RECON: TNO occultation with 535231

Event between (535231) 14YJ50 and star GA1080:03249115 with event index number of 2259210

Geocentric closest approach at 2026/01/26 09:59:53 UTC

J2000 position of star is 09:46:45.0 +19:30:58
Equinox of date position of star is 09:47:59.3 +19:24:44
Stellar brightness G=15.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 103 degrees from the moon. Moon is 53% illuminated.
TNO apparent brightness V=22.5

[RECON map]
TNO is 36.8 AU from the Sun and 35.9 AU from the Earth.
The TNO is moving 24.0 km/sec on the sky relative to the star, or, 3.3 arcsec/hr.
The 1-sigma error in the time of the event is 210 seconds.
The 1-sigma cross-track error in the shadow position is 3028 km.
The sky-plane scale is 26031.3 km/arcsec.

The TNO has an absolute magnitude Hv=6.8
Diameter=258.2 km assuming a 5% albedo -- 10.8 sec chord
Diameter=105.4 km assuming a 30% albedo -- 4.4 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 535231, (2026/01/26 09:54UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:45.5 +11:50:20  1.3  9.16 111
20 Leo         09:51:17.4 +21:03:24  6.1  1.81 102
PPM 126811     09:49:53.5 +18:41:03  8.4  0.82 103
PPM 126777     09:48:00.4 +19:35:21 10.0  0.20 102
PPM 126788     09:48:47.5 +19:17:12 11.1  0.18 103
535231         09:48:11.9 +19:23:40 15.6       103
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 4.3 sigma about the mid-time.
The median site spacing is 21.7 km RECON observability=1.0 and success probability=12.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 09:59:44 -43.8 Dark Down 52.8 217.6 Up 09:44:44 - 10:14:44 4798
Kamloops 10:00:17 -51.7 Dark Down 58.1 195.7 Up 09:45:17 - 10:15:17 4265
Kelowna 10:00:14 -51.9 Dark Down 58.7 197.6 Up 09:45:14 - 10:15:14 4221
Peachland 10:00:14 -52.1 Dark Down 58.9 197.2 Up 09:45:14 - 10:15:14 4204
Summerland 10:00:14 -52.1 Dark Down 59.0 197.4 Up 09:45:14 - 10:15:14 4194
Penticton 10:00:13 -52.1 Dark Down 59.0 197.6 Up 09:45:13 - 10:15:13 4191
Oliver 10:00:12 -52.4 Dark Down 59.4 197.8 Up 09:45:12 - 10:15:12 4161
Anarchist Mountain Observatory 10:00:12 -52.4 Dark Down 59.5 198.3 Up 09:45:12 - 10:15:12 4152
Tonasket 10:00:11 -52.7 Dark Down 59.8 198.3 Up 09:45:11 - 10:15:11 4124
Okanogan 10:00:11 -53.0 Dark Down 60.1 198.2 Up 09:45:11 - 10:15:11 4090
Brewster 10:00:11 -53.3 Dark Down 60.4 198.0 Up 09:45:11 - 10:15:11 4061
Manson/Chelan 10:00:12 -53.6 Dark Down 60.7 197.4 Up 09:45:12 - 10:15:12 4032
Victoria 10:00:21 -54.6 Dark Down 60.6 191.0 Up 09:45:21 - 10:15:21 3994
Wenatchee 10:00:11 -54.0 Dark Down 61.2 197.3 Up 09:45:11 - 10:15:11 3985
Ellensburg 10:00:11 -54.4 Dark Down 61.7 197.1 Up 09:45:11 - 10:15:11 3943
Yakima 10:00:11 -54.7 Dark Down 62.0 197.3 Up 09:45:11 - 10:15:11 3906
PNWRO 10:00:04 -54.2 Dark Down 62.2 200.9 Up 09:45:04 - 10:15:04 3905
Toppenish/White Swan 10:00:09 -54.7 Dark Down 62.2 197.7 Up 09:45:09 - 10:15:09 3892
Dunrhomin 09:59:12 -48.4 Dark Down 61.0 231.3 Up 09:44:12 - 10:14:12 3877
CU-SBO 09:59:11 -48.6 Dark Down 61.2 231.5 Up 09:44:11 - 10:14:11 3852
Goldendale 10:00:10 -55.3 Dark Down 62.8 197.2 Up 09:45:10 - 10:15:10 3830
The Dalles 10:00:10 -55.7 Dark Down 63.1 196.6 Up 09:45:10 - 10:15:10 3799
Maupin 10:00:09 -55.9 Dark Down 63.5 197.1 Up 09:45:09 - 10:15:09 3765
