Contents  on 18 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 18 September '18

Sixteen objects reported inside ten LD

Sixteen visitors are reported moving inside ten lunar distances (LD) of our planet today. Nearest is newly announced intruder 2018 SC, which comes in from 2.05 LD, through the Earth-Moon system and out to 1.40 LD, passing the Earth at 0.70 LD. Meanwhile, 2018 RF8 flits in from 4.59 to 1.60 LD, entering Earth's sphere of gravitational influence.

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  4.77 to 7.07 LD Sept. 11 - 20 NEW, intruder - MPEC
0.58 LD Sept. 9 2018 RC 36 m  9.66 to 10.79 LD Aug. 31 - today intruder, NHATS target, exits ten LD
0.70 LD today 2018 SC 9 m  0.70 LD Sept. 15 - 21 NEW, intruder today, Moon closest 1.23 LD at
1256 UTC, Earth closest at 1445 UTC - MPEC
1.23 LD Sept. 13 2018 RE8 13 m  9.19 to 11.43 LD Sept. 9 - 18 exits ten LD
1.37 LD tomorrow 2018 RF8 24 m  1.60 from 4.59 LD Sept. 16 - 22 Moon buzzer, enters Earth SOI - DOU
1.48 LD Sept. 15 2018 RE5 11 m  9.89 to 13.31 LD Sept. 12 - 18 Moon buzzer, exits ten LD
1.52 LD Sept. 16 2018 RB6 23 m  5.66 to 8.63 LD Sept. 12 - 19 DOU
2.03 LD Sept. 16 2018 RN7 11 m  5.51 to 9.49 LD Sept. 14 - 19
2.41 LD yesterday 2018 RK6 9 m  2.54 to 3.28 LD Sept. 10 - 24 NHATS target
2.78 LD yesterday 2018 RM7 8 m  4.12 to 7.49 LD Sept. 14 - 19
3.54 LD Sept. 16 2018 RG8 15 m  3.91 to 4.78 LD Sept. 10 - 22 DOU
4.06 LD Sept. 24 2018 RQ1 51 m  5.75 from 6.26 LD Sept. 11 - Oct. 8 NHATS target, risk
4.39 LD Sept. 12 2018 RD5 23 m  9.62 to 10.94 LD Sept. 5 - 18 NHATS target, exits ten LD - DOU
4.49 LD Sept. 16 2018 RG5 15 m  5.04 to 6.11 LD Sept. 11 - 21 NHATS target - DOU
8.00 LD Sept. 16 2018 RA2 27 m  8.39 to 9.24 LD Sept. 13 - 19 NHATS target
8.50 LD Sept. 20 2017 SL16 23 m  8.92 from 9.45 LD yesterday - Sept. 24 NHATS target
Approaching Traffic
8.57 LD Sept. 22 2018 RH6 11 m  10.01 from 10.78 LD tomorrow - Sept. 26 NHATS target - DOU

This report was generated at 2010 UTC with the discoveries of two intruders: 2018 SC (MPEC) comes its closest today and 2018 SM (MPEC) came to 0.111 LD (and 0.73 LD from the Moon) on September 15th. Today's DOU MPEC has follow-up for six objects in the active traffic table and for ten departed objects: 2018 RR5, 2018 RO5, 2018 RZ, 2018 PO22, 2018 LQ2, 2015 SW6, and including four risk-listed: 2018 RP5, 2018 RF5, 2018 RB2, and intruder 2018 RR1.



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 18 September '18

The MPC's NEO Confirmation Page has 24 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 24 objects listed. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 49 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 18 September '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-S38 - "16:51 UT" - Comet C/2018 R5 (Lemmon)


MPEC 2018-S37 - "16:34 UT" - 2018 PL28


MPEC 2018-S36 - "16:07 UT" - 2018 SN


MPEC 2018-S35 - "16:03 UT" - 2018 SM


MPEC 2018-S34 - "15:59 UT" - 2018 SK


MPEC 2018-S33 - "15:55 UT" - 2018 RR8


MPEC 2018-S32 - "15:39 UT" - 2018 SL


MPEC 2018-S31 - "14:26 UT" - Comet P/2007 V1 = 2018 S1 (Larson)


