RECON: TNO occultation with 523718

Event between (523718) 14KZ101 and star GA0840:08619061 with event index number of 2330196

Geocentric closest approach at 2026/06/23 06:01:00 UTC

J2000 position of star is 18:26:07.1 -05:51:37
Equinox of date position of star is 18:27:25.7 -05:50:39
Stellar brightness G=16.1, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 81 degrees from the moon. Moon is 63% illuminated.
Apparent brightness V=22.1

[RECON map]
Object is 36.0 AU from the Sun and 35.0 AU from the Earth.
Apparent velocity is 22.9 km/sec on the sky relative to the star, or, 3.2 arcsec/hr.
The 1-sigma error in the time of the event is 383 seconds.
The 1-sigma cross-track error in the shadow position is 1690 km.
The sky-plane scale is 25407.9 km/arcsec.

The object has an absolute magnitude Hv=6.5
Diameter=316.2 km assuming a 5% albedo -- 13.2 sec chord
Diameter=129.1 km assuming a 30% albedo -- 5.4 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 

Star training set for 523718, (2026/06/23 06:01UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:02.1 -26:29:18  0.9 34.59  52
60Bet Oph      17:44:46.9 +04:33:29  2.8 14.90  72
PPM 201808     18:31:39.2 -05:42:16  6.2  1.03  82
PPM 201758     18:28:02.0 -05:35:04  8.5  0.29  81
PPM 201741     18:26:54.9 -05:37:37  8.7  0.27  81
523718         18:27:32.1 -05:50:35 16.1        81
Positions are for equinox of date

