Contents  on 17 August '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 17 August '18

Six objects reported inside ten LD

There are six minor objects reported to be inside ten lunar distances (LD) of our planet today. Nearest is newly announced 2018 PT23, which moves away from 5.59 to 6.85 LD.

Neighborhood Traffic - sorted by Earth passage distance
Earth passage I D ~Size Distance today  Inside ten LD Notes
5.57 LD yesterday 2018 PT23 42 m  5.59 to 6.85 LD Aug. 14 - 19 NEW - MPEC, DOU
6.21 LD Aug. 9 2018 PN22 11 m  7.49 to 7.81 LD July 25 - Aug. 23 NHATS target - DOU
7.86 LD tomorrow 2018 PK20 23 m  7.99 from 8.52 LD Aug. 15 - 22 NHATS target - DOU
8.02 LD yesterday 2018 PM20 18 m  8.03 to 8.37 LD Aug. 13 - 19
8.84 LD tomorrow 2018 PO22 82 m  8.89 from 9.46 LD yesterday - Aug. 20
9.36 LD Aug. 27 2018 LQ2 37 m  9.91 from 10.01 LD today - Sept. 6 NHATS target, enters ten LD - DOU
Approaching Traffic
4.22 LD Aug. 29 1998 SD9 49 m  27.62 from 30.04 LD Aug. 25 - Sept. 2 radar target

This report was generated at 1810 UTC with the discovery announced late yesterday of 2018 PT23 (MPEC, DOU) and with follow-up in today's DOU MPEC for inbound objects 2018 PK20 and 2018 LQ2, outbound 2018 PN22, and departed risk-listed objects 2018 PZ21 and 2018 PR7. This last tiny object, by the way, passed us unobserved at 9.53 LD in February 2016.
        Update:  We also note the June radar observation of 2018 LK and 2015 DP155 posted late yesterday.


<< Reading:  For the record and for your possible interest, here follow some news links gathered from the month of July. Perhaps the best piece of news came early, that a fragment of impactor 2018 LA (links) had been found in Botswana. See similar announcements from the University of Helsinki and the SETI Institute with different photos and emphasis.
        The American Meteor Society reported a fireball observed the night of July 8th from Iowa, Illinois, and seven other states. An article said that small meteorite pieces from a March 7th bolide, that was recorded on weather radar, may have been recovered from the ocean floor off the coast of Washington state. And a University of Florida study and news item propose that many or most asteroids and meteorites "originate from five or six ancient minor planets."
        NASA/JPL told how "observations by three of the world's largest radio telescopes" (Arecibo, Goldstone, and Green Bank) revealed that 2017 YE5 is a rare equal-mass binary. NASA/JPL also celebrated twenty years of tracking Near-Earth objects and, in separate news, explained how the Dawn mission is expected to end sometime between now and October, but there is much work ahead studying the collected data.
        In technical news, the Catalina Survey (CSS) posted a science paper telling about its timekeeping infrastructure, and another paper explored the concept of using the DECam image archive to search for active (comet-like) asteroids.



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.

Radar Astrometry  on 17 August '18

Radar observation of six objects

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 2231 UTC when the database was dated 17 Aug.


Data update noted at 2302 UTC when the database was dated 17 Aug.


Data update noted at 2358 UTC when the database was dated 17 Aug.

NEOCP Activity  on 17 August '18

The MPC's NEO Confirmation Page has 52 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 52 objects listed. Of these, sixteen were "one nighters." So far The Tracking News has counted a total of 55 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 17 August '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 17 Aug. '18 >>  MPEC 2018-Q23 - "12:04 UT" - Daily Orbit Update


MPEC 2018-Q22 - "01:56 UT" - Comet C/2018 O1 (ATLAS)

Observers  on 17 August '18

A total of 68 observers appear in today's MPECs.

