RECON: TNO occultation with 523620

Event between (523620) 07RH283 and star GA1220:01876216 with event index number of 2387399

Geocentric closest approach at 2025/11/27 10:12:49 UTC

J2000 position of star is 05:32:36.5 +32:27:18
Equinox of date position of star is 05:34:03.8 +32:28:09
Stellar brightness G=15.1, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 119 degrees from the moon. Moon is 41% illuminated.
TNO apparent brightness V=21.9

[RECON map]
TNO is 21.3 AU from the Sun and 20.4 AU from the Earth.
The TNO is moving 23.7 km/sec on the sky relative to the star, or, 5.8 arcsec/hr.
The 1-sigma error in the time of the event is 112 seconds.
The 1-sigma cross-track error in the shadow position is 1063 km.
The sky-plane scale is 14765.3 km/arcsec.

The TNO has an absolute magnitude Hv=8.6
Diameter=114.8 km assuming a 5% albedo -- 4.9 sec chord
Diameter=46.9 km assuming a 30% albedo -- 2.0 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 523620, (2025/11/27 10:13UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:24.6 +16:33:34  0.8 20.46 104
Alnath         05:27:55.9 +28:37:37  1.6  4.08 118
25Chi Aur      05:34:25.0 +32:12:31  4.8  0.26 119
PPM 070534     05:35:09.2 +32:49:01  6.5  0.39 119
PPM 070496     05:33:23.4 +32:28:33  9.1  0.19 119
523620         05:34:18.0 +32:28:18 15.1       119
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 32.0 km RECON observability=1.0 and success probability=29.9%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 10:11:21 -40.8 Dark Down 60.6 240.1 Up 10:01:32 - 10:21:11 -674
Kamloops 10:11:58 -49.4 Dark Down 68.3 219.1 Up 10:02:09 - 10:21:48 -975
Kelowna 10:11:55 -49.4 Dark Down 68.5 222.2 Up 10:02:06 - 10:21:45 -1055
Peachland 10:11:56 -49.6 Dark Down 68.7 221.8 Up 10:02:07 - 10:21:46 -1068
Summerland 10:11:56 -49.6 Dark Down 68.8 222.3 Up 10:02:06 - 10:21:45 -1083
Penticton 10:11:55 -49.6 Dark Down 68.8 222.6 Up 10:02:06 - 10:21:45 -1090
Oliver 10:11:55 -49.8 Dark Down 69.1 223.2 Up 10:02:06 - 10:21:45 -1127
Anarchist Mountain Observatory 10:11:54 -49.8 Dark Down 69.1 223.9 Up 10:02:05 - 10:21:44 -1144
Tonasket 10:11:54 -50.0 Dark Down 69.4 224.3 Up 10:02:05 - 10:21:44 -1177
Okanogan 10:11:55 -50.2 Dark Down 69.7 224.7 Up 10:02:05 - 10:21:44 -1214
Victoria 10:12:06 -52.3 Dark Down 71.2 216.2 Up 10:02:17 - 10:21:56 -1220
Brewster 10:11:55 -50.5 Dark Down 70.0 224.8 Up 10:02:05 - 10:21:44 -1244
Manson/Chelan 10:11:56 -50.8 Dark Down 70.3 224.4 Up 10:02:06 - 10:21:45 -1269
Wenatchee 10:11:56 -51.1 Dark Down 70.7 225.0 Up 10:02:07 - 10:21:46 -1321
Ellensburg 10:11:57 -51.5 Dark Down 71.1 225.4 Up 10:02:07 - 10:21:46 -1366
Yakima 10:11:56 -51.7 Dark Down 71.4 226.2 Up 10:02:07 - 10:21:46 -1410
Toppenish/White Swan 10:11:55 -51.7 Dark Down 71.4 227.0 Up 10:02:06 - 10:21:45 -1432
PNWRO 10:11:51 -50.9 Dark Down 70.9 230.9 Up 10:02:01 - 10:21:40 -1461
Goldendale 10:11:56 -52.2 Dark Down 72.0 227.4 Up 10:02:07 - 10:21:46 -1494
The Dalles 10:11:58 -52.5 Dark Down 72.4 227.1 Up 10:02:08 - 10:21:47 -1521
Maupin 10:11:57 -52.7 Dark Down 72.6 228.3 Up 10:02:07 - 10:21:46 -1566
Sisters 10:11:58 -53.4 Dark Down 73.4 229.4 Up 10:02:09 - 10:21:48 -1664
Bend 10:11:57 -53.3 Dark Down 73.5 230.6 Up 10:02:08 - 10:21:47 -1688
