Contents  on 9 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 9 August '18

Two objects reported inside ten LD

Two small Solar-System bodies are reported inside ten lunar distances (LD) of our planet today. Nearest is risk-listed 2018 PR7, which is outbound from 3.10 to 3.98 LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
1.36 LD Aug. 6 2018 PR7 7 m  3.10 to 3.98 LD July 26 - Aug. 16 NHATS target, risk - DOU
6.97 LD Aug. 6 2018 OZ 35 m  8.81 to 10.27 LD Aug. 3 - 9 NHATS target, exits ten LD
Approaching Traffic - sorted by 10-LD bubble entry date
9.36 LD Aug. 27 2018 LQ2 37 m  10.92 from 11.07 LD Aug. 17 - Sept. 6 NHATS target - DOU
4.22 LD Aug. 29 1998 SD9 49 m  47.34 from 49.88 LD Aug. 25 - Sept. 2

This report was generated at 1840 UTC with follow-up in today's DOU MPEC for approaching 2018 LQ2, outbound 2018 PR7, and departed risk-listed 2018 PY7.



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 9 August '18

Radar observation of two 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 2300 UTC when the database was dated 9 Aug.


Data update noted at 2359 UTC when the database was dated 9 Aug.

NEOCP Activity  on 9 August '18

The MPC's NEO Confirmation Page has 94 listings

When last checked at 2331 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 94 objects listed. Of these, 41 were "one nighters." The Tracking News counted a total of 107 listings on the NEOCP on this day.

New MPECs  on 9 August '18

Minor Planet Electronic Circulars

There were two MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2018-P33 - "18:43 UT" - 2007 DG8


<< DOU on 9 Aug. '18 >>  MPEC 2018-P32 - "12:04 UT" - Daily Orbit Update

Observers  on 9 August '18

A total of 20 observers appeared in this day's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 68347
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPEC 2018-P32 -- 2018 NF2, 2018 MY4, 2018 MX6, 2018 MU4, 2018 MA, 2018 LS6, 2018 LQ2, 2018 LN5, 2018 KH, 2018 KD1, 2015 JP, 2009 UX17, 27346
T05ATLAS Haleakala in Hawaii, 25 in MPEC 2018-P32 -- 2018 PU7, 2018 NU3, 2018 NN, 2018 KE3, 2017 YC8, 2015 OH, 2009 SK104, 96189, 86324, 414960, 398188, 31345, 21277, 18882, 18109, 180186, 17274, 17182, 15745, 140158, 6456, 4183, 1685, 1627, 719
T08ATLAS Mauna Loa in Hawaii, 11 in MPEC 2018-P32 -- 2018 LQ2, 2015 QM3, 2012 OD1, 87309, 86878, 66008, 65996, 54401, 455550, 436771, 413563
X74Campo dos Amarais Obs., 2 in MPEC 2018-P32 -- 2005 UY5, 4954
Z45Cosmos Obs., 1 in MPEC 2018-P32 -- 18109
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 4 in MPEC 2018-P32 -- 2018 PY7, 2018 PR7, 2018 NU3, 2018 NS1
G26Fushan Obs. in China, 1 in MPEC 2018-P32 -- 2061
K88GINOP-KHK in Hungary, 1 in MPEC 2018-P32 -- 2018 PL8
253Goldstone DSS-14 70m antenna in southern California, 2 in radar -- 68347, 441987
585Kiev Comet Station in Ukraine, 1 in MPEC 2018-P32 -- 3752
608NEAT's USAF Haleakala telescope in Hawaii, 5 in MPEC 2018-P32 -- 154658, 154656, 154330, 154302, 154278
I41Palomar Transient Factory (PTF) in southern California, 3 in MPEC 2018-P32 -- 2015 BR514, 13553, 11500
F51Pan-STARRS 1 (PS1) in Hawaii, 25 in MPECs 2018-P32 & 2018-P33 -- 2018 PT7, 2018 NJ2, 2018 LU3, 2018 KE3, 2016 YV8, 2015 RB82, 2008 CB22, 2008 BC22, 2007 DG8, 2005 PJ2, 509821, 478574, 416231, 365449, 343098, 322913, 317212, 286080, 231792, 18109, 162723, 162567, 16064, 137044, 4341
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2018-P33 -- 2007 DG8
K63Pascoli Obs. in Italy, 1 in MPEC 2018-P32 -- 2018 PR7
W71Rand II Obs. in New York, 3 in MPEC 2018-P32 -- 455550, 415029, 283729
104San Marcello Pistoiese Obs. in Italy, 2 in MPEC 2018-P32 -- 2018 PL8, 2018 JC3
C95SATINO-1 in France, 1 in MPEC 2018-P32 -- 719
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-P32 -- 2018 OK, 1999 LK1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 August '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2331 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 PF8NEODyS15302028-2117285.09e-09-5.34-6.020NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2018-08-05.276 to 2018-08-08.147."
2018 PY7JPL Sentry15302097-2115162.11412366e-05-5.75-6.380JPL: Computed at 08:06 today Pacific time based on 20 observations spanning 3.3592 days (2018-Aug-05.56103 to 2018-Aug-08.920209). Diameter approximately 0.016 km. from weighted mean H=26.60.
2018 PR7JPL Sentry15302097-210531.604232e-05-6.93-6.950JPL: Computed at 08:09 today Pacific time based on 35 observations spanning 2.6469 days (2018-Aug-06.26605 to 2018-Aug-08.912984). Diameter approximately 0.006 km. from weighted mean H=28.58.

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 9 August '18

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

2359Noted Radar Astrometry database update - see above
2300Noted Radar Astrometry database update - see above
1901Grabbed MPEC 2018-P33 - 2007 DG8 - see above
1840Generated Traffic Report
1530Noted that NEODyS has posted 2018 PF8 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 PR7 risk assessment - see above
Noted that JPL Sentry has updated its 2018 PY7 risk assessment - see above
Grabbed MPEC 2018-P32 - Daily Orbit Update - see above