Contents  on 23 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 23 June '17

Two objects reported inside ten LD

There are two asteroidal objects known to be less than ten lunar distances (LD) from us today. 2017 MF is outbound from 4.49 to 5.88 LD and radar target 441987 2010 NY65 is inbound from 8.69 to 7.93 LD.

Coming our way next, newly announced 2017 MC1 will arrive inside ten LD on June 27th and NHATS target 2017 BS5 enters on July 16th.

This report was generated at 2114 UTC with the discovery of 2017 MC1 (MPEC) and with follow-up in today's DOU MPEC for 2017 BS5 and for departed objects 2017 LD, radar targets 2017 CS and 418094 2007 WV4, and distant 484402 2007 XH16, plus observation of radar target 2014 JO25 from April.



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 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 23 June '17

Radar observation of two objects

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


Data update noted at 2320 UTC when the database was dated 23 June

NEOCP Activity  on 23 June '17

The MPC's NEO Confirmation Page has 64 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 64 objects listed. Of these, 41 were "one nighters." So far The Tracking News has counted a total of 86 listings on the NEOCP today.

New MPECs  on 23 June '17

Minor Planet Electronic Circulars

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


MPEC 2017-M52 - "16:11 UT" - 2017 MF1


MPEC 2017-M51 - "16:08 UT" - 2017 MD1


MPEC 2017-M50 - "16:05 UT" - 2017 ME1


MPEC 2017-M49 - "16:02 UT" - 2017 MC1


MPEC 2017-M48 - "15:58 UT" - 2017 MB1


MPEC 2017-M47 - "15:55 UT" - 2017 MA1


MPEC 2017-M46 - "15:51 UT" - 2017 MZ


MPEC 2017-M45 - "15:30 UT" - Comet C/2017 M4 (ATLAS)


MPEC 2017-M44 - "15:20 UT" - Comet C/2017 M3 (Panstarrs)


