RECON: TNO occultation with 523800

Event between (523800) 17KZ31 and star GA1180:03133496 with event index number of 2432113

Geocentric closest approach at 2026/02/20 05:13:26 UTC

J2000 position of star is 08:12:50.9 +28:08:59
Equinox of date position of star is 08:14:12.8 +28:04:53
Stellar brightness G=13.8, use SENSEUP=64 with the MallinCam and and exposure time of 1 seconds with the QHY174 camera.
Star is 113 degrees from the moon. Moon is 9% illuminated.
TNO apparent brightness V=23.0

[RECON map]
TNO is 18.2 AU from the Sun and 17.3 AU from the Earth.
The TNO is moving 32.5 km/sec on the sky relative to the star, or, 9.3 arcsec/hr.
The 1-sigma error in the time of the event is 85 seconds.
The 1-sigma cross-track error in the shadow position is 1791 km.
The sky-plane scale is 12580.0 km/arcsec.

The TNO has an absolute magnitude Hv=10.3
Diameter=51.3 km assuming a 5% albedo -- 1.6 sec chord
Diameter=20.9 km assuming a 30% albedo -- 0.7 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 523800, (2026/02/20 05:14UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:54.9 +27:57:39  1.1  6.08 107
15 Cnc         08:14:45.8 +29:34:34  5.6  1.51 113
PPM 098489     08:15:29.1 +27:41:52  8.3  0.44 113
PPM 098479     08:15:07.0 +28:12:41  9.0  0.20 113
523800         08:14:26.9 +28:04:10 13.8       113
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 31.1 km RECON observability=1.0 and success probability=18.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 05:13:44 -41.8 Dark Down 66.1 178.8 Up 05:06:10 - 05:21:18 3981
Kamloops 05:14:14 -35.8 Dark Down 64.8 147.9 Up 05:06:40 - 05:21:48 3688
Kelowna 05:14:12 -36.7 Dark Down 65.8 148.7 Up 05:06:38 - 05:21:46 3609
Peachland 05:14:12 -36.6 Dark Down 65.8 148.0 Up 05:06:38 - 05:21:46 3595
Summerland 05:14:13 -36.7 Dark Down 66.0 148.0 Up 05:06:39 - 05:21:47 3580
Penticton 05:14:12 -36.8 Dark Down 66.1 148.1 Up 05:06:38 - 05:21:46 3574
Oliver 05:14:12 -37.0 Dark Down 66.4 147.7 Up 05:06:38 - 05:21:46 3537
Anarchist Mountain Observatory 05:14:12 -37.2 Dark Down 66.6 147.9 Up 05:06:38 - 05:21:46 3521
Tonasket 05:14:12 -37.3 Dark Down 66.8 147.4 Up 05:06:38 - 05:21:46 3488
Okanogan 05:14:12 -37.4 Dark Down 67.0 146.6 Up 05:06:38 - 05:21:46 3452
Victoria 05:14:21 -35.1 Dark Down 65.4 139.4 Up 05:06:47 - 05:21:55 3446
Brewster 05:14:13 -37.4 Dark Down 67.2 145.8 Up 05:06:39 - 05:21:47 3422
Manson/Chelan 05:14:13 -37.3 Dark Down 67.2 144.8 Up 05:06:39 - 05:21:47 3397
Wenatchee 05:14:14 -37.4 Dark Down 67.5 143.8 Up 05:06:40 - 05:21:48 3346
Ellensburg 05:14:14 -37.5 Dark Down 67.8 142.8 Up 05:06:40 - 05:21:48 3301
Yakima 05:14:15 -37.7 Dark Down 68.1 142.1 Up 05:06:41 - 05:21:49 3257
Toppenish/White Swan 05:14:14 -37.9 Dark Down 68.3 142.1 Up 05:06:40 - 05:21:48 3235
PNWRO 05:14:11 -39.0 Dark Down 69.3 144.8 Up 05:06:37 - 05:21:45 3207
Goldendale 05:14:15 -37.9 Dark Down 68.6 140.4 Up 05:06:41 - 05:21:49 3174
The Dalles 05:14:16 -37.7 Dark Down 68.6 139.2 Up 05:06:42 - 05:21:50 3147
Maupin 05:14:16 -38.0 Dark Down 69.0 138.8 Up 05:06:42 - 05:21:50 3103
Sisters 05:14:17 -38.1 Dark Down 69.4 136.2 Up 05:06:43 - 05:21:51 3006
Bend 05:14:16 -38.3 Dark Down 69.7 136.3 Up 05:06:42 - 05:21:50 2982