<< DOU on 18 Sept. '18 >>  MPEC 2018-S30 - "12:07 UT" - Daily Orbit Update


MPEC 2018-S29 - "11:36 UT" - 2016 UA


MPEC 2018-S28 - "11:34 UT" - 2015 ED7


MPEC 2018-S27 - "10:32 UT" - 2018 SC


MPEC 2018-S26 - "02:52 UT" - 2018 SB


MPEC 2018-S25 - "02:49 UT" - 2018 RP8

Observers  on 18 September '18

A total of 65 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 14 in MPEC 2018-S30 -- 518635, 438429, 418929, 358744, 31345, 18109, 17511, 17274, 162168, 13553, 12711, 115052, 6456, 1627
H21Astronomical Research Obs. Westfield in Illinois, 24 in MPECs 2018-S25, 2018-S30 & 2018-S33 -- 2018 RZ2, 2018 RZ, 2018 RY, 2018 RX1, 2018 RV1, 2018 RS1, 2018 RR8, 2018 RR1, 2018 RP8, 2018 RM2, 2018 RL2, 2018 RD1, 2018 RC1, 2018 RB2, 2018 QU, 2018 QR, 2018 PK21, 2018 PJ9, 2018 PJ10, 2018 NR, 2018 NO4, 2018 NO1, 2018 NN, 2018 LZ5
T05ATLAS Haleakala in Hawaii, 45 in MPECs 2018-S25, 2018-S27 & 2018-S30 -- 2018 SC, 2018 RX, 2018 RR5, 2018 RQ5, 2018 RP8, 2018 RD7, 2018 RD5, 2018 QV1, 2018 PE22, 2018 NB, 2018 LQ2, 2018 KR2, 2015 SW6, 2015 RJ83, 2013 EP41, 2012 UV27, 2008 RT26, 2007 RX19, 2005 RB, 2001 SC170, 2001 RQ17, 443923, 438429, 350988, 337252, 337248, 333889, 31345, 267729, 253062, 250697, 250162, 18109, 17511, 17274, 162168, 140039, 13553, 12711, 11500, 9856, 6456, 5751, 4183, 2100
T08ATLAS Mauna Loa in Hawaii, 10 in MPEC 2018-S30 -- 2002 OS4, 2001 QA143, 1999 RB32, 88263, 504800, 413260, 16834, 3552, 3200, 433
C77Bernezzo Obs. in Italy, 2 in MPECs 2018-S25 & 2018-S38 -- 2018 RP8, C/2018 R5
215Buchloe Obs. in Germany, 1 in MPEC 2018-S38 -- C/2018 R5
U63Burnt Tree Hill Obs., 1 in MPEC 2018-S25 -- 2018 RP8
703Catalina Sky Survey (CSS) in Arizona, 13 in MPECs 2018-S25, 2018-S30 & 2018-S35 -- 2018 SM, 2018 RP8, 2018 RO7, 2017 SN14, 2001 QA143, 1999 RB32, 66008, 454177, 413563, 16834, 159495, 115052, 3691
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 7 in MPECs 2018-S30, 2018-S35 & 2018-S37 -- 2018 SM, 2018 RV7, 2018 RF5, 2018 RC6, 2018 PL28, 2018 GW3, 2017 KE35
K51Celado Obs. in Italy, 1 in MPEC 2018-S25 -- 2018 RP8
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2018-S28, 2018-S30 & 2018-S37 -- 2018 RP2, 2018 PO22, 2018 PL28, 2015 ED7
850Cordell-Lorenz Obs. in Tennessee, 2 in MPECs 2018-S30 & 2018-S38 -- C/2018 R5, 2015 SW6
U82CS3 Palmer Divide Station in southern California, 1 in MPEC 2018-S30 -- 2001 QA143
113Drebach Obs. in Germany, 1 in MPEC 2018-S38 -- C/2018 R5
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2018-S37 -- 2018 PL28
151Eschenberg Obs. in Switzerland, 4 in MPECs 2018-S26, 2018-S30 & 2018-S38 -- 2018 SB, 2018 RF8, C/2018 R5, 2018 KE3
734Farpoint Obs. in Kansas, 3 in MPECs 2018-S26, 2018-S34 & 2018-S37 -- 2018 SK, 2018 SB, 2018 PL28
595Farra d'Isonzo Obs. in Italy, 4 in MPECs 2018-S25, 2018-S26, 2018-S27 & 2018-S38 -- 2018 SC, 2018 SB, 2018 RP8, C/2018 R5
K88GINOP-KHK in Hungary, 7 in MPECs 2018-S25, 2018-S26, 2018-S27, 2018-S30, 2018-S33, 2018-S37 & 2018-S38 -- 2018 SC, 2018 SB, 2018 RR8, 2018 RP8, 2018 RG8, C/2018 R5, 2018 PL28
J95Great Shefford Obs. in England, 2 in MPECs 2018-S26 & 2018-S27 -- 2018 SC, 2018 SB
A17Guidestar Obs. in Germany, 3 in MPECs 2018-S25, 2018-S26 & 2018-S38 -- 2018 SB, 2018 RP8, C/2018 R5
U695Hidetaka Sato in Japan via iTelescope Obs. Auberry in northern California, 1 in MPEC 2018-S38 -- C/2018 R5
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-S25 -- 2018 RP8
