Contents  on 4 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 4 May '18

Two objects reported inside ten LD

For awhile today there will be no transient natural objects reported flying inside ten lunar distances (LD) of our home planet. First 2018 HM2 exits our ten-LD traffic reporting "bubble," then later (perhaps 18.35 hours later), unrecovered returning 2016 JQ5 arrives inside, calculated to come in from 11.6 to 9.7 LD*.

Neighborhood Traffic
Earth passage I D ~Size Distance today  Inside ten LD Notes
6.2   LD May 8* 2016 JQ5 8 m  9.7 from 11.6 LD today - May 11 Earth passage uncertainty +/- 14.00 hours*, enters ten LD
8.72 LD April 30 2018 HM2 62 m  9.94 to 10.73 LD April 27 - today NHATS target, exits ten LD - DOU
Approaching (sorted by 10-LD bubble entry date)
9.65 LD May 7 1999 FN19 112 m  10.20 from 10.67 LD tomorrow - May 9 radar/NHATS target - DOU
6.48 LD May 9 388945 2008 TZ3 282 m  11.09 from 12.81 LD tomorrow - May 13 DOU
9.50 LD May 29 68347 2001 KB67 371 m  75.57 from 78.90 LD May 28 - 30 radar target
5.56 LD June 10 2018 EJ4 186 m  49.78 from 51.04 LD June 4 - 16 radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  35.19 from 35.96 LD June 6 - 15 NHATS target

This report was generated at 1650 UTC with follow-up in today's DOU MPEC for approaching objects 2018 EJ4, 388945 2008 TZ3, and 1999 FN19, and for outbound 2018 HM2 and departed 2018 HU.



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. 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 4 May '18

The MPC's NEO Confirmation Page has 13 listings

When last checked at 2323 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had thirteen objects listed. Of these, five were "one nighters." So far The Tracking News has counted a total of fifteen 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 4 May '18

Minor Planet Electronic Circulars

As of last check at 2323 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 4 May '18 >>  MPEC 2018-J04 - "12:04 UT" - Daily Orbit Update

Observers  on 4 May '18

Fourteen observers appear in today's MPEC.

CodeObserver / observatory
160Castelmartini Obs. in Italy, 15 in MPEC 2018-J04 -- 2018 GY1, 2018 FQ5, 2018 BY2, 85628, 66251, 498548, 475967, 388945, 374851, 337084, 194126, 172034, 163243, 138847, 9856
703Catalina Sky Survey (CSS) in Arizona, 12 in MPEC 2018-J04 -- 2018 HV2, 2017 WH14, 2017 VL15, 1999 FN19, 463664, 285339, 220839, 164201, 164121, 152931, 6455, 1866
V16Dark Sky New Mexico Obs. in New Mexico, 1 in MPEC 2018-J04 -- 2013 US3
J95Great Shefford Obs. in England, 2 in MPEC 2018-J04 -- 2018 HR1, 2018 HM2
C41MASTER-II Kislovodsk in Russia, 1 in MPEC 2018-J04 -- 3752
G96Mt. Lemmon Survey (MLS) in Arizona, 12 in MPEC 2018-J04 -- 2018 EJ4, 513182, 505657, 466508, 417949, 337228, 185853, 174050, 164121, 163691, 101873, 6455
Z80Northolt Branch Obs. in England, 3 in MPEC 2018-J04 -- 2018 GR2, 2013 US3, 388945
D29Purple Mtn. Obs. Xuyi Station in China, 7 in MPEC 2018-J04 -- 2018 BY2, 53435, 474574, 25916, 8566, 8037, 1866
C95SATINO-1 in France, 2 in MPEC 2018-J04 -- 2017 SO17, 15745
Y00SONEAR in Brazil, 3 in MPEC 2018-J04 -- 2013 US3, 388945, 138847
691Spacewatch 0.9m telescope in Arizona, 14 in MPEC 2018-J04 -- 2018 HV2, 2018 HQ, 2018 GZ3, 2018 GY4, 2018 GS1, 2018 GR2, 2018 GJ2, 2018 GJ1, 2018 EQ4, 2018 DK3, 2016 CX264, 2011 KR12, 2005 JD46, 2001 SC170
291Spacewatch 1.8m telescope in Arizona, 11 in MPEC 2018-J04 -- 2018 HU, 2018 HR1, 2018 HO1, 2018 HJ2, 2018 HA1, 2018 GL, 2018 GF4, 2018 FH, 2018 EQ4, 2018 EE, 2017 VO15
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-J04 -- 444193
Z52The Studios Obs., 1 in MPEC 2018-J04 -- 138847
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 May '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2323 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2018 HJ2JPL Sentry15202085-208511.659e-04-3.58-3.580JPL: Computed at 07:33 today Pacific time based on 55 observations spanning 10.992 days (2018-Apr-23.41101 to 2018-May-04.40268). Diameter approximately 0.051 km. from weighted mean H=24.10.

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 4 May '18

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

1650Generated Traffic Report
1520Noted that JPL Sentry has updated its 2018 HJ2 risk assessment - see above
Grabbed MPEC 2018-J04 - Daily Orbit Update - see above