RECON: TNO occultation with 593617

Event between (593617) 15RN278 and star GA0980:00136108 with event index number of 2690437

Geocentric closest approach at 2026/10/04 05:13:58 UTC

J2000 position of star is 01:34:26.8 +08:52:56
Equinox of date position of star is 01:35:36.4 +08:59:41
Stellar brightness G=16.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 85 degrees from the moon. Moon is 43% illuminated.
TNO apparent brightness V=24.0

[RECON map]
TNO is 35.8 AU from the Sun and 34.9 AU from the Earth.
The TNO is moving 24.1 km/sec on the sky relative to the star, or, 3.4 arcsec/hr.
The 1-sigma error in the time of the event is 238 seconds.
The 1-sigma cross-track error in the shadow position is 3164 km.
The sky-plane scale is 25288.8 km/arcsec.

The TNO has an absolute magnitude Hv=8.5
Diameter=119.7 km assuming a 5% albedo -- 5.0 sec chord
Diameter=48.9 km assuming a 30% albedo -- 2.0 sec chord
Dynamical classification is 5:4E

Star training set for 593617, (2026/10/04 05:14UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:27.5 +16:33:40  0.8 44.82  41
6Bet Ari       01:56:07.4 +20:56:16  2.6 12.88  75
PPM 144653     01:30:27.1 +07:25:53  6.4  2.08  86
PPM 144767     01:36:17.0 +08:24:39  7.8  0.62  85
PPM 144746     01:35:19.7 +08:47:58  9.5  0.25  85
593617         01:35:51.3 +09:01:07 16.7        84
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 3.8 sigma about the mid-time.
The median site spacing is 17.1 km RECON observability=1.0 and success probability=5.0%

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

Kamloops 05:14:50 -33.4 Dark Down 30.1 115.3 Up 04:59:50 - 05:29:50 6416

Victoria 05:15:02 -33.3 Dark Down 29.2 111.4 Low 05:00:02 - 05:30:02 6392

Peachland 05:14:52 -34.3 Dark Down 30.9 115.3 Up 04:59:52 - 05:29:52 6358

Kelowna 05:14:51 -34.4 Dark Down 31.0 115.7 Up 04:59:51 - 05:29:51 6355

Summerland 05:14:53 -34.5 Dark Down 31.0 115.3 Up 04:59:53 - 05:29:53 6349

Penticton 05:14:53 -34.6 Dark Down 31.1 115.4 Up 04:59:53 - 05:29:53 6342

Oliver 05:14:54 -34.8 Dark Down 31.2 115.2 Up 04:59:54 - 05:29:54 6326

Anarchist Mountain Observatory 05:14:55 -35.0 Dark Down 31.4 115.3 Up 04:59:55 - 05:29:55 6313

Tonasket 05:14:56 -35.2 Dark Down 31.5 115.1 Up 04:59:56 - 05:29:56 6299

Okanogan 05:14:57 -35.3 Dark Down 31.6 114.7 Up 04:59:57 - 05:29:57 6286

Brewster 05:14:59 -35.4 Dark Down 31.6 114.4 Up 04:59:59 - 05:29:59 6278

Manson/Chelan 05:15:00 -35.4 Dark Down 31.4 114.0 Up 05:00:00 - 05:30:00 6278

Wenatchee 05:15:02 -35.6 Dark Down 31.5 113.6 Up 05:00:02 - 05:30:02 6258

Ellensburg 05:15:03 -35.7 Dark Down 31.6 113.1 Up 05:00:03 - 05:30:03 6243

Yakima 05:15:05 -36.0 Dark Down 31.7 112.9 Up 05:00:05 - 05:30:05 6223

Toppenish/White Swan 05:15:06 -36.2 Dark Down 31.9 112.9 Up 05:00:06 - 05:30:06 6207

Goldendale 05:15:07 -36.3 Dark Down 31.8 112.2 Up 05:00:07 - 05:30:07 6190

The Dalles 05:15:07 -36.3 Dark Down 31.7 111.8 Up 05:00:07 - 05:30:07 6188

Maupin 05:15:07 -36.6 Dark Down 31.9 111.6 Up 05:00:07 - 05:30:07 6163

PNWRO 05:15:05 -37.3 Dark Down 33.0 114.1 Up 05:00:05 - 05:30:05 6147

Sisters 05:15:07 -36.9 Dark Down 31.9 110.7 Up 05:00:07 - 05:30:07 6132

Bend 05:15:07 -37.1 Dark Down 32.2 110.8 Up 05:00:07 - 05:30:07 6112

Sleaford 05:14:20 -38.1 Dark Up 36.9 130.5 Up 04:59:20 - 05:29:20 6109

Oregon Observatory 05:15:07 -37.2 Dark Down 32.1 110.6 Up 05:00:07 - 05:30:07 6107

