Contents  on 27 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 27 May '17

Four objects reported inside ten LD

There are four visitors known today to be inside a radius of ten lunar distances (LD) from our home world. Radar target 2017 CS is inbound from 9.61 to 8.62 LD while the other three are all outbound: risk-listed 2017 KH5 from 4.59 to 7.83 LD, 2017 KW4 from 5.54 to 7.89 LD, and 2017 HU49 from 8.11 to 8.38 LD. Coming into the the neighborhood next, radar target 418094 2007 WV4 enters ten LD on May 31st.

This report was generated at 1910 UTC with follow-up in today's DOU MPEC for 2017 CS, and we have added 418094 2007 WV4 to this reporting. It is estimated to be a bit larger than 450 meters across and will pass us at 7.96 LD on June 1st (see radar planning).



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 27 May '17

The MPC's NEO Confirmation Page has 62 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 62 objects listed. Of these, 33 were "one nighters." The Tracking News counted a total of 78 listings on the NEOCP on this day.

New MPECs  on 27 May '17

Minor Planet Electronic Circulars

There were nine MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-K69 - "23:56 UT" - 2017 KQ27


MPEC 2017-K68 - "23:54 UT" - 2017 KP27


MPEC 2017-K67 - "23:51 UT" - 2017 KO27


MPEC 2017-K66 - "23:47 UT" - 2017 KN27


MPEC 2017-K65 - "23:44 UT" - 2017 KM27


MPEC 2017-K64 - "23:40 UT" - 2017 KL27


MPEC 2017-K63 - "23:36 UT" - 2017 KK27


MPEC 2017-K62 - "14:52 UT" - P/2016 P2 = 1998 U8 = 2007 R11 (Wiegert-Panstarrs)


