Contents  on 29 May '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 29 May '17

Four objects reported inside ten LD

There are four Solar-System small bodies known to be less than ten lunar distances (LD) from our planet today. Closest is newly announced Moon buzzer 2017 KW31, which moves in from 5.69 to 3.37 LD. It will skim past the Earth-Moon system as it passes the Moon at 0.45 LD on May 31st. Much further out, 2017 KJ27 is inbound from 8.52 to 6.49 LD, 2017 HU49 is outbound from 8.66 to 8.94 LD, and radar target 2017 CS comes its closest to Earth on this passage -- 7.93 LD at 1543 UTC.

Three objects are on approach: radar target 418094 2007 WV4 enters ten LD on May 31st, risk-listed 2017 KQ27 on June 2nd, and 2017 KR27 on June 3rd.

This report was generated at 1910 UTC with the discoveries of 2017 KW31 (MPEC) and already departed 2017 KT31 (MPEC), which passed Earth at 9.19 LD on May 20th. Today's DOU MPEC has first follow-up for 2017 KQ27, 2017 KR27, which was discovered from China by Purple Mountain Observatory's Xuyi Station, and departed risk-listed intruder 2017 JB2 (15.34 days added to 3.67-day discovery arc), which zoomed past Earth at 0.145-LD on May 4th. The DOU also has continuing follow-up for 2017 KW4, 2017 HU49, 2017 CS, and two departed objects: 2017 JP2 and risk-listed intruder 2017 HG4 (24.62 days added to 7.10-day observation arc), as well as distant 484402 2007 XH16.



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. "Moon buzzer" is used here to describe an object that passes the Moon at less than one Earth-Moon lunar distance but does not enter the Earth-Moon system on this passage, and "distant" describes an object that has come within ten LD since A/CC began these traffic reports (2007) but is not now 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.

Radar Astrometry  on 29 May '17

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 2100 UTC when the database was dated 29 May

NEOCP Activity  on 29 May '17

The MPC's NEO Confirmation Page has 42 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 42 objects listed. Of these, 23 were "one nighters." So far The Tracking News has counted a total of 72 listings on the NEOCP today.

