Contents  on 1 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 1 May '17

Four objects reported inside ten LD

There are four asteroidal objects reported traveling inside ten lunar distances (LD) of our home planet today. None are particularly close and all are outbound. The nearest, 2017 HU3, moves away from 6.38 to 7.21 LD.

Earth passage I D ~Size Distance Today  Notes
0.61 LD April 222017 HG4 10 m  7.21 to 8.01 LD intruder, risk
3.17 LD April 202017 HU2 23 m  9.65 to 10.50 LD exits ten LD - DOU
6.12 LD April 302017 HU3 29 m  6.38 to 7.21 LD DOU
9.79 LD today2017 HA5 12 m  9.79 LD Earth closest at 1702 UTC
3.70 LD May 82017 HX4 17 m  < 10 LD May 5 - DOU
7.93 LD May 292017 CS 446 m  < 10 LD May 26, radar target - DOU

This report was generated at 1940 UTC with follow-up in today's DOU MPEC for four objects active in the traffic table here plus departed objects 2017 FO101 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 1 May '17

The MPC's NEO Confirmation Page has 49 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 49 objects listed. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 58 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 1 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 1 May '17 >>  MPEC 2017-J02 - "11:59 UT" - Daily Orbit Update

MPEC 2017-J01 - "10:45 UT" - 2014 PR62

Observers  on 1 May '17

Fourteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2017-J02 -- 2017 GK4, 2017 FX64, 2017 FP64, 2017 FO101, 2017 FM128, 2017 FG3, 2017 DR36, 2017 DO36, 2017 DB36, 65706
703Catalina Sky Survey (CSS) in Arizona, 8 in MPEC 2017-J02 -- 2017 DS35, 2016 JP, 2010 JH88, 474179, 260141, 250614, 3103, 2329
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPECs 2017-J01 & 2017-J02 -- 2017 HW4, 2017 HU2, 2017 HT, 2017 HJ1, 2017 FL102, 2017 FG128, 2017 ED4, 2017 BL6, 2016 VY5, 2016 RO1, 2014 PR62
K65Cesena Obs. in Italy, 1 in MPEC 2017-J02 -- 2017 GB8
K89Digital Stargate Obs., 1 in MPEC 2017-J02 -- 2017 AC5
G48Harlingten Research Obs. in New Mexico, 1 in MPEC 2017-J02 -- 2014 JO25
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-J02 -- 475665
G96Mt. Lemmon Survey (MLS) in Arizona, 23 in MPEC 2017-J02 -- 2017 HV4, 2017 HN3, 2017 GT5, 2017 GB8, 2017 ES22, 2014 MK27, 2012 HN13, 2012 EY11, 2006 UM, 2000 UW13, 427643, 409256, 405427, 39565, 370688, 249595, 240320, 215588, 159560, 138404, 138359, 5324, 719
C23Olmen Obs. in Belgium, 1 in MPEC 2017-J02 -- 2014 JO25
322Perth Obs. MCT in Western Australia, 1 in MPEC 2017-J02 -- 2014 JO25
691Spacewatch 0.9m telescope in Arizona, 10 in MPEC 2017-J02 -- 2017 HZ4, 2017 HX4, 2017 GQ4, 2017 FK128, 2017 CS, 2014 JG78, 2012 HN13, 413002, 370307, 276891
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-J02 -- 2006 UM
926Tenagra II Obs. in Arizona, 15 in MPEC 2017-J02 -- 2017 HU3, 2017 HU2, 2017 HT3, 2017 HP3, 2017 HK1, 2017 GW6, 2017 GU6, 2017 GT5, 2017 GB8, 2017 FP64, 2017 FL90, 2017 FJ90, 2017 FH101, 2016 XH2, 2016 TA56
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-J02 -- 2017 HU2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 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 HZ4JPL Sentry16332049-2110185.31398922e-05-5.05-5.420JPL: Computed at 08:18 today Pacific time based on 18 observations spanning 4.8809 days (2017-Apr-26.44436 to 2017-May-01.32524). Diameter approximately 0.022 km. from weighted mean H=25.89.
2017 HG4JPL Sentry19002048-2115222.852463e-05-6.03-6.730JPL: Computed at 10:31 today Pacific time based on 27 observations spanning 2.9717 days (2017-Apr-26.26272 to 2017-Apr-29.234385). Diameter approximately 0.010 km. from weighted mean H=27.66.
NEODyS15452048-2117843.25e-05-6.01-6.870NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2017-04-26.264 to 2017-04-29.235."

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 1 May '17

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

1940Generated Traffic Report
1900Noted that JPL Sentry has updated its 2017 HG4 risk assessment - see above
1633Noted that JPL Sentry has updated its 2017 HZ4 risk assessment - see above
1545Noted that NEODyS has updated its 2017 HG4 risk assessment - see above
Grabbed MPEC 2017-J01 - 2014 PR62 - see above
Grabbed MPEC 2017-J02 - Daily Orbit Update - see above