RECON: TNO occultation with 523730

Event between (523730) 14OH394 and star GA0760:24018259 with event index number of 2328880

Geocentric closest approach at 2025/10/08 05:43:30 UTC

J2000 position of star is 21:06:15.3 -12:00:25
Equinox of date position of star is 21:07:33.1 -11:54:37
Stellar brightness G=17.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 75 degrees from the moon. Moon is 98% illuminated.
Apparent brightness V=22.2

[RECON map]
Object is 40.3 AU from the Sun and 39.8 AU from the Earth.
Apparent velocity is 9.9 km/sec on the sky relative to the star, or, 1.2 arcsec/hr.
The 1-sigma error in the time of the event is 221 seconds.
The 1-sigma cross-track error in the shadow position is 1789 km.
The sky-plane scale is 28855.3 km/arcsec.

The object has an absolute magnitude Hv=6.0
Diameter=363.1 km assuming a 5% albedo -- 37.7 sec chord
Diameter=148.2 km assuming a 30% albedo -- 15.4 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 523730, (2025/10/08 06:04UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:59:04.0 -29:29:06  1.2 31.28  61
Tarazed        19:47:29.1 +10:40:40  2.7 30.11  88
13Nu Aqr       21:10:59.7 -11:15:57  4.5  1.04  74
PPM 238375     21:07:54.7 -11:51:04  8.4  0.08  75
523730         21:07:39.5 -11:54:09 17.0        75
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 4.1 sigma about the mid-time.
The median site spacing is 26.0 km RECON observability=1.0 and success probability=2.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kamloops 05:37:14 -37.6 Dark Up 23.8 206.3 Low 05:22:14 - 05:52:14 4488
Victoria 05:37:31 -37.7 Dark Up 26.5 203.6 Low 05:22:31 - 05:52:31 4449
Peachland 05:37:13 -38.5 Dark Up 24.4 207.1 Low 05:22:13 - 05:52:13 4411
Kelowna 05:37:09 -38.5 Dark Up 24.2 207.4 Low 05:22:09 - 05:52:09 4408
Summerland 05:37:09 -38.6 Dark Up 24.5 207.2 Low 05:22:09 - 05:52:09 4398
Penticton 05:37:07 -38.7 Dark Up 24.6 207.3 Low 05:22:07 - 05:52:07 4390
Oliver 05:37:09 -39.0 Dark Up 24.9 207.4 Low 05:22:09 - 05:52:09 4368
Anarchist Mountain Observatory 05:37:08 -39.2 Dark Up 25.0 207.6 Low 05:22:08 - 05:52:08 4351
Okanogan 05:37:08 -39.6 Dark Up 25.6 207.6 Low 05:22:08 - 05:52:08 4315
Brewster 05:37:09 -39.7 Dark Up 25.9 207.4 Low 05:22:09 - 05:52:09 4304
Manson/Chelan 05:37:13 -39.7 Dark Up 26.2 207.1 Low 05:22:13 - 05:52:13 4302
Wenatchee 05:37:12 -39.9 Dark Up 26.7 207.0 Low 05:22:12 - 05:52:12 4276
Ellensburg 05:37:10 -40.1 Dark Up 27.1 206.9 Low 05:22:10 - 05:52:10 4256
Yakima 05:37:12 -40.4 Dark Up 27.5 207.0 Low 05:22:12 - 05:52:12 4229
Toppenish/White Swan 05:37:13 -40.6 Dark Up 27.6 207.2 Low 05:22:13 - 05:52:13 4208
The Dalles 05:37:14 -40.8 Dark Up 28.6 206.6 Low 05:22:14 - 05:52:14 4182
Maupin 05:37:14 -41.1 Dark Up 28.9 206.8 Low 05:22:14 - 05:52:14 4150