New MPECs  on 29 May '17

Minor Planet Electronic Circulars

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


MPEC 2017-K87 - "15:08 UT" - 2013 MD6


MPEC 2017-K86 - "14:46 UT" - 2017 KW31


MPEC 2017-K85 - "14:43 UT" - 2017 KO31


MPEC 2017-K84 - "14:39 UT" - 2017 KV31


MPEC 2017-K83 - "14:36 UT" - 2017 KU31


MPEC 2017-K82 - "14:32 UT" - 2017 KT31


MPEC 2017-K81 - "14:22 UT" - 2017 KS31


MPEC 2017-K80 - "14:19 UT" - 2017 KR31


MPEC 2017-K79 - "14:16 UT" - 2017 KQ31


MPEC 2017-K78 - "14:11 UT" - 2017 KP31


MPEC 2017-K77 - "13:57 UT" - 2011 JW10


MPEC 2017-K76 - "13:02 UT" - 2004 KB


<< DOU on 29 May '17 >>  MPEC 2017-K75 - "12:03 UT" - Daily Orbit Update

Observers  on 29 May '17

A total of 47 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 1 in MPEC 2017-K75 -- 2017 CS
705"Kristie Nault via Apache Point Obs. in New Mexico, 1 in MPEC 2017-K78 -- 2017 KP31
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-K86 -- 2017 KW31
T05ATLAS Haleakala in Hawaii, 6 in MPEC 2017-K75 -- 2013 CL118, 2011 ED78, 222073, 163696, 7888, 2329
T08ATLAS Mauna Loa in Hawaii, 7 in MPEC 2017-K75 -- 2017 KR27, 2005 GL9, 475665, 190166, 136923, 1980, 1917
B66Casasco Obs. in Italy, 5 in MPEC 2017-K75 -- 2017 CS, 2005 GL9, 222073, 190166, 2329
160Castelmartini Obs. in Italy, 16 in MPECs 2017-K75, 2017-K80 & 2017-K86 -- 2017 KW31, 2017 KR31, 2017 CS, 2011 ED78, 2005 GL9, 66391, 481532, 475665, 416584, 222073, 190166, 163696, 142561, 100926, 7888, 1917
703Catalina Sky Survey (CSS) in Arizona, 27 in MPECs 2017-K75 & 2017-K86 -- 2017 KW31, 2017 HY50, 2017 GQ6, 2013 BR45, 2005 GL9, 488465, 484517, 484402, 481532, 474425, 374038, 332408, 276468, 260141, 242191, 190166, 159560, 141056, 138359, 137170, 11398, 106589, 100926, 6063, 5653, 5626, 5604
309&Marco Micheli via Cerro Paranal in Chile, 1 in MPEC 2017-K75 -- 2017 HG4
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPECs 2017-K75, 2017-K81, 2017-K83 & 2017-K84 -- 2017 KV31, 2017 KU31, 2017 KS31, 2017 KP4, 2017 KF3, 2017 KE5, 2017 JV2, 2017 JB, 2017 HO49
K65Cesena Obs. in Italy, 1 in MPEC 2017-K86 -- 2017 KW31
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2017-K86 -- 2017 KW31
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 5 in MPECs 2017-K77, 2017-K79, 2017-K80, 2017-K81 & 2017-K82 -- 2017 KT31, 2017 KS31, 2017 KR31, 2017 KQ31, 2011 JW10
734Farpoint Obs. in Kansas, 3 in MPECs 2017-K75, 2017-K77 & 2017-K83 -- 2017 KU31, 2017 KK27, 2011 JW10
K88GINOP-KHK in Hungary, 2 in MPECs 2017-K80 & 2017-K86 -- 2017 KW31, 2017 KR31
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 418094
K73Gravina Obs. in Italy, 1 in MPEC 2017-K75 -- 6063
J95Great Shefford Obs. in England, 2 in MPECs 2017-K80 & 2017-K82 -- 2017 KT31, 2017 KR31
A17Guidestar Obs. in Germany, 1 in MPEC 2017-K80 -- 2017 KR31
W86LCOGT Cerro Tololo B in Chile, 2 in MPECs 2017-K83 & 2017-K84 -- 2017 KV31, 2017 KU31
K92LCOGT Sutherland B in South Africa, 1 in MPEC 2017-K84 -- 2017 KV31
H01Magdalena Ridge Obs. (MRO) in New Mexico, 8 in MPECs 2017-K76, 2017-K77, 2017-K78, 2017-K79, 2017-K80, 2017-K81, 2017-K82 & 2017-K84 -- 2017 KV31, 2017 KT31, 2017 KS31, 2017 KR31, 2017 KQ31, 2017 KP31, 2011 JW10, 2004 KB
568_Marco Micheli on Mauna Kea in Hawaii, 8 in MPECs 2017-K76, 2017-K77, 2017-K78, 2017-K79, 2017-K80, 2017-K81, 2017-K83 & 2017-K84 -- 2017 KV31, 2017 KU31, 2017 KS31, 2017 KR31, 2017 KQ31, 2017 KP31, 2011 JW10, 2004 KB
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2017-K75 -- 2015 ME54, 4055
118Modra Obs. in Slovakia, 1 in MPEC 2017-K80 -- 2017 KR31
474Mt. John Obs. in New Zealand, 15 in MPECs 2017-K75, 2017-K83, 2017-K84 & 2017-K86 -- 2017 KW31, 2017 KV31, 2017 KU31, 2017 KJ3, 2017 KH3, 2017 KB3, 2017 JW1, 2017 JT2, 2017 JP2, 2017 HV4, 2017 HU49, 2017 FX64, 2015 KJ57, 2014 UD206, 288592
G96Mt. Lemmon Survey (MLS) in Arizona, 16 in MPECs 2017-K75 & 2017-K82 -- 2017 KT31, 2017 KS4, 2017 KO27, 2017 KF3, 2017 JW2, 2017 HW48, 2017 HN3, 2017 HK49, 2015 ME54, 2014 KF91, 2014 JG78, 2009 WC52, 2008 KD6, 488494, 265032, 141056
Z80Northolt Branch Obs. in England, 5 in MPEC 2017-K75 -- 2005 GL9, 456651, 6063, 2329, 2102
J43Oukaimeden Obs. in Morocco, 2 in MPEC 2017-K75 -- 190166, 100926
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPECs 2017-K75, 2017-K76, 2017-K77, 2017-K78, 2017-K79, 2017-K80, 2017-K81, 2017-K83 & 2017-K84 -- 2017 KV31, 2017 KU31, 2017 KS31, 2017 KR31, 2017 KQ31, 2017 KP31, 2011 JW10, 2004 KB, 339492
K63Pascoli Obs. in Italy, 1 in MPEC 2017-K86 -- 2017 KW31
A48Povegliano Veronese Obs. in Italy, 1 in MPEC 2017-K75 -- 2017 CS
D29Purple Mtn. Obs. Xuyi Station in China, 7 in MPEC 2017-K75 -- 2017 KJ3, 2007 ML6, 474425, 374038, 142781, 5653, 4341
W25RMS Obs., 1 in MPEC 2017-K80 -- 2017 KR31
619Sabadell Obs. in Spain, 1 in MPEC 2017-K75 -- 6063
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2017-K80 & 2017-K86 -- 2017 KW31, 2017 KR31
H36Sandlot Obs. in Kansas, 1 in MPEC 2017-K80 -- 2017 KR31
Y00SONEAR in Brazil, 1 in MPEC 2017-K75 -- 2017 CS
691Spacewatch 0.9m telescope in Arizona, 6 in MPECs 2017-K75, 2017-K78, 2017-K79 & 2017-K83 -- 2017 KU31, 2017 KQ31, 2017 KQ27, 2017 KP31, 2017 HG2, 2010 SH15
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2017-K75, 2017-K76 & 2017-K79 -- 2017 KQ31, 2017 BL6, 2014 NZ64, 2004 KB
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-K75 -- 475665
I52Steward Obs. Mt. Lemmon Station in Arizona, 19 in MPECs 2017-K75, 2017-K76, 2017-K78, 2017-K80, 2017-K82 & 2017-K86 -- 2017 KZ4, 2017 KX4, 2017 KW31, 2017 KV4, 2017 KT31, 2017 KR4, 2017 KR31, 2017 KR27, 2017 KP31, 2017 KO27, 2017 KK27, 2017 KF5, 2017 KE5, 2017 KA5, 2017 JW2, 2017 JU1, 2017 HP49, 2017 DT37, 2004 KB
926Tenagra II Obs. in Arizona, 10 in MPECs 2017-K75, 2017-K76, 2017-K78, 2017-K79, 2017-K80, 2017-K82, 2017-K83, 2017-K84 & 2017-K86 -- 2017 KX4, 2017 KW4, 2017 KW31, 2017 KV31, 2017 KU31, 2017 KT31, 2017 KR31, 2017 KQ31, 2017 KP31, 2004 KB
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 5 in MPECs 2017-K75, 2017-K81, 2017-K85 & 2017-K87 -- 2017 KS31, 2017 KQ27, 2017 KO31, 2017 JB2, 2013 MD6
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2017-K85 -- 2017 KO31
Z92West Park Obs. in England, 1 in MPEC 2017-K75 -- 2017 CS
C51WISE in Earth polar orbit, 1 in MPEC 2017-K85 -- 2017 KO31
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 May '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 Sentry16002101-210822.6053e-07-7.16-7.200JPL: Computed at 08:29 today Pacific time based on 17 observations spanning 3.9662 days (2017-May-25.30459 to 2017-May-29.2708). Diameter approximately 0.025 km. from weighted mean H=25.67.
2017 KB3JPL Sentry16002080-2115252.8626999e-06-5.77-6.330JPL: Computed at 08:46 today Pacific time based on 38 observations spanning 11.227 days (2017-May-17.21791 to 2017-May-28.444519). Diameter approximately 0.035 km. from weighted mean H=24.93.
2017 JB2JPL Sentry16002110-211129.468e-07-8.47-8.750JPL: Computed at 08:01 today Pacific time based on 28 observations spanning 19.004 days (2017-May-06.44444 to 2017-May-25.448791). Diameter approximately 0.005 km. from weighted mean H=29.04.
2017 HG4JPL Sentry16002048-2115233.949287e-05-5.88-6.590JPL: Computed at 08:32 today Pacific time based on 34 observations spanning 31.722 days (2017-Apr-26.26272 to 2017-May-27.985182). Diameter approximately 0.010 km. from weighted mean H=27.65.