<< DOU on 27 May '17 >>  MPEC 2017-K61 - "12:02 UT" - Daily Orbit Update

Observers  on 27 May '17

A total of 32 observers appeared in this day's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 3 in MPECs 2017-K63, 2017-K66 & 2017-K67 -- 2017 KO27, 2017 KN27, 2017 KK27
T05ATLAS Haleakala in Hawaii, 2 in MPEC 2017-K61 -- 2015 PQ291, 480934
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-K61 -- 2017 CS
703Catalina Sky Survey (CSS) in Arizona, 7 in MPEC 2017-K61 -- 2017 HY50, 2017 HW48, 2011 ED78, 68950, 481532, 276468, 7888
107Cavezzo Obs. in Italy, 2 in MPEC 2017-K61 -- 2017 CS, 2005 GL9
958Dax Obs. in France, 1 in MPEC 2017-K66 -- 2017 KN27
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 8 in MPECs 2017-K61, 2017-K63, 2017-K64, 2017-K65, 2017-K66, 2017-K67, 2017-K68 & 2017-K69 -- 2017 KQ27, 2017 KP27, 2017 KO27, 2017 KN27, 2017 KM27, 2017 KL27, 2017 KK27, 2017 HQ49
151Eschenberg Obs. in Switzerland, 4 in MPEC 2017-K61 -- 2017 HY50, 2012 VO76, 2005 MO13, 2005 GL9
203GiaGa Obs. in Italy, 1 in MPEC 2017-K61 -- 2017 HY50
J95Great Shefford Obs. in England, 3 in MPECs 2017-K63, 2017-K66 & 2017-K67 -- 2017 KO27, 2017 KN27, 2017 KK27
A17Guidestar Obs. in Germany, 2 in MPEC 2017-K61 -- 2017 KJ3, 2017 DS35
699LONEOS in Arizona, 1 in MPEC 2017-K62 -- P/1998 U8
130Lumezzane Obs. in Italy, 10 in MPEC 2017-K61 -- 2017 HY50, 2016 LJ49, 2015 ME54, 2005 MO13, 2005 GL9, 488465, 484517, 276468, 162452, 100926
H01Magdalena Ridge Obs. (MRO) in New Mexico, 7 in MPECs 2017-K63, 2017-K64, 2017-K65, 2017-K66, 2017-K67, 2017-K68 & 2017-K69 -- 2017 KQ27, 2017 KP27, 2017 KO27, 2017 KN27, 2017 KM27, 2017 KL27, 2017 KK27
W92MASTER OAFA Obs., 3 in MPEC 2017-K61 -- 427643, 3552, 3199
568*Paul Wiegert on Mauna Kea in Hawaii, 1 in MPEC 2017-K62 -- P/2007 R11
568_Marco Micheli on Mauna Kea in Hawaii, 3 in MPECs 2017-K64, 2017-K65 & 2017-K69 -- 2017 KQ27, 2017 KM27, 2017 KL27
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2017-K61, 2017-K63, 2017-K66 & 2017-K67 -- 2017 KT4, 2017 KO27, 2017 KN27, 2017 KK27, 2017 GM7, 2016 XQ23, 2012 HN8, 242191, 4179, 1916
J69North Obs. in England, 1 in MPEC 2017-K61 -- 2017 CS
Z80Northolt Branch Obs. in England, 4 in MPEC 2017-K61 -- 2017 HY50, 2011 ED78, 54789, 6063
C23Olmen Obs. in Belgium, 1 in MPEC 2017-K61 -- 66391
F51Pan-STARRS 1 (PS1) in Hawaii, 14 in MPECs 2017-K61, 2017-K64, 2017-K65, 2017-K67, 2017-K68 & 2017-K69 -- 2017 KQ27, 2017 KP27, 2017 KO27, 2017 KM27, 2017 KL27, 2017 KJ5, 2017 KE5, 2017 HQ49, 2017 HN3, 2017 GO7, 434734, 333908, 331769, 4596
W25RMS Obs., 1 in MPEC 2017-K66 -- 2017 KN27
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2017-K67 -- 2017 KO27
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-K61 -- 2017 JL3
Y00SONEAR in Brazil, 1 in MPEC 2017-K61 -- 2005 GL9
691Spacewatch 0.9m telescope in Arizona, 6 in MPEC 2017-K61 -- 2017 KZ4, 2017 KK3, 2017 KF3, 2017 KE3, 2014 NA64, 4055
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2017-K61 & 2017-K68 -- 2017 KP27, 2017 KJ5, 154590
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2017-K66 & 2017-K67 -- 2017 KO27, 2017 KN27
I52Steward Obs. Mt. Lemmon Station in Arizona, 12 in MPECs 2017-K61, 2017-K63, 2017-K66 & 2017-K67 -- 2017 KZ4, 2017 KV4, 2017 KQ4, 2017 KO27, 2017 KN27, 2017 KK27, 2017 KG5, 2017 KF5, 2017 KC3, 2017 HW48, 2017 HU4, 2016 XQ23
926Tenagra II Obs. in Arizona, 2 in MPECs 2017-K65 & 2017-K66 -- 2017 KN27, 2017 KM27
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-K61 -- 2017 HZ4, 364136
K17Valentines Obs., 2 in MPEC 2017-K61 -- 2017 CS, 100926
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 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 HZ4JPL Sentry16082082-2110120.000123679261-4.68-4.690JPL: Computed at 08:10 today Pacific time based on 46 observations spanning 28.935 days (2017-Apr-26.44436 to 2017-May-25.378868). Diameter approximately 0.023 km. from weighted mean H=25.88.

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 27 May '17

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

2358Grabbed MPEC 2017-K63 - 2017 KK27 - see above
Grabbed MPEC 2017-K64 - 2017 KL27 - see above
Grabbed MPEC 2017-K65 - 2017 KM27 - see above
Grabbed MPEC 2017-K66 - 2017 KN27 - see above
Grabbed MPEC 2017-K67 - 2017 KO27 - see above
Grabbed MPEC 2017-K68 - 2017 KP27 - see above
Grabbed MPEC 2017-K69 - 2017 KQ27 - see above
1910Generated Traffic Report
1608Noted that JPL Sentry has updated its 2017 HZ4 risk assessment - see above
Grabbed MPEC 2017-K61 - Daily Orbit Update - see above
Grabbed MPEC 2017-K62 - P/2016 P2 = 1998 U8 = 2007 R11 (Wiegert-Panstarrs) - see above