Contents  on 21 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 21 June '17

Two objects reported inside ten LD

Two asteroids are known to be within ten lunar distances (LD) of Earth today. 2017 MF leaves Earth's SOI, traveling from 1.83 to 3.12 LD and 2017 LV exits the ten-LD space, passing from 9.00 to 10.72 LD. On approach next, radar target 441987 2010 NY65 comes inside ten LD tomorrow and NHATS target 2017 BS5 enters on July 16th.

This report was generated at 1800 UTC with follow-up in today's DOU MPEC for 2017 MF and for departed objects 2017 MD and radar targets 2017 CS and 418094 2007 WV4, plus astrometry from March for radar target 2017 FV.



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.

Radar Astrometry  on 21 June '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 2358 UTC when the database was dated 21 June

NEOCP Activity  on 21 June '17

The MPC's NEO Confirmation Page has 28 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 28 objects listed. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 38 listings on the NEOCP today.

New MPECs  on 21 June '17

Minor Planet Electronic Circulars

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


<< DOU on 21 June '17 >>  MPEC 2017-M39 - "12:00 UT" - Daily Orbit Update


MPEC 2017-M38 - "10:43 UT" - Comet P/2010 A2 = 2017 B5 (LINEAR)


MPEC 2017-M37 - "02:31 UT" - 2017 ML


MPEC 2017-M36 - "02:28 UT" - 2017 MM


MPEC 2017-M35 - "02:24 UT" - 2017 MK


MPEC 2017-M34 - "02:22 UT" - 2017 MJ


MPEC 2017-M33 - "02:18 UT" - 2017 MH


MPEC 2017-M32 - "02:16 UT" - 2017 LQ1

Observers  on 21 June '17

A total of 40 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 5 in MPEC 2017-M39 -- 2017 MD, 2015 YR1, 2014 UU192, 2008 TB27, 2002 FT6
H21Astronomical Research Obs. Westfield in Illinois, 26 in MPECs 2017-M33, 2017-M34, 2017-M36, 2017-M37 & 2017-M39 -- 2017 MM, 2017 ML, 2017 MJ, 2017 MH, 2017 KL3, 2017 HY50, 2017 HW48, 2017 HV3, 2017 CS, 2015 FO124, 2014 LU14, 2013 PX6, 2006 HW50, 66391, 495331, 494706, 190166, 162581, 142561, 142040, 11398, 106589, 7888, 6063, 1980, 1917
T08ATLAS Mauna Loa in Hawaii, 10 in MPEC 2017-M39 -- 54789, 152931, 13651, 12538, 7888, 4055, 2329, 2102, 1980, 1917
Z84Calar Alto Schmidt in Spain, 2 in MPECs 2017-M33 & 2017-M34 -- 2017 MJ, 2017 MH
160Castelmartini Obs. in Italy, 13 in MPEC 2017-M39 -- 2017 MC, 2017 CS, 68950, 416584, 232368, 142561, 142040, 141670, 141056, 136818, 106589, 5660, 2102
107Cavezzo Obs. in Italy, 2 in MPEC 2017-M39 -- 329774, 190166
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPECs 2017-M32, 2017-M33 & 2017-M39 -- 2017 MH, 2017 LQ1, 2017 KV4, 2017 KV34, 2017 JL3, 2017 FT2
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2017-M33 -- 2017 MH
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2017-M39 -- 2017 MC
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 5 in MPECs 2017-M35 & 2017-M39 -- 2017 MK, 2017 MF, 2017 LU, 2017 LO1, 2014 MY26
006Fabra Obs. in Spain, 2 in MPEC 2017-M39 -- 190166, 2102
734Farpoint Obs. in Kansas, 4 in MPECs 2017-M33, 2017-M34, 2017-M36 & 2017-M37 -- 2017 MM, 2017 ML, 2017 MJ, 2017 MH
E10*program code "*" (19) via Faulkes Telescope South in New South Wales, 1 in MPEC 2017-M39 -- 2017 KR34
203GiaGa Obs. in Italy, 1 in MPEC 2017-M35 -- 2017 MK
K88GINOP-KHK in Hungary, 2 in MPECs 2017-M34 & 2017-M39 -- 2017 MJ, 2007 ML6
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2017 CS
J95Great Shefford Obs. in England, 4 in MPECs 2017-M33, 2017-M34, 2017-M35 & 2017-M37 -- 2017 ML, 2017 MK, 2017 MJ, 2017 MH
A17Guidestar Obs. in Germany, 1 in MPEC 2017-M39 -- 2017 MD
K78Iota Scorpii Obs., 3 in MPEC 2017-M39 -- 418094, 11398, 6063
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-M39 -- 2017 MC
Z22MASTER IAC Obs. in the Canary Islands, 2 in MPEC 2017-M39 -- 20460, 5751
W92MASTER OAFA Obs., 1 in MPEC 2017-M39 -- 154589
568Mauna Kea in Hawaii, 1 in MPEC 2017-M38 -- P/2017 B5
474Mt. John Obs. in New Zealand, 9 in MPECs 2017-M32, 2017-M36, 2017-M37 & 2017-M39 -- 2017 MM, 2017 ML, 2017 LW, 2017 LQ1, 2017 KE35, 2017 FK101, 2017 DX37, 2014 BR8, 2005 LW3
