Contents  on 9 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 9 May '17

Six objects reported inside ten LD

Today there are six asteroids reported to be within ten lunar distances (LD) of our planet. Nearest is 2017 JV1, which exits Earth's SOI, moving out from 2.36 to 3.67 LD.

Earth passage I D ~Size Distance Today  Notes
2.34 LD yesterday2017 JV1 20 m  2.36 to 3.67 LD exits Earth SOI
2.57 LD May 122017 JA2 40 m  6.01 from 8.02 LD DOU
3.70 LD yesterday2017 HX4 18 m  3.94 to 5.47 LD
3.71 LD May 112017 JX1 22 m  4.22 from 5.32 LD risk, DOU
5.55 LD May 112017 HU49 18 m  5.61 from 5.68 LD DOU
8.88 LD today2017 JY1 31 m  8.88 LD Earth closest at 1122 UTC
7.93 LD May 292017 CS 446 m  < 10 LD May 26, radar target - DOU

This report was generated at 1811 UTC with follow-up in today's DOU MPEC for four objects, all in the active traffic table here.

Note:  We were unable to upload files to this Web site for most of the past 24 hours and we apologize for the delay in posting news 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 9 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."

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 9 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 9 May '17 >>  MPEC 2017-J56 - "12:22 UT" - Daily Orbit Update

Observers  on 9 May '17

Sixteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2017-J56 -- 2017 HV3, 2017 HM49, 2017 HA49, 2017 FW64, 2017 FR2, 2017 DB109, 276049
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2017-J56 -- 4055, 1627, 887
T08ATLAS Mauna Loa in Hawaii, 9 in MPEC 2017-J56 -- 2005 GL9, 480934, 475665, 474179, 252091, 222073, 1980, 1917, 1864
160Castelmartini Obs. in Italy, 2 in MPEC 2017-J56 -- 143637, 143624
970Chelmsford Obs. in England, 1 in MPEC 2017-J56 -- 2017 JA2
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-J56 -- 2017 JA2
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-J56 -- 86667
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-J56 -- 2017 JA2
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 2 in MPEC 2017-J56 -- 137078, 1980
W19Kalamazoo Obs. in Michigan, 1 in MPEC 2017-J56 -- 90075
Z80Northolt Branch Obs. in England, 4 in MPEC 2017-J56 -- 90075, 222073, 11398, 2329
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2017-J56 -- 139289, 5604, 5324, 3552
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 8 in MPEC 2017-J56 -- 2017 CS, 90075, 54789, 260141, 252091, 5604, 3352, 887
W25RMS Obs., 10 in MPEC 2017-J56 -- 2017 JX1, 2017 JA2, 2017 HY49, 2017 HU49, 2017 HP3, 2016 WO1, 276468, 260141, 159560, 142561
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-J56 -- 2017 JA2
Y00SONEAR in Brazil, 1 in MPEC 2017-J56 -- 3122
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-J56 -- 2017 GK4
C51WISE in Earth polar orbit, 8 in MPEC 2017-J56 -- 2013 AP60, 66400, 484517, 252091, 20460, 164121, 141670, 106589
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 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 Sentry16002091-209112.877e-07-7.29-7.290JPL: Computed at 07:50 today Pacific time based on 38 observations spanning 3.9803 days (2017-May-04.13562 to 2017-May-08.11591). Diameter approximately 0.022 km. from weighted mean H=25.97.
2009 VZ39JPL Sentry16002017-21169177.207438e-06-6.05-7.060JPL: Computed at 11:17 April 7th Pacific time based on 8 observations spanning .04342 days (2009-Nov-10.27204 to 2009-Nov-10.31546). Diameter approximately 0.009 km. from weighted mean H=27.88.

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 9 May '17

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

1811Generated Traffic Report
1600Noted that JPL Sentry has updated its 2009 VZ39 risk assessment - see above
Noted that JPL Sentry has updated its 2017 JX1 risk assessment - see above
Grabbed MPEC 2017-J56 - Daily Orbit Update - see above