Sleaford 05:36:05 -41.4 Dark Up 17.8 219.9 Really Low 05:21:05 - 05:51:05 4144
PNWRO 05:37:02 -41.6 Dark Up 27.5 208.8 Low 05:22:02 - 05:52:02 4132
Sisters 05:37:19 -41.5 Dark Up 29.8 206.5 Low 05:22:19 - 05:52:19 4106
Bend 05:37:17 -41.7 Dark Up 30.0 206.8 Low 05:22:17 - 05:52:17 4080
Oregon Observatory 05:37:17 -41.8 Dark Up 30.2 206.7 Up 05:22:17 - 05:52:17 4073
Chiloquin 05:37:21 -42.4 Dark Up 31.5 206.7 Up 05:22:21 - 05:52:21 3994
Klamath Falls 05:37:21 -42.7 Dark Up 31.8 206.8 Up 05:22:21 - 05:52:21 3966
Fall River/Burney 05:37:15 -43.7 Dark Up 32.7 207.6 Up 05:22:15 - 05:52:15 3866
Cedarville 05:37:10 -44.0 Dark Up 31.8 208.7 Up 05:22:10 - 05:52:10 3857
Greenville 05:37:14 -44.5 Dark Up 33.3 208.3 Up 05:22:14 - 05:52:14 3782
Gimple 05:37:14 -44.6 Dark Up 33.3 208.4 Up 05:22:14 - 05:52:14 3779
Quincy 05:37:14 -44.6 Dark Up 33.5 208.4 Up 05:22:14 - 05:52:14 3766
Portola 05:37:10 -45.0 Dark Up 33.5 208.9 Up 05:22:10 - 05:52:10 3739
Reno 05:37:07 -45.5 Dark Up 33.4 209.7 Up 05:22:07 - 05:52:07 3695
Carson City 05:37:07 -45.8 Dark Up 33.7 209.9 Up 05:22:07 - 05:52:07 3666
Gardnerville 05:37:07 -46.0 Dark Up 33.9 210.0 Up 05:22:07 - 05:52:07 3646
Yerington 05:37:03 -46.3 Dark Up 33.7 210.6 Up 05:22:03 - 05:52:03 3627
Hawthorne 05:36:58 -46.9 Dark Up 33.9 211.3 Up 05:21:58 - 05:51:58 3571
Lee Vining 05:37:03 -47.0 Dark Up 34.5 211.0 Up 05:22:03 - 05:52:03 3546
Bishop 05:37:00 -47.8 Dark Up 34.8 212.0 Up 05:22:00 - 05:52:00 3471
Beatty 05:36:46 -49.0 Dark Up 34.5 213.8 Up 05:21:46 - 05:51:46 3370
Wildwood 05:37:00 -49.7 Dark Up 37.6 213.0 Up 05:22:00 - 05:52:00 3213
Dunrhomin 05:35:39 -52.1 Dark Up 26.3 223.7 Low 05:20:39 - 05:50:39 3209
Nikitin 05:35:39 -52.2 Dark Up 26.5 223.8 Low 05:20:39 - 05:50:39 3194
CU-SBO 05:35:40 -52.2 Dark Up 26.5 223.7 Low 05:20:40 - 05:50:40 3192
Laughlin/Bullhead City 05:36:32 -51.5 Dark Up 34.9 216.7 Up 05:21:32 - 05:51:32 3141
Patrick 05:36:27 -51.7 Dark Up 34.3 217.3 Up 05:21:27 - 05:51:27 3134
Idyllwild 05:36:49 -51.1 Dark Up 37.0 215.2 Up 05:21:49 - 05:51:49 3107
Lake Havasu City 05:36:30 -52.1 Dark Up 35.3 217.3 Up 05:21:30 - 05:51:30 3074
Calipatria 05:36:39 -52.3 Dark Up 37.0 216.7 Up 05:21:39 - 05:51:39 3007
Yuma 05:36:33 -53.1 Dark Up 36.9 217.8 Up 05:21:33 - 05:51:33 2934
George/Scottsdale 05:36:15 -54.1 Dark Up 34.7 220.1 Up 05:21:15 - 05:51:15 2910

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 523730, (2025/10/08 06:04UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.6 -29:37:24  1.2 31.28  61
Tarazed        19:46:15.6 +10:36:48  2.7 30.11  88
13Nu Aqr       21:09:35.8 -11:22:18  4.5  1.04  74
PPM 238375     21:06:30.5 -11:57:21  8.4  0.08  75
523730         21:06:15.3 -12:00:25 17.0        75
Positions are for J2000

Event circumstances last updated at 2023/10/24 02:43:01 UT

Marc W. Buie, Southwest Research Institute

RECON