Contents  on 20 September '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 20 September '18

Eleven objects reported inside ten LD

Eleven transient natural objects are known to be within ten lunar distances (LD) of Earth today. Nearest is 2018 RF8, which moves away from 3.04 to 6.41 LD.

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
0.11 LD Sept. 15 2018 SM 4 m  9.37 to 11.67 LD Sept. 11 - 20 intruder, exits ten LD
0.70 LD Sept. 18 2018 SC 9 m  4.40 to 7.51 LD Sept. 15 - 21 intruder
1.37 LD yesterday 2018 RF8 24 m  3.04 to 6.41 LD Sept. 16 - 22 Moon buzzer
1.66 LD Sept. 18 2018 SJ1 34 m  5.35 to 8.68 LD Sept. 15 - 21 NEW - MPEC
2.41 LD Sept. 17 2018 RK6 9 m  4.36 to 5.60 LD Sept. 10 - 24 NHATS target
3.54 LD Sept. 16 2018 RG8 15 m  5.95 to 7.26 LD Sept. 10 - 22
4.05 LD Sept. 18 2018 SC1 9 m  5.24 to 6.53 LD Sept. 13 - 23 NEW, risk - MPEC
4.06 LD Sept. 24 2018 RQ1 51 m  4.88 from 5.29 LD Sept. 11 - Oct. 8 NHATS target, risk
4.49 LD Sept. 16 2018 RG5 15 m  7.50 to 9.05 LD Sept. 11 - 21 NHATS target
8.50 LD today 2017 SL16 23 m  8.50 LD Sept. 17 - 24 NHATS target, Earth closest at 2108 UTC
8.57 LD Sept. 22 2018 RH6 11 m  8.92 from 9.39 LD yesterday - Sept. 26 NHATS target
Approaching Traffic
6.80 LD Sept. 27 2018 SM1 89 m  10.52 from 11.49 LD tomorrow - Oct. 3 NEW - MPEC

This report was generated at 2351 UTC with five discoveries: approaching 2018 SM1 (MPEC), outbound objects 2018 SJ1 (MPEC) and risk-listed 2018 SC1 (MPEC), and already departed objects 2018 SL1 (MPEC), which passed us at 9.48 LD on September 16th, and 2018 SD1 (MPEC, DOU), which slipped by at 8.23 LD on the 17th. Today's DOU MPEC has follow-up for departed objects 2018 RB6, 2018 RO5, 2018 RD5, and 2015 SW6.



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 20 September '18

The MPC's NEO Confirmation Page has 10 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had ten objects listed. Of these, five were "one nighters." The Tracking News counted a total of 33 listings on the NEOCP on this day.

