Contents  on 7 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 7 July '18

Three objects reported inside ten LD

There are three minor objects reported within ten lunar distances (LD) of Earth today. The nearest is inside our planet's sphere of gravitational influence. Risk-listed 2018 NJ comes its closest to Earth this time around, reaching 2.37 LD at 0057 UTC.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 2.41, 5.0 & 10.0 LD boundaries
2.37 LD today 2018 NJ 10 m  2.37 LD June 29 - July 14 NHATS target, Earth closest at 0057 UTC, risk - DOU
2.78 LD July 4 2018 MB7 59 m  7.41 to 9.88 LD June 30 - tomorrow
6.01 LD June 29 2018 LR3 19 m  8.70 to 9.36 LD June 20 - tomorrow NHATS target, risk
Approaching - sorted by 10-LD bubble entry date
1.4   LD July 17* 2018 NM 18 m  13.9 from 15.4 LD July 10 - 23 NEW, Earth passage uncertainty +/- 33 mins.* - MPEC
9.36 LD Aug. 27 2018 LQ2 39 m  16.11 from 16.26 LD Aug. 17 - Sept. 6 NHATS target
4.22 LD Aug. 29 1998 SD9 49 m  161.73 from 167.14 LD Aug. 25 - Sept. 2

This report was generated at 2258 UTC with the discoveries of approaching 2018 NM (MPEC) and already departed risk-listed 2018 NL (MPEC), which went by us at 1.42 LD on June 28th. Today's DOU MPEC has follow-up for passing 2018 NJ and departed objects 2018 NH, 2015 DP155, 441987 2010 NY65, and risk-listed 2018 MC7.



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 7 July '18

The MPC's NEO Confirmation Page has 17 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seventeen objects listed. Of these, eight were "one nighters." So far The Tracking News has counted a total of 22 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 7 July '18