Q62iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-S37 -- 2018 PL28
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-S37 -- 2018 PL28
585Kiev Comet Station in Ukraine, 2 in MPECs 2018-S25 & 2018-S38 -- 2018 RP8, C/2018 R5
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2018-S37 -- 2018 PL28
246KLENOT in the Czech Republic, 1 in MPEC 2018-S38 -- C/2018 R5
950.EURONEAR via La Palma in the Canary Islands, 1 in MPEC 2018-S30 -- 2018 KF3
Z43Landehen Obs., 1 in MPEC 2018-S30 -- 481394
K38M57 Obs. in Italy, 1 in MPEC 2018-S38 -- C/2018 R5
C10Maisoncelles Obs. in France, 1 in MPEC 2018-S38 -- C/2018 R5
Z22MASTER IAC Obs. in the Canary Islands, 2 in MPEC 2018-S30 -- 2011 GA62, 1865
C41MASTER-II Kislovodsk in Russia, 1 in MPEC 2018-S30 -- 138095
711McDonald Obs. in Texas, 2 in MPECs 2018-S37 & 2018-S38 -- C/2018 R5, 2018 PL28
B67Mirasteilas Obs. in Switzerland, 5 in MPEC 2018-S30 -- 2018 KE3, 2012 UV27, 2011 UA, 2011 GA62, 2006 OT9
118Modra Obs. in Slovakia, 2 in MPECs 2018-S25 & 2018-S38 -- 2018 RP8, C/2018 R5
G96Mt. Lemmon Survey (MLS) in Arizona, 19 in MPECs 2018-S30, 2018-S32, 2018-S33, 2018-S34, 2018-S36, 2018-S37 & 2018-S38 -- 2018 SN, 2018 SL, 2018 SK, 2018 RR8, C/2018 R5, 2018 PL28, 2016 TZ56, 2016 RP1, 2016 RO1, 2015 UC67, 2001 FF90, 88263, 65996, 52762, 504800, 457212, 413260, 153195, 140288
C47Nonndorf Obs. in Austria, 1 in MPEC 2018-S38 -- C/2018 R5
J69North Obs. in England, 1 in MPEC 2018-S27 -- 2018 SC
Z80Northolt Branch Obs. in England, 2 in MPECs 2018-S25 & 2018-S27 -- 2018 SC, 2018 RP8
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2018-S25 -- 2018 RP8
C23Olmen Obs. in Belgium, 1 in MPEC 2018-S38 -- C/2018 R5
I41Palomar Transient Factory (PTF) in southern California, 11 in MPECs 2018-S26, 2018-S30 & 2018-S35 -- 2018 SM, 2018 SB, 2018 RX, 2018 RL2, 2015 RJ83, 2001 SK276, 85804, 422977, 337252, 250162, 4401
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2018-S37 & 2018-S38 -- C/2018 R5, 2018 PL28
K63Pascoli Obs. in Italy, 3 in MPECs 2018-S26, 2018-S37 & 2018-S38 -- 2018 SB, C/2018 R5, 2018 PL28
K81PMPHR Obs., 1 in MPEC 2018-S30 -- 418929
L04ROASTERR-1 in Romania, 3 in MPECs 2018-S25, 2018-S26 & 2018-S27 -- 2018 SC, 2018 SB, 2018 RP8
K61Rokycany Obs. in the Czech Republic, 2 in MPECs 2018-S25 & 2018-S38 -- 2018 RP8, C/2018 R5
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2018-S25, 2018-S33 & 2018-S38 -- 2018 RR8, 2018 RP8, C/2018 R5
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-S38 -- C/2018 R5
C95SATINO-1 in France, 3 in MPECs 2018-S27, 2018-S30 & 2018-S38 -- 2018 SC, C/2018 R5, 11500
204Schiaparelli Obs. in Italy, 4 in MPEC 2018-S30 -- 2018 RX5, 2018 RF6, 2018 RB6, 2018 RA3
033Schwarzschild Obs. in Germany, 3 in MPECs 2018-S25, 2018-S33 & 2018-S37 -- 2018 RR8, 2018 RP8, 2018 PL28
G40"G. Gasparovic in Croatia via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-S38 -- C/2018 R5
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-S38 -- C/2018 R5
691Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2018-S30 & 2018-S37 -- 2018 RX, 2018 PU10, 2018 PL9, 2018 PL28, 4015
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2018-S30 & 2018-S37 -- 2018 RQ4, 2018 RP5, 2018 RL7, 2018 RH6, 2018 PL28, 2018 GJ1, 2017 WG2, 2017 HW1, 2014 SM143
W34Squirrel Valley Obs. in North Carolina, 2 in MPECs 2018-S25 & 2018-S30 -- 2018 RP8, 481394