CodeObserver / observatory
834AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2018-Q23 -- 1627
B37Ametlla del Valles Obs. in Spain, 1 in MPEC 2018-Q22 -- C/2018 O1
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-Q22 -- C/2018 O1
251Arecibo in Puerto Rico, 6 in radar -- 2018 NV, 2018 NE1, 2018 NB, 2018 MB7, 2014 WG365, 398188
H21Astronomical Research Obs. Westfield in Illinois, 25 in MPECs 2018-Q22 & 2018-Q23 -- 2018 PX7, 2018 PW7, 2018 PU7, 2018 PL8, 2018 PK9, 2018 PJ9, 2018 PJ22, 2018 OG, 2018 OB, C/2018 O1, 2018 NY14, 2018 NS1, 2018 NR, 2018 NO1, 2018 NN, 2018 NK4, 2018 NG4, 2018 NG2, 2018 MR8, 2018 MH, 2018 LQ2, 2018 LL2, 2018 JC3, 2015 HF11, 2012 DJ4
T05ATLAS Haleakala in Hawaii, 3 in MPECs 2018-Q22 & 2018-Q23 -- C/2018 O1, 2011 UA, 99799
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2018-Q22 -- C/2018 O1
C77Bernezzo Obs. in Italy, 1 in MPEC 2018-Q22 -- C/2018 O1
B96Brixiis Obs. in Belgium, 1 in MPEC 2018-Q22 -- C/2018 O1
215Buchloe Obs. in Germany, 1 in MPEC 2018-Q22 -- C/2018 O1
X74Campo dos Amarais Obs., 1 in MPEC 2018-Q23 -- 4954
160Castelmartini Obs. in Italy, 1 in MPEC 2018-Q22 -- C/2018 O1
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPEC 2018-Q23 -- 2018 PV7, 2018 PL9, 2018 PK10, 2018 PH9, 2018 PG8, 2018 LR6
K65Cesena Obs. in Italy, 1 in MPEC 2018-Q23 -- 2012 OD1
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2018-Q22 -- C/2018 O1
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2018-Q22 -- C/2018 O1
L29Drebach-South Obs., 1 in MPEC 2018-Q22 -- C/2018 O1
I19El Gato Gris Obs. in Argentina, 1 in MPEC 2018-Q22 -- C/2018 O1
J27El Guijo Obs. in Spain, 1 in MPEC 2018-Q23 -- 13553
151Eschenberg Obs. in Switzerland, 3 in MPEC 2018-Q23 -- 481394, 140039, 4183
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-Q22 -- C/2018 O1
157Frasso Sabino Obs. in Italy, 1 in MPEC 2018-Q22 -- C/2018 O1
K88GINOP-KHK in Hungary, 1 in MPEC 2018-Q22 -- C/2018 O1
J77Golden Hill Obs. in England, 1 in MPEC 2018-Q22 -- C/2018 O1
J95Great Shefford Obs. in England, 4 in MPECs 2018-Q22 & 2018-Q23 -- 2018 PN22, 2018 PK20, 2018 PJ10, C/2018 O1
A17Guidestar Obs. in Germany, 8 in MPEC 2018-Q23 -- 2018 PW7, 2018 PU7, 2018 PL10, 2018 PJ10, 2018 LZ5, 2016 NF23, 2005 RB, 1999 VQ11
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2018-Q22 -- C/2018 O1
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-Q22 -- C/2018 O1
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-Q22 -- C/2018 O1
W19Kalamazoo Obs. in Michigan, 1 in MPEC 2018-Q23 -- 719
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2018-Q22 -- C/2018 O1
Z43Landehen Obs., 5 in MPEC 2018-Q23 -- 2018 PN20, 2015 QM3, 162168, 140039, 138847
K38M57 Obs. in Italy, 1 in MPEC 2018-Q22 -- C/2018 O1
C10Maisoncelles Obs. in France, 1 in MPEC 2018-Q22 -- C/2018 O1
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2018-Q23 -- 2007 PR10
711McDonald Obs. in Texas, 1 in MPEC 2018-Q22 -- C/2018 O1
118Modra Obs. in Slovakia, 1 in MPEC 2018-Q22 -- C/2018 O1
108Montelupo Obs. in Italy, 2 in MPEC 2018-Q23 -- 398188, 1627
C47Nonndorf Obs. in Austria, 3 in MPECs 2018-Q22 & 2018-Q23 -- 2018 PW7, 2018 PJ10, C/2018 O1
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-Q22 -- C/2018 O1
C23Olmen Obs. in Belgium, 2 in MPECs 2018-Q22 & 2018-Q23 -- C/2018 O1, 2061
I41Palomar Transient Factory (PTF) in southern California, 3 in MPECs 2018-Q22 & 2018-Q23 -- C/2018 O1, 138847, 115052
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2018-Q22 & 2018-Q23 -- 2018 PL10, C/2018 O1, 2018 FO5, 478574, 422977, 13553
K63Pascoli Obs. in Italy, 1 in MPEC 2018-Q22 -- C/2018 O1
B49Paus Obs. in Spain, 1 in MPEC 2018-Q22 -- C/2018 O1
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2018-Q22 -- C/2018 O1
W25RMS Obs., 1 in MPEC 2018-Q22 -- C/2018 O1
