RECON: TNO occultation with 612083

Event between (612083) 98WX31 and star GA1140:02914588 with event index number of 2805200

Geocentric closest approach at 2026/01/10 11:48:32 UTC

J2000 position of star is 07:17:06.8 +25:08:34
Equinox of date position of star is 07:18:28.7 +25:06:05
Stellar brightness G=15.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 91 degrees from the moon. Moon is 52% illuminated.
TNO apparent brightness V=22.8

[RECON map]
TNO is 41.0 AU from the Sun and 40.1 AU from the Earth.
The TNO is moving 25.4 km/sec on the sky relative to the star, or, 3.1 arcsec/hr.
The 1-sigma error in the time of the event is 795 seconds.
The 1-sigma cross-track error in the shadow position is 3372 km.
The sky-plane scale is 29055.5 km/arcsec.

The TNO has an absolute magnitude Hv=6.7
Diameter=270.4 km assuming a 5% albedo -- 10.7 sec chord
Diameter=110.4 km assuming a 30% albedo -- 4.4 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 612083, (2026/01/10 11:49UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:54.5 +27:57:40  1.1  6.93  86
57 Gem         07:25:03.6 +24:59:54  5.9  1.44  90
52 Gem         07:16:17.4 +24:50:15  7.0  0.60  92
PPM 097348     07:20:19.4 +25:32:44  8.7  0.58  91
PPM 097285     07:18:05.9 +24:50:36 10.9  0.29  91
612083         07:18:42.2 +25:05:40 15.0        91
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 1.1 sigma about the mid-time.
The median site spacing is 17.3 km RECON observability=1.0 and success probability=9.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 11:46:28 -30.0 Dark Up 30.8 272.2 Up 11:31:28 - 12:01:28 5779
Kamloops 11:46:39 -39.1 Dark Up 39.9 261.6 Up 11:31:39 - 12:01:39 5247
Kelowna 11:46:34 -38.7 Dark Up 39.4 263.0 Up 11:31:34 - 12:01:34 5214
Peachland 11:46:34 -39.0 Dark Up 39.6 262.9 Up 11:31:34 - 12:01:34 5196
Summerland 11:46:34 -38.9 Dark Up 39.6 263.1 Up 11:31:34 - 12:01:34 5188
Penticton 11:46:33 -38.9 Dark Up 39.5 263.2 Up 11:31:33 - 12:01:33 5186
Oliver 11:46:32 -38.9 Dark Up 39.6 263.5 Up 11:31:32 - 12:01:32 5160
Anarchist Mountain Observatory 11:46:32 -38.9 Dark Up 39.4 263.8 Up 11:31:32 - 12:01:32 5154
Tonasket 11:46:30 -39.0 Dark Up 39.5 264.0 Up 11:31:30 - 12:01:30 5128
Okanogan 11:46:30 -39.1 Dark Up 39.7 264.1 Up 11:31:30 - 12:01:30 5097
Brewster 11:46:29 -39.3 Dark Up 39.8 264.2 Up 11:31:29 - 12:01:29 5070
Manson/Chelan 11:46:28 -39.6 Dark Up 40.1 264.1 Up 11:31:28 - 12:01:28 5043
Wenatchee 11:46:28 -39.8 Dark Up 40.3 264.3 Up 11:31:28 - 12:01:28 5001
Victoria 11:46:36 -41.6 Dark Up 42.1 260.9 Up 11:31:36 - 12:01:36 4990
Dunrhomin 11:45:47 -29.4 Dark Up 29.2 279.5 Low 11:30:47 - 12:00:47 4978
Ellensburg 11:46:27 -40.0 Dark Up 40.4 264.5 Up 11:31:27 - 12:01:27 4961
CU-SBO 11:45:46 -29.4 Dark Up 29.2 279.6 Low 11:30:46 - 12:00:46 4955
PNWRO 11:46:21 -39.1 Dark Up 39.4 266.6 Up 11:31:21 - 12:01:21 4938
Yakima 11:46:25 -40.1 Dark Up 40.5 264.8 Up 11:31:25 - 12:01:25 4929
Toppenish/White Swan 11:46:25 -40.0 Dark Up 40.4 265.2 Up 11:31:25 - 12:01:25 4917
Goldendale 11:46:23 -40.4 Dark Up 40.8 265.3 Up 11:31:23 - 12:01:23 4860
The Dalles 11:46:23 -40.7 Dark Up 41.0 265.2 Up 11:31:23 - 12:01:23 4829
Maupin 11:46:22 -40.7 Dark Up 41.0 265.6 Up 11:31:22 - 12:01:22 4799