New MPECs  on 20 September '18

Minor Planet Electronic Circulars

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


MPEC 2018-S49 - "21:17 UT" - 2018 SL1


MPEC 2018-S48 - "21:13 UT" - 2018 SJ1


MPEC 2018-S47 - "20:16 UT" - 2018 SM1


MPEC 2018-S46 - "20:12 UT" - 2018 SK1


<< DOU on 20 Sept. '18 >>  MPEC 2018-S45 - "12:06 UT" - Daily Orbit Update


MPEC 2018-S44 - "00:59 UT" - 2018 SD1


MPEC 2018-S43 - "00:56 UT" - 2018 SC1


MPEC 2018-S42 - "00:51 UT" - 2018 SB1


MPEC 2018-S41 - "00:48 UT" - 2018 SA1


MPEC 2018-S40 - "00:43 UT" - 2018 SZ

Observers  on 20 September '18

A total of 44 observers appeared in this day's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-S45 -- 2015 SW6
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2018-S40, 2018-S42, 2018-S43, 2018-S45, 2018-S46, 2018-S47 & 2018-S49 -- 2018 SZ, 2018 SM1, 2018 SL1, 2018 SK1, 2018 SC1, 2018 SB1, 2015 SW6
T05ATLAS Haleakala in Hawaii, 9 in MPECs 2018-S44, 2018-S45 & 2018-S47 -- 2018 SM1, 2018 SD1, 2018 RP8, 2018 RO8, 65996, 54401, 442742, 369986, 16834
T08ATLAS Mauna Loa in Hawaii, 13 in MPEC 2018-S45 -- 2018 RX, 443923, 438429, 369986, 333889, 31345, 250697, 17511, 17274, 162168, 9856, 6456, 5751
C77Bernezzo Obs. in Italy, 1 in MPEC 2018-S47 -- 2018 SM1
160Castelmartini Obs. in Italy, 8 in MPECs 2018-S45 & 2018-S47 -- 2018 SM1, 2018 RM, 2018 QT, 2015 SW6, 2015 RJ83, 2011 UA, 1999 RB32, 457260
703Catalina Sky Survey (CSS) in Arizona, 3 in MPECs 2018-S43 & 2018-S45 -- 2018 SC1, 2015 SW6, 369986
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2018-S40 -- 2018 SZ
K51Celado Obs. in Italy, 3 in MPECs 2018-S47, 2018-S48 & 2018-S49 -- 2018 SM1, 2018 SL1, 2018 SJ1
850Cordell-Lorenz Obs. in Tennessee, 3 in MPECs 2018-S44, 2018-S45 & 2018-S47 -- 2018 SM1, 2018 SD1, 2018 RX
113Drebach Obs. in Germany, 1 in MPEC 2018-S47 -- 2018 SM1
J27El Guijo Obs. in Spain, 1 in MPEC 2018-S47 -- 2018 SM1
734Farpoint Obs. in Kansas, 1 in MPEC 2018-S45 -- 369986
595Farra d'Isonzo Obs. in Italy, 3 in MPECs 2018-S43, 2018-S44 & 2018-S48 -- 2018 SJ1, 2018 SD1, 2018 SC1
K88GINOP-KHK in Hungary, 4 in MPECs 2018-S44, 2018-S45, 2018-S47 & 2018-S48 -- 2018 SM1, 2018 SJ1, 2018 SD1, 2015 SW6
J95Great Shefford Obs. in England, 2 in MPECs 2018-S45 & 2018-S48 -- 2018 SJ1, 2015 SW6
A17Guidestar Obs. in Germany, 7 in MPECs 2018-S44, 2018-S45 & 2018-S47 -- 2018 SM1, 2018 SD1, 2018 RW3, 2018 RO5, 2018 QT, 2018 PK22, 2015 SW6
W19Kalamazoo Obs. in Michigan, 1 in MPEC 2018-S45 -- 13553
585Kiev Comet Station in Ukraine, 2 in MPECs 2018-S44 & 2018-S45 -- 2018 SD1, 2015 SW6
Z43Landehen Obs., 1 in MPEC 2018-S45 -- 2018 RP8
932McCarthy Obs. in Connecticut, 1 in MPEC 2018-S47 -- 2018 SM1
711McDonald Obs. in Texas, 1 in MPEC 2018-S45 -- 2015 SW6
118Modra Obs. in Slovakia, 1 in MPEC 2018-S47 -- 2018 SM1
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2018-S40, 2018-S41, 2018-S42, 2018-S45 & 2018-S46 -- 2018 SZ, 2018 SK1, 2018 SB1, 2018 SA1, 369986
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2018-S47 -- 2018 SM1
C47Nonndorf Obs. in Austria, 1 in MPEC 2018-S44 -- 2018 SD1
G34Oberfrauendorf Obs. in Germany, 3 in MPECs 2018-S44, 2018-S45 & 2018-S47 -- 2018 SM1, 2018 SD1, 17274
I41Palomar Transient Factory (PTF) in southern California, 8 in MPECs 2018-S44, 2018-S45, 2018-S46, 2018-S48 & 2018-S49 -- 2018 SL1, 2018 SK1, 2018 SJ1, 2018 SD1, 2018 LZ5, 68359, 256412, 6456