<< DOU on 23 June '17 >>  MPEC 2017-M43 - "12:00 UT" - Daily Orbit Update


MPEC 2017-M42 - "00:25 UT" - 2015 YC1

Observers  on 23 June '17

A total of 50 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 3 in MPECs 2017-M47, 2017-M48 & 2017-M49 -- 2017 MC1, 2017 MB1, 2017 MA1
251Arecibo in Puerto Rico, 2 in radar -- 418094, 6063
H21Astronomical Research Obs. Westfield in Illinois, 24 in MPECs 2017-M43, 2017-M46, 2017-M47 & 2017-M50 -- 2017 MZ, 2017 ME1, 2017 MA1, 2017 KS4, 2017 KL3, 2017 HY50, 2017 HW48, 2017 GQ6, 2017 CS, 2017 BS5, 2011 ED78, 495331, 275677, 265962, 222073, 190491, 190166, 162581, 11398, 100926, 7888, 4055, 2102, 1917
T05ATLAS Haleakala in Hawaii, 7 in MPEC 2017-M43 -- 54789, 491567, 484517, 416584, 154144, 152931, 2329
T08ATLAS Mauna Loa in Hawaii, 6 in MPECs 2017-M43 & 2017-M45 -- C/2017 M4, 2017 KR34, 2013 LB1, 480934, 136923, 4957
C77Bernezzo Obs. in Italy, 2 in MPECs 2017-M45 & 2017-M46 -- 2017 MZ, C/2017 M4
073Bucharest Obs. in Romania, 1 in MPEC 2017-M43 -- 190166
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2017-M45 -- C/2017 M4
160Castelmartini Obs. in Italy, 7 in MPECs 2017-M43, 2017-M46 & 2017-M47 -- 2017 MZ, 2017 MA1, 2011 ED78, 494706, 163696, 100926, 6063
703Catalina Sky Survey (CSS) in Arizona, 12 in MPECs 2017-M43 & 2017-M48 -- 2017 MB1, 2011 ED78, 484402, 190166, 142464, 12538, 100926, 5660, 4055, 3752, 3288, 1917
K65Cesena Obs. in Italy, 1 in MPEC 2017-M46 -- 2017 MZ
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2017-M48 -- 2017 MB1
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2017-M45 -- C/2017 M4
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 6 in MPECs 2017-M43, 2017-M49 & 2017-M50 -- 2017 ME1, 2017 MC1, 2017 MB, 2017 LU, 2017 KQ34, 2017 FU158
734Farpoint Obs. in Kansas, 3 in MPECs 2017-M46, 2017-M47 & 2017-M48 -- 2017 MZ, 2017 MB1, 2017 MA1
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-M46 -- 2017 MZ
203GiaGa Obs. in Italy, 1 in MPEC 2017-M46 -- 2017 MZ
K88GINOP-KHK in Hungary, 4 in MPECs 2017-M46, 2017-M47, 2017-M48 & 2017-M50 -- 2017 MZ, 2017 ME1, 2017 MB1, 2017 MA1
253Goldstone DSS-14 70m antenna in southern California, 2 in radar -- 418094, 6063
J95Great Shefford Obs. in England, 1 in MPEC 2017-M47 -- 2017 MA1
A17Guidestar Obs. in Germany, 1 in MPEC 2017-M46 -- 2017 MZ
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2017-M45 -- C/2017 M4
U69#program code "#" (12) via iTelescope Obs. Auberry in northern California, 1 in MPEC 2017-M45 -- C/2017 M4
U69)D. Brandt via iTelescope Obs. Auberry in northern California, 1 in MPEC 2017-M48 -- 2017 MB1
U695Hidetaka Sato in Japan via iTelescope Obs. Auberry in northern California, 1 in MPEC 2017-M45 -- C/2017 M4
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-M43 -- 413563
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 3 in MPECs 2017-M43, 2017-M47 & 2017-M48 -- 2017 MB1, 2017 MA1, 3122
K38M57 Obs. in Italy, 1 in MPEC 2017-M45 -- C/2017 M4
568_Marco Micheli on Mauna Kea in Hawaii, 6 in MPECs 2017-M43, 2017-M44, 2017-M49, 2017-M50, 2017-M51 & 2017-M52 -- 2017 MF1, 2017 ME1, 2017 MD1, 2017 MC1, C/2017 M3, 2017 KC36
900Moriyama Obs. in Japan, 1 in MPEC 2017-M47 -- 2017 MA1
474Mt. John Obs. in New Zealand, 2 in MPECs 2017-M47 & 2017-M48 -- 2017 MB1, 2017 MA1
G96Mt. Lemmon Survey (MLS) in Arizona, 13 in MPECs 2017-M43, 2017-M46, 2017-M47, 2017-M48 & 2017-M50 -- 2017 MZ, 2017 ME1, 2017 MB1, 2017 MA1, 2015 NW9, 2007 VR183, 2007 MT20, 89959, 456651, 275677, 159454, 7888, 5879
Z80Northolt Branch Obs. in England, 2 in MPECs 2017-M43 & 2017-M45 -- C/2017 M4, 6063
C23Olmen Obs. in Belgium, 1 in MPEC 2017-M45 -- C/2017 M4
F51Pan-STARRS 1 (PS1) in Hawaii, 16 in MPECs 2017-M43, 2017-M44, 2017-M45, 2017-M46, 2017-M49, 2017-M50, 2017-M51 & 2017-M52 -- 2017 MZ, 2017 MJ, 2017 MF1, 2017 ME1, 2017 MD1, 2017 MC1, C/2017 M4, C/2017 M3, 2017 KC36, 2012 HN8, 2008 EL6, 488640, 418094, 271480, 142040, 141447
K63Pascoli Obs. in Italy, 1 in MPEC 2017-M47 -- 2017 MA1
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 3 in MPECs 2017-M44, 2017-M46 & 2017-M50 -- 2017 MZ, 2017 ME1, C/2017 M3
W25RMS Obs., 1 in MPEC 2017-M46 -- 2017 MZ
L04ROASTERR-1 in Romania, 2 in MPECs 2017-M45 & 2017-M46 -- 2017 MZ, C/2017 M4
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2017-M45, 2017-M46 & 2017-M47 -- 2017 MZ, 2017 MA1, C/2017 M4
H36Sandlot Obs. in Kansas, 2 in MPECs 2017-M46 & 2017-M47 -- 2017 MZ, 2017 MA1
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2017-M46 -- 2017 MZ
204Schiaparelli Obs. in Italy, 4 in MPECs 2017-M45, 2017-M46, 2017-M47 & 2017-M48 -- 2017 MZ, 2017 MB1, 2017 MA1, C/2017 M4
Y00SONEAR in Brazil, 2 in MPECs 2017-M43 & 2017-M48 -- 2017 MB1, 2102
291Spacewatch 1.8m telescope in Arizona, 5 in MPECs 2017-M43, 2017-M44, 2017-M49, 2017-M50 & 2017-M51 -- 2017 ME1, 2017 MD1, 2017 MC1, C/2017 M3, 2017 LO1
I93St. Pardon de Conques Obs. in France, 4 in MPECs 2017-M46, 2017-M47, 2017-M48 & 2017-M50 -- 2017 MZ, 2017 ME1, 2017 MB1, 2017 MA1
I52Steward Obs. Mt. Lemmon Station in Arizona, 10 in MPECs 2017-M43, 2017-M44, 2017-M46, 2017-M47, 2017-M48, 2017-M49, 2017-M50, 2017-M51 & 2017-M52 -- 2017 MZ, 2017 MK, 2017 MF1, 2017 ME1, 2017 MD1, 2017 MC1, 2017 MB1, 2017 MA1, C/2017 M3, 2017 KQ34
461SZTE Asteroid Program in Hungary, 1 in MPEC 2017-M45 -- C/2017 M4
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2017-M45 -- C/2017 M4
926Tenagra II Obs. in Arizona, 1 in MPEC 2017-M47 -- 2017 MA1
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 2 in MPECs 2017-M42 & 2017-M43 -- 2017 LD, 2015 YC1
H78Univ. of Narino Obs. in Colombia, 1 in MPEC 2017-M43 -- 2014 JO25
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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 MB1JPL Sentry18362048-2117795.399666e-07-3.06-3.580JPL: Computed at 11:03 today Pacific time based on 73 observations spanning 4.0576 days (2017-Jun-19.31418 to 2017-Jun-23.371794). Diameter approximately 0.639 km. from weighted mean H=18.62.
2017 LUNEODyS1614205617.25e-06-1.97-1.971NEODyS: "Based on 51 optical observations (of which 0 are rejected as outliers) from 2017-06-08.757 to 2017-06-22.151."
JPL Sentry15072056-205617.763e-07-2.94-2.940JPL: Computed at 07:47 today Pacific time based on 51 observations spanning 13.394 days (2017-Jun-08.75606 to 2017-Jun-22.14982). Diameter approximately 0.670 km. from weighted mean H=18.51.
2017 LDJPL Sentry16142053-21173030.0019402108704-4.25-4.800JPL: Computed at 08:36 today Pacific time based on 96 observations spanning 36.315 days (2017-May-16.298488 to 2017-Jun-21.613599). Diameter approximately 0.010 km. from weighted mean H=27.55.
2017 KC36NEODyS16142037-205421.42e-06-6.64-6.640NEODyS: "Based on 5 optical observations (of which 0 are rejected as outliers) from 2017-05-30.495 to 2017-05-31.423."
JPL Sentry15072037-206136.4518e-07-7.27-7.320JPL: Computed at 07:50 today Pacific time based on 5 observations spanning .92772 days (2017-May-30.4941 to 2017-May-31.421823). Diameter approximately 0.011 km. from weighted mean H=27.42.
2015 YC1JPL Sentry0241R E M O V E DJPL: Risk listing removed at 0204 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 23 June '17

