RECON: TNO occultation with 531683

Event between (531683) 12UC178 and star GA1100:00836464 with event index number of 2445201

Geocentric closest approach at 2027/11/01 05:48:59 UTC

J2000 position of star is 05:00:22.0 +20:16:44
Equinox of date position of star is 05:01:47.9 +20:18:47
Stellar brightness G=16.3, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 172 degrees from the moon. Moon is 8% illuminated.
Apparent brightness V=23.0

[RECON map]
Object is 40.7 AU from the Sun and 39.9 AU from the Earth.
Apparent velocity is 19.3 km/sec on the sky relative to the star, or, 2.4 arcsec/hr.
The 1-sigma error in the time of the event is 295 seconds.
The 1-sigma cross-track error in the shadow position is 1617 km.
The sky-plane scale is 28942.1 km/arcsec.

The object has an absolute magnitude Hv=6.8
Diameter=263.0 km assuming a 5% albedo -- 13.5 sec chord
Diameter=107.4 km assuming a 30% albedo -- 5.5 sec chord
Dynamical classification is 5:3EE

Star training set for 531683, (2027/11/01 05:49UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:31.2 +16:33:48  0.8  6.92 170
Alnath         05:28:03.2 +28:37:43  1.6 10.20 169
102Iot Tau     05:04:45.7 +21:37:38  4.6  1.46 173
PPM 093957     05:01:53.2 +20:58:01  8.4  0.65 173
PPM 093940     05:01:04.5 +20:14:02  9.3  0.24 172
PPM 093968     05:02:27.8 +20:18:53 11.5  0.11 172
531683         05:02:00.9 +20:19:05 16.3       172
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 3.1 sigma about the mid-time.
The median site spacing is 24.8 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 05:51:40 -47.1 Dark Down 29.9 94.0 Low 05:36:40 - 06:06:40 -3649

Victoria 05:51:53 -47.2 Dark Down 28.0 90.5 Low 05:36:53 - 06:06:53 -3711

Peachland 05:51:44 -48.0 Dark Down 30.3 94.0 Up 05:36:44 - 06:06:44 -3726

Kelowna 05:51:42 -48.1 Dark Down 30.5 94.3 Up 05:36:42 - 06:06:42 -3727

Summerland 05:51:44 -48.2 Dark Down 30.4 94.0 Up 05:36:44 - 06:06:44 -3739

Penticton 05:51:44 -48.3 Dark Down 30.5 94.0 Up 05:36:44 - 06:06:44 -3746

Oliver 05:51:45 -48.5 Dark Down 30.5 93.8 Up 05:36:45 - 06:06:45 -3770

Anarchist Mountain Observatory 05:51:46 -48.7 Dark Down 30.6 93.9 Up 05:36:46 - 06:06:46 -3787

Okanogan 05:51:50 -49.1 Dark Down 30.6 93.3 Up 05:36:50 - 06:06:50 -3826

Brewster 05:51:51 -49.2 Dark Down 30.4 93.0 Up 05:36:51 - 06:06:51 -3840

Manson/Chelan 05:51:53 -49.2 Dark Down 30.2 92.6 Up 05:36:53 - 06:06:53 -3844

Wenatchee 05:51:55 -49.5 Dark Down 30.1 92.2 Up 05:36:55 - 06:06:55 -3872

Ellensburg 05:51:57 -49.7 Dark Down 30.0 91.8 Low 05:36:57 - 06:06:57 -3895

Sleaford 05:51:11 -50.6 Dark Down 38.4 107.3 Up 05:36:11 - 06:06:11 -3919

Yakima 05:51:59 -49.9 Dark Down 30.0 91.6 Low 05:36:59 - 06:06:59 -3924

Toppenish/White Swan 05:51:59 -50.2 Dark Down 30.1 91.6 Up 05:36:59 - 06:06:59 -3944

The Dalles 05:52:04 -50.3 Dark Down 29.6 90.6 Low 05:37:04 - 06:07:04 -3978

Maupin 05:52:05 -50.7 Dark Down 29.7 90.4 Low 05:37:05 - 06:07:05 -4011

PNWRO 05:51:59 -51.2 Dark Down 31.2 92.5 Up 05:36:59 - 06:06:59 -4014

Sisters 05:52:09 -51.0 Dark Down 29.3 89.6 Low 05:37:09 - 06:07:09 -4061

Bend 05:52:10 -51.3 Dark Down 29.5 89.6 Low 05:37:10 - 06:07:10 -4086

Oregon Observatory 05:52:12 -51.3 Dark Down 29.4 89.5 Low 05:37:12 - 06:07:12 -4095

Chiloquin 05:52:18 -52.0 Dark Down 29.1 88.5 Low 05:37:18 - 06:07:18 -4181

Klamath Falls 05:52:19 -52.2 Dark Down 29.2 88.3 Low 05:37:19 - 06:07:19 -4210

Fall River/Burney 05:52:23 -53.2 Dark Down 29.4 87.9 Low 05:37:23 - 06:07:23 -4313

