RECON: TNO occultation with 98WX31

Event between 98WX31 and star GA1140:02777292 with event index number of 1506851

Geocentric closest approach at 2026/01/10 11:48:33 UTC

J2000 position of star is 07:17:06.8 +25:08:34
Equinox of date position of star is 07:18:27.5 +25:06:07
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 3380 km.
The sky-plane scale is 29055.5 km/arcsec.

The TNO has an absolute magnitude Hv=6.7
Diameter=272.9 km assuming a 5% albedo -- 10.8 sec chord
Diameter=111.4 km assuming a 30% albedo -- 4.4 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 98WX31, (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
98WX31         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=9.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 11:46:28 -30.0 Dark Up 30.8 272.2 Up 11:31:28 - 12:01:28 5749
Kamloops 11:46:38 -39.1 Dark Up 39.9 261.6 Up 11:31:38 - 12:01:38 5216
Kelowna 11:46:35 -38.7 Dark Up 39.4 263.0 Up 11:31:35 - 12:01:35 5183
Peachland 11:46:35 -38.9 Dark Up 39.6 262.9 Up 11:31:35 - 12:01:35 5166
Summerland 11:46:34 -38.9 Dark Up 39.6 263.1 Up 11:31:34 - 12:01:34 5158
Penticton 11:46:33 -38.9 Dark Up 39.5 263.2 Up 11:31:33 - 12:01:33 5156
Oliver 11:46:32 -38.9 Dark Up 39.6 263.5 Up 11:31:32 - 12:01:32 5130
Anarchist Mountain Observatory 11:46:31 -38.9 Dark Up 39.4 263.8 Up 11:31:31 - 12:01:31 5123
Tonasket 11:46:31 -39.0 Dark Up 39.5 264.0 Up 11:31:31 - 12:01:31 5097
Okanogan 11:46:30 -39.1 Dark Up 39.7 264.1 Up 11:31:30 - 12:01:30 5067
Brewster 11:46:30 -39.3 Dark Up 39.8 264.2 Up 11:31:30 - 12:01:30 5040
Manson/Chelan 11:46:29 -39.6 Dark Up 40.1 264.1 Up 11:31:29 - 12:01:29 5012
Wenatchee 11:46:28 -39.8 Dark Up 40.3 264.3 Up 11:31:28 - 12:01:28 4970
Victoria 11:46:36 -41.6 Dark Up 42.1 260.9 Up 11:31:36 - 12:01:36 4960
Dunrhomin 11:45:47 -29.4 Dark Up 29.2 279.5 Low 11:30:47 - 12:00:47 4947
Ellensburg 11:46:27 -40.0 Dark Up 40.5 264.5 Up 11:31:27 - 12:01:27 4931
PNWRO 11:46:21 -39.1 Dark Up 39.4 266.6 Up 11:31:21 - 12:01:21 4907
Yakima 11:46:26 -40.1 Dark Up 40.5 264.8 Up 11:31:26 - 12:01:26 4899
Toppenish/White Swan 11:46:25 -40.0 Dark Up 40.4 265.2 Up 11:31:25 - 12:01:25 4887
Goldendale 11:46:24 -40.4 Dark Up 40.8 265.3 Up 11:31:24 - 12:01:24 4829
The Dalles 11:46:23 -40.7 Dark Up 41.0 265.2 Up 11:31:23 - 12:01:23 4799
Maupin 11:46:23 -40.7 Dark Up 41.0 265.7 Up 11:31:23 - 12:01:23 4769
Sisters 11:46:21 -41.2 Dark Up 41.4 266.0 Up 11:31:21 - 12:01:21 4682
Bend 11:46:19 -41.1 Dark Up 41.2 266.4 Up 11:31:19 - 12:01:19 4671
Oregon Observatory 11:46:19 -41.2 Dark Up 41.3 266.5 Up 11:31:19 - 12:01:19 4652
North Lake 11:46:17 -40.9 Dark Up 41.0 267.4 Up 11:31:17 - 12:01:17 4618
