Contents  on 13 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 13 May '17

Five objects reported inside ten LD

Five objects are known to be flying within ten lunar distances (LD) of our planet today. Nearest of these is 2017 JA2, outbound from 2.77 to 4.10 LD.

Earth passage I D ~Size Distance Today  Notes
0.14 LD May 42017 JB2 5 m  6.14 to 6.80 LD intruder, risk
2.57 LD yesterday2017 JA2 38 m  2.77 to 4.10 LD DOU
3.71 LD May 112017 JX1 21 m  5.02 to 6.37 LD risk - DOU
5.09 LD May 152017 JM2 49 m  6.37 from 8.76 LD DOU
5.55 LD May 112017 HU49 18 m  5.57 to 5.62 LD DOU
7.93 LD May 292017 CS 446 m  < 10 LD May 26, radar target

This report was generated at 1825 UTC with follow-up in today's DOU MPEC for four objects in the active traffic table here as well as departed 2017 JY1 plus astrometry from April for 2017 HU3, 2017 FP128, 2017 FU64 and risk-listed intruder 2017 HJ.

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 13 May '17

The MPC's NEO Confirmation Page has 18 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eighteen objects listed. Of these, five were "one nighters." So far The Tracking News has counted a total of 22 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 13 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.

MPEC 2017-J69 - "13:06 UT" - 2016 LJ49

<< DOU on 13 May '17 >>  MPEC 2017-J68 - "12:03 UT" - Daily Orbit Update

Observers  on 13 May '17

Fourteen observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 1 in MPEC 2017-J68 -- 2017 JA2
H21Astronomical Research Obs. Westfield in Illinois, 14 in MPECs 2017-J68 & 2017-J69 -- 2017 HU, 2017 HT, 2017 HJ, 2017 HH, 2017 GQ6, 2017 GP6, 2017 FM128, 2017 FL90, 2017 FH90, 2017 FH128, 2017 FH101, 2016 LJ49, 136582, 11398
160Castelmartini Obs. in Italy, 13 in MPEC 2017-J68 -- 2017 FU64, 2017 FP128, 2017 DT37, 2017 AC5, 484795, 475665, 448003, 252091, 215588, 138359, 137158, 5604, 2329
734Farpoint Obs. in Kansas, 2 in MPEC 2017-J68 -- 2017 JW1, 2017 JU1
J95Great Shefford Obs. in England, 1 in MPEC 2017-J68 -- 2017 JX1
B49Paus Obs. in Spain, 1 in MPEC 2017-J68 -- 2017 JM2
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2017-J68 -- 488803, 456651
W25RMS Obs., 1 in MPEC 2017-J69 -- 2016 LJ49
204Schiaparelli Obs. in Italy, 16 in MPEC 2017-J68 -- 2017 JY1, 2017 JX1, 2017 HU3, 2017 HT3, 2017 HP3, 2017 HH, 2017 HC1, 2017 GU6, 2017 GT6, 2017 FE128, 2017 DS35, 2017 CG1, 2017 BU31, 2017 BJ92, 2016 YM1, 2016 XH2
Y00SONEAR in Brazil, 1 in MPEC 2017-J68 -- 1864
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-J68 -- 2017 GQ6
926Tenagra II Obs. in Arizona, 8 in MPECs 2017-J68 & 2017-J69 -- 2017 JR1, 2017 JM2, 2017 JA2, 2017 HU49, 2016 LJ49, 2011 JX1, 159560, 142561
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-J68 -- 2017 FN128, 2017 FD157
C51WISE in Earth polar orbit, 4 in MPEC 2017-J68 -- 66400, 66391, 488450, 486607
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 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 HJJPL Sentry16002070-2117243.9079e-06-6.71-7.560JPL: Computed at 08:05 today Pacific time based on 60 observations spanning 7.5571 days (2017-Apr-17.42568 to 2017-Apr-24.982772). Diameter approximately 0.011 km. from weighted mean H=27.46.

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 13 May '17

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

1825Generated Traffic Report
1600Noted that JPL Sentry has updated its 2017 HJ risk assessment - see above
Grabbed MPEC 2017-J68 - Daily Orbit Update - see above
Grabbed MPEC 2017-J69 - 2016 LJ49 - see above