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 29 May '17

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

2100Noted Radar Astrometry database update - see above
1910Generated Traffic Report
1600Noted that JPL Sentry has updated its 2017 HG4 risk assessment - see above
Noted that JPL Sentry has updated its 2017 JB2 risk assessment - see above
Noted that JPL Sentry has updated its 2017 KB3 risk assessment - see above
Noted that JPL Sentry has updated its 2017 KQ27 risk assessment - see above
Grabbed MPEC 2017-K75 - Daily Orbit Update - see above
Grabbed MPEC 2017-K76 - 2004 KB - see above
Grabbed MPEC 2017-K77 - 2011 JW10 - see above
Grabbed MPEC 2017-K78 - 2017 KP31 - see above
Grabbed MPEC 2017-K79 - 2017 KQ31 - see above
Grabbed MPEC 2017-K80 - 2017 KR31 - see above
Grabbed MPEC 2017-K81 - 2017 KS31 - see above
Grabbed MPEC 2017-K82 - 2017 KT31 - see above
Grabbed MPEC 2017-K83 - 2017 KU31 - see above
Grabbed MPEC 2017-K84 - 2017 KV31 - see above
Grabbed MPEC 2017-K85 - 2017 KO31 - see above
Grabbed MPEC 2017-K86 - 2017 KW31 - see above
Grabbed MPEC 2017-K87 - 2013 MD6 - see above