L04ROASTERR-1 in Romania, 1 in MPEC 2018-Q22 -- C/2018 O1
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2018-Q22 & 2018-Q23 -- 2018 PT23, C/2018 O1
679San Pedro Martir Obs. in Mexico, 4 in MPEC 2018-Q23 -- 2018 PZ21, 2018 PP10, 2018 PL23, 2018 PG21
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-Q22 -- C/2018 O1
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2018-Q22 -- C/2018 O1
C95SATINO-1 in France, 3 in MPECs 2018-Q22 & 2018-Q23 -- C/2018 O1, 2001 SC170, 13553
204Schiaparelli Obs. in Italy, 3 in MPECs 2018-Q22 & 2018-Q23 -- 2018 PT23, 2018 PR10, C/2018 O1
Q11Shinshiro Obs., 1 in MPEC 2018-Q22 -- C/2018 O1
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-Q22 -- C/2018 O1
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-Q23 -- 2018 PL9
Y00SONEAR in Brazil, 1 in MPEC 2018-Q23 -- 99799
587Sormano Obs. in Italy, 1 in MPEC 2018-Q22 -- C/2018 O1
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2018-Q22 -- C/2018 O1
W34Squirrel Valley Obs. in North Carolina, 2 in MPEC 2018-Q23 -- 2018 PW7, 180186
A71Stixendorf Obs. in Austria, 1 in MPEC 2018-Q22 -- C/2018 O1
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2018-Q22 -- C/2018 O1
Z52The Studios Obs., 2 in MPEC 2018-Q23 -- 13553, 6456
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-Q23 -- 2018 PR7, 2017 QG33
166Upice Obs. in Czech Republic, 1 in MPEC 2018-Q23 -- 2018 GA5
L01Visnjan Obs., 3 in MPECs 2018-Q22 & 2018-Q23 -- 2018 PX19, 2018 PS23, C/2018 O1
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2018-Q23 -- 66008, 413563, 719
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 August '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 PZ21NEODyS19352045-2113341.06e-04-4.91-5.130NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2018-08-12.369 to 2018-08-17.300."
JPL Sentry15302045-2108278.6108565e-05-4.97-5.190JPL: Computed at 08:21 today Pacific time based on 15 observations spanning 4.9307 days (2018-Aug-12.36837 to 2018-Aug-17.299034). Diameter approximately 0.016 km. from weighted mean H=26.70.
2018 PG21NEODyS19352107-211658.41e-08-4.48-4.650NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2018-08-08.552 to 2018-08-16.479."
JPL Sentry15302098-2115101.255974e-07-4.38-4.810JPL: Computed at 08:07 today Pacific time based on 15 observations spanning 7.9270 days (2018-Aug-08.55164 to 2018-Aug-16.478612). Diameter approximately 0.480 km. from weighted mean H=19.26.
2018 PP10NEODyS1935R E M O V E D-
2018 PR7NEODyS19352097-211754.49e-08-9.47-9.510NEODyS: "Based on 55 optical observations (of which 0 are rejected as outliers) from 2018-08-06.267 to 2018-08-14.408."
JPL Sentry15302097-209714.237e-09-10.50-10.50JPL: Computed at 07:49 today Pacific time based on 55 observations spanning 8.1407 days (2018-Aug-06.26605 to 2018-Aug-14.406722). Diameter approximately 0.007 km. from weighted mean H=28.53.

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 17 August '18

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

2358Noted Radar Astrometry database update - see above
2302Noted Radar Astrometry database update - see above
2231Noted Radar Astrometry database update - see above
1935Noted that NEODyS has updated its 2018 PG21 risk assessment - see above
Noted that NEODyS has removed 2018 PP10 as an impact risk - see above
Noted that NEODyS has updated its 2018 PR7 risk assessment - see above
Noted that NEODyS has updated its 2018 PZ21 risk assessment - see above
1810Generated Traffic Report
1530Noted that JPL Sentry has updated its 2018 PG21 risk assessment - see above
Noted that JPL Sentry has reposted 2018 PR7 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 PZ21 risk assessment - see above
Grabbed MPEC 2018-Q23 - Daily Orbit Update - see above
0315Grabbed MPEC 2018-Q22 - Comet C/2018 O1 (ATLAS) - see above