Contents  on 1 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 1 June '17

Five objects reported inside ten LD

There are five asteroidal objects known to be less than ten lunar distances (LD) from Earth today. Nearest is 2017 KW31, which exits Earth's SOI (sphere of gravitational influence), moving out from 2.10 to 4.30 LD.

Earth passage I D ~Size Distance Today  Notes
1.23 LD May 312017 KW31 16 m  2.10 to 4.30 LD exits Earth SOI, Moon buzzer - DOU
5.56 LD May 112017 HU49 18 m  9.50 to 9.78 LD
6.03 LD May 302017 KJ27 27 m  7.75 to 10.42 LD exits ten LD
7.93 LD May 292017 CS 446 m  9.27 to 10.48 LD exits ten LD, radar target - DOU
7.96 LD today418094 2007 WV4 467 m  7.96 LD radar target, Earth closest at 1208 UTC
Approaching
1.02 LD June 62017 KQ27 23 m  < 10 LD tomorrow, risk - DOU
6.99 LD June 62017 KR27 65 m  < 10 LD June 3 - DOU

This report was generated at 1852 UTC with follow-up in today's DOU MPEC for four objects active in the traffic table here along with departed risk-listed intruder 2017 JB2, plus astrometry from April for radar target 2014 JO25.



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 1 June '17

The MPC's NEO Confirmation Page has 41 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 41 objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of 48 listings on the NEOCP today.

New MPECs  on 1 June '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-L06 - "17:39 UT" - Comet C/2017 K6 (Jacques)


MPEC 2017-L05 - "17:29 UT" - Comet C/2017 K5 (Panstarrs)


MPEC 2017-L04 - "17:14 UT" - Comet C/2017 K4 (ATLAS)


MPEC 2017-L03 - "16:40 UT" - Comet P/2017 K3 (Gasparovic)