Oregon Observatory 05:14:16 -38.3 Dark Down 69.7 135.7 Up 05:06:42 - 05:21:50 2962
North Lake 05:14:15 -39.0 Dark Down 70.5 135.6 Up 05:06:41 - 05:21:49 2897
Chiloquin 05:14:17 -38.6 Dark Down 70.4 132.2 Up 05:06:43 - 05:21:51 2818
Lakeview 05:14:14 -39.8 Dark Down 71.5 134.6 Up 05:06:40 - 05:21:48 2787
Klamath Falls 05:14:17 -38.8 Dark Down 70.7 131.6 Up 05:06:43 - 05:21:51 2781
Dunrhomin 05:13:35 -50.4 Dark Down 77.9 180.7 Up 05:06:01 - 05:21:09 2773
CU-SBO 05:13:35 -50.5 Dark Down 78.1 180.3 Up 05:06:01 - 05:21:09 2745
Cedarville 05:14:13 -40.2 Dark Down 72.1 133.6 Up 05:06:39 - 05:21:47 2717
Fall River/Burney 05:14:16 -39.5 Dark Down 71.7 129.8 Up 05:06:42 - 05:21:50 2656
Susanville 05:14:14 -40.3 Dark Down 72.5 129.9 Up 05:06:40 - 05:21:48 2592
Gimple 05:14:15 -40.2 Dark Down 72.6 128.7 Up 05:06:41 - 05:21:49 2560
Greenville 05:14:15 -40.2 Dark Down 72.5 128.6 Up 05:06:41 - 05:21:49 2560
Quincy 05:14:15 -40.3 Dark Down 72.7 128.1 Up 05:06:41 - 05:21:49 2538
Portola 05:14:14 -40.6 Dark Down 73.0 128.8 Up 05:06:40 - 05:21:48 2528
Reno 05:14:12 -41.2 Dark Down 73.6 129.6 Up 05:06:38 - 05:21:46 2504
Carson City 05:14:12 -41.4 Dark Down 73.8 128.6 Up 05:06:38 - 05:21:46 2465
Yerington 05:14:10 -41.9 Dark Down 74.3 129.6 Up 05:06:36 - 05:21:44 2449
Gardnerville 05:14:12 -41.5 Dark Down 74.0 128.1 Up 05:06:38 - 05:21:46 2438
Hawthorne 05:14:09 -42.5 Dark Down 74.9 129.6 Up 05:06:35 - 05:21:43 2403
Tonopah 05:14:05 -43.6 Dark Down 76.1 131.8 Up 05:06:31 - 05:21:39 2365
Lee Vining 05:14:10 -42.3 Dark Down 75.0 126.7 Up 05:06:36 - 05:21:44 2336
Bishop 05:14:08 -43.1 Dark Down 75.8 126.6 Up 05:06:34 - 05:21:42 2278
Beatty 05:14:03 -44.4 Dark Down 77.1 129.4 Up 05:06:29 - 05:21:37 2243
Indian Springs 05:14:00 -45.4 Dark Down 77.9 131.4 Up 05:06:26 - 05:21:34 2219
Henderson 05:13:58 -46.1 Dark Down 78.7 131.7 Up 05:06:24 - 05:21:32 2169
Patrick 05:13:55 -47.2 Dark Down 79.8 133.1 Up 05:06:21 - 05:21:29 2114
Kingman/Dolan Springs 05:13:55 -47.1 Dark Down 79.8 131.5 Up 05:06:21 - 05:21:29 2088
Laughlin/Bullhead City 05:13:57 -46.7 Dark Down 79.5 129.6 Up 05:06:23 - 05:21:31 2079
Mohave Valley 05:13:57 -46.9 Dark Down 79.7 128.4 Up 05:06:23 - 05:21:31 2049
Lake Havasu City 05:13:56 -47.2 Dark Down 80.1 127.5 Up 05:06:22 - 05:21:30 2008
Parker 05:13:56 -47.4 Dark Down 80.3 126.0 Up 05:06:22 - 05:21:30 1970
George/Scottsdale 05:13:49 -49.4 Dark Down 82.2 133.5 Up 05:06:15 - 05:21:23 1957
Wildwood 05:14:07 -44.1 Dark Down 77.3 114.4 Up 05:06:33 - 05:21:41 1916
Idyllwild 05:14:02 -45.7 Dark Down 78.9 117.1 Up 05:06:28 - 05:21:36 1896
Calipatria 05:13:59 -46.8 Dark Down 80.0 117.2 Up 05:06:25 - 05:21:33 1843
Yuma 05:13:56 -47.7 Dark Down 80.9 117.4 Up 05:06:22 - 05:21:30 1807

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 523800, (2026/02/20 05:14UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1  6.08 107
15 Cnc         08:13:08.9 +29:39:23  5.6  1.51 113
PPM 098489     08:13:53.5 +27:46:42  8.3  0.44 113
PPM 098479     08:13:31.0 +28:17:31  9.0  0.20 113
523800         08:12:50.9 +28:08:59 13.8       113
Positions are for J2000

Event circumstances last updated at 2022/04/18 23:19:24 UT

Marc W. Buie, Southwest Research Institute

RECON