Contents  on 8 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 8 August '18

Three objects reported inside ten LD

There are three transient natural objects known to be within ten lunar distances (LD) of Earth today. Newly announced risk-listed 2018 PR7 is the closest. It exits Earth's sphere of gravitational influence (SOI), moving out from 2.28 to 3.10 LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 2.41, 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
1.07 LD Aug. 3 2018 PY7 16 m  9.26 to 11.48 LD July 30 - today NEW, Moon buzzer, exits ten LD, risk - MPEC
1.36 LD Aug. 6 2018 PR7 6 m  2.28 to 3.10 LD July 26 - Aug. 16 NEW, NHATS target, exits Earth SOI, risk - MPEC
6.97 LD Aug. 6 2018 OZ 35 m  7.68 to 8.81 LD Aug. 3 - 9 NHATS target
Approaching Traffic - sorted by 10-LD bubble entry date
9.36 LD Aug. 27 2018 LQ2 37 m  11.07 from 11.22 LD Aug. 17 - Sept. 6 NHATS target
4.22 LD Aug. 29 1998 SD9 49 m  49.88 from 52.44 LD Aug. 25 - Sept. 2

This report was generated at 1811 UTC with the discoveries of risk-listed outbound 2018 PY7 (MPEC) and, from late yesterday, 2018 PY7 (MPEC), which buzzed the Moon at 0.71 LD on August 4th. Today's DOU MPEC has the recovery of distant 2018 DH1, follow-up for departed objects 2018 OQ and risk-listed 2018 MC7, and astrometry from early July for 2018 NH.



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 8 August '18

The MPC's NEO Confirmation Page has 103 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 103 objects listed. Of these, 68 were "one nighters." So far The Tracking News has counted a total of 128 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 8 August '18

