RECON: TNO occultation with 250112

Event between (250112) 02KY14 and star GA0840:03791580 with event index number of 2180477

Geocentric closest approach at 2026/10/26 12:27:11 UTC

J2000 position of star is 09:27:16.2 -04:36:13
Equinox of date position of star is 09:28:29.0 -04:42:35
Stellar brightness G=16.2, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 109 degrees from the moon. Moon is 100% illuminated.
Apparent brightness V=22.1

[RECON map]
Object is 16.0 AU from the Sun and 16.3 AU from the Earth.
Apparent velocity is 19.8 km/sec on the sky relative to the star, or, 6.0 arcsec/hr.
The 1-sigma error in the time of the event is 62 seconds.
The 1-sigma cross-track error in the shadow position is 1364 km.
The sky-plane scale is 11834.6 km/arcsec.

The object has an absolute magnitude Hv=9.7
Diameter=72.4 km assuming a 5% albedo -- 3.4 sec chord
Diameter=29.6 km assuming a 30% albedo -- 1.4 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 250112, (2026/10/26 12:26UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:47.9 +11:50:06  1.3 19.47 112
Alphard        09:28:54.3 -08:46:34  2.0  4.06 110
PPM 192436     09:30:53.2 -04:21:56  6.3  0.67 109
PPM 192371     09:27:44.1 -04:50:10  8.4  0.25 108
PPM 192389     09:28:45.0 -04:40:46  8.8  0.05 109
250112         09:28:36.9 -04:43:16 16.2       109
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 5.0 sigma about the mid-time.
The median site spacing is 15.4 km RECON observability=0.9 and success probability=8.8%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 12:22:53 -13.7 AT Up 28.8 148.8 Low 12:17:11 - 12:28:34 4264
Kamloops 12:22:27 -22.8 Dark Up 24.2 133.4 Low 12:16:45 - 12:28:08 3512
Kelowna 12:22:29 -22.3 Dark Up 25.2 134.0 Low 12:16:47 - 12:28:10 3479
Peachland 12:22:28 -22.5 Dark Up 25.1 133.7 Low 12:16:47 - 12:28:10 3457
Summerland 12:22:28 -22.5 Dark Up 25.3 133.7 Low 12:16:46 - 12:28:09 3449
Penticton 12:22:29 -22.4 Dark Up 25.4 133.8 Low 12:16:47 - 12:28:10 3447
Dunrhomin 12:23:10 -12.1 AT Up 39.1 145.3 Up 12:17:29 - 12:28:52 3423
Oliver 12:22:29 -22.5 Dark Up 25.6 133.7 Low 12:16:47 - 12:28:10 3417
Anarchist Mountain Observatory 12:22:29 -22.3 Dark Up 25.8 133.8 Low 12:16:48 - 12:28:11 3411
Nikitin 12:23:10 -12.1 AT Up 39.2 145.2 Up 12:17:28 - 12:28:51 3407
CU-SBO 12:23:11 -12.2 AT Up 39.2 145.1 Up 12:17:29 - 12:28:52 3397
Okanogan 12:22:29 -22.6 Dark Up 26.1 133.4 Low 12:16:48 - 12:28:11 3345
Brewster 12:22:28 -22.7 Dark Up 26.2 133.1 Low 12:16:47 - 12:28:10 3313
Manson/Chelan 12:22:29 -23.0 Dark Up 26.2 132.6 Low 12:16:47 - 12:28:10 3278
Wenatchee 12:22:29 -23.2 Dark Up 26.4 132.3 Low 12:16:47 - 12:28:10 3229
Victoria 12:22:22 -25.1 Dark Up 24.1 129.7 Low 12:16:40 - 12:28:03 3196
Ellensburg 12:22:29 -23.4 Dark Up 26.6 131.9 Low 12:16:47 - 12:28:10 3183
PNWRO 12:22:33 -22.3 Dark Up 28.1 133.2 Low 12:16:51 - 12:28:14 3172
