Contents  on 23 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 23 May '17

One object reported inside ten LD

One transient natural object is known to be moving inside ten lunar distances (LD) of our home world today. 2017 HU49 is outbound from 7.09 to 7.33 LD. Up next, radar target 2017 CS comes inside ten LD on May 26th.

This report was generated at 1733 UTC with follow-up in today's DOU MPEC for 2017 CS and, from April, for dim NHATS target 2017 FB3, adding 22.11 days to its 11.93-day observation arc.

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 23 May '17

The MPC's NEO Confirmation Page has 73 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 73 objects listed. Of these, eighteen were "one nighters." So far The Tracking News has counted a total of 74 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 23 May '17

Minor Planet Electronic Circulars

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

<< DOU on 23 May '17 >>  MPEC 2017-K33 - "12:03 UT" - Daily Orbit Update

Observers  on 23 May '17

Eighteen observers appear in today's MPEC.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 6 in MPEC 2017-K33 -- 2017 KK3, 2017 KJ3, 2017 HS49, 2017 HM49, 2017 HJ49, 2014 RB13
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPEC 2017-K33 -- 2017 JK2, 2017 JH3, 2017 JE3, 2017 HV3, 2017 HL49, 2017 HH2, 2017 HA49, 2017 GS5, 2017 FW64, 2017 FM128, 2017 FH90, 2017 DB109, 2016 YF11, 2016 GH135, 2016 AH193
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2017-K33 -- 2017 JV2
703Catalina Sky Survey (CSS) in Arizona, 8 in MPEC 2017-K33 -- 475665, 456651, 222073, 190166, 154144, 136582, 100926, 1980
107Cavezzo Obs. in Italy, 5 in MPEC 2017-K33 -- 2017 CS, 2014 KF91, 2005 GL9, 252091, 222073
K89Digital Stargate Obs., 1 in MPEC 2017-K33 -- 405427
J27El Guijo Obs. in Spain, 1 in MPEC 2017-K33 -- 222073
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2017-K33 -- 2017 HZ4
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-K33 -- 4055
568_Marco Micheli on Mauna Kea in Hawaii, 2 in MPEC 2017-K33 -- 2017 KL3, 2017 KJ3
G96Mt. Lemmon Survey (MLS) in Arizona, 18 in MPEC 2017-K33 -- 2017 JW1, 2017 GB8, 2016 XH2, 2012 VO76, 2010 VZ71, 90373, 475665, 474425, 413002, 39565, 387505, 370688, 351815, 288592, 276891, 265032, 142781, 138404
Z80Northolt Branch Obs. in England, 2 in MPEC 2017-K33 -- 142561, 11398
F51Pan-STARRS 1 (PS1) in Hawaii, 11 in MPEC 2017-K33 -- 2017 JU2, 2017 JL3, 2017 GB8, 2017 FD65, 2016 LJ49, 2005 GL9, 488465, 468910, 185716, 100926, 4581
691Spacewatch 0.9m telescope in Arizona, 5 in MPEC 2017-K33 -- 2017 HX3, 2017 FP64, 2017 BL6, 2010 LQ33, 2009 WO106
291Spacewatch 1.8m telescope in Arizona, 10 in MPEC 2017-K33 -- 2017 KK3, 2017 KB3, 2017 JH3, 2017 HX3, 2017 HS, 2013 NZ23, 2010 NG1, 2010 GW62, 2010 GP67, 2004 KH15
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-K33 -- 142781
926Tenagra II Obs. in Arizona, 2 in MPEC 2017-K33 -- 2017 KC3, 2017 KB3
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-K33 -- 2017 FB3, 469219
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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.





Notes for Today's Latest Risk Assessments
2017 KB3JPL Sentry16322061-2110225.231413e-06-5.45-5.710JPL: Computed at 08:02 today Pacific time based on 15 observations spanning 6.0115 days (2017-May-17.21791 to 2017-May-23.22944). Diameter approximately 0.035 km. from weighted mean H=24.92.
2017 HZ4JPL Sentry16322082-2113115.5695359e-05-5.03-5.040JPL: Computed at 08:10 today Pacific time based on 44 observations spanning 26.482 days (2017-Apr-26.44436 to 2017-May-22.926371). Diameter approximately 0.023 km. from weighted mean H=25.89.
2010 GZ60JPL Sentry16322017-21164805.4242289e-06-0.80-1.750JPL: Computed at 13:26 April 18th Pacific time based on 14 observations spanning 1.2571 days (2010-Apr-05.71913 to 2010-Apr-06.97621). Diameter approximately 2.000 km. from weighted mean H=16.14.

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 May '17

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

1733Generated Traffic Report
1632Noted that JPL Sentry has updated its 2010 GZ60 risk assessment - see above
Noted that JPL Sentry has updated its 2017 HZ4 risk assessment - see above
Noted that JPL Sentry has updated its 2017 KB3 risk assessment - see above
Grabbed MPEC 2017-K33 - Daily Orbit Update - see above