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-S47 -- 2018 SM1
F52Pan-STARRS 2 (PS2) in Hawaii, 6 in MPEC 2018-S45 -- 2018 PS23, 2014 SK260, 250697, 226198, 138815, 115052
K63Pascoli Obs. in Italy, 2 in MPECs 2018-S44 & 2018-S47 -- 2018 SM1, 2018 SD1
L04ROASTERR-1 in Romania, 3 in MPECs 2018-S44, 2018-S47 & 2018-S48 -- 2018 SM1, 2018 SJ1, 2018 SD1
B04Saint-Barthelemy Obs. in Italy, 1 in MPEC 2018-S45 -- 2018 RB6
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2018-S45 -- 2015 SW6
C95SATINO-1 in France, 2 in MPEC 2018-S45 -- 2018 RD5, 2015 SW6
204Schiaparelli Obs. in Italy, 3 in MPECs 2018-S44, 2018-S46 & 2018-S47 -- 2018 SM1, 2018 SK1, 2018 SD1
033Schwarzschild Obs. in Germany, 1 in MPEC 2018-S45 -- 2015 SW6
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2018-S46 -- 2018 SK1
W34Squirrel Valley Obs. in North Carolina, 3 in MPECs 2018-S44, 2018-S45 & 2018-S47 -- 2018 SM1, 2018 SD1, 504800
I52Steward Obs. Mt. Lemmon Station in Arizona, 6 in MPECs 2018-S40, 2018-S41, 2018-S42, 2018-S43, 2018-S45 & 2018-S46 -- 2018 SZ, 2018 SK1, 2018 SC1, 2018 SB1, 2018 SA1, 2015 SW6
673!Jana Pittichova Chesley via Table Mtn. Obs. in southern California, 1 in MPEC 2018-S47 -- 2018 SM1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2018-S45 -- 2018 PU10, 2009 TK, 337252
L01Visnjan Obs., 9 in MPECs 2018-S40, 2018-S41, 2018-S42, 2018-S43, 2018-S44, 2018-S45, 2018-S46 & 2018-S47 -- 2018 SZ, 2018 SM1, 2018 SK1, 2018 SD1, 2018 SC1, 2018 SB1, 2018 SA1, 2018 RX, 2015 SW6
718Wiggins Obs. in Utah, 1 in MPEC 2018-S47 -- 2018 SM1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 September '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 SC1NEODyS1530209922.45e-06-7.27-7.520NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2018-09-18.229 to 2018-09-19.380."
JPL Sentry03112099-209923.3887e-06-7.12-7.160JPL: Computed at 18:57 Sept. 19th Pacific time based on 18 observations spanning 1.1515 days (2018-Sep-18.22771 to 2018-Sep-19.379222). Diameter approximately 0.009 km. from weighted mean H=27.77.
2018 RQ1NEODyS1530211724.44e-07-6.47-6.620NEODyS: "Based on 103 optical observations (of which 1 are rejected as outliers) from 2018-09-07.381 to 2018-09-18.624."
2015 HV182JPL Sentry03112018-21011901.943959e-07-4.61-5.780JPL: Computed at 13:25 April 6th of 2017 Pacific time based on 9 observations spanning .99953 days (2015-Apr-18.27618 to 2015-Apr-19.27571). Diameter approximately 0.157 km. from weighted mean H=21.70.

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 20 September '18

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

2351Generated Traffic Report
2118Grabbed MPEC 2018-S48 - 2018 SJ1 - see above
Grabbed MPEC 2018-S49 - 2018 SL1 - see above
2036Grabbed MPEC 2018-S47 - 2018 SM1 - see above
2013Grabbed MPEC 2018-S46 - 2018 SK1 - see above
1530Noted that NEODyS has updated its 2018 RQ1 risk assessment - see above
Noted that NEODyS has posted 2018 SC1 as an impact risk - see above
Grabbed MPEC 2018-S45 - Daily Orbit Update - see above
0311Noted that JPL Sentry has updated its 2015 HV182 risk assessment - see above
Noted that JPL Sentry has posted 2018 SC1 as an impact risk - see above
Grabbed MPEC 2018-S40 - 2018 SZ - see above
Grabbed MPEC 2018-S41 - 2018 SA1 - see above
Grabbed MPEC 2018-S42 - 2018 SB1 - see above
Grabbed MPEC 2018-S43 - 2018 SC1 - see above
Grabbed MPEC 2018-S44 - 2018 SD1 - see above