RECON: TNO occultation with 523800

Event between (523800) 17KZ31 and star GA1180:03133496 with event index number of 1524738

Geocentric closest approach at 2026/02/20 05:12:18 UTC

J2000 position of star is 08:12:50.9 +28:08:59
Equinox of date position of star is 08:14:04.9 +28:05:16
Stellar brightness G=13.8, use SENSEUP=64
Star is 113 degrees from the moon. Moon is 9% illuminated.
TNO apparent brightness V=22.7

[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 284 seconds.
The 1-sigma cross-track error in the shadow position is 5788 km.
The sky-plane scale is 12580.0 km/arcsec.

The TNO has an absolute magnitude Hv=10.0
Diameter=55.0 km assuming a 5% albedo -- 1.9 sec chord
Diameter=22.4 km assuming a 30% albedo -- 0.8 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 523800, (2026/02/20 05:12UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:55.0 +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 3.2 sigma about the mid-time.
The median site spacing is 24.8 km RECON observability=1.0 and success probability=8.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Clarence Fulton 05:13:05 -36.4 Dark Down 65.4 148.9 Up 04:58:05 - 05:28:05 3593
Kelowna 05:13:06 -36.5 Dark Down 65.7 148.1 Up 04:58:06 - 05:28:06 3552
Peachland 05:13:06 -36.4 Dark Down 65.7 147.4 Up 04:58:06 - 05:28:06 3538
Summerland 05:13:06 -36.6 Dark Down 65.9 147.4 Up 04:58:06 - 05:28:06 3523
Penticton 05:13:06 -36.7 Dark Down 66.0 147.6 Up 04:58:06 - 05:28:06 3517
Oliver 05:13:06 -36.8 Dark Down 66.3 147.1 Up 04:58:06 - 05:28:06 3480
Anarchist Mountain Observatory 05:13:05 -37.0 Dark Down 66.5 147.3 Up 04:58:05 - 05:28:05 3464
Tonasket 05:13:06 -37.1 Dark Down 66.7 146.8 Up 04:58:06 - 05:28:06 3431
Okanogan 05:13:06 -37.2 Dark Down 66.9 146.1 Up 04:58:06 - 05:28:06 3394
Victoria 05:13:14 -34.9 Dark Down 65.3 138.9 Up 04:58:14 - 05:28:14 3389
Brewster 05:13:07 -37.2 Dark Down 67.1 145.3 Up 04:58:07 - 05:28:07 3364
Manson/Chelan 05:13:07 -37.1 Dark Down 67.1 144.3 Up 04:58:07 - 05:28:07 3340
Entiat 05:13:07 -37.2 Dark Down 67.3 143.8 Up 04:58:07 - 05:28:07 3316
Wenatchee 05:13:08 -37.3 Dark Down 67.4 143.2 Up 04:58:08 - 05:28:08 3289
Ellensburg 05:13:08 -37.3 Dark Down 67.7 142.2 Up 04:58:08 - 05:28:08 3244
Yakima 05:13:08 -37.5 Dark Down 68.0 141.5 Up 04:58:08 - 05:28:08 3200
Toppenish/White Swan 05:13:08 -37.7 Dark Down 68.2 141.5 Up 04:58:08 - 05:28:08 3178
Pasco 05:13:05 -38.5 Dark Down 68.8 144.0 Up 04:58:05 - 05:28:05 3174
PNWRO 05:13:04 -38.8 Dark Down 69.1 144.2 Up 04:58:04 - 05:28:04 3150
Goldendale 05:13:09 -37.7 Dark Down 68.5 139.8 Up 04:58:09 - 05:28:09 3117
The Dalles 05:13:09 -37.6 Dark Down 68.5 138.7 Up 04:58:09 - 05:28:09 3090
Maupin 05:13:09 -37.8 Dark Down 68.8 138.2 Up 04:58:09 - 05:28:09 3046
Sisters 05:13:10 -37.9 Dark Down 69.2 135.6 Up 04:58:10 - 05:28:10 2949
Redmond 05:13:09 -38.2 Dark Down 69.5 136.4 Up 04:58:09 - 05:28:09 2949
Bend 05:13:10 -38.2 Dark Down 69.5 135.7 Up 04:58:10 - 05:28:10 2925
Oregon Observatory 05:13:10 -38.1 Dark Down 69.6 135.1 Up 04:58:10 - 05:28:10 2905
La Pine/Gilchrist 05:13:10 -38.2 Dark Down 69.7 134.6 Up 04:58:10 - 05:28:10 2883