North Lake 05:15:07 -37.9 Dark Down 32.7 110.6 Up 05:00:07 - 05:30:07 6058

Chiloquin 05:15:07 -37.7 Dark Down 32.3 109.4 Up 05:00:07 - 05:30:07 6052

Klamath Falls 05:15:07 -37.9 Dark Down 32.5 109.3 Up 05:00:07 - 05:30:07 6032

Lakeview 05:15:07 -38.8 Dark Down 33.5 110.5 Up 05:00:07 - 05:30:07 5985

Fall River/Burney 05:15:07 -38.9 Dark Down 33.1 108.9 Up 05:00:07 - 05:30:07 5958

Cedarville 05:15:07 -39.3 Dark Down 33.8 110.2 Up 05:00:07 - 05:30:07 5944

Susanville 05:15:07 -39.7 Dark Down 33.9 109.1 Up 05:00:07 - 05:30:07 5901

Greenville 05:15:31 -39.7 Dark Down 33.8 108.8 Up 05:00:31 - 05:30:31 5869

Gimple 05:15:30 -39.8 Dark Down 33.9 108.8 Up 05:00:30 - 05:30:30 5866

Quincy 05:15:31 -39.8 Dark Down 33.9 108.6 Up 05:00:31 - 05:30:31 5856

Portola 05:15:31 -40.2 Dark Down 34.3 108.9 Up 05:00:31 - 05:30:31 5834

Reno 05:15:30 -40.8 Dark Down 34.8 109.3 Up 05:00:30 - 05:30:30 5798

Carson City 05:15:32 -41.0 Dark Down 35.0 109.1 Up 05:00:32 - 05:30:32 5775

Gardnerville 05:15:33 -41.2 Dark Down 35.1 109.0 Up 05:00:33 - 05:30:33 5758

Yerington 05:15:31 -41.5 Dark Down 35.5 109.5 Up 05:00:31 - 05:30:31 5743

Hawthorne 05:15:32 -42.1 Dark Down 36.0 109.6 Up 05:00:32 - 05:30:32 5697

Lee Vining 05:15:35 -42.1 Dark Down 35.9 108.8 Up 05:00:35 - 05:30:35 5676

Tonopah 05:15:31 -43.3 Dark Down 37.2 110.4 Up 05:00:31 - 05:30:31 5622

Bishop 05:15:35 -43.0 Dark Down 36.6 109.0 Up 05:00:35 - 05:30:35 5613

Beatty 05:15:34 -44.3 Dark Down 38.0 110.0 Up 05:00:34 - 05:30:34 5529

Indian Springs 05:15:32 -45.2 Dark Down 38.9 110.6 Up 05:00:32 - 05:30:32 5472

Henderson 05:15:33 -45.9 Dark Down 39.6 110.8 Up 05:00:33 - 05:30:33 5411

Wildwood 05:15:47 -44.7 Dark Down 37.5 106.5 Up 05:00:47 - 05:30:47 5394

Dunrhomin 05:14:57 -48.3 Dark Down 44.5 123.3 Up 04:59:57 - 05:29:57 5375

Laughlin/Bullhead City 05:15:35 -46.7 Dark Down 40.3 110.4 Up 05:00:35 - 05:30:35 5336

Patrick 05:15:33 -47.0 Dark Down 40.7 111.2 Up 05:00:33 - 05:30:33 5330

Kingman/Dolan Springs 05:15:34 -47.1 Dark Down 40.6 110.9 Up 05:00:34 - 05:30:34 5321