Cedarville 05:52:19 -53.6 Dark Down 30.4 89.0 Up 05:37:19 - 06:07:19 -4313

Greenville 05:52:26 -54.0 Dark Down 29.8 87.7 Low 05:37:26 - 06:07:26 -4398

Gimple 05:52:27 -54.1 Dark Down 29.8 87.8 Low 05:37:27 - 06:07:27 -4401

Quincy 05:52:27 -54.1 Dark Down 29.8 87.6 Low 05:37:27 - 06:07:27 -4414

Portola 05:52:27 -54.5 Dark Down 30.1 87.8 Up 05:37:27 - 06:07:27 -4439

Reno 05:52:27 -55.1 Dark Down 30.6 88.1 Up 05:37:27 - 06:07:27 -4481

Carson City 05:52:28 -55.3 Dark Down 30.6 87.9 Up 05:37:28 - 06:07:28 -4511

Gardnerville 05:52:29 -55.5 Dark Down 30.6 87.8 Up 05:37:29 - 06:07:29 -4532

Yerington 05:52:28 -55.8 Dark Down 31.1 88.1 Up 05:37:28 - 06:07:28 -4547

Hawthorne 05:52:29 -56.4 Dark Down 31.5 88.2 Up 05:37:29 - 06:07:29 -4602

Lee Vining 05:52:32 -56.5 Dark Down 31.1 87.6 Up 05:37:32 - 06:07:32 -4632

Bishop 05:52:33 -57.3 Dark Down 31.7 87.6 Up 05:37:33 - 06:07:33 -4706

Beatty 05:52:31 -58.6 Dark Down 32.9 88.3 Up 05:37:31 - 06:07:31 -4798

Dunrhomin 05:51:54 -61.7 Dark Down 41.7 98.4 Up 05:36:54 - 06:06:54 -4878

Nikitin 05:51:56 -61.9 Dark Down 41.7 98.2 Up 05:36:56 - 06:06:56 -4894

CU-SBO 05:51:56 -61.9 Dark Down 41.6 98.1 Up 05:36:56 - 06:06:56 -4897

Wildwood 05:52:45 -59.1 Dark Down 31.3 85.5 Up 05:37:45 - 06:07:45 -4977

Laughlin/Bullhead City 05:52:34 -61.1 Dark Down 34.7 88.4 Up 05:37:34 - 06:07:34 -5020

Patrick 05:52:32 -61.4 Dark Down 35.2 88.9 Up 05:37:32 - 06:07:32 -5022

Idyllwild 05:52:43 -60.6 Dark Down 32.9 86.3 Up 05:37:43 - 06:07:43 -5072

Lake Havasu City 05:52:35 -61.7 Dark Down 34.9 88.1 Up 05:37:35 - 06:07:35 -5087

Calipatria 05:52:42 -61.8 Dark Down 33.8 86.5 Up 05:37:42 - 06:07:42 -5167

Yuma 05:52:41 -62.6 Dark Down 34.5 86.7 Up 05:37:41 - 06:07:41 -5237

George/Scottsdale 05:52:33 -63.7 Dark Down 36.9 88.8 Up 05:37:33 - 06:07:33 -5239

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 531683, (2027/11/01 05:49UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8  6.92 170
Alnath         05:26:17.6 +28:36:23  1.6 10.20 169
102Iot Tau     05:03:05.8 +21:35:23  4.6  1.46 173
PPM 093957     05:00:13.9 +20:55:40  8.4  0.65 173
PPM 093940     04:59:25.7 +20:11:39  9.3  0.24 172
PPM 093968     05:00:48.9 +20:16:33 11.5  0.11 172
531683         05:00:22.0 +20:16:44 16.3       172
Positions are for J2000

