RECON: TNO occultation with 523764

Event between (523764) 14WC510 and star GA0920:02462609 with event index number of 2613447

Geocentric closest approach at 2025/11/30 07:46:22 UTC

J2000 position of star is 07:15:09.4 +02:10:11
Equinox of date position of star is 07:16:24.8 +02:07:34
Stellar brightness G=16.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 106 degrees from the moon. Moon is 72% illuminated.
Apparent brightness V=22.0

[RECON map]
Object is 29.8 AU from the Sun and 29.1 AU from the Earth.
Apparent velocity is 17.8 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 157 seconds.
The 1-sigma cross-track error in the shadow position is 1193 km.
The sky-plane scale is 21072.7 km/arcsec.

The object has an absolute magnitude Hv=7.2
Diameter=212.8 km assuming a 5% albedo -- 12.0 sec chord
Diameter=86.9 km assuming a 30% albedo -- 4.9 sec chord
Dynamical classification is 3:2E+6:4II
 
 
 
 
 
 

Star training set for 523764, (2025/11/30 07:49UT)
Object            RA         Dec     mag  sep  mel
Sirius         06:46:17.5 -16:45:07 -1.5 20.29  99
Alhena         06:39:12.5 +16:22:30  1.9 16.95  95
PPM 152385     07:20:43.6 +02:41:28  5.9  1.20 107
PPM 152289     07:17:57.2 +01:49:49  7.6  0.47 106
PPM 152250     07:16:43.5 +02:01:39  9.6  0.11 106
523764         07:16:30.3 +02:07:22 16.6       106
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 19.9 km RECON observability=1.0 and success probability=0.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kamloops 07:47:48 -61.0 Dark Up 29.6 128.7 Low 07:34:12 - 08:01:24 3462
Kelowna 07:47:49 -61.8 Dark Up 30.6 129.2 Up 07:34:13 - 08:01:25 3402
Peachland 07:47:50 -61.9 Dark Up 30.5 128.9 Up 07:34:14 - 08:01:26 3400
Summerland 07:47:50 -62.1 Dark Up 30.6 128.9 Up 07:34:14 - 08:01:26 3390
Penticton 07:47:50 -62.2 Dark Up 30.7 129.0 Up 07:34:14 - 08:01:26 3385
Victoria 07:48:04 -63.0 Dark Up 29.4 124.8 Low 07:34:28 - 08:01:40 3380
Oliver 07:47:51 -62.5 Dark Up 31.0 128.8 Up 07:34:15 - 08:01:27 3364
Anarchist Mountain Observatory 07:47:52 -62.7 Dark Up 31.2 129.0 Up 07:34:16 - 08:01:28 3351
Sleaford 07:46:59 -57.8 Dark Up 34.7 144.5 Up 07:33:23 - 08:00:35 3331
Okanogan 07:47:55 -63.3 Dark Up 31.5 128.4 Up 07:34:19 - 08:01:31 3315
Brewster 07:47:57 -63.6 Dark Up 31.5 128.1 Up 07:34:21 - 08:01:33 3302
Manson/Chelan 07:47:59 -63.8 Dark Up 31.5 127.7 Up 07:34:23 - 08:01:35 3294
Wenatchee 07:48:02 -64.3 Dark Up 31.7 127.3 Up 07:34:26 - 08:01:38 3268
Ellensburg 07:48:03 -64.7 Dark Up 31.8 126.8 Up 07:34:27 - 08:01:39 3245
Yakima 07:48:04 -65.1 Dark Up 32.0 126.6 Up 07:34:28 - 08:01:40 3220
Toppenish/White Swan 07:48:05 -65.3 Dark Up 32.3 126.7 Up 07:34:29 - 08:01:41 3204
The Dalles 07:48:11 -66.1 Dark Up 32.3 125.5 Up 07:34:35 - 08:01:47 3166
PNWRO 07:48:03 -65.7 Dark Up 33.3 128.0 Up 07:34:27 - 08:01:39 3157
