Contents  on 24 July '18

NOTE:  These A/CC news pages will update less often for an extended period. All discoveries and observing credits will be reported, but we may miss some interim impact risk assessments and undercount NEOCP objects, and there may be some days without a traffic report for Earth's Busy Neighborhood.

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 July '18

One object reported inside ten LD

One transient natural object is known to be within ten lunar distances (LD) of Earth today. 2018 OQ is on the way out, moving from 7.99 to 9.21 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
3.72 LD July 18 2018 OQ 16 m  7.99 to 9.21 LD July 11 - 25 NHATS target - DOU
Approaching (sorted by 10-LD bubble entry date)
9.36 LD Aug. 27 2018 LQ2 37 m  13.48 from 13.65 LD Aug. 17 - Sept. 6 NHATS target
4.22 LD Aug. 29 1998 SD9 49 m  92.07 from 95.31 LD Aug. 25 - Sept. 2

This report was generated at 1818 UTC with follow-up in today's DOU MPEC for outbound 2018 OQ and departed risk-listed objects 2018 NL and 2018 MC7, plus astrometry from June and July 1st for 2018 MG7, 2018 MB7, 2018 MK, 2018 MJ, and 2018 LK.



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 July '18

The MPC's NEO Confirmation Page has 11 listings

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

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.


<< DOU on 24 July '18 >>  MPEC 2018-O39 - "12:03 UT" - Daily Orbit Update


MPEC 2018-O38 - "02:29 UT" - Comet C/2018 N1 (Neowise)

Observers  on 24 July '18

A total of 36 observers appear in today's MPECs.