North Lake 05:13:09 -38.8 Dark Down 70.3 135.0 Up 04:58:09 - 05:28:09 2840
Paisley 05:13:08 -39.2 Dark Down 70.9 134.6 Up 04:58:08 - 05:28:08 2783
Lakeview 05:13:07 -39.6 Dark Down 71.4 134.0 Up 04:58:07 - 05:28:07 2729
Klamath Falls 05:13:11 -38.6 Dark Down 70.6 131.1 Up 04:58:11 - 05:28:11 2724
Niwot 05:12:28 -50.3 Dark Down 78.0 179.6 Up 04:57:28 - 05:27:28 2697
SwRI 05:12:29 -50.3 Dark Down 78.1 179.1 Up 04:57:29 - 05:27:29 2684
Cedarville 05:13:07 -40.0 Dark Down 71.9 132.9 Up 04:58:07 - 05:28:07 2659
Fall River/Burney 05:13:10 -39.3 Dark Down 71.5 129.2 Up 04:58:10 - 05:28:10 2598
Susanville 05:13:08 -40.1 Dark Down 72.4 129.3 Up 04:58:08 - 05:28:08 2535
Gimple 05:13:08 -40.0 Dark Down 72.4 128.1 Up 04:58:08 - 05:28:08 2503
Greenville 05:13:08 -40.0 Dark Down 72.4 128.0 Up 04:58:08 - 05:28:08 2503
Quincy 05:13:08 -40.1 Dark Down 72.5 127.5 Up 04:58:08 - 05:28:08 2481
Portola 05:13:08 -40.5 Dark Down 72.8 128.2 Up 04:58:08 - 05:28:08 2470
Reno 05:13:05 -41.0 Dark Down 73.4 128.9 Up 04:58:05 - 05:28:05 2446
Carson City 05:13:05 -41.2 Dark Down 73.6 128.0 Up 04:58:05 - 05:28:05 2407
Yerington 05:13:04 -41.7 Dark Down 74.1 128.9 Up 04:58:04 - 05:28:04 2391
Gardnerville 05:13:05 -41.3 Dark Down 73.8 127.5 Up 04:58:05 - 05:28:05 2381
Hawthorne 05:13:02 -42.3 Dark Down 74.8 128.9 Up 04:58:02 - 05:28:02 2345
Tonopah 05:12:59 -43.4 Dark Down 75.9 131.1 Up 04:57:59 - 05:27:59 2307
Lee Vining 05:13:03 -42.1 Dark Down 74.8 126.1 Up 04:58:03 - 05:28:03 2279
Bishop 05:13:01 -42.9 Dark Down 75.6 126.0 Up 04:58:01 - 05:28:01 2220
Beatty 05:12:57 -44.2 Dark Down 76.9 128.6 Up 04:57:57 - 05:27:57 2185
Indian Springs 05:12:54 -45.2 Dark Down 77.8 130.6 Up 04:57:54 - 05:27:54 2161
Henderson 05:12:52 -45.9 Dark Down 78.5 130.8 Up 04:57:52 - 05:27:52 2110
Patrick 05:12:49 -47.0 Dark Down 79.6 132.1 Up 04:57:49 - 05:27:49 2056
Searchlight/Boulder City 05:12:51 -46.2 Dark Down 79.0 128.7 Up 04:57:51 - 05:27:51 2048
DCO 05:12:46 -47.6 Dark Down 80.3 133.4 Up 04:57:46 - 05:27:46 2031
Kingman/Dolan Springs 05:12:49 -46.9 Dark Down 79.7 130.5 Up 04:57:49 - 05:27:49 2029
Laughlin/Bullhead City 05:12:51 -46.5 Dark Down 79.4 128.6 Up 04:57:51 - 05:27:51 2020
Mohave Valley 05:12:50 -46.7 Dark Down 79.5 127.5 Up 04:57:50 - 05:27:50 1990
CPSLO 05:13:07 -41.9 Dark Down 75.1 114.3 Up 04:58:07 - 05:28:07 1975
Lake Havasu City 05:12:50 -47.0 Dark Down 79.9 126.6 Up 04:57:50 - 05:27:50 1949
Parker 05:12:49 -47.2 Dark Down 80.2 125.0 Up 04:57:49 - 05:27:49 1911
George/Scottsdale 05:12:42 -49.2 Dark Down 82.0 132.2 Up 04:57:42 - 05:27:42 1898
Wildwood 05:13:01 -43.9 Dark Down 77.1 113.8 Up 04:58:01 - 05:28:01 1859
Blythe 05:12:50 -47.1 Dark Down 80.2 121.5 Up 04:57:50 - 05:27:50 1850
Idyllwild 05:12:56 -45.5 Dark Down 78.7 116.4 Up 04:57:56 - 05:27:56 1838
Calipatria 05:12:52 -46.6 Dark Down 79.8 116.4 Up 04:57:52 - 05:27:52 1784
Yuma 05:12:50 -47.5 Dark Down 80.7 116.6 Up 04:57:50 - 05:27:50 1748

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 05:12UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:18.0 +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 2020/02/28 23:28:25 UT

Marc W. Buie, Southwest Research Institute

RECON