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2017-M33, 2017-M34, 2017-M35, 2017-M36, 2017-M37 & 2017-M39 -- 2017 MM, 2017 ML, 2017 MK, 2017 MJ, 2017 MH, 2015 KN120
Z80Northolt Branch Obs. in England, 3 in MPEC 2017-M39 -- 2017 MC, 66391, 190166
C23Olmen Obs. in Belgium, 1 in MPEC 2017-M39 -- 190166
F51Pan-STARRS 1 (PS1) in Hawaii, 12 in MPECs 2017-M32, 2017-M33, 2017-M34, 2017-M36 & 2017-M39 -- 2017 MM, 2017 MJ, 2017 MH, 2017 LQ1, 2017 FV, 2017 AF21, 2011 UU158, 456651, 348595, 339492, 307493, 136582
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2017-M39 -- 2017 HY50, 2011 ED78, 66391, 494706
W25RMS Obs., 1 in MPEC 2017-M39 -- 2017 MK
104San Marcello Pistoiese Obs. in Italy, 5 in MPECs 2017-M33, 2017-M34, 2017-M35, 2017-M36 & 2017-M37 -- 2017 MM, 2017 ML, 2017 MK, 2017 MJ, 2017 MH
G40"G. Gasparovic in Croatia via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-M39 -- 1995 LG
Y00SONEAR in Brazil, 2 in MPEC 2017-M39 -- 190166, 143992
587Sormano Obs. in Italy, 2 in MPECs 2017-M33 & 2017-M34 -- 2017 MJ, 2017 MH
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2017-M33 -- 2017 MH
291Spacewatch 1.8m telescope in Arizona, 13 in MPECs 2017-M34, 2017-M35, 2017-M36, 2017-M37 & 2017-M39 -- 2017 MM, 2017 ML, 2017 MK, 2017 MJ, 2017 LU, 2017 LO1, 2017 KZ4, 2017 HT2, 2017 FP64, 2017 EQ13, 2015 CX12, 2014 HQ132, 2007 MG
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2017-M33 & 2017-M34 -- 2017 MJ, 2017 MH
I52Steward Obs. Mt. Lemmon Station in Arizona, 18 in MPECs 2017-M33, 2017-M34, 2017-M35, 2017-M37 & 2017-M39 -- 2017 ML, 2017 MK, 2017 MJ, 2017 MH, 2017 MF, 2017 ME, 2017 MD, 2017 MC, 2017 LU, 2017 LF1, 2017 LE1, 2017 KY34, 2017 KV4, 2017 KT34, 2015 AQ45, 442559, 436771, 420210
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-M39 -- 2017 JU1, 2002 RP137
C51WISE in Earth polar orbit, 1 in MPEC 2017-M32 -- 2017 LQ1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 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 LO1NEODyS1420R E M O V E D-
2017 LUJPL Sentry15002056-205618.622e-07-2.90-2.900JPL: Computed at 07:47 today Pacific time based on 48 observations spanning 12.700 days (2017-Jun-08.75606 to 2017-Jun-21.45588). Diameter approximately 0.670 km. from weighted mean H=18.53.
NEODyS1500205616.52e-06-2.02-2.021NEODyS #2 for the day: "Based on 48 optical observations (of which 1 are rejected as outliers) from 2017-06-08.757 to 2017-06-21.457."
2017 KQ27NEODyS14202080-211731.17e-06-6.62-6.720NEODyS: "Based on 63 optical observations (of which 1 are rejected as outliers) from 2017-05-25.305 to 2017-06-05.173."
2017 HZ4NEODyS14202091-2112103.26e-05-5.25-5.270NEODyS: "Based on 50 optical observations (of which 1 are rejected as outliers) from 2017-04-26.445 to 2017-06-18.998."
2017 AF21JPL Sentry1500R E M O V E DJPL: Risk listing removed at 1450 UTC today.
NEODyS1420R E M O V E D-
2012 TC4NEODyS15002020-2116906.68e-05-4.96-5.740NEODyS: "Based on 314 optical observations (of which 0 are rejected as outliers) from 2012-10-04.468 to 2012-10-11.749."

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 21 June '17

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

2358Noted Radar Astrometry database update - see above
1800Generated Traffic Report
1500Noted that NEODyS has updated its 2012 TC4 risk assessment - see above
Noted that JPL Sentry has removed 2017 AF21 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 LU risk assessment - see above
Noted that NEODyS has updated its 2017 LU risk assessment - see above
1420Noted that NEODyS has removed 2017 AF21 as an impact risk - see above
Noted that NEODyS has updated its 2017 HZ4 risk assessment - see above
Noted that NEODyS has updated its 2017 KQ27 risk assessment - see above
Noted that NEODyS has removed 2017 LO1 as an impact risk - see above
Noted that NEODyS has updated its 2017 LU risk assessment - see above
Grabbed MPEC 2017-M38 - Comet P/2010 A2 = 2017 B5 (LINEAR) - see above
Grabbed MPEC 2017-M39 - Daily Orbit Update - see above
0238Grabbed MPEC 2017-M32 - 2017 LQ1 - see above
Grabbed MPEC 2017-M33 - 2017 MH - see above
Grabbed MPEC 2017-M34 - 2017 MJ - see above
Grabbed MPEC 2017-M35 - 2017 MK - see above
Grabbed MPEC 2017-M36 - 2017 MM - see above
Grabbed MPEC 2017-M37 - 2017 ML - see above