I52Steward Obs. Mt. Lemmon Station in Arizona, 34 in MPECs 2018-S25, 2018-S26, 2018-S27, 2018-S30, 2018-S32, 2018-S33, 2018-S34, 2018-S35, 2018-S36, 2018-S37 & 2018-S38 -- 2018 SN, 2018 SM, 2018 SL, 2018 SK, 2018 SC, 2018 SB, 2018 RZ6, 2018 RY7, 2018 RY, 2018 RX7, 2018 RV5, 2018 RU7, 2018 RU3, 2018 RS5, 2018 RR8, 2018 RR5, 2018 RQ5, 2018 RP8, 2018 RO5, 2018 RL7, 2018 RK7, 2018 RJ7, 2018 RH6, 2018 RH5, 2018 RG5, 2018 RF8, 2018 RD8, 2018 RD7, 2018 RC8, 2018 RB8, 2018 RA8, 2018 RA5, C/2018 R5, 2018 PL28
A71Stixendorf Obs. in Austria, 1 in MPEC 2018-S38 -- C/2018 R5
461SZTE Asteroid Program in Hungary, 1 in MPEC 2018-S31 -- P/2018 S1
Z52The Studios Obs., 2 in MPEC 2018-S30 -- 13553, 6456
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 5 in MPECs 2018-S29 & 2018-S30 -- 2018 RN, 2018 QT, 2016 UA, 2008 TY3, 446924
L01Visnjan Obs., 7 in MPECs 2018-S25, 2018-S26, 2018-S27, 2018-S33, 2018-S36, 2018-S37 & 2018-S38 -- 2018 SN, 2018 SC, 2018 SB, 2018 RR8, 2018 RP8, C/2018 R5, 2018 PL28
718Wiggins Obs. in Utah, 3 in MPECs 2018-S25, 2018-S27 & 2018-S30 -- 2018 SC, 2018 RP8, 2018 RF8
C51WISE in Earth polar orbit, 1 in MPEC 2018-S30 -- 1627
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 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 RJ7JPL Sentry16012057-207124.989e-09-6.36-6.540JPL: Computed at 08:35 today Pacific time based on 36 observations spanning 5.0802 days (2018-Sep-13.26203 to 2018-Sep-18.34227). Diameter approximately 0.200 km. from weighted mean H=21.10.
NEODyS15002057-207142.32e-08-5.74-6.030NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2018-09-13.263 to 2018-09-17.362."
2018 RB7NEODyS1500209312.4e-07-4.96-4.960NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2018-09-12.469 to 2018-09-17.442."
2018 RP5NEODyS15002105-210921.07e-08-8.80-8.880NEODyS: "Based on 44 optical observations (of which 1 are rejected as outliers) from 2018-09-13.234 to 2018-09-17.368."
2018 RF5JPL Sentry16012103-211538.8371e-06-6.53-6.810JPL: Computed at 08:36 today Pacific time based on 48 observations spanning 6.1670 days (2018-Sep-12.23986 to 2018-Sep-18.40684). Diameter approximately 0.011 km. from weighted mean H=27.37.
NEODyS15002069-211548.81e-06-6.54-6.860NEODyS: "Based on 44 optical observations (of which 0 are rejected as outliers) from 2018-09-12.241 to 2018-09-17.272."
2018 RQ4JPL Sentry16012088-2111114.39712e-06-6.64-7.180JPL: Computed at 08:16 today Pacific time based on 36 observations spanning 7.0603 days (2018-Sep-11.2811 to 2018-Sep-18.3414). Diameter approximately 0.014 km. from weighted mean H=26.85.
2018 RB2JPL Sentry16012092-2118293.277099e-05-5.89-6.300JPL: Computed at 08:59 today Pacific time based on 55 observations spanning 9.1891 days (2018-Sep-07.26955 to 2018-Sep-16.4586). Diameter approximately 0.012 km. from weighted mean H=27.29.
NEODyS15002089-2118895.26e-05-5.71-5.98n/aNEODyS: "Based on 52 optical observations (of which 0 are rejected as outliers) from 2018-09-07.270 to 2018-09-16.459."
2018 RR1JPL Sentry16012083-2118152.413506e-05-7.43-7.540JPL: Computed at 08:47 today Pacific time based on 34 observations spanning 8.0739 days (2018-Sep-07.39342 to 2018-Sep-15.467288). Diameter approximately 0.004 km. from weighted mean H=29.94.
2018 RQ1NEODyS1500211711.32e-07-6.99-6.990NEODyS: "Based on 99 optical observations (of which 1 are rejected as outliers) from 2018-09-07.381 to 2018-09-16.625."