Oregon Observatory 10:11:58 -53.5 Dark Down 73.6 230.7 Up 10:02:08 - 10:21:47 -1708
North Lake 10:11:55 -53.4 Dark Down 73.7 233.6 Up 10:02:06 - 10:21:45 -1774
Chiloquin 10:11:58 -54.3 Dark Down 74.7 233.4 Up 10:02:09 - 10:21:48 -1854
Lakeview 10:11:53 -53.5 Dark Down 74.0 237.8 Up 10:02:04 - 10:21:43 -1885
Klamath Falls 10:11:58 -54.4 Dark Down 74.8 234.7 Up 10:02:08 - 10:21:47 -1891
Dunrhomin 10:11:02 -43.2 Dark Down 64.0 262.4 Up 10:01:12 - 10:20:51 -1893
CU-SBO 10:11:02 -43.3 Dark Down 64.1 262.9 Up 10:01:13 - 10:20:52 -1922
Cedarville 10:11:52 -53.6 Dark Down 74.2 240.1 Up 10:02:02 - 10:21:41 -1955
Fall River/Burney 10:11:56 -54.7 Dark Down 75.3 239.2 Up 10:02:06 - 10:21:45 -2017
Susanville 10:11:53 -54.4 Dark Down 75.1 242.7 Up 10:02:04 - 10:21:43 -2081
Gimple 10:11:53 -54.7 Dark Down 75.3 243.3 Up 10:02:04 - 10:21:43 -2113
Greenville 10:11:54 -54.7 Dark Down 75.4 243.1 Up 10:02:04 - 10:21:43 -2113
Quincy 10:11:54 -54.8 Dark Down 75.5 243.8 Up 10:02:04 - 10:21:43 -2135
Portola 10:11:52 -54.5 Dark Down 75.2 245.1 Up 10:02:03 - 10:21:42 -2145
Reno 10:11:49 -54.1 Dark Down 74.9 247.2 Up 10:02:00 - 10:21:39 -2170
Carson City 10:11:50 -54.2 Dark Down 75.0 248.5 Up 10:02:00 - 10:21:39 -2209
Yerington 10:11:47 -53.8 Dark Down 74.6 250.2 Up 10:01:58 - 10:21:37 -2225
Gardnerville 10:11:49 -54.3 Dark Down 75.0 249.4 Up 10:01:59 - 10:21:38 -2235
Hawthorne 10:11:45 -53.6 Dark Down 74.4 252.6 Up 10:01:55 - 10:21:34 -2271
Tonopah 10:11:40 -52.7 Dark Down 73.4 256.0 Up 10:01:50 - 10:21:29 -2308
Lee Vining 10:11:46 -54.1 Dark Down 74.9 253.8 Up 10:01:57 - 10:21:36 -2337
Bishop 10:11:43 -53.8 Dark Down 74.5 256.9 Up 10:01:54 - 10:21:33 -2397
Beatty 10:11:37 -52.6 Dark Down 73.3 260.3 Up 10:01:48 - 10:21:27 -2431
Indian Springs 10:11:33 -51.9 Dark Down 72.5 262.4 Up 10:01:44 - 10:21:23 -2454
Henderson 10:11:30 -51.4 Dark Down 72.1 264.7 Up 10:01:41 - 10:21:20 -2505
Patrick 10:11:26 -50.7 Dark Down 71.2 267.4 Up 10:01:37 - 10:21:16 -2559
Kingman/Dolan Springs 10:11:27 -50.9 Dark Down 71.4 267.9 Up 10:01:37 - 10:21:16 -2586
Laughlin/Bullhead City 10:11:28 -51.3 Dark Down 71.8 267.7 Up 10:01:39 - 10:21:18 -2595
Mohave Valley 10:11:28 -51.3 Dark Down 71.8 268.5 Up 10:01:39 - 10:21:18 -2625
Lake Havasu City 10:11:27 -51.2 Dark Down 71.6 269.8 Up 10:01:38 - 10:21:17 -2666
Parker 10:11:27 -51.2 Dark Down 71.6 270.9 Up 10:01:37 - 10:21:16 -2704
George/Scottsdale 10:11:18 -49.3 Dark Down 69.6 273.3 Up 10:01:28 - 10:21:07 -2716
Wildwood 10:11:42 -54.7 Dark Down 75.1 268.6 Up 10:01:53 - 10:21:32 -2759
Idyllwild 10:11:35 -53.2 Dark Down 73.5 271.0 Up 10:01:46 - 10:21:25 -2778
Calipatria 10:11:30 -52.4 Dark Down 72.5 273.5 Up 10:01:41 - 10:21:20 -2831
Yuma 10:11:27 -51.7 Dark Down 71.8 275.1 Up 10:01:37 - 10:21:16 -2867

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 523620, (2025/11/27 10:13UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 20.46 104
Alnath         05:26:17.6 +28:36:23  1.6  4.08 118
25Chi Aur      05:32:43.7 +32:11:31  4.8  0.26 119
PPM 070534     05:33:27.4 +32:48:03  6.5  0.39 119
PPM 070496     05:31:41.9 +32:27:31  9.1  0.19 119
523620         05:32:36.5 +32:27:18 15.1       119
Positions are for J2000

Event circumstances last updated at 2022/04/11 23:05:37 UT

Marc W. Buie, Southwest Research Institute

RECON