Event circumstances last updated at 2024/03/06 04:33:40 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	05:51:40	-47.1	Dark	Down	29.9	94.0	Low	05:36:40 - 06:06:40	-3649
Victoria	05:51:53	-47.2	Dark	Down	28.0	90.5	Low	05:36:53 - 06:06:53	-3711
Peachland	05:51:44	-48.0	Dark	Down	30.3	94.0	Up	05:36:44 - 06:06:44	-3726
Kelowna	05:51:42	-48.1	Dark	Down	30.5	94.3	Up	05:36:42 - 06:06:42	-3727
Summerland	05:51:44	-48.2	Dark	Down	30.4	94.0	Up	05:36:44 - 06:06:44	-3739
Penticton	05:51:44	-48.3	Dark	Down	30.5	94.0	Up	05:36:44 - 06:06:44	-3746
Oliver	05:51:45	-48.5	Dark	Down	30.5	93.8	Up	05:36:45 - 06:06:45	-3770
Anarchist Mountain Observatory	05:51:46	-48.7	Dark	Down	30.6	93.9	Up	05:36:46 - 06:06:46	-3787
Okanogan	05:51:50	-49.1	Dark	Down	30.6	93.3	Up	05:36:50 - 06:06:50	-3826
Brewster	05:51:51	-49.2	Dark	Down	30.4	93.0	Up	05:36:51 - 06:06:51	-3840
Manson/Chelan	05:51:53	-49.2	Dark	Down	30.2	92.6	Up	05:36:53 - 06:06:53	-3844
Wenatchee	05:51:55	-49.5	Dark	Down	30.1	92.2	Up	05:36:55 - 06:06:55	-3872
Ellensburg	05:51:57	-49.7	Dark	Down	30.0	91.8	Low	05:36:57 - 06:06:57	-3895
Sleaford	05:51:11	-50.6	Dark	Down	38.4	107.3	Up	05:36:11 - 06:06:11	-3919
Yakima	05:51:59	-49.9	Dark	Down	30.0	91.6	Low	05:36:59 - 06:06:59	-3924
Toppenish/White Swan	05:51:59	-50.2	Dark	Down	30.1	91.6	Up	05:36:59 - 06:06:59	-3944
The Dalles	05:52:04	-50.3	Dark	Down	29.6	90.6	Low	05:37:04 - 06:07:04	-3978
Maupin	05:52:05	-50.7	Dark	Down	29.7	90.4	Low	05:37:05 - 06:07:05	-4011
PNWRO	05:51:59	-51.2	Dark	Down	31.2	92.5	Up	05:36:59 - 06:06:59	-4014
Sisters	05:52:09	-51.0	Dark	Down	29.3	89.6	Low	05:37:09 - 06:07:09	-4061
Bend	05:52:10	-51.3	Dark	Down	29.5	89.6	Low	05:37:10 - 06:07:10	-4086
Oregon Observatory	05:52:12	-51.3	Dark	Down	29.4	89.5	Low	05:37:12 - 06:07:12	-4095
Chiloquin	05:52:18	-52.0	Dark	Down	29.1	88.5	Low	05:37:18 - 06:07:18	-4181
Klamath Falls	05:52:19	-52.2	Dark	Down	29.2	88.3	Low	05:37:19 - 06:07:19	-4210
Fall River/Burney	05:52:23	-53.2	Dark	Down	29.4	87.9	Low	05:37:23 - 06:07:23	-4313
Cedarville	05:52:19	-53.6	Dark	Down	30.4	89.0	Up	05:37:19 - 06:07:19	-4313
Greenville	05:52:26	-54.0	Dark	Down	29.8	87.7	Low	05:37:26 - 06:07:26	-4398
Gimple	05:52:27	-54.1	Dark	Down	29.8	87.8	Low	05:37:27 - 06:07:27	-4401
Quincy	05:52:27	-54.1	Dark	Down	29.8	87.6	Low	05:37:27 - 06:07:27	-4414
Portola	05:52:27	-54.5	Dark	Down	30.1	87.8	Up	05:37:27 - 06:07:27	-4439
Reno	05:52:27	-55.1	Dark	Down	30.6	88.1	Up	05:37:27 - 06:07:27	-4481
Carson City	05:52:28	-55.3	Dark	Down	30.6	87.9	Up	05:37:28 - 06:07:28	-4511
Gardnerville	05:52:29	-55.5	Dark	Down	30.6	87.8	Up	05:37:29 - 06:07:29	-4532
Yerington	05:52:28	-55.8	Dark	Down	31.1	88.1	Up	05:37:28 - 06:07:28	-4547
Hawthorne	05:52:29	-56.4	Dark	Down	31.5	88.2	Up	05:37:29 - 06:07:29	-4602
Lee Vining	05:52:32	-56.5	Dark	Down	31.1	87.6	Up	05:37:32 - 06:07:32	-4632
Bishop	05:52:33	-57.3	Dark	Down	31.7	87.6	Up	05:37:33 - 06:07:33	-4706
Beatty	05:52:31	-58.6	Dark	Down	32.9	88.3	Up	05:37:31 - 06:07:31	-4798
Dunrhomin	05:51:54	-61.7	Dark	Down	41.7	98.4	Up	05:36:54 - 06:06:54	-4878
Nikitin	05:51:56	-61.9	Dark	Down	41.7	98.2	Up	05:36:56 - 06:06:56	-4894
CU-SBO	05:51:56	-61.9	Dark	Down	41.6	98.1	Up	05:36:56 - 06:06:56	-4897
Wildwood	05:52:45	-59.1	Dark	Down	31.3	85.5	Up	05:37:45 - 06:07:45	-4977
Laughlin/Bullhead City	05:52:34	-61.1	Dark	Down	34.7	88.4	Up	05:37:34 - 06:07:34	-5020
Patrick	05:52:32	-61.4	Dark	Down	35.2	88.9	Up	05:37:32 - 06:07:32	-5022
Idyllwild	05:52:43	-60.6	Dark	Down	32.9	86.3	Up	05:37:43 - 06:07:43	-5072
Lake Havasu City	05:52:35	-61.7	Dark	Down	34.9	88.1	Up	05:37:35 - 06:07:35	-5087
Calipatria	05:52:42	-61.8	Dark	Down	33.8	86.5	Up	05:37:42 - 06:07:42	-5167
Yuma	05:52:41	-62.6	Dark	Down	34.5	86.7	Up	05:37:41 - 06:07:41	-5237
George/Scottsdale	05:52:33	-63.7	Dark	Down	36.9	88.8	Up	05:37:33 - 06:07:33	-5239