - "16:04 UT" - S/2003 J 18


MPEC 2017-L08 - "15:56 UT" - S/2016 J 1


<< DOU on 2 June '17 >>  MPEC 2017-L07 - "12:02 UT" - Daily Orbit Update

Observers  on 2 June '17

A total of 34 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-L14 -- 2017 KR34
H21Astronomical Research Obs. Westfield in Illinois, 22 in MPECs 2017-L07, 2017-L12, 2017-L13, 2017-L15, 2017-L19 & 2017-L20 -- 2017 LA, 2017 KT4, 2017 KT31, 2017 KS34, 2017 KR4, 2017 KR27, 2017 KQ34, 2017 KP34, 2017 KO34, 2017 KN27, 2017 KK3, 2017 KK27, 2017 JU1, 2017 JL2, 2017 JF3, 2017 HY50, 2017 HW48, 2017 HA49, 2017 GQ6, 2017 GM7, 2017 FW64, 2011 OJ5
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2017-L14 -- 2017 KR34
T08ATLAS Mauna Loa in Hawaii, 2 in MPEC 2017-L07 -- 2017 HW48, 190166
160Castelmartini Obs. in Italy, 12 in MPEC 2017-L07 -- 2011 ED78, 2005 GL9, 68348, 475665, 222073, 190166, 163696, 100926, 7888, 3352, 2329, 1917
703Catalina Sky Survey (CSS) in Arizona, 13 in MPEC 2017-L07 -- 2017 HW48, 2014 SZ303, 2014 KF91, 475665, 190166, 162149, 141670, 136923, 136818, 106589, 100926, 5751, 1980
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPECs 2017-L07, 2017-L16, 2017-L17 & 2017-L18 -- 2017 KV34, 2017 KU34, 2017 KT34, 2017 KR27, 2017 KQ27, 2017 KP27, 2017 KO4, 2017 JE3
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2017-L11 -- 2017 KN34
734Farpoint Obs. in Kansas, 1 in MPEC 2017-L12 -- 2017 KP34
F652Lothar Kurtze in Germany via Faulkes Telescope North in Hawaii, 1 in MPEC 2017-L14 -- 2017 KR34
K88GINOP-KHK in Hungary, 1 in MPEC 2017-L13 -- 2017 KQ34
J95Great Shefford Obs. in England, 2 in MPECs 2017-L15 & 2017-L19 -- 2017 LA, 2017 KS34
W86LCOGT Cerro Tololo B in Chile, 5 in MPECs 2017-L14, 2017-L15, 2017-L16, 2017-L17 & 2017-L18 -- 2017 KV34, 2017 KU34, 2017 KT34, 2017 KS34, 2017 KR34
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-L11 -- 2017 KN34
568_Marco Micheli on Mauna Kea in Hawaii, 4 in MPECs 2017-L15, 2017-L16, 2017-L17 & 2017-L18 -- 2017 KV34, 2017 KU34, 2017 KT34, 2017 KS34
474Mt. John Obs. in New Zealand, 2 in MPECs 2017-L13 & 2017-L14 -- 2017 KR34, 2017 KQ34
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2017-L07, 2017-L11, 2017-L12 & 2017-L13 -- 2017 KR31, 2017 KQ34, 2017 KP34, 2017 KN34, 2017 GM7, 456651, 339492, 275677, 222073, 7888
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2017-L07 -- 66391
F51Pan-STARRS 1 (PS1) in Hawaii, 12 in MPECs 2017-L07, 2017-L12, 2017-L13, 2017-L14, 2017-L15, 2017-L16, 2017-L17, 2017-L18, 2017-L19 & 2017-L20 -- 2017 LA, 2017 KV34, 2017 KU34, 2017 KT34, 2017 KS34, 2017 KR34, 2017 KQ34, 2017 KP34, 2017 KO34, 250614, 7888, 5879
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2017-L12 -- 2017 KP34
A48Povegliano Veronese Obs. in Italy, 1 in MPEC 2017-L07 -- 2017 CS
W25RMS Obs., 2 in MPECs 2017-L14 & 2017-L19 -- 2017 LA, 2017 KR34
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2017-L12, 2017-L13 & 2017-L19 -- 2017 LA, 2017 KQ34, 2017 KP34
H36Sandlot Obs. in Kansas, 1 in MPEC 2017-L13 -- 2017 KQ34
204Schiaparelli Obs. in Italy, 23 in MPECs 2017-L07, 2017-L13, 2017-L14 & 2017-L19 -- 2017 LA, 2017 KT4, 2017 KR34, 2017 KQ34, 2017 KH5, 2017 KF3, 2017 JM2, 2017 JB, 2017 HY50, 2017 HN3, 2017 CS, 2017 BY93, 2017 BW, 2017 BQ31, 2017 BN3, 2017 BM123, 2017 BL6, 2017 BL32, 2017 BK92, 2016 SM3, 2008 SD, 484199, 481532
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-L07 -- 2017 HW1
587Sormano Obs. in Italy, 1 in MPEC 2017-L14 -- 2017 KR34
691Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2017-L07, 2017-L13 & 2017-L19 -- 2017 LA, 2017 KV4, 2017 KQ34, 2017 KL3, 2017 KE3, 2017 HY50, 2017 GQ4
291Spacewatch 1.8m telescope in Arizona, 8 in MPECs 2017-L07 & 2017-L12 -- 2017 KZ4, 2017 KP34, 2017 KN4, 2017 KK3, 2017 KJ32, 2017 KA3, 2009 SX1, 2007 NQ
I52Steward Obs. Mt. Lemmon Station in Arizona, 11 in MPECs 2017-L07, 2017-L11, 2017-L12, 2017-L13, 2017-L15, 2017-L19 & 2017-L20 -- 2017 LA, 2017 KS34, 2017 KR31, 2017 KQ34, 2017 KP34, 2017 KO34, 2017 KO27, 2017 KN34, 2017 KL32, 2017 KK32, 2017 KK27
926Tenagra II Obs. in Arizona, 9 in MPECs 2017-L07, 2017-L11, 2017-L12, 2017-L13, 2017-L14, 2017-L15 & 2017-L19 -- 2017 LA, 2017 KS34, 2017 KR34, 2017 KR27, 2017 KQ34, 2017 KP34, 2017 KN34, 2017 KF3, 2017 HY50
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2017-L07 -- 2017 KQ27, 2017 KM27, 2017 KK27
K41Vegaquattro Obs. in Italy, 1 in MPEC 2017-L07 -- 190166
C51WISE in Earth polar orbit, 3 in MPECs 2017-L07 & 2017-L20 -- 2017 KO34, 2017 HH, 175189
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 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 KQ27JPL Sentry1543R E M O V E DJPL: Risk listing removed at 1529 UTC today.
NEODyS15172080-211722.24e-06-6.37-6.370NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2017-05-25.305 to 2017-05-31.480."
2017 KH5JPL Sentry15172067-207422.343e-07-7.80-8.090JPL: Computed at 07:55 today Pacific time based on 47 observations spanning .97523 days (2017-May-24.39387 to 2017-May-25.3691). Diameter approximately 0.010 km. from weighted mean H=27.58.
2017 JB2NEODyS15172092-210232.75e-08-9.93-10.250NEODyS: "Based on 30 optical observations (of which 1 are rejected as outliers) from 2017-05-06.445 to 2017-05-29.471."
1991 VGNEODyS1630R E M O V E D-