Minor Planet Electronic Circulars

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


MPEC 2018-P31 - "22:46 UT" - 2018 PF8


MPEC 2018-P30 - "22:42 UT" - 2018 PL8


MPEC 2018-P29 - "22:38 UT" - 2018 PK8


MPEC 2018-P28 - "22:34 UT" - 2018 PJ8


MPEC 2018-P27 - "22:29 UT" - 2018 PH8


MPEC 2018-P26 - "22:25 UT" - 2018 PG8


<< DOU on 8 Aug. '18 >>  MPEC 2018-P25 - "12:04 UT" - Daily Orbit Update


MPEC 2018-P24 - "10:49 UT" - 2018 PY7


MPEC 2018-P23 - "10:46 UT" - 2018 PX7


MPEC 2018-P22 - "10:43 UT" - 2018 PW7


MPEC 2018-P21 - "10:39 UT" - 2018 PV7


MPEC 2018-P20 - "03:00 UT" - 2018 PU7


MPEC 2018-P19 - "02:57 UT" - 2018 PT7


MPEC 2018-P18 - "02:54 UT" - 2018 PS7

Observers  on 8 August '18

A total of 34 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 2 in MPECs 2018-P25 & 2018-P30 -- 2018 PL8, 2008 PW4
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPECs 2018-P19, 2018-P24, 2018-P25, 2018-P26, 2018-P28, 2018-P29 & 2018-P31 -- 2018 PY7, 2018 PT7, 2018 PK8, 2018 PJ8, 2018 PG8, 2018 PF8, 2018 NY14, 2018 NN4, 2018 NN, 2018 MW6, 2018 KV, 2018 JC3
T05ATLAS Haleakala in Hawaii, 19 in MPECs 2018-P24, 2018-P25 & 2018-P30 -- 2018 PY7, 2018 PL8, 2015 RB82, 2014 YR43, 2009 SK104, 1999 RV2, 99799, 89959, 54789, 513497, 326386, 25916, 17274, 162483, 137125, 6569, 5646, 1916, 1685
T08ATLAS Mauna Loa in Hawaii, 13 in MPECs 2018-P20 & 2018-P25 -- 2018 PU7, 2018 MM8, 2018 LZ5, 2013 EP41, 2011 GA62, 68950, 518635, 418929, 283729, 162168, 13553, 11500, 2061
160Castelmartini Obs. in Italy, 16 in MPEC 2018-P25 -- 2018 NB, 2018 MM8, 2018 GA5, 87311, 86878, 65996, 65706, 415029, 31345, 21277, 180186, 16834, 162168, 141527, 140039, 6456
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPECs 2018-P18, 2018-P19, 2018-P21, 2018-P25, 2018-P26, 2018-P27 & 2018-P29 -- 2018 PV7, 2018 PT7, 2018 PS7, 2018 PK8, 2018 PH8, 2018 PG8, 2018 OQ
850Cordell-Lorenz Obs. in Tennessee, 2 in MPECs 2018-P20 & 2018-P30 -- 2018 PU7, 2018 PL8
Z45Cosmos Obs., 1 in MPEC 2018-P25 -- 13553
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2018-P25 -- 2008 PW4
734Farpoint Obs. in Kansas, 1 in MPEC 2018-P21 -- 2018 PV7
X31Galilei Obs., 2 in MPECs 2018-P19 & 2018-P20 -- 2018 PU7, 2018 PT7
K88GINOP-KHK in Hungary, 1 in MPEC 2018-P20 -- 2018 PU7
J95Great Shefford Obs. in England, 1 in MPEC 2018-P20 -- 2018 PU7
A17Guidestar Obs. in Germany, 1 in MPEC 2018-P20 -- 2018 PU7
Q62iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-P25 -- 436774
Q62[M. Suzuki in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-P20 -- 2018 PU7
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 2 in MPECs 2018-P19 & 2018-P30 -- 2018 PT7, 2018 PL8
W85LCO Cerro Tololo A in Chile, 1 in MPEC 2018-P18 -- 2018 PS7
711McDonald Obs. in Texas, 9 in MPECs 2018-P22, 2018-P23, 2018-P24, 2018-P25, 2018-P27, 2018-P28, 2018-P30 & 2018-P31 -- 2018 PY7, 2018 PX7, 2018 PW7, 2018 PL8, 2018 PJ8, 2018 PH8, 2018 PF8, 2018 KF3, 2014 QE365
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-P20 -- 2018 PU7
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-P25 -- 461397
F51Pan-STARRS 1 (PS1) in Hawaii, 35 in MPECs 2018-P18, 2018-P19, 2018-P21, 2018-P22, 2018-P23, 2018-P25, 2018-P26, 2018-P27, 2018-P28, 2018-P29, 2018-P30 & 2018-P31 -- 2018 PX7, 2018 PW7, 2018 PV7, 2018 PT7, 2018 PS7, 2018 PL8, 2018 PK8, 2018 PJ8, 2018 PH8, 2018 PG8, 2018 PF8, 2018 AL13, 2017 WR13, 2017 VT12, 2017 QX34, 2014 QP363, 2014 ON344, 2014 HM187, 2013 QG17, 2006 KZ86, 2002 QQ40, 1999 RV2, 87025, 476438, 441641, 419880, 419464, 410088, 366774, 306367, 249595, 178601, 152895, 140158, 3352
K63Pascoli Obs. in Italy, 1 in MPEC 2018-P20 -- 2018 PU7
122Pises Obs. in France, 3 in MPEC 2018-P25 -- 2009 QJ9, 283729, 719
L04ROASTERR-1 in Romania, 2 in MPECs 2018-P20 & 2018-P25 -- 2018 PU7, 2012 OD1
247roving observer, 1 in MPEC 2018-P20 -- 2018 PU7
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2018-P20 -- 2018 PU7
C95SATINO-1 in France, 1 in MPEC 2018-P25 -- 2018 NH
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2018-P23 -- 2018 PX7
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2018-P18 & 2018-P31 -- 2018 PS7, 2018 PF8
W34Squirrel Valley Obs. in North Carolina, 2 in MPECs 2018-P20 & 2018-P25 -- 2018 PU7, 31345
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2018-P25 -- 2018 PC
Z52The Studios Obs., 1 in MPEC 2018-P25 -- 13553
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 5 in MPEC 2018-P25 -- 2018 NM4, 2018 MC7, 2018 LO6, 2018 LM4, 2018 DH1
L01Visnjan Obs., 5 in MPECs 2018-P20, 2018-P22, 2018-P23, 2018-P24 & 2018-P30 -- 2018 PY7, 2018 PX7, 2018 PW7, 2018 PU7, 2018 PL8
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 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 PF8JPL Sentry23582028-2066132.6098e-09-5.42-5.990JPL: Computed at 16:53 today Pacific time based on 15 observations spanning 2.8707 days (2018-Aug-05.27535 to 2018-Aug-08.14606). Diameter approximately 0.371 km. from weighted mean H=19.81.
2018 PY7NEODyS17322097-2118363.0e-05-5.62-6.18-NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2018-08-05.562 to 2018-08-08.353."
JPL Sentry15482097-2115192.23121017e-05-5.75-6.440JPL: Computed at 05:01 today Pacific time based on 17 observations spanning 2.7915 days (2018-Aug-05.56103 to 2018-Aug-08.35251). Diameter approximately 0.016 km. from weighted mean H=26.65.
2018 PR7NEODyS15482097-211883.94e-05-6.59-6.59-NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2018-08-06.267 to 2018-08-07.896."
JPL Sentry00432097-211143.1594363e-05-6.67-6.670JPL: Computed at 17:04 Aug. 7th Pacific time based on 29 observations spanning 1.6295 days (2018-Aug-06.26605 to 2018-Aug-07.89556). Diameter approximately 0.006 km. from weighted mean H=28.65.
2018 MC7NEODyS17322060-2118806.45e-04-3.88-4.09-NEODyS: "Based on 44 optical observations (of which 1 are rejected as outliers) from 2018-06-21.395 to 2018-08-07.527."
JPL Sentry15482060-2109230.00134820164-3.52-3.530JPL: Computed at 08:32 today Pacific time based on 42 observations spanning 47.132 days (2018-Jun-21.39443 to 2018-Aug-07.526293). Diameter approximately 0.020 km. from weighted mean H=26.10.