Mohave Valley 05:15:35 -46.9 Dark Down 40.4 110.2 Up 05:00:35 - 05:30:35 5316

Idyllwild 05:15:45 -46.2 Dark Down 39.1 107.7 Up 05:00:45 - 05:30:45 5307

Lake Havasu City 05:15:37 -47.3 Dark Down 40.7 110.1 Up 05:00:37 - 05:30:37 5279

Parker 05:15:38 -47.6 Dark Down 40.8 109.8 Up 05:00:38 - 05:30:38 5253

Calipatria 05:15:43 -47.3 Dark Down 40.2 108.1 Up 05:00:43 - 05:30:43 5221

Yuma 05:15:43 -48.2 Dark Down 41.1 108.4 Up 05:00:43 - 05:30:43 5158

George/Scottsdale 05:15:33 -49.4 Dark Down 42.9 111.5 Up 05:00:33 - 05:30:33 5138

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 593617, (2026/10/04 05:14UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 44.82  41
6Bet Ari       01:54:38.6 +20:48:26  2.6 12.88  75
PPM 144653     01:29:03.1 +07:17:38  6.4  2.08  86
PPM 144767     01:34:52.6 +08:16:29  7.8  0.62  85
PPM 144746     01:33:55.2 +08:39:47  9.5  0.25  85
593617         01:34:26.8 +08:52:56 16.7        85
Positions are for J2000

