RECON: TNO occultation with 531682

Event between (531682) 12UB178 and star GA1020:00483559 with event index number of 2444965

Geocentric closest approach at 2025/12/25 03:51:48 UTC

J2000 position of star is 04:31:38.4 +13:17:59
Equinox of date position of star is 04:33:00.8 +13:21:02
Stellar brightness G=16.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 97 degrees from the moon. Moon is 23% illuminated.
Apparent brightness V=22.9

[RECON map]
Object is 47.3 AU from the Sun and 46.4 AU from the Earth.
Apparent velocity is 23.4 km/sec on the sky relative to the star, or, 2.5 arcsec/hr.
The 1-sigma error in the time of the event is 1139 seconds.
The 1-sigma cross-track error in the shadow position is 4777 km.
The sky-plane scale is 33653.5 km/arcsec.

The object has an absolute magnitude Hv=6.1
Diameter=380.2 km assuming a 5% albedo -- 15.7 sec chord
Diameter=155.2 km assuming a 30% albedo -- 6.4 sec chord
Dynamical classification is CLASSICAL

Star training set for 531682, (2025/12/25 03:52UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:24.9 +16:33:34  0.8  3.37  98
Bellatrix      05:26:31.6 +06:22:16  1.6 14.89 108
83 Tau         04:32:05.3 +13:46:44  5.7  0.49  96
PPM 120021     04:35:14.3 +13:18:17  7.0  0.52  97
PPM 119984     04:32:59.0 +13:24:14  8.6  0.06  97
531682         04:33:05.9 +13:21:13 16.8        97
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 0.8 sigma about the mid-time.
The median site spacing is 31.5 km RECON observability=1.0 and success probability=7.0%

Site Site mid-time
(UT) Sun alt
(deg) Sky Moon Star alt
(deg) Star az
(deg) Target Observing Time
(UT) X-track
(km)

Kamloops 03:53:16 -35.4 Dark Up 42.6 129.0 Up 03:38:16 - 04:08:16 -5132

Sleaford 03:52:36 -43.8 Dark Up 47.5 147.7 Up 03:37:36 - 04:07:36 -5196

Kelowna 03:53:15 -36.1 Dark Up 43.5 129.4 Up 03:38:15 - 04:08:15 -5210

Peachland 03:53:16 -35.9 Dark Up 43.5 129.0 Up 03:38:16 - 04:08:16 -5215

Summerland 03:53:17 -36.0 Dark Up 43.6 129.0 Up 03:38:17 - 04:08:17 -5229

Penticton 03:53:17 -36.1 Dark Up 43.7 129.1 Up 03:38:17 - 04:08:17 -5236

Victoria 03:53:28 -33.6 Dark Up 42.3 124.0 Up 03:38:28 - 04:08:28 -5263

Oliver 03:53:17 -36.1 Dark Up 43.9 128.8 Up 03:38:17 - 04:08:17 -5265

Anarchist Mountain Observatory 03:53:17 -36.2 Dark Up 44.1 128.9 Up 03:38:17 - 04:08:17 -5282

Okanogan 03:53:19 -36.2 Dark Up 44.4 128.2 Up 03:38:19 - 04:08:19 -5332

Brewster 03:53:20 -36.0 Dark Up 44.5 127.7 Up 03:38:20 - 04:08:20 -5352

Manson/Chelan 03:53:21 -35.8 Dark Up 44.4 127.1 Up 03:38:21 - 04:08:21 -5364

Wenatchee 03:53:23 -35.7 Dark Up 44.6 126.6 Up 03:38:23 - 04:08:23 -5402

Ellensburg 03:53:25 -35.6 Dark Up 44.7 126.0 Up 03:38:25 - 04:08:25 -5433

Yakima 03:53:25 -35.6 Dark Up 45.0 125.7 Up 03:38:25 - 04:08:25 -5468

Toppenish/White Swan 03:53:25 -35.7 Dark Up 45.2 125.7 Up 03:38:25 - 04:08:25 -5489

