RECON: TNO occultation with 523766

Event between (523766) 14WF510 and star GA0880:00586967 with event index number of 2178798

Geocentric closest approach at 2025/12/04 05:51:41 UTC

J2000 position of star is 05:14:32.8 -00:45:33
Equinox of date position of star is 05:15:45.8 -00:43:59
Stellar brightness G=16.3, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 32 degrees from the moon. Moon is 99% illuminated.
Apparent brightness V=22.1

[RECON map]
Object is 32.4 AU from the Sun and 31.5 AU from the Earth.
Apparent velocity is 24.7 km/sec on the sky relative to the star, or, 3.9 arcsec/hr.
The 1-sigma error in the time of the event is 88 seconds.
The 1-sigma cross-track error in the shadow position is 1193 km.
The sky-plane scale is 22831.4 km/arcsec.

The object has an absolute magnitude Hv=7.0
Diameter=238.8 km assuming a 5% albedo -- 9.8 sec chord
Diameter=97.5 km assuming a 30% albedo -- 4.0 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 523766, (2025/12/04 05:51UT)
Object            RA         Dec     mag  sep  mel
Rigel          05:15:47.1 -08:10:25  0.1  7.44  39
34Del Ori      05:33:19.9 -00:16:55  2.2  4.39  35
PPM 187787     05:12:37.5 -02:27:39  6.0  1.91  33
PPM 175772     05:15:56.3 -00:32:06  8.2  0.20  32
523766         05:15:52.1 -00:43:52 16.3        33
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 22.6 km RECON observability=1.0 and success probability=0.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kamloops 05:52:45 -53.4 Dark Up 29.5 135.6 Low 05:44:58 - 06:00:33 3434
Kelowna 05:52:45 -54.3 Dark Up 30.5 136.2 Up 05:44:58 - 06:00:33 3376
Sleaford 05:52:09 -57.9 Dark Up 33.7 151.7 Up 05:44:21 - 05:59:56 3375
Peachland 05:52:47 -54.3 Dark Up 30.4 135.9 Up 05:44:59 - 06:00:34 3372
Summerland 05:52:47 -54.4 Dark Up 30.6 135.9 Up 05:44:59 - 06:00:34 3362
Penticton 05:52:47 -54.5 Dark Up 30.7 136.0 Up 05:44:59 - 06:00:34 3357
Oliver 05:52:48 -54.7 Dark Up 30.9 135.8 Up 05:45:00 - 06:00:35 3335
Victoria 05:52:58 -53.1 Dark Up 29.6 131.7 Low 05:45:11 - 06:00:46 3330
Anarchist Mountain Observatory 05:52:48 -54.9 Dark Up 31.1 136.0 Up 05:45:00 - 06:00:35 3323
Okanogan 05:52:50 -55.2 Dark Up 31.5 135.5 Up 05:45:02 - 06:00:37 3284
Brewster 05:52:50 -55.3 Dark Up 31.6 135.2 Up 05:45:03 - 06:00:38 3269
Manson/Chelan 05:52:52 -55.2 Dark Up 31.6 134.7 Up 05:45:05 - 06:00:40 3260
Wenatchee 05:52:54 -55.4 Dark Up 31.8 134.3 Up 05:45:06 - 06:00:41 3231
Ellensburg 05:52:56 -55.5 Dark Up 32.0 133.9 Up 05:45:08 - 06:00:43 3206
Yakima 05:52:56 -55.8 Dark Up 32.3 133.7 Up 05:45:08 - 06:00:43 3180
Toppenish/White Swan 05:52:56 -56.0 Dark Up 32.5 133.8 Up 05:45:09 - 06:00:44 3164
PNWRO 05:52:54 -57.0 Dark Up 33.5 135.2 Up 05:45:06 - 06:00:41 3124
The Dalles 05:53:00 -56.0 Dark Up 32.7 132.6 Up 05:45:13 - 06:00:48 3120
