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 07:18:18.0 +25:06:25
Stellar brightness G=15.0, use SENSEUP=128
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 3378 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         07:46:54.6 +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 12.8 km RECON observability=1.0 and success probability=6.8%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 11:46:34 -38.7 Dark Up 39.3 263.1 Up 11:31:34 - 12:01:34 5188
Summerland 11:46:34 -38.9 Dark Up 39.6 263.1 Up 11:31:34 - 12:01:34 5157
Penticton 11:46:33 -38.9 Dark Up 39.5 263.2 Up 11:31:33 - 12:01:33 5156
Okanagan Falls 11:46:33 -38.9 Dark Up 39.5 263.4 Up 11:31:33 - 12:01:33 5141
Oliver 11:46:32 -38.9 Dark Up 39.5 263.5 Up 11:31:32 - 12:01:32 5129
Anarchist Mountain Observatory 11:46:32 -38.9 Dark Up 39.4 263.8 Up 11:31:32 - 12:01:32 5123
Oroville 11:46:31 -38.9 Dark Up 39.5 263.8 Up 11:31:31 - 12:01:31 5115
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 11:46:29 -39.3 Dark Up 39.8 264.2 Up 11:31:29 - 12:01:29 5040
Manson/Chelan 11:46:29 -39.6 Dark Up 40.1 264.1 Up 11:31:29 - 12:01:29 5012
Entiat 11:46:28 -39.7 Dark Up 40.2 264.2 Up 11:31:28 - 12:01:28 4993
Wenatchee 11:46:28 -39.8 Dark Up 40.3 264.3 Up 11:31:28 - 12:01:28 4970
Niwot 11:45:48 -29.3 Dark Up 29.2 279.6 Low 11:30:48 - 12:00:48 4935
Ellensburg 11:46:27 -40.0 Dark Up 40.4 264.5 Up 11:31:27 - 12:01:27 4931
SwRI 11:45:46 -29.4 Dark Up 29.2 279.6 Low 11:30:46 - 12:00:46 4923
Pasco 11:46:22 -39.2 Dark Up 39.5 266.2 Up 11:31:22 - 12:01:22 4919
PNWRO 11:46:22 -39.1 Dark Up 39.4 266.6 Up 11:31:22 - 12:01:22 4907
Yakima 11:46:26 -40.1 Dark Up 40.5 264.8 Up 11:31:26 - 12:01:26 4898
Toppenish/White Swan 11:46:25 -40.0 Dark Up 40.4 265.2 Up 11:31:25 - 12:01:25 4887
George/Umatilla 11:46:22 -39.4 Dark Up 39.7 266.3 Up 11:31:22 - 12:01:22 4885
Goldendale 11:46:24 -40.4 Dark Up 40.8 265.3 Up 11:31:24 - 12:01:24 4829
The Dalles 11:46:24 -40.7 Dark Up 41.0 265.2 Up 11:31:24 - 12:01:24 4799
Maupin 11:46:22 -40.7 Dark Up 41.0 265.7 Up 11:31:22 - 12:01:22 4769
Madras/Culver 11:46:21 -40.9 Dark Up 41.1 266.1 Up 11:31:21 - 12:01:21 4723
Redmond 11:46:19 -40.9 Dark Up 41.1 266.4 Up 11:31:19 - 12:01:19 4693
Sisters 11:46:21 -41.2 Dark Up 41.4 266.0 Up 11:31:21 - 12:01:21 4681
Bend 11:46:20 -41.1 Dark Up 41.2 266.4 Up 11:31:20 - 12:01:20 4670
Oregon Observatory 11:46:19 -41.2 Dark Up 41.3 266.5 Up 11:31:19 - 12:01:19 4652
La Pine/Gilchrist 11:46:19 -41.3 Dark Up 41.4 266.6 Up 11:31:19 - 12:01:19 4633
North Lake 11:46:16 -40.9 Dark Up 41.0 267.4 Up 11:31:16 - 12:01:16 4618