PNWRO 03:53:22 -36.8 Dark Up 46.2 127.1 Up 03:38:22 - 04:08:22 -5543

The Dalles 03:53:30 -35.2 Dark Up 45.2 124.2 Up 03:38:30 - 04:08:30 -5544

Maupin 03:53:30 -35.3 Dark Up 45.5 123.9 Up 03:38:30 - 04:08:30 -5582

Sisters 03:53:33 -35.0 Dark Up 45.7 122.7 Up 03:38:33 - 04:08:33 -5650

Bend 03:53:34 -35.2 Dark Up 46.0 122.7 Up 03:38:34 - 04:08:34 -5675

Oregon Observatory 03:53:34 -35.1 Dark Up 46.0 122.4 Up 03:38:34 - 04:08:34 -5688

Chiloquin 03:53:38 -34.8 Dark Up 46.4 120.8 Up 03:38:38 - 04:08:38 -5799

Klamath Falls 03:53:39 -34.8 Dark Up 46.7 120.6 Up 03:38:39 - 04:08:39 -5831

Cedarville 03:53:36 -36.0 Dark Up 48.0 121.7 Up 03:38:36 - 04:08:36 -5920

Fall River/Burney 03:53:40 -35.1 Dark Up 47.5 119.9 Up 03:38:40 - 04:08:40 -5944

Greenville 03:53:40 -35.4 Dark Up 48.3 119.5 Up 03:38:40 - 04:08:40 -6035

Gimple 03:53:41 -35.5 Dark Up 48.3 119.6 Up 03:38:41 - 04:08:41 -6037

Quincy 03:53:42 -35.4 Dark Up 48.4 119.4 Up 03:38:42 - 04:08:42 -6054

Portola 03:53:40 -35.8 Dark Up 48.7 119.7 Up 03:38:40 - 04:08:40 -6073

Reno 03:53:39 -36.3 Dark Up 49.3 120.2 Up 03:38:39 - 04:08:39 -6109

Carson City 03:53:39 -36.3 Dark Up 49.5 119.8 Up 03:38:39 - 04:08:39 -6143

Gardnerville 03:53:40 -36.3 Dark Up 49.7 119.6 Up 03:38:40 - 04:08:40 -6167

Yerington 03:53:37 -36.7 Dark Up 50.0 120.3 Up 03:38:37 - 04:08:37 -6172

Hawthorne 03:53:37 -37.1 Dark Up 50.6 120.4 Up 03:38:37 - 04:08:37 -6225

Dunrhomin 03:52:52 -47.3 Dark Up 57.4 139.8 Up 03:37:52 - 04:07:52 -6263

Lee Vining 03:53:40 -36.7 Dark Up 50.6 119.3 Up 03:38:40 - 04:08:40 -6270

Nikitin 03:52:52 -47.3 Dark Up 57.5 139.6 Up 03:37:52 - 04:07:52 -6280

CU-SBO 03:52:53 -47.2 Dark Up 57.5 139.4 Up 03:37:53 - 04:07:53 -6285

Bishop 03:53:38 -37.3 Dark Up 51.4 119.4 Up 03:38:38 - 04:08:38 -6339

Beatty 03:53:34 -38.6 Dark Up 52.7 120.7 Up 03:38:34 - 04:08:34 -6411

Patrick 03:53:28 -40.8 Dark Up 55.5 122.3 Up 03:38:28 - 04:08:28 -6604

Laughlin/Bullhead City 03:53:31 -40.2 Dark Up 55.1 121.2 Up 03:38:31 - 04:08:31 -6617