This table contains the target star visibility for the RECON network. The observing range has been set to a maximum of 2.4 sigma about the mid-time.
The median site spacing is 27.9 km RECON observability=0.7 and success probability=23.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 06:01:49 -13.2 AT Up 29.5 156.3 Low 05:46:49 - 06:16:49 114
Kamloops 06:02:30 -11.2 NT Up 26.0 140.8 Low 05:47:30 - 06:17:30 28
Kelowna 06:02:29 -12.2 AT Up 27.0 141.4 Low 05:47:29 - 06:17:29 -21
Peachland 06:02:30 -12.2 AT Up 27.0 141.1 Low 05:47:30 - 06:17:30 -28
Summerland 06:02:31 -12.4 AT Up 27.1 141.1 Low 05:47:31 - 06:17:31 -37
Penticton 06:02:30 -12.5 AT Up 27.2 141.2 Low 05:47:30 - 06:17:30 -41
Oliver 06:02:31 -12.8 AT Up 27.5 141.1 Low 05:47:31 - 06:17:31 -63
Anarchist Mountain Observatory 06:02:31 -13.0 AT Up 27.7 141.3 Low 05:47:31 - 06:17:31 -73
Victoria 06:02:43 -12.1 AT Up 26.3 137.1 Low 05:47:43 - 06:17:43 -110
Okanogan 06:02:33 -13.5 AT Up 28.1 140.8 Low 05:47:33 - 06:17:33 -115
Brewster 06:02:34 -13.7 AT Up 28.2 140.5 Low 05:47:34 - 06:17:34 -132
Manson/Chelan 06:02:36 -13.7 AT Up 28.2 140.1 Low 05:47:36 - 06:17:36 -146
Wenatchee 06:02:37 -14.1 AT Up 28.5 139.8 Low 05:47:37 - 06:17:37 -178
Ellensburg 06:02:38 -14.4 AT Up 28.8 139.4 Low 05:47:38 - 06:17:38 -205
Yakima 06:02:39 -14.8 AT Up 29.1 139.2 Low 05:47:39 - 06:17:39 -232
Toppenish/White Swan 06:02:40 -15.0 AT Up 29.3 139.3 Low 05:47:40 - 06:17:40 -246
PNWRO 06:02:36 -15.8 AT Up 30.2 140.7 Up 05:47:36 - 06:17:36 -269
The Dalles 06:02:43 -15.4 AT Up 29.5 138.3 Low 05:47:43 - 06:17:43 -300
Maupin 06:02:44 -15.8 AT Up 29.9 138.2 Low 05:47:44 - 06:17:44 -328
Sisters 06:02:47 -16.4 AT Up 30.3 137.4 Up 05:47:47 - 06:17:47 -390
Bend 06:02:47 -16.7 AT Up 30.6 137.6 Up 05:47:47 - 06:17:47 -406
Oregon Observatory 06:02:48 -16.8 AT Up 30.7 137.4 Up 05:47:48 - 06:17:48 -419
Chiloquin 06:02:52 -17.8 AT Up 31.4 136.4 Up 05:47:52 - 06:17:52 -514
Klamath Falls 06:02:52 -18.1 Dark Up 31.7 136.3 Up 05:47:52 - 06:17:52 -539
Cedarville 06:02:49 -19.3 Dark Up 33.1 137.7 Up 05:47:49 - 06:17:49 -588
Fall River/Burney 06:02:53 -19.3 Dark Up 32.8 136.2 Up 05:47:53 - 06:17:53 -626
Dunrhomin 06:02:03 -24.8 Dark Up 40.4 153.8 Up 05:47:03 - 06:17:03 -682
Greenville 06:02:54 -20.3 Dark Up 33.7 136.3 Up 05:47:54 - 06:17:54 -694
Gimple 06:02:54 -20.3 Dark Up 33.7 136.3 Up 05:47:54 - 06:17:54 -694
Nikitin 06:02:03 -24.9 Dark Up 40.6 153.7 Up 05:47:03 - 06:17:03 -696
CU-SBO 06:02:03 -25.0 Dark Up 40.6 153.6 Up 05:47:03 - 06:17:03 -701
Quincy 06:02:54 -20.4 Dark Up 33.8 136.2 Up 05:47:54 - 06:17:54 -709
Portola 06:02:53 -20.7 Dark Up 34.2 136.6 Up 05:47:53 - 06:17:53 -718
Reno 06:02:52 -21.2 Dark Up 34.7 137.1 Up 05:47:52 - 06:17:52 -737
Carson City 06:02:52 -21.5 Dark Up 35.0 137.0 Up 05:47:52 - 06:17:52 -765
Yerington 06:02:51 -21.9 Dark Up 35.5 137.5 Up 05:47:51 - 06:17:51 -780
Gardnerville 06:02:53 -21.8 Dark Up 35.2 136.9 Up 05:47:53 - 06:17:53 -784
Hawthorne 06:02:50 -22.5 Dark Up 36.1 137.9 Up 05:47:50 - 06:17:50 -815
Lee Vining 06:02:53 -22.9 Dark Up 36.2 137.1 Up 05:47:53 - 06:17:53 -860
Bishop 06:02:51 -23.7 Dark Up 37.1 137.5 Up 05:47:51 - 06:17:51 -907
Beatty 06:02:47 -24.7 Dark Up 38.3 139.0 Up 05:47:47 - 06:17:47 -943
Patrick 06:02:39 -27.0 Dark Up 40.9 141.4 Up 05:47:39 - 06:17:39 -1063
Laughlin/Bullhead City 06:02:42 -27.0 Dark Up 40.7 140.5 Up 05:47:42 - 06:17:42 -1084
Lake Havasu City 06:02:42 -27.7 Dark Up 41.4 140.4 Up 05:47:42 - 06:17:42 -1140
Wildwood 06:02:58 -26.5 Dark Up 39.3 135.6 Up 05:47:58 - 06:17:58 -1176
Idyllwild 06:02:52 -27.5 Dark Up 40.7 137.4 Up 05:47:52 - 06:17:52 -1204
George/Scottsdale 06:02:35 -29.2 Dark Up 43.2 142.8 Up 05:47:35 - 06:17:35 -1205
Calipatria 06:02:49 -28.5 Dark Up 41.8 138.3 Up 05:47:49 - 06:17:49 -1256
Yuma 06:02:46 -29.2 Dark Up 42.6 139.0 Up 05:47:46 - 06:17:46 -1293

Azimuth is measured in degrees eastward from north. North is at an azimuth of 0, due East is at an azimuth of 90 degrees, due South is 180, and due West is 270.

Do not use the listing below for the RECON CPC 1100 telescopes. This is provided for other non-team facilities.

Star training set for 523718, (2026/06/23 06:01UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 34.59  52
60Bet Oph      17:43:28.3 +04:34:06  2.8 14.90  72
PPM 201808     18:30:14.3 -05:43:28  6.2  1.03  82
PPM 201758     18:26:37.2 -05:36:07  8.5  0.29  81
PPM 201741     18:25:30.0 -05:38:37  8.7  0.27  81
523718         18:26:07.1 -05:51:37 16.1        81
Positions are for J2000

Event circumstances last updated at 2024/06/19 21:29:37 UT

Marc W. Buie, Southwest Research Institute

RECON