Yakima 12:22:29 -23.4 Dark Up 26.9 131.8 Low 12:16:48 - 12:28:11 3147
Toppenish/White Swan 12:22:29 -23.3 Dark Up 27.1 131.9 Low 12:16:48 - 12:28:11 3135
The Dalles 12:22:29 -24.0 Dark Up 27.2 130.8 Low 12:16:47 - 12:28:10 3031
Maupin 12:22:28 -23.9 Dark Up 27.5 130.7 Low 12:16:47 - 12:28:10 2998
Sisters 12:22:29 -24.4 Dark Up 27.8 129.9 Low 12:16:48 - 12:28:11 2897
Bend 12:22:30 -24.2 Dark Up 28.1 130.1 Low 12:16:49 - 12:28:12 2888
Oregon Observatory 12:22:30 -24.3 Dark Up 28.2 129.9 Low 12:16:48 - 12:28:11 2866
Chiloquin 12:22:31 -24.8 Dark Up 28.8 128.9 Low 12:16:49 - 12:28:12 2729
Cedarville 12:22:34 -23.6 Dark Up 30.4 130.1 Up 12:16:52 - 12:28:15 2717
Klamath Falls 12:22:31 -24.7 Dark Up 29.0 128.9 Low 12:16:50 - 12:28:13 2702
Fall River/Burney 12:22:32 -24.6 Dark Up 30.0 128.7 Low 12:16:51 - 12:28:14 2614
Gimple 12:22:35 -24.2 Dark Up 30.9 128.8 Up 12:16:54 - 12:28:17 2558
Reno 12:22:38 -23.4 Dark Up 31.9 129.5 Up 12:16:57 - 12:28:20 2558
Greenville 12:22:35 -24.3 Dark Up 30.8 128.7 Up 12:16:54 - 12:28:17 2554
Portola 12:22:37 -23.9 Dark Up 31.3 129.0 Up 12:16:55 - 12:28:18 2549
Yerington 12:22:41 -22.9 Dark Up 32.6 129.9 Up 12:16:59 - 12:28:22 2542
Quincy 12:22:35 -24.3 Dark Up 31.0 128.6 Up 12:16:54 - 12:28:17 2536
Hawthorne 12:22:42 -22.5 Dark Up 33.3 130.2 Up 12:17:01 - 12:28:24 2529
Carson City 12:22:39 -23.4 Dark Up 32.1 129.4 Up 12:16:57 - 12:28:20 2527
Patrick 12:22:58 -18.7 Dark Up 38.2 133.2 Up 12:17:17 - 12:28:40 2521
Gardnerville 12:22:39 -23.4 Dark Up 32.3 129.3 Up 12:16:57 - 12:28:20 2508
George/Scottsdale 12:23:07 -16.9 AT Up 40.6 134.4 Up 12:17:25 - 12:28:48 2497
Beatty 12:22:49 -21.1 Dark Up 35.5 131.1 Up 12:17:07 - 12:28:30 2487
Laughlin/Bullhead City 12:22:57 -19.2 Dark Up 38.0 132.4 Up 12:17:16 - 12:28:39 2459
Lee Vining 12:22:42 -22.9 Dark Up 33.3 129.4 Up 12:17:01 - 12:28:24 2453
Bishop 12:22:45 -22.4 Dark Up 34.2 129.8 Up 12:17:03 - 12:28:26 2439
Lake Havasu City 12:23:00 -19.0 Dark Up 38.6 132.3 Up 12:17:18 - 12:28:41 2416
Yuma 12:23:02 -19.1 Dark Up 39.6 130.9 Up 12:17:21 - 12:28:44 2244
Calipatria 12:22:58 -19.9 Dark Up 38.7 130.2 Up 12:17:17 - 12:28:40 2228
Idyllwild 12:22:55 -21.0 Dark Up 37.6 129.4 Up 12:17:14 - 12:28:37 2213
Wildwood 12:22:50 -22.5 Dark Up 36.1 127.8 Up 12:17:09 - 12:28:32 2138

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 250112, (2026/10/26 12:26UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3 19.47 112
Alphard        09:27:35.2 -08:39:30  2.0  4.06 110
PPM 192436     09:29:32.4 -04:14:49  6.3  0.67 109
PPM 192371     09:26:23.5 -04:43:08  8.4  0.25 108
PPM 192389     09:27:24.3 -04:33:43  8.8  0.05 109
250112         09:27:16.2 -04:36:13 16.2       109
Positions are for J2000

Event circumstances last updated at 2024/03/05 04:51:41 UT

Marc W. Buie, Southwest Research Institute

RECON