CodeObserver / observatory
L2729PREMOTE Obs., 1 in MPEC 2018-O38 -- C/2018 N1
349Ageo Obs. in Japan, 1 in MPEC 2018-O38 -- C/2018 N1
H21Astronomical Research Obs. Westfield in Illinois, 14 in MPEC 2018-O39 -- 2018 OB, 2018 NU3, 2018 NU1, 2018 NO1, 2018 NN3, 2018 NJ4, 2018 NB, 2018 MS6, 2018 MM8, 2018 MH, 2018 LG1, 2018 JS1, 2018 JC3, 2017 GT5
T05ATLAS Haleakala in Hawaii, 14 in MPECs 2018-O38 & 2018-O39 -- 2018 NU3, 2018 NB, C/2018 N1, 2002 OS4, 89959, 31345, 21277, 18109, 17182, 7350, 6456, 4183, 2061, 719
T08ATLAS Mauna Loa in Hawaii, 5 in MPECs 2018-O38 & 2018-O39 -- C/2018 N1, 2018 MM8, 66008, 455550, 115052
K46Bamberg Obs. in Germany, 1 in MPEC 2018-O39 -- 13553
215Buchloe Obs. in Germany, 1 in MPEC 2018-O38 -- C/2018 N1
W96Campo Catino Austral Obs. in Chile, 1 in MPEC 2018-O38 -- C/2018 N1
160Castelmartini Obs. in Italy, 6 in MPEC 2018-O39 -- 2018 NU3, 2018 MR8, 2018 MM8, 2015 BR514, 2002 OS4, 162483
A77Chante-Perdrix Obs. in France, 1 in MPEC 2018-O38 -- C/2018 N1
J01Cielo Profundo Obs. in Spain, 1 in MPEC 2018-O38 -- C/2018 N1
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2018-O38 -- C/2018 N1
K87Dettelbach Vineyard Obs. in Germany, 4 in MPEC 2018-O39 -- 162483, 13553, 2061, 719
J27El Guijo Obs. in Spain, 2 in MPEC 2018-O39 -- 2018 MR8, 68950
J95Great Shefford Obs. in England, 1 in MPEC 2018-O39 -- 2018 NN3
A17Guidestar Obs. in Germany, 4 in MPEC 2018-O39 -- 2018 NU3, 2018 ND1, 2018 NB, 2018 LZ5
H15ISON New Mexico Obs. in New Mexico, 2 in MPEC 2018-O39 -- 99799, 31345
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-O38 -- C/2018 N1
Q62?B. Lutkenhoner in Germany via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-O38 -- C/2018 N1
Q62[M. Suzuki in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-O38 -- C/2018 N1
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 6 in MPEC 2018-O39 -- 2018 NL, 2018 MC7, 2018 LB1, 2018 FO5, 2009 WM1, 497174
Z43Landehen Obs., 4 in MPEC 2018-O39 -- 2011 GA62, 162168, 13553, 2061
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-O39 -- 37336
D81Nagano Obs. in Japan, 1 in MPEC 2018-O38 -- C/2018 N1
C23Olmen Obs. in Belgium, 1 in MPEC 2018-O39 -- 1627
C27Pallerols Obs. in Spain, 1 in MPEC 2018-O39 -- 87309
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2018-O39 -- 253062
C95SATINO-1 in France, 1 in MPEC 2018-O39 -- 144332
204Schiaparelli Obs. in Italy, 29 in MPEC 2018-O39 -- 2018 OQ, 2018 NV, 2018 MY6, 2018 MW6, 2018 MM8, 2018 MK, 2018 MJ, 2018 MG7, 2018 MB7, 2018 LU3, 2018 LT6, 2018 LN4, 2018 LN2, 2018 LN, 2018 LK, 2018 LH5, 2018 LF5, 2018 LF1, 2018 LD3, 2018 KV, 2018 JY1, 2018 JE1, 2018 JC3, 2018 GA5, 2017 YE5, 2015 FP118, 2014 US192, 2012 FN62, 1999 LK1
Q11Shinshiro Obs., 1 in MPEC 2018-O38 -- C/2018 N1
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-O39 -- 2018 NU3
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-O38 -- C/2018 N1
Y00SONEAR in Brazil, 1 in MPEC 2018-O38 -- C/2018 N1
691Spacewatch 0.9m telescope in Arizona, 11 in MPEC 2018-O39 -- 2018 MW6, 2018 MS6, 2018 MH, 2018 MD7, 2018 LU3, 2018 KG1, 2018 FS3, 2017 YC8, 2014 DN112, 2012 FN62, 1999 RB32
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2018-O39 -- 2018 NY14, 2018 NV, 2018 LL2, 2007 ML24, 2004 TG10, 2002 QQ40
Q38Swan Hill Obs., 1 in MPEC 2018-O38 -- C/2018 N1
H47Vicksburg Obs. in Mississippi, 1 in MPEC 2018-O38 -- C/2018 N1
C51WISE in Earth polar orbit, 7 in MPEC 2018-O39 -- 2014 US192, 2012 DG61, 65706, 517829, 443923, 363027, 115052
367Yatsuka Obs. in Japan, 1 in MPEC 2018-O38 -- C/2018 N1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 July '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 NLJPL Sentry15372060-210974.7945855e-05-4.51-4.530JPL: Computed at 07:31 today Pacific time based on 26 observations spanning 21.060 days (2018-Jul-03.40294 to 2018-Jul-24.46303). Diameter approximately 0.029 km. from weighted mean H=25.30.
2018 MC7JPL Sentry15372060-2109250.00151718885-3.46-3.460JPL: Computed at 07:34 today Pacific time based on 41 observations spanning 33.020 days (2018-Jun-21.39443 to 2018-Jul-24.41401). Diameter approximately 0.021 km. from weighted mean H=26.07.

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 July '18

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

1818Generated Traffic Report
1537Noted that JPL Sentry has updated its 2018 MC7 risk assessment - see above
Noted that JPL Sentry has updated its 2018 NL risk assessment - see above
1430Grabbed MPEC 2018-O38 - Comet C/2018 N1 (Neowise) - see above
Grabbed MPEC 2018-O39 - Daily Orbit Update - see above