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 2 June '17

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

2326Grabbed MPEC 2017-L21 - S/2003 J 5 - see above
2240Grabbed MPEC 2017-L11 - 2017 KN34 - see above
Grabbed MPEC 2017-L12 - 2017 KP34 - see above
Grabbed MPEC 2017-L13 - 2017 KQ34 - see above
Grabbed MPEC 2017-L14 - 2017 KR34 - see above
Grabbed MPEC 2017-L15 - 2017 KS34 - see above
Grabbed MPEC 2017-L16 - 2017 KT34 - see above
Grabbed MPEC 2017-L17 - 2017 KU34 - see above
Grabbed MPEC 2017-L18 - 2017 KV34 - see above
Grabbed MPEC 2017-L19 - 2017 LA - see above
Grabbed MPEC 2017-L20 - 2017 KO34 - see above
1920Generated Traffic Report
1700Grabbed MPEC 2017-L10 - S/2011 J 2 - see above
1630Noted that NEODyS has removed 1991 VG as an impact risk - see above
Grabbed MPEC 2017-L09 - S/2003 J 18 - see above
1602Grabbed MPEC 2017-L08 - S/2016 J 1 - see above
1543Noted that JPL Sentry has removed 2017 KQ27 as an impact risk - see above
1517Noted that NEODyS has updated its 2017 JB2 risk assessment - see above
Noted that JPL Sentry has updated its 2017 KH5 risk assessment - see above
Noted that NEODyS has updated its 2017 KQ27 risk assessment - see above
Grabbed MPEC 2017-L07 - Daily Orbit Update - see above