MPEC 2017-L02 - "15:48 UT" - 1991 VG


<< DOU on 1 June '17 >>  MPEC 2017-L01 - "12:02 UT" - Daily Orbit Update

Observers  on 1 June '17

A total of 41 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 2 in MPECs 2017-L03 & 2017-L04 -- C/2017 K4, P/2017 K3
H21Astronomical Research Obs. Westfield in Illinois, 16 in MPECs 2017-L01 & 2017-L05 -- 2017 KU4, 2017 KR27, 2017 KJ3, 2017 KG5, 2017 KE3, C/2017 K5, 2017 JW1, 2017 JU1, 2017 JL3, 2017 HY50, 2017 HW48, 2017 HN3, 2017 HM49, 2017 HK1, 2017 HH, 2017 HD49
T05ATLAS Haleakala in Hawaii, 2 in MPECs 2017-L01 & 2017-L04 -- C/2017 K4, 190166
I47Auger Obs. in Argentina, 3 in MPECs 2017-L03, 2017-L04 & 2017-L06 -- C/2017 K6, C/2017 K4, P/2017 K3
W96Campo Catino Austral Obs. (CAO) in Chile, 3 in MPECs 2017-L03, 2017-L04 & 2017-L06 -- C/2017 K6, C/2017 K4, P/2017 K3
160Castelmartini Obs. in Italy, 17 in MPEC 2017-L01 -- 2017 CS, 2011 ED78, 2005 GL9, 86819, 68950, 66391, 481532, 475665, 416584, 222073, 190166, 163696, 142040, 141056, 106589, 100926, 6063
309&Marco Micheli via Cerro Paranal in Chile, 1 in MPEC 2017-L02 -- 1991 VG
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2017-L01 -- 2017 KR27, 2017 JU2
A77Chante-Perdrix Obs. in France, 1 in MPEC 2017-L03 -- P/2017 K3
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2017-L04 -- C/2017 K4
734Farpoint Obs. in Kansas, 1 in MPEC 2017-L05 -- C/2017 K5
F652Lothar Kurtze in Germany via Faulkes Telescope North in Hawaii, 1 in MPEC 2017-L03 -- P/2017 K3
E10*program code "*" (19) via Faulkes Telescope South in New South Wales, 1 in MPEC 2017-L04 -- C/2017 K4
I114Joseph Masiero in southern California via Gemini South Obs. in Chile, 1 in MPEC 2017-L01 -- 2017 KO31
K78Iota Scorpii Obs., 2 in MPEC 2017-L01 -- 456651, 154144
U695Hidetaka Sato in Japan via iTelescope Obs. Auberry in northern California, 1 in MPEC 2017-L05 -- C/2017 K5
Q62iTelescope Obs. Siding Spring in New South Wales, 3 in MPECs 2017-L03, 2017-L04 & 2017-L06 -- C/2017 K6, C/2017 K4, P/2017 K3
Q620Ernesto Guido in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-L04 -- C/2017 K4
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 3 in MPECs 2017-L03, 2017-L04 & 2017-L06 -- C/2017 K6, C/2017 K4, P/2017 K3
Q622Marian Urbanik in Slovakia via iTelescope Obs. Siding Spring in New South Wales, 2 in MPECs 2017-L03 & 2017-L04 -- C/2017 K4, P/2017 K3
Q625Cristovao Jacques in Brazil via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-L06 -- C/2017 K6
Q626Erik Bryssinck in Belgium via iTelescope Obs. Siding Spring in New South Wales, 2 in MPECs 2017-L03 & 2017-L04 -- C/2017 K4, P/2017 K3
Q62?B. Lutkenhoner in Germany via iTelescope Obs. Siding Spring in New South Wales, 3 in MPECs 2017-L03, 2017-L04 & 2017-L06 -- C/2017 K6, C/2017 K4, P/2017 K3
Q62[M. Suzuki in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-L04 -- C/2017 K4
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-L04 -- C/2017 K4
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-L04 -- C/2017 K4
K92LCOGT Sutherland B in South Africa, 1 in MPEC 2017-L01 -- 2011 EP51
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-L04 -- C/2017 K4
C10Maisoncelles Obs. in France, 1 in MPEC 2017-L03 -- P/2017 K3
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2017-L01 -- 53319
W92MASTER OAFA Obs., 2 in MPEC 2017-L01 -- 136923, 3122
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-L06 -- C/2017 K6
568_Marco Micheli on Mauna Kea in Hawaii, 2 in MPECs 2017-L04 & 2017-L05 -- C/2017 K5, C/2017 K4
474Mt. John Obs. in New Zealand, 5 in MPECs 2017-L01 & 2017-L06 -- 2017 KW31, 2017 KQ27, 2017 KM27, 2017 KK32, C/2017 K6
J69North Obs. in England, 1 in MPEC 2017-L01 -- 66391
Z80Northolt Branch Obs. in England, 7 in MPEC 2017-L01 -- 2017 KR27, 2017 CS, 2014 KF91, 2005 GL9, 66391, 190166, 6063
Z73Nuevos Horizontes Obs. in Spain, 1 in MPEC 2017-L01 -- 2014 JO25
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPECs 2017-L01 & 2017-L05 -- C/2017 K5, 2017 JW2, 2005 GL9, 489900, 446833, 307493, 11398
W98Polonia Obs. in Chile, 1 in MPEC 2017-L03 -- P/2017 K3
W25RMS Obs., 4 in MPEC 2017-L01 -- 2017 KW31, 2017 KS4, 2017 KR27, 2017 KF3
G39ROAD in Chile, 1 in MPEC 2017-L06 -- C/2017 K6
G403Tony Evans in Portugal via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-L01 -- 2017 CS
W883B. Lutkenhoner in Germany via Slooh.com Chile Obs. in Chile, 2 in MPECs 2017-L04 & 2017-L06 -- C/2017 K6, C/2017 K4
Y00SONEAR in Brazil, 7 in MPECs 2017-L01, 2017-L03, 2017-L04 & 2017-L06 -- C/2017 K6, C/2017 K4, P/2017 K3, 2017 HN49, 481532, 138846, 1980
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-L05 -- C/2017 K5
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-L03 -- P/2017 K3
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2017-L03 -- P/2017 K3
926Tenagra II Obs. in Arizona, 1 in MPEC 2017-L03 -- P/2017 K3
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-L01 -- 2017 JB2
Z92West Park Obs. in England, 1 in MPEC 2017-L01 -- 2017 CS
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 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 KJ32NEODyS15302078-210764.54e-08-9.65-10.020NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2017-05-29.279 to 2017-05-30.478."
2017 KQ27JPL Sentry23082117-211711.114e-06-6.67-6.670JPL: Computed at 16:00 today Pacific time based on 29 observations spanning 6.1743 days (2017-May-25.30459 to 2017-May-31.47886). Diameter approximately 0.023 km. from weighted mean H=25.81.
NEODyS15302080-211739.82e-07-6.70-6.710NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2017-05-25.305 to 2017-05-29.393."
2017 JB2JPL Sentry15302110-211129.655e-07-8.48-8.760JPL: Computed at 08:00 today Pacific time based on 30 observations spanning 23.026 days (2017-May-06.44444 to 2017-May-29.470678). Diameter approximately 0.005 km. from weighted mean H=29.07.
2017 HJ61NEODyS15302026-204951.08e-05-6.12-6.20NEODyS: "Based on 6 optical observations (of which 0 are rejected as outliers) from 2017-04-27.419 to 2017-04-28.396."
2016 NL56NEODyS15302020-2116232.52e-08-4.05-4.110NEODyS: "Based on 6 optical observations (of which 0 are rejected as outliers) from 2016-07-12.445 to 2016-07-15.227."
1991 VGJPL Sentry1953R E M O V E DJPL: Risk listing removed at 1935 UTC today.

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 1 June '17

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

2308Noted that JPL Sentry has reposted 2017 KQ27 as an impact risk - see above
1953Noted that JPL Sentry has removed 1991 VG as an impact risk - see above
1852Generated Traffic Report
1800Grabbed MPEC 2017-L04 - Comet C/2017 K4 (ATLAS) - see above
Grabbed MPEC 2017-L05 - Comet C/2017 K5 (Panstarrs) - see above
Grabbed MPEC 2017-L06 - Comet C/2017 K6 (Jacques) - see above
1704Grabbed MPEC 2017-L03 - Comet P/2017 K3 (Gasparovic) - see above
1600Grabbed MPEC 2017-L02 - 1991 VG - see above
1530Noted that NEODyS has updated its 2016 NL56 risk assessment - see above
Noted that NEODyS has posted 2017 HJ61 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 JB2 risk assessment - see above
Noted that NEODyS has posted 2017 KJ32 as an impact risk - see above
Noted that NEODyS has updated its 2017 KQ27 risk assessment - see above
Grabbed MPEC 2017-L01 - Daily Orbit Update - see above