Minor Planet Electronic Circulars

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


MPEC 2018-N25 - "19:00 UT" - 2011 DS9


<< DOU on 7 July '18 >>  MPEC 2018-N24 - "12:04 UT" - Daily Orbit Update


MPEC 2018-N23 - "11:25 UT" - 2018 NL


MPEC 2018-N22 - "11:22 UT" - 2018 NN


MPEC 2018-N21 - "11:20 UT" - 2018 NM

Observers  on 7 July '18

A total of 30 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-N22 -- 2018 NN
T05ATLAS Haleakala in Hawaii, 11 in MPECs 2018-N22 & 2018-N24 -- 2018 NN, 2018 KE3, 2017 YE5, 2015 DP155, 2012 PG6, 2009 SK104, 2005 UY5, 86829, 86324, 444935, 152637
K46Bamberg Obs. in Germany, 1 in MPEC 2018-N24 -- 1627
X74Campo dos Amarais Obs., 3 in MPEC 2018-N24 -- 2012 PG6, 86324, 6569
160Castelmartini Obs. in Italy, 3 in MPEC 2018-N24 -- 65996, 415029, 162168
703Catalina Sky Survey in Arizona, 1 in MPEC 2018-N22 -- 2018 NN
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2018-N21 -- 2018 NM
G58Chabot Obs. in northern California, 1 in MPEC 2018-N24 -- 2018 LH5
K87Dettelbach Vineyard Obs. in Germany, 3 in MPEC 2018-N24 -- 2018 LF5, 2018 KV, 2018 JC3
734Farpoint Obs. in Kansas, 1 in MPEC 2018-N23 -- 2018 NL
J95Great Shefford Obs. in England, 1 in MPEC 2018-N24 -- 2018 NJ
A17Guidestar Obs. in Germany, 2 in MPEC 2018-N24 -- 2018 MM8, 2018 LH5
K38M57 Obs. in Italy, 2 in MPEC 2018-N24 -- 2018 NA, 441987
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2018-N24 -- 326386
568^R. Wainscoat on Mauna Kea in Hawaii, 2 in MPECs 2018-N21 & 2018-N24 -- 2018 NM, 2018 LG16
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2018-N23 & 2018-N24 -- 2018 NL, 2018 KV, 505657, 415029, 337228, 259802, 16834
Z80Northolt Branch Obs. in England, 2 in MPEC 2018-N24 -- 2018 GA5, 138847
C23Olmen Obs. in Belgium, 1 in MPEC 2018-N24 -- 1627
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2018-N21 & 2018-N24 -- 2018 NM, 2018 LG16, 2009 SK104, 326386
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2018-N21 -- 2018 NM
W71Rand II Obs. in New York, 4 in MPEC 2018-N24 -- 68950, 455550, 441987, 138847
L04ROASTERR-1 in Romania, 3 in MPEC 2018-N24 -- 455550, 441987, 138847
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-N22 -- 2018 NN
Y00SONEAR in Brazil, 4 in MPECs 2018-N22 & 2018-N24 -- 2018 NN, 2017 YE5, 86324, 17274
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2018-N24 -- 2018 NA, 2018 MV4, 2018 ME5, 2018 MC7, 2018 MC5, 2018 JJ2
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-N24 -- 163691
I52Steward Obs. Mt. Lemmon Station in Arizona, 26 in MPECs 2018-N21, 2018-N22, 2018-N23 & 2018-N24 -- 2018 NN, 2018 NM, 2018 NL, 2018 NH, 2018 NE, 2018 ND, 2018 NC, 2018 NA, 2018 MX6, 2018 MW6, 2018 MV4, 2018 MU6, 2018 MS6, 2018 MR8, 2018 MR5, 2018 MK8, 2018 MJ7, 2018 MC5, 2018 LU15, 2018 LO6, 2018 LH5, 2018 LF5, 2018 GT1, 2018 AP12, 2018 AL13, 2008 CP23
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-N25 -- 2011 DS9
L01Visnjan Obs., 1 in MPEC 2018-N22 -- 2018 NN
C51WISE in Earth polar orbit, 2 in MPEC 2018-N24 -- 2018 LL2, 2018 KV
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 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 NLNEODyS19242025-2118803.53e-04-3.58-3.76-NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2018-07-03.404 to 2018-07-07.333. "
JPL Sentry14002057-2112360.00018491893-3.98-4.480JPL: Computed at 05:32 today Pacific time based on 13 observations spanning 3.9291 days (2018-Jul-03.40294 to 2018-Jul-07.33202). Diameter approximately 0.034 km. from weighted mean H=24.97.
2018 NJNEODyS19242076-21181315.77e-04-4.86-5.3-NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2018-07-05.276 to 2018-07-06.998."
JPL Sentry14322076-2117560.0004532748115-4.95-4.990JPL: Computed at 07:22 today Pacific time based on 26 observations spanning 1.7222 days (2018-Jul-05.27485 to 2018-Jul-06.997084). Diameter approximately 0.010 km. from weighted mean H=27.73.
2018 MC7NEODyS19242060-2116985.89e-04-3.80-4.070NEODyS: "Based on 31 optical observations (of which 1 are rejected as outliers) from 2018-06-21.395 to 2018-07-07.467."
JPL Sentry14322060-2115320.0008745056338-3.62-3.640JPL: Computed at 07:21 today Pacific time based on 31 observations spanning 16.072 days (2018-Jun-21.39443 to 2018-Jul-07.46657). Diameter approximately 0.022 km. from weighted mean H=25.91.
2018 MC5NEODyS19242081-211781.31e-05-5.39-5.40NEODyS: "Based on 40 optical observations (of which 0 are rejected as outliers) from 2018-06-12.476 to 2018-07-07.431."
JPL Sentry14322095-209512.319e-06-6.12-6.120JPL: Computed at 07:15 today Pacific time based on 40 observations spanning 24.955 days (2018-Jun-12.475331 to 2018-Jul-07.43051). Diameter approximately 0.031 km. from weighted mean H=25.17.
2018 LG16NEODyS1924R E M O V E D-
JPL Sentry1432R E M O V E DJPL: Risk listing removed at 1409 UTC today

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 7 July '18

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

2258Generated Traffic Report
1924Noted that NEODyS has removed 2018 LG16 as an impact risk - see above
Noted 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 posted 2018 NL as an impact risk - see above
Grabbed MPEC 2018-N25 - 2011 DS9 - see above
1432Noted that JPL Sentry has removed 2018 LG16 as an impact risk - see above
Noted 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 NJ risk assessment - see above
1400Noted that JPL Sentry has posted 2018 NL as an impact risk - see above
Grabbed MPEC 2018-N21 - 2018 NM - see above
Grabbed MPEC 2018-N22 - 2018 NN - see above
Grabbed MPEC 2018-N23 - 2018 NL - see above
Grabbed MPEC 2018-N24 - Daily Orbit Update - see above