Contents  on 19 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 19 May '17

One object reported inside ten LD

There is one Solar-System small body known to be inside ten lunar distances (LD) of our home world today. 2017 HU49 is outbound from 6.24 to 6.43 LD. Approaching the neighborhood next, radar target 2017 CS comes inside ten LD on May 26th.

This report was generated at 1840 UTC with follow-up in today's DOU MPEC for 2017 CS and departed objects 2017 JP2 and radar target 2014 JO25.

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 19 May '17

The MPC's NEO Confirmation Page has 65 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 65 objects listed. Of these, 21 were "one nighters." So far The Tracking News has counted a total of 70 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 19 May '17

Minor Planet Electronic Circulars

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

<< DOU on 19 May '17 >>  MPEC 2017-K14 - "12:03 UT" - Daily Orbit Update

MPEC 2017-K13 - "11:36 UT" - Comet C/2016 T1 (Matheny)

Observers  on 19 May '17

Thirteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPEC 2017-K14 -- 2017 JW2, 2017 JW1, 2017 JV2, 2017 JU1, 2017 JL2, 2017 HW48, 2017 HN3, 2017 HK1, 2017 HH, 2017 HA1, 2017 GT5, 2017 FM128, 2017 FK128, 2017 FJ90, 2016 YU8, 2014 JO25, 351815
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2017-K14 -- 2017 GU6
160Castelmartini Obs. in Italy, 6 in MPEC 2017-K14 -- 2017 CS, 90075, 260141, 252091, 2329, 1036
703Catalina Sky Survey (CSS) in Arizona, 3 in MPEC 2017-K14 -- 488803, 484517, 11398
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-K13 -- C/2016 T1
K91LCOGT Sutherland A in South Africa, 1 in MPEC 2017-K14 -- 2005 MO13
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPEC 2017-K14 -- 2017 HW48, 474231, 275677, 25916, 190758, 7888, 7480
F51Pan-STARRS 1 (PS1) in Hawaii, 20 in MPECs 2017-K13 & 2017-K14 -- 2017 JW2, 2017 JV2, 2017 HK49, C/2016 T1, 2015 ME54, 2015 KN120, 2014 SO143, 2013 YY13, 2004 RN335, 48603, 474425, 456651, 411655, 269690, 250614, 243025, 159857, 142781, 141531, 4503
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2017-K14 -- 4055
691Spacewatch 0.9m telescope in Arizona, 3 in MPECs 2017-K13 & 2017-K14 -- C/2016 T1, 474231, 467460
926Tenagra II Obs. in Arizona, 9 in MPEC 2017-K14 -- 2017 JP2, 2017 JL3, 2017 JK2, 2017 JF3, 2017 HP49, 2017 GM7, 2016 JH12, 2014 HR184, 5879
W33Transit Dreams Obs., 2 in MPEC 2017-K14 -- 11398, 2329
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-K14 -- 2016 XH2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 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 JB2NEODyS15002100-210224.17e-08-9.77-9.770NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2017-05-06.445 to 2017-05-10.114."
2017 HZ4NEODyS15002068-2117356.17e-05-5.03-5.060NEODyS: "Based on 39 optical observations (of which 1 are rejected as outliers) from 2017-04-26.445 to 2017-05-14.116."
2017 HG4NEODyS15002047-2117871.22e-04-5.47-5.920NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2017-04-26.264 to 2017-05-03.363."

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 19 May '17

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

1840Generated Traffic Report
1500Noted that NEODyS has updated its 2017 HG4 risk assessment - see above
Noted that NEODyS has updated its 2017 HZ4 risk assessment - see above
Noted that NEODyS has updated its 2017 JB2 risk assessment - see above
Grabbed MPEC 2017-K13 - Comet C/2016 T1 (Matheny) - see above
Grabbed MPEC 2017-K14 - Daily Orbit Update - see above