Paisley 11:46:14 -40.7 Dark Up 40.8 268.2 Up 11:31:14 - 12:01:14 4584
Lakeview 11:46:12 -40.7 Dark Up 40.6 268.7 Up 11:31:12 - 12:01:12 4549
Chiloquin 11:46:16 -41.7 Dark Up 41.7 267.4 Up 11:31:16 - 12:01:16 4528
Klamath Falls 11:46:15 -41.7 Dark Up 41.7 267.7 Up 11:31:15 - 12:01:15 4502
Cedarville 11:46:10 -40.6 Dark Up 40.5 269.4 Up 11:31:10 - 12:01:10 4500
Tulelake 11:46:14 -41.5 Dark Up 41.5 268.2 Up 11:31:14 - 12:01:14 4490
Fall River/Burney 11:46:11 -41.6 Dark Up 41.4 269.0 Up 11:31:11 - 12:01:11 4416
Susanville 11:46:07 -41.1 Dark Up 40.9 270.0 Up 11:31:07 - 12:01:07 4389
Gimple 11:46:07 -41.3 Dark Up 41.1 270.1 Up 11:31:07 - 12:01:07 4358
Greenville 11:46:08 -41.3 Dark Up 41.1 270.1 Up 11:31:08 - 12:01:08 4355
Reno 11:46:04 -40.5 Dark Up 40.3 271.3 Up 11:31:04 - 12:01:04 4345
Portola 11:46:06 -41.0 Dark Up 40.8 270.7 Up 11:31:06 - 12:01:06 4344
Quincy 11:46:07 -41.4 Dark Up 41.1 270.3 Up 11:31:07 - 12:01:07 4338
Yerington 11:46:01 -40.1 Dark Up 39.7 272.2 Up 11:31:01 - 12:01:01 4322
Carson City 11:46:03 -40.5 Dark Up 40.2 271.6 Up 11:31:03 - 12:01:03 4315
Tonopah 11:45:55 -38.6 Dark Up 38.2 274.1 Up 11:30:55 - 12:00:55 4315
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 4296
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 4235
Beatty 11:45:52 -38.2 Dark Up 37.7 275.2 Up 11:30:52 - 12:00:52 4233
Henderson 11:45:46 -36.8 Dark Up 36.3 276.8 Up 11:30:46 - 12:00:46 4227
DCO 11:45:41 -35.3 Dark Up 34.7 278.3 Up 11:30:41 - 12:00:41 4218
Patrick 11:45:43 -35.9 Dark Up 35.3 277.8 Up 11:30:43 - 12:00:43 4216
Bishop 11:45:55 -39.5 Dark Up 39.1 273.9 Up 11:30:55 - 12:00:55 4210
Kingman/Dolan Springs 11:45:43 -36.0 Dark Up 35.4 277.8 Up 11:30:43 - 12:00:43 4190
Searchlight/Boulder City 11:45:45 -36.8 Dark Up 36.1 277.2 Up 11:30:45 - 12:00:45 4180
Laughlin/Bullhead City 11:45:44 -36.5 Dark Up 35.8 277.6 Up 11:30:44 - 12:00:44 4167
Lone Pine 11:45:53 -39.3 Dark Up 38.8 274.7 Up 11:30:53 - 12:00:53 4157
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
Blythe 11:45:40 -36.4 Dark Up 35.6 278.7 Up 11:30:40 - 12:00:40 4031
Idyllwild 11:45:43 -38.2 Dark Up 37.4 277.6 Up 11:30:43 - 12:00:43 3957
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
CPSLO 11:45:55 -41.4 Dark Up 40.7 274.4 Up 11:30:55 - 12:00:55 3943
Wildwood 11:45:47 -39.7 Dark Up 39.0 276.4 Up 11:30:47 - 12:00:47 3914

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         07:45:18.0 +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 2019/06/08 13:22:51 UT

Marc W. Buie, Southwest Research Institute

RECON