Contents  on 5 May '18

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 5 May '18

Three objects reported inside ten LD

There are three asteroidal objects reported within ten lunar distances (LD) of Earth today, all of them calculated to be inbound yet further than eight LD from us.

Neighborhood Traffic
Earth passage I D ~Size Distance today  Inside ten LD Notes
6.2   LD May 8* 2016 JQ5 8 m  8.1 from 9.7 LD yesterday - May 11 Earth passage uncertainty +/- 14.00 hours*
6.48 LD May 9 388945 2008 TZ3 282 m  9.50 from 11.09 LD today - May 13 enters ten LD - DOU
9.65 LD May 7 1999 FN19 112 m  9.86 from 10.20 LD today - May 9 radar/NHATS target, enters ten LD - DOU
Approaching (sorted by 10-LD bubble entry date)
9.50 LD May 29 68347 2001 KB67 371 m  72.27 from 75.57 LD May 28 - 30 radar target
5.56 LD June 10 2018 EJ4 186 m  48.52 from 49.78 LD June 4 - 16 radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  34.42 from 35.19 LD June 6 - 15 NHATS target

This report was generated at 1950 UTC with the recovery of distant 2002 JR100 in today's DOU MPEC along with follow-up for approaching 2018 EJ4, inbound objects 388945 2008 TZ3 and 1999 FN19, and departed 2018 HM2. We also note for the record that the April 30th DOU belatedly announced four earlier discoveries, including intruder 2018 GR11, which went past Earth at about 0.7 LD on April 7th (+/- 44 minutes uncertainty). 2018 GU11 went by at 2.14 LD on April 14th, 2018 GS11 at 8.08 LD the day before that, and 2018 GT11 at 6.74 LD on April 9th.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting about transient natural objects that approach our planet's 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. "Distant" is used here to describe an object that has approached Earth within ten LD since A/CC began these traffic reports eleven years ago but is not currently coming so close. Object temporal distances are derived by A/CC from JPL Horizons data. "LD*" indicates some uncertainty in object passage time and distance. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 5 May '18

The MPC's NEO Confirmation Page has 18 listings

When last checked at 2324 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eighteen objects listed. Of these, four were "one nighters." So far The Tracking News has counted a total of 20 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 5 May '18

Minor Planet Electronic Circulars

As of last check at 2324 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 5 May '18 >>  MPEC 2018-J05 - "12:03 UT" - Daily Orbit Update

Observers  on 5 May '18

Nineteen observers appear in today's MPEC.

CodeObserver / observatory
160Castelmartini Obs. in Italy, 7 in MPEC 2018-J05 -- 36183, 25916, 212359, 184990, 15745, 14402, 115052
703Catalina Sky Survey (CSS) in Arizona, 21 in MPEC 2018-J05 -- 2018 HV2, 2018 GT1, 2018 FS3, 2017 VL15, 2016 JP, 2013 QH10, 2002 JR100, 517829, 516454, 475967, 474574, 411201, 285339, 276770, 152964, 138847, 11066, 9856, 8037, 3122, 1864
J95Great Shefford Obs. in England, 3 in MPEC 2018-J05 -- 2018 HV1, 2018 HR1, 2018 HM2
A17Guidestar Obs. in Germany, 6 in MPEC 2018-J05 -- 2018 GT1, 2018 GL1, 2018 EJ4, 2018 DB2, 2017 XH62, 2017 WH14
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-J05 -- 2002 JR100
711McDonald Obs. in Texas, 9 in MPEC 2018-J05 -- 2018 HU1, 2018 HQ1, 2018 GW4, 2018 GT1, 2018 GQ5, 2018 GM4, 2018 GL1, 2018 CK14, 2018 BL3
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPEC 2018-J05 -- 2014 YP15, 2014 OY1, 513550, 466508, 399611, 288807, 164121, 152931, 1866
J69North Obs. in England, 1 in MPEC 2018-J05 -- 388945
C23Olmen Obs. in Belgium, 1 in MPEC 2018-J05 -- 388945
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-J05 -- 337228
C95SATINO-1 in France, 1 in MPEC 2018-J05 -- 1999 AF4
G40!M. Kumrucu-Lohmiller in Massachusetts via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-J05 -- 1999 FN19
Y00SONEAR in Brazil, 2 in MPEC 2018-J05 -- 2013 US3, 444193
691Spacewatch 0.9m telescope in Arizona, 13 in MPEC 2018-J05 -- 2018 GS1, 2018 GR2, 2018 GJ1, 2018 GF4, 2018 FS3, 2018 FJ4, 2018 EE, 2016 CX264, 2015 FP118, 2011 KR12, 2001 SC170, 516803, 498548
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2018-J05 -- 2018 HJ2, 2018 GR4, 2017 VO15
I52Steward Obs. Mt. Lemmon Station in Arizona, 16 in MPEC 2018-J05 -- 2018 HU1, 2018 HQ1, 2018 HL2, 2018 HK, 2018 GX4, 2018 GW4, 2018 GT1, 2018 GQ5, 2018 GQ2, 2018 GL1, 2018 GG2, 2018 GA5, 2018 GA4, 2018 FS1, 2018 FB1, 2018 EM2
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-J05 -- 2017 BY32, 2017 BW30
C51WISE in Earth polar orbit, 2 in MPEC 2018-J05 -- 68950, 481032
E08Wobblesock Obs. in New South Wales, 6 in MPEC 2018-J05 -- 2018 HM2, 2018 HH2, 2018 FY1, 2018 FV4, 2018 FQ5, 2018 FN4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 May '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2324 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
2018 HJ2JPL Sentry15512085-208511.585e-04-3.60-3.600JPL: Computed at 08:00 today Pacific time based on 58 observations spanning 11.923 days (2018-Apr-23.41101 to 2018-May-05.33447). Diameter approximately 0.051 km. from weighted mean H=24.10.
2018 GR4JPL Sentry15512048-2113460.00032426297-4.67-5.000JPL: Computed at 08:09 today Pacific time based on 58 observations spanning 22.822 days (2018-Apr-12.31705 to 2018-May-05.13885). Diameter approximately 0.013 km. from weighted mean H=27.03.
2008 LEJPL Sentry15512020-21161212.3197952e-06-5.88-6.690JPL: Computed at 08:29 April 13th of 2017 Pacific time based on 12 observations spanning .14395 days (2008-Jun-02.29414 to 2008-Jun-02.43809). Diameter approximately 0.022 km. from weighted mean H=25.98.

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 5 May '18

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

1950Generated Traffic Report
1551Noted that JPL Sentry has updated its 2008 LE risk assessment - see above
Noted that JPL Sentry has updated its 2018 GR4 risk assessment - see above
Noted that JPL Sentry has updated its 2018 HJ2 risk assessment - see above
Grabbed MPEC 2018-J05 - Daily Orbit Update - see above