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 8 August '18

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

2358Noted that JPL Sentry has posted 2018 PF8 as an impact risk - see above
2300Grabbed MPEC 2018-P26 - 2018 PG8 - see above
Grabbed MPEC 2018-P27 - 2018 PH8 - see above
Grabbed MPEC 2018-P28 - 2018 PJ8 - see above
Grabbed MPEC 2018-P29 - 2018 PK8 - see above
Grabbed MPEC 2018-P30 - 2018 PL8 - see above
Grabbed MPEC 2018-P31 - 2018 PF8 - see above
1811Generated Traffic Report
1732Noted that NEODyS has updated its 2018 MC7 risk assessment - see above
Noted that NEODyS has posted 2018 PY7 as an impact risk - see above
1548Noted that JPL Sentry has updated its 2018 MC7 risk assessment - see above
Noted that NEODyS has posted 2018 PR7 as an impact risk - see above
Noted that JPL Sentry has posted 2018 PY7 as an impact risk - see above
Grabbed MPEC 2018-P21 - 2018 PV7 - see above
Grabbed MPEC 2018-P22 - 2018 PW7 - see above
Grabbed MPEC 2018-P23 - 2018 PX7 - see above
Grabbed MPEC 2018-P24 - 2018 PY7 - see above
Grabbed MPEC 2018-P25 - Daily Orbit Update - see above
0332Grabbed MPEC 2018-P18 - 2018 PS7 - see above
Grabbed MPEC 2018-P19 - 2018 PT7 - see above
Grabbed MPEC 2018-P20 - 2018 PU7 - see above
0043Noted that JPL Sentry has posted 2018 PR7 as an impact risk - see above