Contents  on 8 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 8 May '17

Seven objects reported inside ten LD

Seven Solar-System small bodies are known to be less than ten lunar distances (LD) from Earth today. The nearest, just inside Earth's SOI (gravitational sphere of influence), is 2017 JV1, which comes its closest to our planet this time around, reaching 2.34 LD at 2108 UTC.

Earth passage I D ~Size Distance Today  Notes
0.44 LD May 42017 JQ1 5 m  9.83 to 12.32 LD exits ten LD, intruder
2.34 LD today2017 JV1 20 m  2.34 LD enters Earth SOI, Earth closest at 2108 UTC - DOU
2.57 LD May 122017 JA2 39 m  8.02 from 10.09 LD enters ten LD - DOU
3.70 LD today2017 HX4 18 m  3.70 LD Earth closest at 1156 UTC
3.71 LD May 112017 JX1 22 m  5.32 from 6.73 LD risk, DOU
5.55 LD May 112017 HU49 18 m  5.68 from 5.78 LD
8.88 LD tomorrow2017 JY1 31 m  8.92 from 9.28 LD
7.93 LD May 292017 CS 446 m  < 10 LD May 26, radar target

This report was generated at 1741 UTC with follow-up in today's DOU MPEC for three objects, all in the active traffic table here.

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 8 May '17

The MPC's NEO Confirmation Page has 39 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 39 objects listed. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 40 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 8 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 8 May '17 >>  MPEC 2017-J55 - "12:10 UT" - Daily Orbit Update

MPEC 2017-J54 - "04:33 UT" - 2010 VT11

Observers  on 8 May '17

Fifteen observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 1 in MPEC 2017-J55 -- 2017 HA49
T08ATLAS Mauna Loa in Hawaii, 2 in MPEC 2017-J55 -- 260141, 2329
160Castelmartini Obs. in Italy, 24 in MPEC 2017-J55 -- 2011 ED78, 90075, 68950, 53319, 475665, 474179, 456651, 448003, 427643, 260141, 252091, 222073, 188174, 163696, 138359, 106589, 8176, 7888, 5626, 5604, 4055, 3103, 2329, 1917
J27El Guijo Obs. in Spain, 1 in MPEC 2017-J55 -- 2329
J95Great Shefford Obs. in England, 3 in MPEC 2017-J55 -- 2017 JX1, 2017 JV1, 2017 JA2
K38M57 Obs. in Italy, 1 in MPEC 2017-J55 -- 2017 JA2
J69North Obs. in England, 1 in MPEC 2017-J55 -- 2017 JV1
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2017-J55 -- 2016 WO1
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2017-J55 -- 2017 GQ6, 2016 YU8, 89959, 425713
Y00SONEAR in Brazil, 1 in MPEC 2017-J55 -- 1864
W34Squirrel Valley Obs. in North Carolina, 2 in MPEC 2017-J55 -- 90075, 10115
926Tenagra II Obs. in Arizona, 3 in MPEC 2017-J55 -- 2017 JX1, 2017 JV1, 2017 JA2
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-J54 -- 2010 VT11
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2017-J54 -- 2010 VT11
K41Vegaquattro Obs. in Italy, 1 in MPEC 2017-J55 -- 2016 WO1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 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 JX1JPL Sentry16312091-209112.963e-07-7.28-7.280JPL: Computed at 07:48 today Pacific time based on 36 observations spanning 3.7679 days (2017-May-04.13562 to 2017-May-07.903488). Diameter approximately 0.022 km. from weighted mean H=25.96.
2017 FW90JPL Sentry23042101-210337.416e-06-7.09-7.400JPL: Computed at 16:00 today Pacific time based on 82 observations spanning 32.004 days (2017-Mar-25.34512 to 2017-Apr-26.348764). Diameter approximately 0.008 km. from weighted mean H=28.15.
2012 XB112JPL Sentry2200R E M O V E DJPL: Risk listing removed at 2112 UTC today.

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 8 May '17

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

2304Noted that JPL Sentry has updated its 2017 FW90 risk assessment - see above
2200Noted that JPL Sentry has removed 2012 XB112 as an impact risk - see above
1741Generated Traffic Report
1631Noted that JPL Sentry has posted 2017 JX1 as an impact risk - see above
Grabbed MPEC 2017-J55 - Daily Orbit Update - see above
0531Grabbed MPEC 2017-J54 - 2010 VT11 - see above