Maupin 07:48:12 -66.5 Dark Up 32.6 125.4 Up 07:34:36 - 08:01:48 3137
Sisters 07:48:17 -67.4 Dark Up 32.8 124.5 Up 07:34:41 - 08:01:53 3087
Bend 07:48:17 -67.6 Dark Up 33.1 124.6 Up 07:34:41 - 08:01:53 3067
Oregon Observatory 07:48:19 -67.8 Dark Up 33.1 124.4 Up 07:34:43 - 08:01:55 3058
Chiloquin 07:48:25 -69.1 Dark Up 33.6 123.3 Up 07:34:49 - 08:02:01 2975
Klamath Falls 07:48:26 -69.4 Dark Up 33.9 123.2 Up 07:34:50 - 08:02:02 2950
Cedarville 07:48:23 -70.2 Dark Up 35.3 124.3 Up 07:34:47 - 08:01:59 2875
Fall River/Burney 07:48:29 -70.6 Dark Up 34.8 122.9 Up 07:34:53 - 08:02:05 2861
Greenville 07:48:31 -71.5 Dark Up 35.6 122.8 Up 07:34:55 - 08:02:07 2788
Gimple 07:48:31 -71.5 Dark Up 35.6 122.9 Up 07:34:55 - 08:02:07 2786
Quincy 07:48:32 -71.7 Dark Up 35.7 122.7 Up 07:34:56 - 08:02:08 2773
Portola 07:48:32 -71.9 Dark Up 36.1 123.1 Up 07:34:56 - 08:02:08 2756
Reno 07:48:30 -72.2 Dark Up 36.6 123.5 Up 07:34:54 - 08:02:06 2726
Carson City 07:48:31 -72.5 Dark Up 36.8 123.3 Up 07:34:55 - 08:02:07 2699
Gardnerville 07:48:32 -72.8 Dark Up 37.0 123.2 Up 07:34:56 - 08:02:08 2680
Yerington 07:48:30 -72.7 Dark Up 37.3 123.8 Up 07:34:54 - 08:02:06 2673
Hawthorne 07:48:29 -73.1 Dark Up 37.9 124.0 Up 07:34:53 - 08:02:05 2629
Lee Vining 07:48:33 -73.7 Dark Up 37.9 123.2 Up 07:34:57 - 08:02:09 2595
Bishop 07:48:33 -74.3 Dark Up 38.8 123.5 Up 07:34:57 - 08:02:09 2536
Dunrhomin 07:47:33 -67.7 Dark Up 44.4 139.5 Up 07:33:57 - 08:01:09 2512
Nikitin 07:47:34 -67.9 Dark Up 44.6 139.4 Up 07:33:58 - 08:01:10 2498
CU-SBO 07:47:34 -67.9 Dark Up 44.6 139.3 Up 07:33:58 - 08:01:10 2495
Beatty 07:48:29 -74.5 Dark Up 40.1 124.7 Up 07:34:53 - 08:02:05 2470
Patrick 07:48:22 -75.3 Dark Up 42.8 126.6 Up 07:34:46 - 08:01:58 2298
Laughlin/Bullhead City 07:48:26 -75.7 Dark Up 42.5 125.7 Up 07:34:50 - 08:02:02 2291
Wildwood 07:48:45 -77.5 Dark Up 40.4 121.1 Up 07:35:09 - 08:02:21 2280
Lake Havasu City 07:48:28 -76.3 Dark Up 43.1 125.4 Up 07:34:52 - 08:02:04 2232
Idyllwild 07:48:39 -77.6 Dark Up 41.9 122.5 Up 07:35:03 - 08:02:15 2216
Calipatria 07:48:36 -77.9 Dark Up 43.1 123.2 Up 07:35:00 - 08:02:12 2142
George/Scottsdale 07:48:20 -76.0 Dark Up 45.2 127.4 Up 07:34:44 - 08:01:56 2119
Yuma 07:48:35 -78.0 Dark Up 43.9 123.7 Up 07:34:59 - 08:02:11 2088

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 523764, (2025/11/30 07:49UT)
Object            RA         Dec     mag  sep  mel
Sirius         06:45:08.0 -16:43:24 -1.5 20.29  99
Alhena         06:37:42.8 +16:23:57  1.9 16.95  95
PPM 152385     07:19:22.4 +02:44:26  5.9  1.20 107
PPM 152289     07:16:36.5 +01:52:41  7.6  0.47 106
PPM 152250     07:15:22.7 +02:04:28  9.6  0.11 106
523764         07:15:09.4 +02:10:11 16.6       106
Positions are for J2000

Event circumstances last updated at 2024/03/03 06:09:36 UT

Marc W. Buie, Southwest Research Institute

RECON