Contents  on 16 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 16 August '18

Five objects reported inside ten LD

Bulletin - 2236 UTC:  One new discovery of a close passer has been announced.

Earth passageI D~Size~Inside ten LDNotes
~5.8 LD ~today2018 PT2341 m Aug. 14 - 19MPEC


There are five asteroidal objects known to be within ten lunar distances (LD) of Earth today. Nearest is newly announced 2018 PN22, which is outbound from 7.20 to 7.49 LD, while 2018 PM20 comes its closest to our planet on this passage -- 8.02 LD at 1910 UTC.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 2.41 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
1.36 LD Aug. 6 2018 PR7 7 m  9.60 to 10.56 LD July 26 - today NHATS target, exits ten LD, risk
6.21 LD Aug. 9 2018 PN22 11 m  7.20 to 7.49 LD July 25 - Aug. 23 NEW, NHATS target - MPEC
7.86 LD Aug. 18 2018 PK20 22 m  8.52 from 9.39 LD yesterday - Aug. 22 NHATS target
8.02 LD today 2018 PM20 18 m  8.02 LD Aug. 13 - 19 Earth closest at 1910 UTC
8.84 LD Aug. 18 2018 PO22 82 m  9.46 from 10.60 LD today - Aug. 20 NEW, enters ten LD - MPEC
Approaching Traffic - sorted by 10-LD bubble entry date
9.36 LD Aug. 27 2018 LQ2 37 m  10.01 from 10.13 LD tomorrow - Sept. 6 NHATS target
4.22 LD Aug. 29 1998 SD9 49 m  30.04 from 32.47 LD Aug. 25 - Sept. 2

This report was generated at 1714 UTC with the discoveries of inbound 2018 PO22 (MPEC) and outbound 2018 PN22 (MPEC).



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 16 August '18

Radar observation of three 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 2332 UTC when the database was dated 16 Aug.


Data update noted at 2359 UTC when the database was dated 16 Aug.

NEOCP Activity  on 16 August '18

The MPC's NEO Confirmation Page has 48 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 48 objects listed. Of these, thirteen were "one nighters." The Tracking News counted a total of 94 listings on the NEOCP on this day.

New MPECs  on 16 August '18

Minor Planet Electronic Circulars

There were 21 MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2018-Q21 - "22:12 UT" - 2018 PT23


MPEC 2018-Q20 - "22:09 UT" - 2018 PS23


MPEC 2018-Q19 - "22:04 UT" - 2018 PR23


MPEC 2018-Q18 - "22:00 UT" - 2018 PQ23


MPEC 2018-Q17 - "21:56 UT" - 2018 PP23


MPEC 2018-Q16 - "18:49 UT" - 2018 CZ2


MPEC 2018-Q15 - "18:45 UT" - 2017 QG33


MPEC 2018-Q14 - "14:21 UT" - 2018 PN23


MPEC 2018-Q13 - "14:16 UT" - 2018 PM23


MPEC 2018-Q12 - "14:11 UT" - 2018 PL23


<< DOU on 16 Aug. '18 >>  MPEC 2018-Q11 - "12:04 UT" - Daily Orbit Update

No observations of objects are reported.


