Contents  on 18 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 18 July '18

Two objects reported inside ten LD

There are two asteroids reported less than ten lunar distances (LD) from our home world today. Closest is 2018 NM, which leaves Earth's sphere of gravitational influence as it flies away from 1.81 to 3.00 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
0.30 LD July 7 2018 NX 10 m  7.71 to 8.44 LD June 24 - July 21 intruder, NHATS target
1.40 LD yesterday 2018 NM 18 m  1.81 to 3.00 LD July 10 - 23 NHATS target, exits Earth SOI - DOU
Approaching - sorted by 10-LD bubble entry date
9.36 LD Aug. 27 2018 LQ2 37 m  14.44 from 14.60 LD Aug. 17 - Sept. 6 NHATS target
4.22 LD Aug. 29 1998 SD9 49 m  112.79 from 116.58 LD Aug. 25 - Sept. 2

This report was generated at 2250 UTC with follow-up in today's DOU MPEC for 2018 NM and an apparently more accurate restatement of astrometry for impactor 2018 LA (links).



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 18 July '18

The MPC's NEO Confirmation Page has 26 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 26 objects listed. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 40 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 18 July '18

Minor Planet Electronic Circulars

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


<< DOU on 18 July '18 >>  MPEC 2018-O23 - "12:03 UT" - Daily Orbit Update


MPEC 2018-O22 - "10:41 UT" - 2018 OG


MPEC 2018-O21 - "10:38 UT" - 2018 OF

Observers  on 18 July '18

A total of 31 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPECs 2018-O22 & 2018-O23 -- 2018 OG, 2013 OH
T05ATLAS Haleakala in Hawaii, 17 in MPEC 2018-O23 -- 2015 BR514, 2012 BV26, 2011 GA62, 2009 SK104, 85989, 68950, 66391, 66008, 518635, 398188, 350964, 283729, 21277, 138847, 13553, 1866, 1580
T08ATLAS Mauna Loa in Hawaii, 40 in MPEC 2018-O23 -- 2018 NF4, 2018 NE1, 2018 NB, 2018 LA, 2017 YE5, 2015 RB82, 2015 BR514, 2014 NE3, 2009 SK104, 2005 UY5, 99799, 89959, 87311, 86324, 68950, 68350, 66391, 518640, 518635, 511523, 444935, 326386, 302591, 283729, 25916, 21277, 189865, 18882, 18109, 17274, 153957, 139345, 138847, 7350, 6569, 6456, 2061, 1866, 1627, 719
K46Bamberg Obs. in Germany, 1 in MPEC 2018-O23 -- 1627
X74Campo dos Amarais Obs., 1 in MPEC 2018-O23 -- 1916
K87Dettelbach Vineyard Obs. in Germany, 2 in MPEC 2018-O23 -- 2018 OB, 2018 NL4
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-O21 -- 2018 OF
K73Gravina Obs. in Italy, 1 in MPEC 2018-O23 -- 25916
J95Great Shefford Obs. in England, 1 in MPEC 2018-O21 -- 2018 OF
A17Guidestar Obs. in Germany, 2 in MPEC 2018-O23 -- 2018 NU3, 2018 LZ5
Z43Landehen Obs., 3 in MPEC 2018-O23 -- 2018 NV, 2018 MR8, 138847
K38M57 Obs. in Italy, 2 in MPEC 2018-O23 -- 2018 OB, 2018 MM8
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-O23 -- 87311
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2018-O21 -- 2018 OF
474Mt. John Obs. in New Zealand, 15 in MPECs 2018-O21, 2018-O22 & 2018-O23 -- 2018 OG, 2018 OF, 2018 NW1, 2018 NT3, 2018 NT2, 2018 NM, 2018 NJ2, 2018 NJ1, 2018 NH4, 2018 NH2, 2018 MY6, 2018 MR5, 2018 MK8, 2018 LU3, 2017 XB2
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2018-O23 -- 2018 LA
Z80Northolt Branch Obs. in England, 2 in MPEC 2018-O23 -- 2018 NE1, 2018 MR8
J43Oukaimeden Obs. in Morocco, 2 in MPEC 2018-O23 -- 2002 OS4, 4183
I41Palomar Transient Factory (PTF) in southern California, 4 in MPEC 2018-O23 -- 2018 NL4, 2018 NE4, 2018 GA5, 85804
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-O23 -- 2018 JJ2
F52Pan-STARRS 2 (PS2) in Hawaii, 16 in MPECs 2018-O21, 2018-O22 & 2018-O23 -- 2018 OG, 2018 OF, 2014 YR43, 2008 CP23, 87311, 509456, 495829, 445267, 341050, 31345, 264308, 243298, 189973, 162854, 15745, 719
K63Pascoli Obs. in Italy, 1 in MPEC 2018-O23 -- 2018 NF4
A53Peschiera del Garda Obs. in Italy, 2 in MPEC 2018-O23 -- 2018 NB, 2018 MR8
K80Platanus Obs., 1 in MPEC 2018-O23 -- 2018 NL4
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2018-O21 & 2018-O22 -- 2018 OG, 2018 OF
204Schiaparelli Obs. in Italy, 2 in MPECs 2018-O21 & 2018-O22 -- 2018 OG, 2018 OF
Y00SONEAR in Brazil, 3 in MPEC 2018-O23 -- 2018 NB, 25916, 17274
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2018-O23 -- 2018 LA
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-O23 -- 2018 KP1, 2018 KC2
L01Visnjan Obs., 1 in MPEC 2018-O21 -- 2018 OF
C51WISE in Earth polar orbit, 1 in MPEC 2018-O23 -- 2017 YE5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 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 NLNEODyS15022057-2114234.6e-04-3.53-3.550NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2018-07-03.404 to 2018-07-15.601."
2018 NJNEODyS15022082-2118622.45e-03-4.27-4.28n/aNEODyS: "Based on 32 optical observations (of which 1 are rejected as outliers) from 2018-07-05.276 to 2018-07-15.612."
2018 MC7NEODyS15022060-2117833.5e-04-4.13-4.550NEODyS: "Based on 38 optical observations (of which 1 are rejected as outliers) from 2018-06-21.395 to 2018-07-15.528."
2018 MC5NEODyS15022110-211244.72e-07-6.97-7.040NEODyS: "Based on 50 optical observations (of which 0 are rejected as outliers) from 2018-06-12.476 to 2018-07-15.623."

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 18 July '18

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

2250Generated Traffic Report
1502Noted that NEODyS has updated its 2018 MC5 risk assessment - see above
Noted that NEODyS has updated its 2018 MC7 risk assessment - see above
Noted that NEODyS has updated its 2018 NJ risk assessment - see above
Noted that NEODyS has updated its 2018 NL risk assessment - see above
Grabbed MPEC 2018-O21 - 2018 OF - see above
Grabbed MPEC 2018-O22 - 2018 OG - see above
Grabbed MPEC 2018-O23 - Daily Orbit Update - see above