Sisters 11:46:20 -41.2 Dark Up 41.4 266.0 Up 11:31:20 - 12:01:20 4712
Bend 11:46:19 -41.1 Dark Up 41.2 266.4 Up 11:31:19 - 12:01:19 4701
Oregon Observatory 11:46:19 -41.2 Dark Up 41.3 266.5 Up 11:31:19 - 12:01:19 4683
North Lake 11:46:16 -40.9 Dark Up 41.0 267.4 Up 11:31:16 - 12:01:16 4649
Lakeview 11:46:12 -40.7 Dark Up 40.6 268.7 Up 11:31:12 - 12:01:12 4580
Chiloquin 11:46:16 -41.7 Dark Up 41.7 267.4 Up 11:31:16 - 12:01:16 4559
Klamath Falls 11:46:15 -41.7 Dark Up 41.7 267.7 Up 11:31:15 - 12:01:15 4534
Cedarville 11:46:10 -40.6 Dark Up 40.5 269.4 Up 11:31:10 - 12:01:10 4531
Fall River/Burney 11:46:10 -41.6 Dark Up 41.4 269.0 Up 11:31:10 - 12:01:10 4447
Susanville 11:46:07 -41.1 Dark Up 40.9 270.0 Up 11:31:07 - 12:01:07 4420
Gimple 11:46:07 -41.3 Dark Up 41.1 270.1 Up 11:31:07 - 12:01:07 4389
Greenville 11:46:07 -41.3 Dark Up 41.1 270.1 Up 11:31:07 - 12:01:07 4386
Reno 11:46:03 -40.5 Dark Up 40.3 271.3 Up 11:31:03 - 12:01:03 4376
Portola 11:46:05 -41.0 Dark Up 40.8 270.7 Up 11:31:05 - 12:01:05 4375
Quincy 11:46:06 -41.4 Dark Up 41.1 270.3 Up 11:31:06 - 12:01:06 4369
Yerington 11:46:01 -40.1 Dark Up 39.7 272.2 Up 11:31:01 - 12:01:01 4353
Carson City 11:46:02 -40.5 Dark Up 40.2 271.6 Up 11:31:02 - 12:01:02 4346
Tonopah 11:45:55 -38.6 Dark Up 38.2 274.1 Up 11:30:55 - 12:00:55 4346
Hawthorne 11:45:59 -39.7 Dark Up 39.3 272.9 Up 11:30:59 - 12:00:59 4333
Gardnerville 11:46:02 -40.5 Dark Up 40.2 271.9 Up 11:31:02 - 12:01:02 4327
Indian Springs 11:45:49 -37.4 Dark Up 36.9 276.0 Up 11:30:49 - 12:00:49 4277
Lee Vining 11:45:58 -40.1 Dark Up 39.7 273.0 Up 11:30:58 - 12:00:58 4266
Beatty 11:45:51 -38.3 Dark Up 37.7 275.2 Up 11:30:51 - 12:00:51 4263
Henderson 11:45:46 -36.8 Dark Up 36.3 276.8 Up 11:30:46 - 12:00:46 4257
Patrick 11:45:43 -35.9 Dark Up 35.3 277.8 Up 11:30:43 - 12:00:43 4247
Bishop 11:45:55 -39.5 Dark Up 39.1 273.9 Up 11:30:55 - 12:00:55 4241
Kingman/Dolan Springs 11:45:43 -36.0 Dark Up 35.4 277.8 Up 11:30:43 - 12:00:43 4221
Laughlin/Bullhead City 11:45:43 -36.5 Dark Up 35.8 277.6 Up 11:30:43 - 12:00:43 4198
George/Scottsdale 11:45:36 -34.2 Dark Up 33.4 279.9 Up 11:30:36 - 12:00:36 4181
Mohave Valley 11:45:43 -36.5 Dark Up 35.8 277.8 Up 11:30:43 - 12:00:43 4174
Lake Havasu City 11:45:41 -36.2 Dark Up 35.5 278.2 Up 11:30:41 - 12:00:41 4149
Parker 11:45:40 -36.2 Dark Up 35.5 278.5 Up 11:30:40 - 12:00:40 4120
Idyllwild 11:45:43 -38.2 Dark Up 37.4 277.6 Up 11:30:43 - 12:00:43 3988
Calipatria 11:45:39 -37.2 Dark Up 36.3 278.6 Up 11:30:39 - 12:00:39 3981
Yuma 11:45:37 -36.4 Dark Up 35.5 279.3 Up 11:30:37 - 12:00:37 3978
Wildwood 11:45:47 -39.7 Dark Up 39.0 276.4 Up 11:30:47 - 12:00:47 3945

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 612083, (2026/01/10 11:49UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1  6.93  86
57 Gem         07:23:28.4 +25:03:01  5.9  1.44  90
52 Gem         07:14:42.1 +24:53:04  7.0  0.60  92
PPM 097348     07:18:43.7 +25:35:41  8.7  0.58  91
PPM 097285     07:16:30.6 +24:53:29 10.9  0.29  91
612083         07:17:06.8 +25:08:34 15.0        91
Positions are for J2000

Event circumstances last updated at 2022/05/04 23:17:52 UT

Marc W. Buie, Southwest Research Institute

RECON