Contents  on 24 June '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 24 June '18

Five objects reported inside ten LD

Five small celestial objects are reported inside ten lunar distances (LD) of Earth today. Nearest are risk-listed 2018 MC7, outbound from 6.86 to 7.97 LD, and risk-listed 2018 LR3, inbound from 7.74 to 7.24 LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 1.0, 2.41, 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
2.19 LD June 18 2018 MC7 23 m  6.86 to 7.97 LD June 9 - 26 NHATS target, risk - DOU
5.22 LD June 21 2018 LX5 30 m  7.89 to 10.02 LD June 18 - 24 exits ten LD
5.51 LD June 27 2018 MX4 14 m  7.41 from 8.71 LD yesterday - July 2 risk
6.02 LD June 29 2018 LR3 19 m  7.24 from 7.74 LD June 20 - July 8 NHATS target, risk
6.51 LD June 21 2018 LS5 16 m  7.81 to 9.08 LD June 18 - 25 risk - DOU
Approaching
2.8   LD July 4* 2018 MB7 60 m  24.6 from 27.1 LD June 30 - July 8 Earth passage uncertainty +/- 40 mins.*

This report was generated at 1842 UTC with follow-up in today's DOU MPEC for outbound risk-listed objects 2018 MC7 and 2018 LS5, and for departed objects 2015 DP155 and 68347 2001 KB67.



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. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 24 June '18

The MPC's NEO Confirmation Page has 29 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 29 objects listed. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 39 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 24 June '18

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 24 June '18 >>  MPEC 2018-M92 - "12:03 UT" - Daily Orbit Update


MPEC 2018-M91 - "02:05 UT" - 2017 WL1


MPEC 2018-M90 - "00:22 UT" - 2018 ME7


MPEC 2018-M89 - "00:19 UT" - 2018 MD7

Observers  on 24 June '18

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 4 in MPEC 2018-M92 -- 278327, 138847, 115052, 1580
T08ATLAS Mauna Loa in Hawaii, 11 in MPEC 2018-M92 -- 2011 GA62, 2005 MF5, 99799, 495829, 25916, 153957, 139345, 13553, 1627, 1036, 719
160Castelmartini Obs. in Italy, 8 in MPEC 2018-M92 -- 2017 YE5, 2011 GA62, 68950, 455550, 139345, 13553, 7889, 719
703Catalina Sky Survey (CSS) in Arizona, 21 in MPEC 2018-M92 -- 2018 EE, 2015 DP155, 2012 DG61, 2006 UF17, 2001 FA58, 66391, 54401, 53110, 517829, 516154, 515639, 515049, 469737, 439313, 37336, 259802, 16834, 153415, 140039, 138847, 1866
E94Gisborne Obs. in New Zealand, 1 in MPEC 2018-M92 -- 2011 GA62
J95Great Shefford Obs. in England, 1 in MPEC 2018-M90 -- 2018 ME7
G48Harlingten Research Obs. in New Mexico, 1 in MPEC 2018-M92 -- 2011 GA62
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-M92 -- 2018 MW6
K38M57 Obs. in Italy, 1 in MPEC 2018-M92 -- 2018 MY6
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2018-M89 & 2018-M90 -- 2018 ME7, 2018 MD7
G96Mt. Lemmon Survey (MLS) in Arizona, 29 in MPECs 2018-M89 & 2018-M92 -- 2018 MD7, 2018 KT, 2018 FS3, 2015 QM3, 68950, 66391, 66251, 52762, 474574, 465166, 436771, 435302, 397237, 345853, 337228, 285818, 248926, 24445, 214869, 212359, 204131, 185853, 162635, 162215, 152679, 136874, 4179, 3757, 1866
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-M92 -- 2009 XR2
F51Pan-STARRS 1 (PS1) in Hawaii, 12 in MPECs 2018-M90 & 2018-M92 -- 2018 MS6, 2018 ME7, 2018 LQ2, 2018 AP12, 2014 WL368, 2010 BB3, 2005 MF5, 65996, 445267, 31345, 180186, 7025
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2018-M90 -- 2018 ME7
D29Purple Mtn. Obs. Xuyi Station in China, 12 in MPEC 2018-M92 -- 2009 XR2, 89959, 68347, 66391, 53789, 438429, 21277, 163691, 15745, 140158, 138155, 4183
691Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2018-M90 & 2018-M92 -- 2018 ME7, 2018 LQ2, 2018 LP5, 2018 LO6, 2018 LM4, 2018 LC3, 253062
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2018-M92 -- 2018 MR5, 2018 MC7, 2005 NJ63, 2001 HA4
I52Steward Obs. Mt. Lemmon Station in Arizona, 27 in MPECs 2018-M89, 2018-M90 & 2018-M92 -- 2018 MY6, 2018 MX6, 2018 MU6, 2018 MS6, 2018 MQ5, 2018 MF5, 2018 ME7, 2018 MD7, 2018 MC7, 2018 MC5, 2018 LZ5, 2018 LW5, 2018 LS5, 2018 LP5, 2018 LO6, 2018 LM4, 2018 LG5, 2018 LC3, 2018 KF3, 2018 GT1, 2018 FU, 2018 FS3, 2018 EQ4, 2018 AP12, 2017 YE5, 2017 YC8, 2017 NK
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPECs 2018-M91 & 2018-M92 -- 2018 LF3, 2017 WL1
L01Visnjan Obs., 1 in MPEC 2018-M89 -- 2018 MD7
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 June '18

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.
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 MD7JPL Sentry02042044-2115671.71440467e-05-3.88-4.530JPL: Computed at 18:47 June 23rd Pacific time based on 17 observations spanning 2.5881 days (2018-Jun-21.38173 to 2018-Jun-23.96986). Diameter approximately 0.110 km. from weighted mean H=22.51.
2018 MC7JPL Sentry17322060-2109420.000463047226-3.86-3.930JPL: Computed at 07:25 today Pacific time based on 20 observations spanning 3.0085 days (2018-Jun-21.39443 to 2018-Jun-24.40297). Diameter approximately 0.023 km. from weighted mean H=25.82.
2018 MW6JPL Sentry17322049-204917.542e-09-5.17-5.170JPL: Computed at 07:16 today Pacific time based on 46 observations spanning 4.4073 days (2018-Jun-19.26519 to 2018-Jun-23.67253). Diameter approximately 0.400 km. from weighted mean H=19.65.
2018 MC5JPL Sentry17322073-211374.2947414e-06-5.81-6.350JPL: Computed at 07:22 today Pacific time based on 33 observations spanning 11.891 days (2018-Jun-12.475331 to 2018-Jun-24.36597). Diameter approximately 0.031 km. from weighted mean H=25.19.

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 24 June '18

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

1842Generated Traffic Report
1732Noted that JPL Sentry has updated its 2018 MC5 risk assessment - see above
Noted that JPL Sentry has updated its 2018 MC7 risk assessment - see above
Noted that JPL Sentry has updated its 2018 MW6 risk assessment - see above
1414Grabbed MPEC 2018-M92 - Daily Orbit Update - see above
0350Grabbed MPEC 2018-M91 - 2017 WL1 - see above
0204Noted that JPL Sentry has posted 2018 MD7 as an impact risk - see above
Grabbed MPEC 2018-M89 - 2018 MD7 - see above
Grabbed MPEC 2018-M90 - 2018 ME7 - see above