Contents  on 21 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 21 May '17

One object reported inside ten LD

One transient natural object is known to be less than ten lunar distances (LD) from our planet today. 2017 HU49 heads out from 6.64 to 6.86 LD. Coming around the Sun next, radar target 2017 CS enters our ten-LD traffic reporting "bubble" on May 26th.

This report was generated at 1743 UTC with the discoveries of two already departed objects: 2017 KG3 (MPEC), which passed us at 5.57 LD on May 13th, and 2017 KZ2 (MPEC), which flew by at 7.25 LD May 11th. Today's DOU MPEC has first follow-up for departed risk listed 2017 JG3 (5.10 days added to 1.92-day discovery arc) and continuing follow-up for 2017 CS.



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 21 May '17

The MPC's NEO Confirmation Page has 52 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 52 objects listed. Of these, 28 were "one nighters." So far The Tracking News has counted a total of 89 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 21 May '17

Minor Planet Electronic Circulars

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


MPEC 2017-K30 - "15:36 UT" - 2015 NW9


MPEC 2017-K29 - "15:34 UT" - 2014 UA192


<< DOU on 21 May '17 >>  MPEC 2017-K28 - "12:03 UT" - Daily Orbit Update


MPEC 2017-K27 - "04:15 UT" - 2017 KL3


MPEC 2017-K26 - "04:12 UT" - 2017 KJ3


MPEC 2017-K25 - "04:09 UT" - 2017 KZ2


MPEC 2017-K24 - "03:22 UT" - 2017 KK3


MPEC 2017-K23 - "03:19 UT" - 2017 KH3


MPEC 2017-K22 - "03:17 UT" - 2017 KG3


MPEC 2017-K21 - "03:14 UT" - 2017 KF3


MPEC 2017-K20 - "03:11 UT" - 2017 KE3


MPEC 2017-K19 - "03:08 UT" - 2017 KD3


MPEC 2017-K18 - "03:05 UT" - 2017 KC3


MPEC 2017-K17 - "03:02 UT" - 2017 KB3


MPEC 2017-K16 - "02:59 UT" - 2017 KA3

Observers  on 21 May '17

A total of 34 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 1 in MPEC 2017-K25 -- 2017 KZ2
E23Arcadia Obs. in New South Wales, 2 in MPECs 2017-K19 & 2017-K23 -- 2017 KH3, 2017 KD3
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2017-K21, 2017-K22 & 2017-K23 -- 2017 KH3, 2017 KG3, 2017 KF3
T05ATLAS Haleakala in Hawaii, 13 in MPEC 2017-K28 -- 2015 ME54, 2013 CL118, 2011 ED78, 90075, 483560, 456651, 252091, 222073, 163696, 4055, 3103, 2329, 887
B66Casasco Obs. in Italy, 2 in MPEC 2017-K28 -- 2017 CS, 2016 WO1
160Castelmartini Obs. in Italy, 8 in MPECs 2017-K19, 2017-K23 & 2017-K28 -- 2017 KH3, 2017 KD3, 260141, 252091, 163696, 5653, 3352, 2329
703Catalina Sky Survey (CSS) in Arizona, 11 in MPECs 2017-K22 & 2017-K28 -- 2017 KG3, 90075, 68950, 405427, 39796, 252091, 222073, 163696, 7888, 4055, 3352
G58Chabot Obs. in northern California, 1 in MPEC 2017-K26 -- 2017 KJ3
151Eschenberg Obs. in Switzerland, 2 in MPECs 2017-K22 & 2017-K23 -- 2017 KH3, 2017 KG3
734Farpoint Obs. in Kansas, 4 in MPECs 2017-K16, 2017-K18, 2017-K22 & 2017-K23 -- 2017 KH3, 2017 KG3, 2017 KC3, 2017 KA3
595Farra d'Isonzo Obs. in Italy, 3 in MPECs 2017-K19, 2017-K22 & 2017-K23 -- 2017 KH3, 2017 KG3, 2017 KD3
203GiaGa Obs. in Italy, 2 in MPECs 2017-K22 & 2017-K23 -- 2017 KH3, 2017 KG3
K88GINOP-KHK in Hungary, 3 in MPECs 2017-K18, 2017-K22 & 2017-K23 -- 2017 KH3, 2017 KG3, 2017 KC3
J95Great Shefford Obs. in England, 3 in MPECs 2017-K18, 2017-K19 & 2017-K23 -- 2017 KH3, 2017 KD3, 2017 KC3
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-K20 -- 2017 KE3
K95MASTER-II Sutherland in South Africa, 2 in MPEC 2017-K28 -- 2005 GL9, 1980
G96Mt. Lemmon Survey (MLS) in Arizona, 16 in MPECs 2017-K16, 2017-K17, 2017-K18, 2017-K19, 2017-K22, 2017-K23, 2017-K25 & 2017-K28 -- 2017 KZ2, 2017 KH3, 2017 KG3, 2017 KD3, 2017 KC3, 2017 KB3, 2017 KA3, 2017 FJ90, 2016 YU8, 89959, 486607, 294739, 241662, 159454, 136818, 2329
