Contents  on 31 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 31 May '17

Five objects reported inside ten LD

Five visitors are reported moving inside ten lunar distances (LD) of our home world today. Nearest is 2017 KW31, which buzzed the Moon at 0.45 LD at 0730 UTC, 24 minutes after passing us at 1.23 LD. Much further out, radar target 418094 2007 WV4 enters our ten-LD traffic reporting sphere, coming in from 11.19 to 8.39 LD. This previously well observed object has not yet been reported from optical telescopes, but it was recovered by radar as posted in the past two days, noted here and here.

Earth passage I D ~Size Distance Today  Notes
1.23 LD today2017 KW31 16 m  1.23 LD Moon buzzer today, inside Earth SOI, Earth closest at 0706 UTC, Moon closest 0.45 LD at 0730 - DOU
5.56 LD May 112017 HU49 18 m  9.22 to 9.50 LD
6.03 LD yesterday2017 KJ27 27 m  6.16 to 7.75 LD
7.93 LD May 292017 CS 446 m  8.39 to 9.27 LD radar target - DOU
7.96 LD June 1418094 2007 WV4 467 m  8.39 from 11.19 LD enters ten LD, radar target - radar, radar
Approaching
1.02 LD June 62017 KQ27 24 m  < 10 LD June 2, risk - DOU
7.00 LD June 62017 KR27 64 m  < 10 LD June 3 - DOU

This report was generated at 1941 UTC with first follow-up for 2017 KW31 in today's DOU MPEC along with continuing follow-up for 2017 KR27, 2017 KQ27, 2017 CS, departed 2017 KT31, and distant 484402 2007 XH16. Today's DOU also reports the discovery of two departed objects: 2017 JC6, which passed Earth at 3.77 LD on April 29th, and risk-listed 2017 HJ61, which went by at about 1.3 LD on April 23rd.



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 presently not 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 31 May '17

The MPC's NEO Confirmation Page has 47 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 47 objects listed. Of these, nineteen were "one nighters." So far The Tracking News has counted a total of 69 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 31 May '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-K96 - "22:38 UT" - 2008 MH1


