Contents  on 11 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 11 May '17

Seven objects reported inside ten LD

Today seven visitors are reported moving within ten lunar distances (LD) of Earth. Nearest are 2017 JA2, inbound from 4.17 to 2.81 LD, and risk-listed 2017 JX1, which comes its closest to our planet on this passage, reaching 3.71 LD at 0249 UTC.

Earth passage I D ~Size Distance Today  Notes
0.14 LD May 42017 JB2 5 m  4.81 to 5.48 LD intruder, risk
2.34 LD May 82017 JV1 20 m  5.85 to 8.22 LD
2.57 LD tomorrow2017 JA2 41 m  2.81 from 4.17 LD DOU
3.70 LD May 82017 HX4 18 m  7.66 to 10.09 LD exits ten LD
3.71 LD today2017 JX1 21 m  3.71 LD risk, Earth closest at 0249 UTC
5.55 LD today2017 HU49 18 m  5.55 LD Earth closest at 2139 UTC
8.88 LD May 92017 JY1 31 m  9.31 to 10.02 LD exits ten LD
5.09 LD May 152017 JM2 50 m  < 10 LD tomorrow
7.93 LD May 292017 CS 446 m  < 10 LD May 26, radar target - DOU

This report was generated at 1836 UTC with follow-up in today's DOU MPEC for 2017 JA2 and 2017 CS along with astrometry from February for NHATS target 2017 DA36.

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 11 May '17

The MPC's NEO Confirmation Page has 24 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 24 objects listed. Of these, eleven 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 11 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 11 May '17 >>  MPEC 2017-J66 - "12:03 UT" - Daily Orbit Update

Observers  on 11 May '17

Twelve observers appear in today's MPEC.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 2 in MPEC 2017-J66 -- 2017 CS, 1036
G36CASADO in Spain, 1 in MPEC 2017-J66 -- 1917
J95Great Shefford Obs. in England, 1 in MPEC 2017-J66 -- 2017 JA2
168Kourovskaya Obs. in Russia, 1 in MPEC 2017-J66 -- 143404
Z43Landehen Obs., 2 in MPEC 2017-J66 -- 90075, 11398
C47Nonndorf Obs. in Austria, 1 in MPEC 2017-J66 -- 2017 JA2
J69North Obs. in England, 1 in MPEC 2017-J66 -- 2017 JA2
Z80Northolt Branch Obs. in England, 2 in MPEC 2017-J66 -- 475665, 190166
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2017-J66 -- 87024, 480984, 252793, 5604
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-J66 -- 2017 DA36
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-J66 -- 2017 GM7, 2017 FX64
718Wiggins Obs. in Utah, 1 in MPEC 2017-J66 -- 2017 JA2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 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 JX1NEODyS1544209117.96e-08-7.87-7.870NEODyS: "Based on 45 optical observations (of which 4 are rejected as outliers) from 2017-05-04.136 to 2017-05-10.038."

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 11 May '17

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

1836Generated Traffic Report
1544Noted that NEODyS has updated its 2017 JX1 risk assessment - see above
Grabbed MPEC 2017-J66 - Daily Orbit Update - see above