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 18 September '18

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

2010Generated Traffic Report
1700Grabbed MPEC 2018-S35 - 2018 SM - see above
Grabbed MPEC 2018-S36 - 2018 SN - see above
Grabbed MPEC 2018-S37 - 2018 PL28 - see above
Grabbed MPEC 2018-S38 - Comet C/2018 R5 (Lemmon) - see above
1601Noted that JPL Sentry has updated its 2018 RB2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 RF5 risk assessment - see above
Noted that JPL Sentry has updated its 2018 RJ7 risk assessment - see above
Noted that JPL Sentry has updated its 2018 RQ4 risk assessment - see above
Noted that JPL Sentry has updated its 2018 RR1 risk assessment - see above
Grabbed MPEC 2018-S32 - 2018 SL - see above
Grabbed MPEC 2018-S33 - 2018 RR8 - see above
Grabbed MPEC 2018-S34 - 2018 SK - see above
1500Noted that NEODyS has updated its 2018 RB2 risk assessment - see above
Noted that NEODyS has updated its 2018 RB7 risk assessment - see above
Noted that NEODyS has updated its 2018 RF5 risk assessment - see above
Noted that NEODyS has updated its 2018 RJ7 risk assessment - see above
Noted that NEODyS has updated its 2018 RP5 risk assessment - see above
Noted that NEODyS has reposted 2018 RQ1 as an impact risk - see above
Grabbed MPEC 2018-S27 - 2018 SC - see above
Grabbed MPEC 2018-S28 - 2015 ED7 - see above
Grabbed MPEC 2018-S29 - 2016 UA - see above
Grabbed MPEC 2018-S30 - Daily Orbit Update - see above
Grabbed MPEC 2018-S31 - Comet P/2007 V1 = 2018 S1 (Larson) - see above
0333Grabbed MPEC 2018-S25 - 2018 RP8 - see above
Grabbed MPEC 2018-S26 - 2018 SB - see above