MPEC 2017-K95 - "14:44 UT" - 2014 MO60


<< DOU on 31 May '17 >>  MPEC 2017-K94 - "12:02 UT" - Daily Orbit Update


MPEC 2017-K93 - "01:51 UT" - 2017 KK32


MPEC 2017-K92 - "01:46 UT" - 2017 KL32


MPEC 2017-K91 - "01:43 UT" - 2017 KJ32

Observers  on 31 May '17

A total of 37 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 5 in MPEC 2017-K94 -- 2017 KU4, 2017 KJ5, 2008 KV28, 488494, 481532
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2017-K91, 2017-K92 & 2017-K93 -- 2017 KL32, 2017 KK32, 2017 KJ32
T05ATLAS Haleakala in Hawaii, 9 in MPEC 2017-K94 -- 2017 GU6, 2014 KF91, 68063, 427643, 162149, 136923, 4957, 4503, 3199
T08ATLAS Mauna Loa in Hawaii, 6 in MPEC 2017-K94 -- 484402, 456651, 154144, 11398, 7888, 2329
B66Casasco Obs. in Italy, 1 in MPEC 2017-K94 -- 2017 CS
160Castelmartini Obs. in Italy, 7 in MPEC 2017-K94 -- 2017 HY50, 2017 CS, 2013 CL118, 2005 GL9, 416584, 142561, 142040
703Catalina Sky Survey in Arizona, 1 in MPEC 2017-K94 -- 2329
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2017-K94 -- 154590
734Farpoint Obs. in Kansas, 2 in MPECs 2017-K91 & 2017-K94 -- 2017 KV4, 2017 KJ32
K73Gravina Obs. in Italy, 1 in MPEC 2017-K94 -- 2017 CS
J95Great Shefford Obs. in England, 1 in MPEC 2017-K94 -- 2017 KW31
238Grorudalen Obs. in Norway, 1 in MPEC 2017-K94 -- 2017 CS
Z43Landehen Obs., 3 in MPEC 2017-K94 -- 2017 CS, 190166, 11398
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-K94 -- 2017 JC6
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2017-K94 -- 11398
568_Marco Micheli on Mauna Kea in Hawaii, 2 in MPEC 2017-K94 -- 2017 HK61, 2017 HJ61
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2017-K94 -- 2017 CS
118Modra Obs. in Slovakia, 1 in MPEC 2017-K94 -- 2329
474Mt. John Obs. in New Zealand, 2 in MPECs 2017-K92 & 2017-K94 -- 2017 KW31, 2017 KL32
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2017-K91, 2017-K92, 2017-K93 & 2017-K94 -- 2017 KL32, 2017 KK32, 2017 KJ32, 2017 JC6
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2017-K94 -- 2013 MD6
C47Nonndorf Obs. in Austria, 1 in MPEC 2017-K94 -- 2017 CS
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2017-K94 -- 2017 CS
F51Pan-STARRS 1 (PS1) in Hawaii, 16 in MPECs 2017-K91, 2017-K92, 2017-K94 & 2017-K96 -- 2017 KL32, 2017 KJ32, 2017 JW2, 2017 JL2, 2017 HK61, 2017 HJ61, 2017 HA49, 2016 JH12, 2015 ME54, 2010 JU39, 2008 MH1, 305090, 265032, 242191, 222073, 185716
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 17 in MPEC 2017-K94 -- 2017 KR27, 2017 HY50, 2017 HN3, 2017 GQ6, 2017 DS35, 2017 CS, 2015 ME54, 2014 KF91, 2013 CL118, 2011 ED78, 2005 MO13, 2005 GL9, 2004 JR, 484402, 190166, 11398, 6063
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 2 in MPEC 2017-K94 -- 2017 KT31, 2017 KP31
A48Povegliano Veronese Obs. in Italy, 1 in MPEC 2017-K94 -- 2017 CS
L04ROASTERR-1 in Romania, 2 in MPEC 2017-K94 -- 2017 KW31, 2017 CS
619Sabadell Obs. in Spain, 1 in MPEC 2017-K94 -- 2017 CS
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2017-K91 & 2017-K93 -- 2017 KK32, 2017 KJ32
G403Tony Evans in Portugal via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-K94 -- 2017 KR27
Y00SONEAR in Brazil, 3 in MPEC 2017-K94 -- 66391, 3122, 1980
691Spacewatch 0.9m telescope in Arizona, 7 in MPEC 2017-K94 -- 2017 KZ4, 2017 KP4, 2017 KP31, 2017 KE3, 2017 HR49, 2016 WO1, 2014 JG78
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2017-K94 -- 2017 ER22, 2004 JQ1
I52Steward Obs. Mt. Lemmon Station in Arizona, 5 in MPECs 2017-K91, 2017-K92, 2017-K93 & 2017-K94 -- 2017 KT4, 2017 KL32, 2017 KK32, 2017 KJ32, 2017 JC6
926Tenagra II Obs. in Arizona, 5 in MPECs 2017-K91, 2017-K92 & 2017-K94 -- 2017 KW31, 2017 KL32, 2017 KJ32, 2017 JC6, 2004 KB
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPECs 2017-K94 & 2017-K95 -- 2017 KQ27, 2016 XF18, 2014 MO60
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 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 KQ27NEODyS16192080-211751.73e-06-6.45-6.470NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2017-05-25.305 to 2017-05-29.393."
2017 HJ61JPL Sentry16192024-208991.0311141e-05-6.15-6.180JPL: Computed at 07:55 today Pacific time based on 6 observations spanning .97706 days (2017-Apr-27.4186 to 2017-Apr-28.395655). Diameter approximately 0.006 km. from weighted mean H=28.82.
2008 UB7JPL Sentry17302044-2100333.4756026e-05-3.71-4.310JPL: Computed at 10:20 today Pacific time based on 66 observations spanning 4.8668 days (2008-Oct-26.25877 to 2008-Oct-31.12558). Diameter approximately 0.057 km. from weighted mean H=23.85.

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 31 May '17

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

2300Grabbed MPEC 2017-K96 - 2008 MH1 - see above
1941Generated Traffic Report
1730Noted that JPL Sentry has updated its 2008 UB7 risk assessment - see above
1619Noted that JPL Sentry has posted 2017 HJ61 as an impact risk - see above
Noted that NEODyS has updated its 2017 KQ27 risk assessment - see above
Grabbed MPEC 2017-K94 - Daily Orbit Update - see above
Grabbed MPEC 2017-K95 - 2014 MO60 - see above
0203Grabbed MPEC 2017-K91 - 2017 KJ32 - see above
Grabbed MPEC 2017-K92 - 2017 KL32 - see above
Grabbed MPEC 2017-K93 - 2017 KK32 - see above