Event circumstances last updated at 2022/01/17 00:28:37 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	05:14:50	-33.4	Dark	Down	30.1	115.3	Up	04:59:50 - 05:29:50	6416
Victoria	05:15:02	-33.3	Dark	Down	29.2	111.4	Low	05:00:02 - 05:30:02	6392
Peachland	05:14:52	-34.3	Dark	Down	30.9	115.3	Up	04:59:52 - 05:29:52	6358
Kelowna	05:14:51	-34.4	Dark	Down	31.0	115.7	Up	04:59:51 - 05:29:51	6355
Summerland	05:14:53	-34.5	Dark	Down	31.0	115.3	Up	04:59:53 - 05:29:53	6349
Penticton	05:14:53	-34.6	Dark	Down	31.1	115.4	Up	04:59:53 - 05:29:53	6342
Oliver	05:14:54	-34.8	Dark	Down	31.2	115.2	Up	04:59:54 - 05:29:54	6326
Anarchist Mountain Observatory	05:14:55	-35.0	Dark	Down	31.4	115.3	Up	04:59:55 - 05:29:55	6313
Tonasket	05:14:56	-35.2	Dark	Down	31.5	115.1	Up	04:59:56 - 05:29:56	6299
Okanogan	05:14:57	-35.3	Dark	Down	31.6	114.7	Up	04:59:57 - 05:29:57	6286
Brewster	05:14:59	-35.4	Dark	Down	31.6	114.4	Up	04:59:59 - 05:29:59	6278
Manson/Chelan	05:15:00	-35.4	Dark	Down	31.4	114.0	Up	05:00:00 - 05:30:00	6278
Wenatchee	05:15:02	-35.6	Dark	Down	31.5	113.6	Up	05:00:02 - 05:30:02	6258
Ellensburg	05:15:03	-35.7	Dark	Down	31.6	113.1	Up	05:00:03 - 05:30:03	6243
Yakima	05:15:05	-36.0	Dark	Down	31.7	112.9	Up	05:00:05 - 05:30:05	6223
Toppenish/White Swan	05:15:06	-36.2	Dark	Down	31.9	112.9	Up	05:00:06 - 05:30:06	6207
Goldendale	05:15:07	-36.3	Dark	Down	31.8	112.2	Up	05:00:07 - 05:30:07	6190
The Dalles	05:15:07	-36.3	Dark	Down	31.7	111.8	Up	05:00:07 - 05:30:07	6188
Maupin	05:15:07	-36.6	Dark	Down	31.9	111.6	Up	05:00:07 - 05:30:07	6163
PNWRO	05:15:05	-37.3	Dark	Down	33.0	114.1	Up	05:00:05 - 05:30:05	6147
Sisters	05:15:07	-36.9	Dark	Down	31.9	110.7	Up	05:00:07 - 05:30:07	6132
Bend	05:15:07	-37.1	Dark	Down	32.2	110.8	Up	05:00:07 - 05:30:07	6112
Sleaford	05:14:20	-38.1	Dark	Up	36.9	130.5	Up	04:59:20 - 05:29:20	6109
Oregon Observatory	05:15:07	-37.2	Dark	Down	32.1	110.6	Up	05:00:07 - 05:30:07	6107
North Lake	05:15:07	-37.9	Dark	Down	32.7	110.6	Up	05:00:07 - 05:30:07	6058
Chiloquin	05:15:07	-37.7	Dark	Down	32.3	109.4	Up	05:00:07 - 05:30:07	6052
Klamath Falls	05:15:07	-37.9	Dark	Down	32.5	109.3	Up	05:00:07 - 05:30:07	6032
Lakeview	05:15:07	-38.8	Dark	Down	33.5	110.5	Up	05:00:07 - 05:30:07	5985
Fall River/Burney	05:15:07	-38.9	Dark	Down	33.1	108.9	Up	05:00:07 - 05:30:07	5958
Cedarville	05:15:07	-39.3	Dark	Down	33.8	110.2	Up	05:00:07 - 05:30:07	5944
Susanville	05:15:07	-39.7	Dark	Down	33.9	109.1	Up	05:00:07 - 05:30:07	5901
Greenville	05:15:31	-39.7	Dark	Down	33.8	108.8	Up	05:00:31 - 05:30:31	5869
Gimple	05:15:30	-39.8	Dark	Down	33.9	108.8	Up	05:00:30 - 05:30:30	5866
Quincy	05:15:31	-39.8	Dark	Down	33.9	108.6	Up	05:00:31 - 05:30:31	5856
Portola	05:15:31	-40.2	Dark	Down	34.3	108.9	Up	05:00:31 - 05:30:31	5834
Reno	05:15:30	-40.8	Dark	Down	34.8	109.3	Up	05:00:30 - 05:30:30	5798
Carson City	05:15:32	-41.0	Dark	Down	35.0	109.1	Up	05:00:32 - 05:30:32	5775
Gardnerville	05:15:33	-41.2	Dark	Down	35.1	109.0	Up	05:00:33 - 05:30:33	5758
Yerington	05:15:31	-41.5	Dark	Down	35.5	109.5	Up	05:00:31 - 05:30:31	5743
Hawthorne	05:15:32	-42.1	Dark	Down	36.0	109.6	Up	05:00:32 - 05:30:32	5697
Lee Vining	05:15:35	-42.1	Dark	Down	35.9	108.8	Up	05:00:35 - 05:30:35	5676
Tonopah	05:15:31	-43.3	Dark	Down	37.2	110.4	Up	05:00:31 - 05:30:31	5622
Bishop	05:15:35	-43.0	Dark	Down	36.6	109.0	Up	05:00:35 - 05:30:35	5613
Beatty	05:15:34	-44.3	Dark	Down	38.0	110.0	Up	05:00:34 - 05:30:34	5529
Indian Springs	05:15:32	-45.2	Dark	Down	38.9	110.6	Up	05:00:32 - 05:30:32	5472
Henderson	05:15:33	-45.9	Dark	Down	39.6	110.8	Up	05:00:33 - 05:30:33	5411
Wildwood	05:15:47	-44.7	Dark	Down	37.5	106.5	Up	05:00:47 - 05:30:47	5394
Dunrhomin	05:14:57	-48.3	Dark	Down	44.5	123.3	Up	04:59:57 - 05:29:57	5375
Laughlin/Bullhead City	05:15:35	-46.7	Dark	Down	40.3	110.4	Up	05:00:35 - 05:30:35	5336
Patrick	05:15:33	-47.0	Dark	Down	40.7	111.2	Up	05:00:33 - 05:30:33	5330
Kingman/Dolan Springs	05:15:34	-47.1	Dark	Down	40.6	110.9	Up	05:00:34 - 05:30:34	5321
Mohave Valley	05:15:35	-46.9	Dark	Down	40.4	110.2	Up	05:00:35 - 05:30:35	5316
Idyllwild	05:15:45	-46.2	Dark	Down	39.1	107.7	Up	05:00:45 - 05:30:45	5307
Lake Havasu City	05:15:37	-47.3	Dark	Down	40.7	110.1	Up	05:00:37 - 05:30:37	5279
Parker	05:15:38	-47.6	Dark	Down	40.8	109.8	Up	05:00:38 - 05:30:38	5253
Calipatria	05:15:43	-47.3	Dark	Down	40.2	108.1	Up	05:00:43 - 05:30:43	5221
Yuma	05:15:43	-48.2	Dark	Down	41.1	108.4	Up	05:00:43 - 05:30:43	5158
George/Scottsdale	05:15:33	-49.4	Dark	Down	42.9	111.5	Up	05:00:33 - 05:30:33	5138