Contents  on 25 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 25 July '18

One object reported inside ten LD

Today the last reported minor planet leaves our neighborhood traffic reporting "bubble" with a radius of ten lunar distances (LD). 2018 OQ slips away from 9.21 to 10.45 LD. Next known to be approaching is newly announced 2018 OZ, which enters the bubble on about August 6th, but most likely others will be discovered before then.

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  9.21 to 10.45 LD July 11 - 25 NHATS target, exits ten LD
Approaching - sorted by 10-LD bubble entry date
7.0   LD Aug. 6* 2018 OZ 33 m  25.9 from 28.0 LD Aug. 3 - 9 NEW, Earth passage uncertainty +/- 24 mins.* - MPEC
9.36 LD Aug. 27 2018 LQ2 37 m  13.32 from 13.48 LD Aug. 17 - Sept. 6 NHATS target
4.22 LD Aug. 29 1998 SD9 49 m  88.90 from 92.07 LD Aug. 25 - Sept. 2

This report was updated at 2220 UTC with the discoveries of approaching 2018 OZ (MPEC) and departed 2018 OY (MPEC), which left the bubble yesterday after passing us at 6.22 LD on July 21st. Your first local asteroid traffic report was generated at 1512 UTC.

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 25 July '18

The MPC's NEO Confirmation Page has 8 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eight objects listed. Of these, five were "one nighters." So far The Tracking News has counted a total of thirteen 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 25 July '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.

MPEC 2018-O43 - "18:38 UT" - 2018 OY

MPEC 2018-O42 - "17:00 UT" - 2018 OA1

MPEC 2018-O41 - "16:51 UT" - 2018 OZ

<< DOU on 25 July '18 >>  MPEC 2018-O40 - "12:03 UT" - Daily Orbit Update

Observers  on 25 July '18

A total of 24 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPECs 2018-O40, 2018-O41, 2018-O42 & 2018-O43 -- 2018 OZ, 2018 OY, 2018 OA1, 2018 NE15
T05ATLAS Haleakala in Hawaii, 4 in MPEC 2018-O40 -- 68950, 283729, 13553, 2061
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2018-O40 -- 6569
K46Bamberg Obs. in Germany, 1 in MPEC 2018-O40 -- 1627
160Castelmartini Obs. in Italy, 14 in MPEC 2018-O40 -- 2018 NB, 2018 GA5, 2012 OD1, 2011 GA62, 86878, 86039, 65996, 65706, 438429, 31345, 21277, 162168, 14402, 2061
807Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2018-O40 -- 2018 NG15
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2018-O40 -- 2018 NF15
K87Dettelbach Vineyard Obs. in Germany, 4 in MPECs 2018-O40 & 2018-O43 -- 2018 OY, 398188, 13553, 719
J95Great Shefford Obs. in England, 2 in MPECs 2018-O41 & 2018-O43 -- 2018 OZ, 2018 OY
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 4 in MPECs 2018-O40 & 2018-O41 -- 2018 OZ, 2018 NY14, 2018 MW6, 2018 FS3
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2018-O40 -- 468730
C47Nonndorf Obs. in Austria, 1 in MPEC 2018-O43 -- 2018 OY
C27Pallerols Obs. in Spain, 1 in MPEC 2018-O40 -- 87309
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-O43 -- 2018 OY
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2018-O40 -- 2018 NG15, 2018 NF15, 2018 NE15
F52Pan-STARRS 2 (PS2) in Hawaii, 2 in MPECs 2018-O41 & 2018-O42 -- 2018 OZ, 2018 OA1
C95SATINO-1 in France, 1 in MPEC 2018-O40 -- 2011 GA62
204Schiaparelli Obs. in Italy, 1 in MPEC 2018-O42 -- 2018 OA1
G403Tony Evans in Portugal via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-O40 -- 2018 MM8
Y00SONEAR in Brazil, 1 in MPEC 2018-O40 -- 2061
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2018-O40 -- 2018 KR2, 2005 TG, 2002 NE71
A16Tentlingen Obs. in Switzerland, 1 in MPEC 2018-O40 -- 438429
Z52The Studios Obs., 1 in MPEC 2018-O40 -- 13553
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-O40 -- 2018 NU1, 2018 ML8
L01Visnjan Obs., 3 in MPECs 2018-O41, 2018-O42 & 2018-O43 -- 2018 OZ, 2018 OY, 2018 OA1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 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.





Notes for Today's Latest Risk Assessments
2018 NLNEODyS13062060-2115215.36e-04-3.49-3.50NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2018-07-03.404 to 2018-07-24.464."
2018 MC7NEODyS13062060-2115813.36e-04-4.15-4.550NEODyS: "Based on 42 optical observations (of which 1 are rejected as outliers) from 2018-06-21.395 to 2018-07-24.415."
2018 LANEODyS1427R E M O V E DNEODyS #2 for the day

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 25 July '18

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

2220Updated Traffic Report
1907Grabbed MPEC 2018-O43 - 2018 OY - see above
1736Grabbed MPEC 2018-O41 - 2018 OZ - see above
Grabbed MPEC 2018-O42 - 2018 OA1 - see above
1427Noted that NEODyS has removed 2018 LA as an impact risk - see above
1306Noted that NEODyS has reposted 2018 LA as an impact risk - see above
Noted that NEODyS has updated its 2018 MC7 risk assessment - see above
Noted that NEODyS has updated its 2018 NL risk assessment - see above
Grabbed MPEC 2018-O40 - Daily Orbit Update - see above