Wildwood 03:53:46 -36.9 Dark Up 52.7 115.5 Up 03:38:46 - 04:08:46 -6653

Lake Havasu City 03:53:31 -40.4 Dark Up 55.6 120.7 Up 03:38:31 - 04:08:31 -6687

Idyllwild 03:53:40 -38.4 Dark Up 54.3 117.1 Up 03:38:40 - 04:08:40 -6721

Calipatria 03:53:37 -39.4 Dark Up 55.4 117.6 Up 03:38:37 - 04:08:37 -6803

George/Scottsdale 03:53:24 -42.4 Dark Up 57.8 122.7 Up 03:38:24 - 04:08:24 -6805

Yuma 03:53:36 -40.1 Dark Up 56.3 118.0 Up 03:38:36 - 04:08:36 -6861

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 531682, (2025/12/25 03:52UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8  3.37  98
Bellatrix      05:25:07.8 +06:20:58  1.6 14.89 108
83 Tau         04:30:37.5 +13:43:28  5.7  0.49  96
PPM 120021     04:33:46.8 +13:15:07  7.0  0.52  97
PPM 119984     04:31:31.5 +13:20:59  8.6  0.06  97
531682         04:31:38.4 +13:17:59 16.8        97
Positions are for J2000

Event circumstances last updated at 2024/06/18 02:57:27 UT

Marc W. Buie, Southwest Research Institute

RECON

Site	Site mid-time (UT)	Sun alt (deg)	Sky	Moon	Star alt (deg)	Star az (deg)	Target	Observing Time (UT)	X-track (km)
Kamloops	03:53:16	-35.4	Dark	Up	42.6	129.0	Up	03:38:16 - 04:08:16	-5132
Sleaford	03:52:36	-43.8	Dark	Up	47.5	147.7	Up	03:37:36 - 04:07:36	-5196
Kelowna	03:53:15	-36.1	Dark	Up	43.5	129.4	Up	03:38:15 - 04:08:15	-5210
Peachland	03:53:16	-35.9	Dark	Up	43.5	129.0	Up	03:38:16 - 04:08:16	-5215
Summerland	03:53:17	-36.0	Dark	Up	43.6	129.0	Up	03:38:17 - 04:08:17	-5229
Penticton	03:53:17	-36.1	Dark	Up	43.7	129.1	Up	03:38:17 - 04:08:17	-5236
Victoria	03:53:28	-33.6	Dark	Up	42.3	124.0	Up	03:38:28 - 04:08:28	-5263
Oliver	03:53:17	-36.1	Dark	Up	43.9	128.8	Up	03:38:17 - 04:08:17	-5265
Anarchist Mountain Observatory	03:53:17	-36.2	Dark	Up	44.1	128.9	Up	03:38:17 - 04:08:17	-5282
Okanogan	03:53:19	-36.2	Dark	Up	44.4	128.2	Up	03:38:19 - 04:08:19	-5332
Brewster	03:53:20	-36.0	Dark	Up	44.5	127.7	Up	03:38:20 - 04:08:20	-5352
Manson/Chelan	03:53:21	-35.8	Dark	Up	44.4	127.1	Up	03:38:21 - 04:08:21	-5364
Wenatchee	03:53:23	-35.7	Dark	Up	44.6	126.6	Up	03:38:23 - 04:08:23	-5402
Ellensburg	03:53:25	-35.6	Dark	Up	44.7	126.0	Up	03:38:25 - 04:08:25	-5433
Yakima	03:53:25	-35.6	Dark	Up	45.0	125.7	Up	03:38:25 - 04:08:25	-5468
Toppenish/White Swan	03:53:25	-35.7	Dark	Up	45.2	125.7	Up	03:38:25 - 04:08:25	-5489
PNWRO	03:53:22	-36.8	Dark	Up	46.2	127.1	Up	03:38:22 - 04:08:22	-5543