Sisters 10:00:09 -56.8 Dark Down 64.4 196.5 Up 09:45:09 - 10:15:09 3670
Bend 10:00:08 -56.8 Dark Down 64.6 197.2 Up 09:45:08 - 10:15:08 3657
Oregon Observatory 10:00:08 -57.0 Dark Down 64.8 197.1 Up 09:45:08 - 10:15:08 3637
North Lake 10:00:05 -57.1 Dark Down 65.3 198.6 Up 09:45:05 - 10:15:05 3595
Lakeview 10:00:01 -57.5 Dark Down 66.2 200.6 Up 09:45:01 - 10:15:01 3516
Chiloquin 10:00:07 -58.1 Dark Down 66.2 197.0 Up 09:45:07 - 10:15:07 3503
Klamath Falls 10:00:05 -58.2 Dark Down 66.5 197.4 Up 09:45:05 - 10:15:05 3474
Cedarville 09:59:59 -57.8 Dark Down 66.7 201.5 Up 09:44:59 - 10:14:59 3461
Fall River/Burney 10:00:02 -58.8 Dark Down 67.5 199.1 Up 09:45:02 - 10:15:02 3376
Susanville 09:59:59 -58.7 Dark Down 67.9 201.4 Up 09:44:59 - 10:14:59 3342
Gimple 09:59:59 -59.0 Dark Down 68.2 201.1 Up 09:44:59 - 10:14:59 3309
Greenville 09:59:59 -59.1 Dark Down 68.2 200.9 Up 09:44:59 - 10:14:59 3306
Portola 09:59:57 -59.0 Dark Down 68.4 202.4 Up 09:44:57 - 10:14:57 3291
Reno 09:59:54 -58.7 Dark Down 68.5 204.2 Up 09:44:54 - 10:14:54 3288
Quincy 09:59:58 -59.2 Dark Down 68.4 201.1 Up 09:44:58 - 10:14:58 3287
Yerington 09:59:51 -58.6 Dark Down 68.8 206.4 Up 09:44:51 - 10:14:51 3258
Carson City 09:59:54 -58.9 Dark Down 68.8 204.6 Up 09:44:54 - 10:14:54 3255
Tonopah 09:59:44 -57.8 Dark Down 68.8 212.1 Up 09:44:44 - 10:14:44 3239
Gardnerville 09:59:53 -59.0 Dark Down 69.0 205.0 Up 09:44:53 - 10:14:53 3234
Hawthorne 09:59:49 -58.5 Dark Down 69.0 208.2 Up 09:44:49 - 10:14:49 3233
Lee Vining 09:59:49 -59.1 Dark Down 69.7 207.7 Up 09:44:49 - 10:14:49 3163
Indian Springs 09:59:35 -57.4 Dark Down 69.4 217.8 Up 09:44:35 - 10:14:35 3155
Beatty 09:59:39 -58.0 Dark Down 69.6 214.8 Up 09:44:39 - 10:14:39 3146
Bishop 09:59:46 -58.9 Dark Down 69.9 210.2 Up 09:44:46 - 10:14:46 3132
Henderson 09:59:32 -57.1 Dark Down 69.4 220.2 Up 09:44:32 - 10:14:32 3130
Patrick 09:59:27 -56.5 Dark Down 69.3 223.7 Up 09:44:27 - 10:14:27 3113
Kingman/Dolan Springs 09:59:27 -56.7 Dark Down 69.6 223.8 Up 09:44:27 - 10:14:27 3085
Laughlin/Bullhead City 09:59:29 -57.1 Dark Down 69.9 222.7 Up 09:44:29 - 10:14:29 3063
Mohave Valley 09:59:28 -57.2 Dark Down 70.1 223.2 Up 09:44:28 - 10:14:28 3038
George/Scottsdale 09:59:16 -55.5 Dark Down 69.3 231.1 Up 09:44:16 - 10:14:16 3031
Lake Havasu City 09:59:26 -57.2 Dark Down 70.2 224.5 Up 09:44:26 - 10:14:26 3009
Parker 09:59:25 -57.3 Dark Down 70.5 225.2 Up 09:44:25 - 10:14:25 2977
Idyllwild 09:59:33 -59.3 Dark Down 72.1 220.4 Up 09:44:33 - 10:14:33 2847
Calipatria 09:59:28 -58.6 Dark Down 71.9 224.5 Up 09:44:28 - 10:14:28 2833
Yuma 09:59:23 -58.0 Dark Down 71.7 227.5 Up 09:44:23 - 10:14:23 2826
Wildwood 09:59:40 -60.6 Dark Down 72.8 214.8 Up 09:44:40 - 10:14:40 2812

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 535231, (2026/01/26 09:54UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3  9.16 111
20 Leo         09:49:50.0 +21:10:46  6.1  1.81 102
PPM 126811     09:48:26.9 +18:48:23  8.4  0.82 103
PPM 126777     09:46:33.4 +19:42:39 10.0  0.20 102
PPM 126788     09:47:20.7 +19:24:30 11.1  0.18 103
535231         09:46:45.0 +19:30:58 15.6       103
Positions are for J2000

Event circumstances last updated at 2022/04/13 23:08:55 UT

Marc W. Buie, Southwest Research Institute

RECON