C47Nonndorf Obs. in Austria, 1 in MPEC 2017-K22 -- 2017 KG3
J69North Obs. in England, 1 in MPEC 2017-K23 -- 2017 KH3
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-K28 -- 190166
C23Olmen Obs. in Belgium, 1 in MPEC 2017-K28 -- 66391
F51Pan-STARRS 1 (PS1) in Hawaii, 10 in MPECs 2017-K18, 2017-K19, 2017-K20, 2017-K21, 2017-K24, 2017-K26, 2017-K27 & 2017-K28 -- 2017 KL3, 2017 KK3, 2017 KJ3, 2017 KF3, 2017 KE3, 2017 KD3, 2017 KC3, 483459, 420262, 9400
W98Polonia Obs. in Chile, 1 in MPEC 2017-K28 -- 162149
L04ROASTERR-1 in Romania, 1 in MPEC 2017-K22 -- 2017 KG3
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-K19 -- 2017 KD3
587Sormano Obs. in Italy, 1 in MPEC 2017-K25 -- 2017 KZ2
691Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2017-K16, 2017-K20, 2017-K26 & 2017-K28 -- 2017 KJ3, 2017 KE3, 2017 KA3, 2017 FP64, 142781
291Spacewatch 1.8m telescope in Arizona, 8 in MPECs 2017-K21, 2017-K24, 2017-K26, 2017-K27 & 2017-K28 -- 2017 KL3, 2017 KK3, 2017 KJ3, 2017 KF3, 2017 JG3, 2017 HZ4, 2017 ES22, 2014 UQ56
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2017-K19, 2017-K22 & 2017-K23 -- 2017 KH3, 2017 KG3, 2017 KD3
I52Steward Obs. Mt. Lemmon Station in Arizona, 13 in MPECs 2017-K16, 2017-K18, 2017-K19, 2017-K22, 2017-K23 & 2017-K28 -- 2017 KH3, 2017 KG3, 2017 KD3, 2017 KC3, 2017 KA3, 2017 JF3, 2017 JD3, 2017 HP49, 2017 GW6, 2017 FO90, 2016 VS5, 2008 KD6, 2007 ML6
J22Tacande Obs. in the Canary Islands, 2 in MPECs 2017-K19 & 2017-K22 -- 2017 KG3, 2017 KD3
926Tenagra II Obs. in Arizona, 15 in MPECs 2017-K16, 2017-K17, 2017-K18, 2017-K19, 2017-K20, 2017-K21, 2017-K22, 2017-K23, 2017-K25, 2017-K26, 2017-K27, 2017-K28, 2017-K29 & 2017-K30 -- 2017 KZ2, 2017 KL3, 2017 KJ3, 2017 KH3, 2017 KG3, 2017 KF3, 2017 KE3, 2017 KD3, 2017 KC3, 2017 KB3, 2017 KA3, 2017 JV2, 2015 NW9, 2014 UA192, 2014 HR184
K41Vegaquattro Obs. in Italy, 2 in MPECs 2017-K19 & 2017-K23 -- 2017 KH3, 2017 KD3
C51WISE in Earth polar orbit, 1 in MPEC 2017-K28 -- 68950
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 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 KB3JPL Sentry05312052-2114621.29976545e-05-4.82-5.090JPL: Computed at 22:03 May 20th Pacific time based on 10 observations spanning 2.9583 days (2017-May-17.21791 to 2017-May-20.17624). Diameter approximately 0.038 km. from weighted mean H=24.74.
2017 JG3JPL Sentry1550R E M O V E DJPL: Risk listing removed at 1448 UTC today.
2017 HZ4JPL Sentry15502082-2113149.861316e-05-4.81-4.820JPL: Computed at 08:10 today Pacific time based on 41 observations spanning 24.810 days (2017-Apr-26.44436 to 2017-May-21.25389). Diameter approximately 0.022 km. from weighted mean H=25.95.

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 May '17

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

1743Generated Traffic Report
1550Noted that JPL Sentry has updated its 2017 HZ4 risk assessment - see above
Noted that JPL Sentry has removed 2017 JG3 as an impact risk - see above
Grabbed MPEC 2017-K28 - Daily Orbit Update - see above
Grabbed MPEC 2017-K29 - 2014 UA192 - see above
Grabbed MPEC 2017-K30 - 2015 NW9 - see above
0531Noted that JPL Sentry has posted 2017 KB3 as an impact risk - see above
0500Grabbed MPEC 2017-K25 - 2017 KZ2 - see above
Grabbed MPEC 2017-K26 - 2017 KJ3 - see above
Grabbed MPEC 2017-K27 - 2017 KL3 - see above
0400Grabbed MPEC 2017-K16 - 2017 KA3 - see above
Grabbed MPEC 2017-K17 - 2017 KB3 - see above
Grabbed MPEC 2017-K18 - 2017 KC3 - see above
Grabbed MPEC 2017-K19 - 2017 KD3 - see above
Grabbed MPEC 2017-K20 - 2017 KE3 - see above
Grabbed MPEC 2017-K21 - 2017 KF3 - see above
Grabbed MPEC 2017-K22 - 2017 KG3 - see above
Grabbed MPEC 2017-K23 - 2017 KH3 - see above
Grabbed MPEC 2017-K24 - 2017 KK3 - see above