Maupin 05:53:01 -56.3 Dark Up 33.0 132.5 Up 05:45:14 - 06:00:49 3090
Sisters 05:53:04 -56.4 Dark Up 33.3 131.6 Up 05:45:16 - 06:00:51 3036
Bend 05:53:05 -56.7 Dark Up 33.6 131.8 Up 05:45:17 - 06:00:52 3017
Oregon Observatory 05:53:05 -56.7 Dark Up 33.7 131.6 Up 05:45:18 - 06:00:53 3006
Chiloquin 05:53:10 -57.1 Dark Up 34.3 130.5 Up 05:45:22 - 06:00:57 2917
Klamath Falls 05:53:10 -57.3 Dark Up 34.6 130.4 Up 05:45:23 - 06:00:58 2892
Cedarville 05:53:08 -58.7 Dark Up 36.0 131.6 Up 05:45:20 - 06:00:55 2824
Fall River/Burney 05:53:12 -58.1 Dark Up 35.6 130.2 Up 05:45:25 - 06:01:00 2801
Greenville 05:53:13 -58.8 Dark Up 36.4 130.1 Up 05:45:26 - 06:01:01 2729
Gimple 05:53:12 -58.9 Dark Up 36.5 130.2 Up 05:45:25 - 06:01:00 2728
Quincy 05:53:13 -58.9 Dark Up 36.6 130.0 Up 05:45:26 - 06:01:01 2714
Portola 05:53:12 -59.3 Dark Up 36.9 130.4 Up 05:45:25 - 06:01:00 2699
Reno 05:53:11 -59.9 Dark Up 37.5 130.9 Up 05:45:24 - 06:00:59 2672
Carson City 05:53:12 -60.1 Dark Up 37.7 130.7 Up 05:45:25 - 06:01:00 2644
Gardnerville 05:53:13 -60.2 Dark Up 37.9 130.6 Up 05:45:25 - 06:01:00 2625
Yerington 05:53:11 -60.6 Dark Up 38.2 131.3 Up 05:45:23 - 06:00:58 2622
Hawthorne 05:53:10 -61.2 Dark Up 38.8 131.5 Up 05:45:23 - 06:00:58 2580
Dunrhomin 05:52:27 -68.2 Dark Up 44.2 147.9 Up 05:44:40 - 06:00:15 2546
Lee Vining 05:53:13 -61.1 Dark Up 38.9 130.7 Up 05:45:26 - 06:01:01 2542
Nikitin 05:52:28 -68.3 Dark Up 44.3 147.8 Up 05:44:40 - 06:00:15 2532
CU-SBO 05:52:28 -68.3 Dark Up 44.4 147.7 Up 05:44:40 - 06:00:15 2528
Bishop 05:53:12 -61.8 Dark Up 39.8 131.1 Up 05:45:25 - 06:01:00 2485
Beatty 05:53:09 -63.2 Dark Up 41.0 132.5 Up 05:45:21 - 06:00:56 2429
Patrick 05:53:03 -65.9 Dark Up 43.7 134.7 Up 05:45:15 - 06:00:50 2271
Laughlin/Bullhead City 05:53:05 -65.5 Dark Up 43.5 133.7 Up 05:45:18 - 06:00:53 2260
Wildwood 05:53:20 -62.9 Dark Up 41.7 128.7 Up 05:45:32 - 06:01:07 2221
Lake Havasu City 05:53:06 -66.0 Dark Up 44.1 133.5 Up 05:45:18 - 06:00:53 2200
Idyllwild 05:53:15 -64.5 Dark Up 43.2 130.4 Up 05:45:27 - 06:01:02 2168
George/Scottsdale 05:53:00 -68.2 Dark Up 46.1 135.8 Up 05:45:12 - 06:00:47 2103
Calipatria 05:53:12 -65.6 Dark Up 44.3 131.2 Up 05:45:25 - 06:01:00 2100
Yuma 05:53:10 -66.5 Dark Up 45.2 131.9 Up 05:45:23 - 06:00:58 2052

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 523766, (2025/12/04 05:51UT)
Object            RA         Dec     mag  sep  mel
Rigel          05:14:32.3 -08:12:06  0.1  7.44  39
34Del Ori      05:32:00.4 -00:17:57  2.2  4.39  35
PPM 187787     05:11:19.3 -02:29:27  6.0  1.91  33
PPM 175772     05:14:36.9 -00:33:47  8.2  0.20  32
523766         05:14:32.8 -00:45:33 16.3        32
Positions are for J2000

Event circumstances last updated at 2023/11/15 03:54:44 UT

Marc W. Buie, Southwest Research Institute

RECON