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

2320Noted Radar Astrometry database update - see above
2114Generated Traffic Report
1836Noted that JPL Sentry has posted 2017 MB1 as an impact risk - see above
1614Noted that NEODyS has posted 2017 KC36 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 LD risk assessment - see above
Noted that NEODyS has updated its 2017 LU risk assessment - see above
Grabbed MPEC 2017-M46 - 2017 MZ - see above
Grabbed MPEC 2017-M47 - 2017 MA1 - see above
Grabbed MPEC 2017-M48 - 2017 MB1 - see above
Grabbed MPEC 2017-M49 - 2017 MC1 - see above
Grabbed MPEC 2017-M50 - 2017 ME1 - see above
Grabbed MPEC 2017-M51 - 2017 MD1 - see above
Grabbed MPEC 2017-M52 - 2017 MF1 - see above
1534Grabbed MPEC 2017-M44 - Comet C/2017 M3 (Panstarrs) - see above
Grabbed MPEC 2017-M45 - Comet C/2017 M4 (ATLAS) - see above
1507Noted that JPL Sentry has posted 2017 KC36 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 LU risk assessment - see above
Grabbed MPEC 2017-M43 - Daily Orbit Update - see above
0241Noted that JPL Sentry has removed 2015 YC1 as an impact risk - see above
0041Grabbed MPEC 2017-M42 - 2015 YC1 - see above