Lakeview 11:46:12 -40.7 Dark Up 40.6 268.7 Up 11:31:12 - 12:01:12 4550
Chiloquin 11:46:16 -41.7 Dark Up 41.7 267.4 Up 11:31:16 - 12:01:16 4529
Klamath Falls 11:46:15 -41.7 Dark Up 41.7 267.7 Up 11:31:15 - 12:01:15 4503
Cedarville 11:46:10 -40.6 Dark Up 40.5 269.4 Up 11:31:10 - 12:01:10 4501
Fall River/Burney 11:46:11 -41.6 Dark Up 41.4 269.0 Up 11:31:11 - 12:01:11 4417
Susanville 11:46:07 -41.1 Dark Up 40.9 270.0 Up 11:31:07 - 12:01:07 4390
Gimple 11:46:07 -41.3 Dark Up 41.1 270.1 Up 11:31:07 - 12:01:07 4359
Greenville 11:46:07 -41.3 Dark Up 41.1 270.1 Up 11:31:07 - 12:01:07 4356
Reno 11:46:04 -40.5 Dark Up 40.3 271.3 Up 11:31:04 - 12:01:04 4346
Portola 11:46:06 -41.0 Dark Up 40.8 270.7 Up 11:31:06 - 12:01:06 4345
Quincy 11:46:07 -41.4 Dark Up 41.1 270.3 Up 11:31:07 - 12:01:07 4339
Yerington 11:46:01 -40.1 Dark Up 39.7 272.2 Up 11:31:01 - 12:01:01 4323
Carson City 11:46:03 -40.5 Dark Up 40.2 271.6 Up 11:31:03 - 12:01:03 4316
Tonopah 11:45:55 -38.6 Dark Up 38.2 274.1 Up 11:30:55 - 12:00:55 4316
Hawthorne 11:45:59 -39.7 Dark Up 39.3 272.9 Up 11:30:59 - 12:00:59 4302
Gardnerville 11:46:02 -40.5 Dark Up 40.2 271.9 Up 11:31:02 - 12:01:02 4297
Indian Springs 11:45:49 -37.4 Dark Up 36.9 276.0 Up 11:30:49 - 12:00:49 4246
Lee Vining 11:45:58 -40.1 Dark Up 39.7 273.0 Up 11:30:58 - 12:00:58 4236
Beatty 11:45:52 -38.2 Dark Up 37.7 275.2 Up 11:30:52 - 12:00:52 4233
Henderson 11:45:47 -36.8 Dark Up 36.3 276.8 Up 11:30:47 - 12:00:47 4227
Patrick 11:45:43 -35.9 Dark Up 35.3 277.8 Up 11:30:43 - 12:00:43 4217
Bishop 11:45:55 -39.5 Dark Up 39.1 273.9 Up 11:30:55 - 12:00:55 4211
Kingman/Dolan Springs 11:45:43 -36.0 Dark Up 35.4 277.8 Up 11:30:43 - 12:00:43 4190
Laughlin/Bullhead City 11:45:44 -36.5 Dark Up 35.8 277.6 Up 11:30:44 - 12:00:44 4168
George/Scottsdale 11:45:36 -34.2 Dark Up 33.4 279.9 Up 11:30:36 - 12:00:36 4151
Mohave Valley 11:45:43 -36.5 Dark Up 35.8 277.8 Up 11:30:43 - 12:00:43 4144
Lake Havasu City 11:45:41 -36.2 Dark Up 35.5 278.2 Up 11:30:41 - 12:00:41 4119
Parker 11:45:40 -36.2 Dark Up 35.5 278.5 Up 11:30:40 - 12:00:40 4089
Idyllwild 11:45:43 -38.2 Dark Up 37.4 277.6 Up 11:30:43 - 12:00:43 3958
Calipatria 11:45:40 -37.2 Dark Up 36.3 278.6 Up 11:30:40 - 12:00:40 3950
Yuma 11:45:37 -36.4 Dark Up 35.5 279.3 Up 11:30:37 - 12:00:37 3948
Wildwood 11:45:47 -39.7 Dark Up 39.0 276.4 Up 11:30:47 - 12:00:47 3915

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 98WX31, (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
98WX31         07:17:06.8 +25:08:34 15.0        91
Positions are for J2000

Event circumstances last updated at 2022/01/07 23:46:37 UT

Marc W. Buie, Southwest Research Institute

RECON