MPEC 2018-Q10 - "01:55 UT" - 2018 PO22


MPEC 2018-Q09 - "01:51 UT" - 2018 PN22


MPEC 2018-Q08 - "01:48 UT" - 2018 PJ22


MPEC 2018-Q07 - "01:45 UT" - 2018 PM22


MPEC 2018-Q06 - "01:42 UT" - 2018 PL22


MPEC 2018-Q05 - "01:39 UT" - 2018 PK22


MPEC 2018-Q04 - "01:36 UT" - 2018 PH22


MPEC 2018-Q03 - "01:31 UT" - 2018 PG22


MPEC 2018-Q02 - "01:22 UT" - 2018 PF22


MPEC 2018-Q01 - "01:18 UT" - 2018 PE22

Observers  on 16 August '18

A total of 31 observers appeared in this day's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-Q05 -- 2018 PK22
251Arecibo in Puerto Rico, 3 in radar -- 2018 LK, 2017 YE5, 2015 DP155
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPECs 2018-Q01, 2018-Q02, 2018-Q03, 2018-Q04, 2018-Q06, 2018-Q07, 2018-Q08, 2018-Q12, 2018-Q13, 2018-Q14, 2018-Q17 & 2018-Q19 -- 2018 PR23, 2018 PP23, 2018 PN23, 2018 PM23, 2018 PM22, 2018 PL23, 2018 PL22, 2018 PJ22, 2018 PH22, 2018 PG22, 2018 PF22, 2018 PE22
T08ATLAS Mauna Loa in Hawaii, 2 in MPECs 2018-Q05 & 2018-Q10 -- 2018 PO22, 2018 PK22
160Castelmartini Obs. in Italy, 1 in MPEC 2018-Q10 -- 2018 PO22
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPECs 2018-Q01, 2018-Q12, 2018-Q14, 2018-Q17, 2018-Q19 & 2018-Q20 -- 2018 PS23, 2018 PR23, 2018 PP23, 2018 PN23, 2018 PL23, 2018 PE22
K65Cesena Obs. in Italy, 1 in MPEC 2018-Q08 -- 2018 PJ22
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2018-Q08 -- 2018 PJ22
L29Drebach-South Obs., 1 in MPEC 2018-Q05 -- 2018 PK22
151Eschenberg Obs. in Switzerland, 1 in MPEC 2018-Q08 -- 2018 PJ22
734Farpoint Obs. in Kansas, 3 in MPECs 2018-Q01, 2018-Q13 & 2018-Q20 -- 2018 PS23, 2018 PM23, 2018 PE22
253Goldstone DSS-14 70m antenna in southern California, 3 in radar -- 2018 LK, 2017 YE5, 2015 DP155
J95Great Shefford Obs. in England, 3 in MPECs 2018-Q08, 2018-Q10 & 2018-Q21 -- 2018 PT23, 2018 PO22, 2018 PJ22
A17Guidestar Obs. in Germany, 1 in MPEC 2018-Q08 -- 2018 PJ22
Q62[M. Suzuki in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-Q05 -- 2018 PK22
568_Marco Micheli on Mauna Kea in Hawaii, 4 in MPECs 2018-Q03, 2018-Q06, 2018-Q09 & 2018-Q13 -- 2018 PN22, 2018 PM23, 2018 PL22, 2018 PG22
118Modra Obs. in Slovakia, 1 in MPEC 2018-Q08 -- 2018 PJ22
W76MPC code W76, 1 in MPEC 2018-Q05 -- 2018 PK22
I41Palomar Transient Factory (PTF) in southern California, 2 in MPECs 2018-Q08 & 2018-Q21 -- 2018 PT23, 2018 PJ22
F51Pan-STARRS 1 (PS1) in Hawaii, 13 in MPECs 2018-Q01, 2018-Q03, 2018-Q04, 2018-Q06, 2018-Q07, 2018-Q09, 2018-Q12, 2018-Q13, 2018-Q14, 2018-Q17, 2018-Q18, 2018-Q19 & 2018-Q20 -- 2018 PS23, 2018 PR23, 2018 PQ23, 2018 PP23, 2018 PN23, 2018 PN22, 2018 PM23, 2018 PM22, 2018 PL23, 2018 PL22, 2018 PH22, 2018 PG22, 2018 PE22
104San Marcello Pistoiese Obs. in Italy, 4 in MPECs 2018-Q02, 2018-Q08, 2018-Q09 & 2018-Q10 -- 2018 PO22, 2018 PN22, 2018 PJ22, 2018 PF22
679San Pedro Martir Obs. in Mexico, 1 in MPEC 2018-Q18 -- 2018 PQ23
C95SATINO-1 in France, 2 in MPECs 2018-Q08 & 2018-Q10 -- 2018 PO22, 2018 PJ22
204Schiaparelli Obs. in Italy, 4 in MPECs 2018-Q02, 2018-Q03, 2018-Q04 & 2018-Q10 -- 2018 PO22, 2018 PH22, 2018 PG22, 2018 PF22
W88#program code "#" (12) via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-Q05 -- 2018 PK22
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2018-Q04 -- 2018 PH22
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2018-Q02, 2018-Q03 & 2018-Q12 -- 2018 PL23, 2018 PG22, 2018 PF22
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPECs 2018-Q02, 2018-Q15 & 2018-Q16 -- 2018 PF22, 2018 CZ2, 2017 QG33
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2018-Q16 -- 2018 CZ2
L01Visnjan Obs., 9 in MPECs 2018-Q02, 2018-Q04, 2018-Q06, 2018-Q07, 2018-Q08, 2018-Q09, 2018-Q10, 2018-Q13 & 2018-Q18 -- 2018 PQ23, 2018 PO22, 2018 PN22, 2018 PM23, 2018 PM22, 2018 PL22, 2018 PJ22, 2018 PH22, 2018 PF22
C51WISE in Earth polar orbit, 1 in MPEC 2018-Q02 -- 2018 PF22
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 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 PZ21NEODyS19502045-2115428.43e-05-5.04-5.30NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2018-08-12.369 to 2018-08-15.086."

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 16 August '18

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

2359Noted Radar Astrometry database update - see above
2332Noted Radar Astrometry database update - see above
2232Grabbed MPEC 2018-Q17 - 2018 PP23 - see above
Grabbed MPEC 2018-Q18 - 2018 PQ23 - see above
Grabbed MPEC 2018-Q19 - 2018 PR23 - see above
Grabbed MPEC 2018-Q20 - 2018 PS23 - see above
Grabbed MPEC 2018-Q21 - 2018 PT23 - see above
1950Noted that NEODyS has posted 2018 PZ21 as an impact risk - see above
Grabbed MPEC 2018-Q15 - 2017 QG33 - see above
Grabbed MPEC 2018-Q16 - 2018 CZ2 - see above
1714Generated Traffic Report
1500Grabbed MPEC 2018-Q11 - Daily Orbit Update - see above
Grabbed MPEC 2018-Q12 - 2018 PL23 - see above
Grabbed MPEC 2018-Q13 - 2018 PM23 - see above
Grabbed MPEC 2018-Q14 - 2018 PN23 - see above
0330Grabbed MPEC 2018-Q01 - 2018 PE22 - see above
Grabbed MPEC 2018-Q02 - 2018 PF22 - see above
Grabbed MPEC 2018-Q03 - 2018 PG22 - see above
Grabbed MPEC 2018-Q04 - 2018 PH22 - see above
Grabbed MPEC 2018-Q05 - 2018 PK22 - see above
Grabbed MPEC 2018-Q06 - 2018 PL22 - see above
Grabbed MPEC 2018-Q07 - 2018 PM22 - see above
Grabbed MPEC 2018-Q08 - 2018 PJ22 - see above
Grabbed MPEC 2018-Q09 - 2018 PN22 - see above
Grabbed MPEC 2018-Q10 - 2018 PO22 - see above