The Dalles	03:53:30	-35.2	Dark	Up	45.2	124.2	Up	03:38:30 - 04:08:30	-5544
Maupin	03:53:30	-35.3	Dark	Up	45.5	123.9	Up	03:38:30 - 04:08:30	-5582
Sisters	03:53:33	-35.0	Dark	Up	45.7	122.7	Up	03:38:33 - 04:08:33	-5650
Bend	03:53:34	-35.2	Dark	Up	46.0	122.7	Up	03:38:34 - 04:08:34	-5675
Oregon Observatory	03:53:34	-35.1	Dark	Up	46.0	122.4	Up	03:38:34 - 04:08:34	-5688
Chiloquin	03:53:38	-34.8	Dark	Up	46.4	120.8	Up	03:38:38 - 04:08:38	-5799
Klamath Falls	03:53:39	-34.8	Dark	Up	46.7	120.6	Up	03:38:39 - 04:08:39	-5831
Cedarville	03:53:36	-36.0	Dark	Up	48.0	121.7	Up	03:38:36 - 04:08:36	-5920
Fall River/Burney	03:53:40	-35.1	Dark	Up	47.5	119.9	Up	03:38:40 - 04:08:40	-5944
Greenville	03:53:40	-35.4	Dark	Up	48.3	119.5	Up	03:38:40 - 04:08:40	-6035
Gimple	03:53:41	-35.5	Dark	Up	48.3	119.6	Up	03:38:41 - 04:08:41	-6037
Quincy	03:53:42	-35.4	Dark	Up	48.4	119.4	Up	03:38:42 - 04:08:42	-6054
Portola	03:53:40	-35.8	Dark	Up	48.7	119.7	Up	03:38:40 - 04:08:40	-6073
Reno	03:53:39	-36.3	Dark	Up	49.3	120.2	Up	03:38:39 - 04:08:39	-6109
Carson City	03:53:39	-36.3	Dark	Up	49.5	119.8	Up	03:38:39 - 04:08:39	-6143
Gardnerville	03:53:40	-36.3	Dark	Up	49.7	119.6	Up	03:38:40 - 04:08:40	-6167
Yerington	03:53:37	-36.7	Dark	Up	50.0	120.3	Up	03:38:37 - 04:08:37	-6172
Hawthorne	03:53:37	-37.1	Dark	Up	50.6	120.4	Up	03:38:37 - 04:08:37	-6225
Dunrhomin	03:52:52	-47.3	Dark	Up	57.4	139.8	Up	03:37:52 - 04:07:52	-6263
Lee Vining	03:53:40	-36.7	Dark	Up	50.6	119.3	Up	03:38:40 - 04:08:40	-6270
Nikitin	03:52:52	-47.3	Dark	Up	57.5	139.6	Up	03:37:52 - 04:07:52	-6280
CU-SBO	03:52:53	-47.2	Dark	Up	57.5	139.4	Up	03:37:53 - 04:07:53	-6285
Bishop	03:53:38	-37.3	Dark	Up	51.4	119.4	Up	03:38:38 - 04:08:38	-6339
Beatty	03:53:34	-38.6	Dark	Up	52.7	120.7	Up	03:38:34 - 04:08:34	-6411
Patrick	03:53:28	-40.8	Dark	Up	55.5	122.3	Up	03:38:28 - 04:08:28	-6604
Laughlin/Bullhead City	03:53:31	-40.2	Dark	Up	55.1	121.2	Up	03:38:31 - 04:08:31	-6617
Wildwood	03:53:46	-36.9	Dark	Up	52.7	115.5	Up	03:38:46 - 04:08:46	-6653
Lake Havasu City	03:53:31	-40.4	Dark	Up	55.6	120.7	Up	03:38:31 - 04:08:31	-6687
Idyllwild	03:53:40	-38.4	Dark	Up	54.3	117.1	Up	03:38:40 - 04:08:40	-6721
Calipatria	03:53:37	-39.4	Dark	Up	55.4	117.6	Up	03:38:37 - 04:08:37	-6803
George/Scottsdale	03:53:24	-42.4	Dark	Up	57.8	122.7	Up	03:38:24 - 04:08:24	-6805
Yuma	03:53:36	-40.1	Dark	Up	56.3	118.0	Up	03:38:36 - 04:08:36	-6861