RECON: TNO occultation with 523681

Event between (523681) 14BV64 and star GA0820:04002009 with event index number of 2624648

Geocentric closest approach at 2027/03/16 05:29:33 UTC

J2000 position of star is 10:32:09.8 -06:00:24
Equinox of date position of star is 10:33:23.3 -06:07:56
Stellar brightness G=16.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 71 degrees from the moon. Moon is 56% illuminated.
Apparent brightness V=21.4

[RECON map]
Object is 46.4 AU from the Sun and 45.4 AU from the Earth.
Apparent velocity is 25.0 km/sec on the sky relative to the star, or, 2.7 arcsec/hr.
The 1-sigma error in the time of the event is 92 seconds.
The 1-sigma cross-track error in the shadow position is 1984 km.
The sky-plane scale is 32947.9 km/arcsec.

The object has an absolute magnitude Hv=4.7
Diameter=682.4 km assuming a 5% albedo -- 27.4 sec chord
Diameter=278.6 km assuming a 30% albedo -- 11.2 sec chord
Dynamical classification is SCATEXTD

Star training set for 523681, (2027/03/16 05:28UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:49.2 +11:49:59  1.3 18.92  57
Alphard        09:28:55.5 -08:46:40  2.0 16.23  60
PPM 193503     10:32:20.5 -07:46:40  6.2  1.66  72
PPM 193522     10:33:50.7 -06:12:58  7.1  0.10  71
523681         10:33:32.0 -06:08:50 16.9        72
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 13.5 km RECON observability=1.0 and success probability=0.5%

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

Sleaford 05:31:23 -35.5 Dark Up 31.6 171.2 Up 05:23:13 - 05:39:32 5770

Kamloops 05:31:55 -30.9 Dark Up 30.3 154.6 Up 05:23:46 - 05:40:05 5254

Kelowna 05:31:53 -31.8 Dark Up 31.2 155.4 Up 05:23:43 - 05:40:02 5224

Peachland 05:31:54 -31.8 Dark Up 31.3 155.1 Up 05:23:45 - 05:40:04 5207

Summerland 05:31:53 -31.9 Dark Up 31.4 155.1 Up 05:23:44 - 05:40:03 5199

Penticton 05:31:53 -32.0 Dark Up 31.5 155.2 Up 05:23:43 - 05:40:02 5198

Oliver 05:31:53 -32.2 Dark Up 31.8 155.1 Up 05:23:44 - 05:40:03 5173

Anarchist Mountain Observatory 05:31:53 -32.4 Dark Up 32.0 155.3 Up 05:23:43 - 05:40:02 5167

Okanogan 05:31:53 -32.8 Dark Up 32.6 154.9 Up 05:23:44 - 05:40:03 5114

Brewster 05:31:54 -32.9 Dark Up 32.8 154.6 Up 05:23:44 - 05:40:03 5088

Manson/Chelan 05:31:55 -32.8 Dark Up 32.8 154.1 Up 05:23:46 - 05:40:05 5061

Wenatchee 05:31:55 -33.0 Dark Up 33.2 153.8 Up 05:23:46 - 05:40:05 5021

Dunrhomin 05:31:10 -45.6 Dark Up 43.3 170.7 Up 05:23:01 - 05:39:20 5013

Victoria 05:32:03 -30.7 Dark Up 31.3 150.7 Up 05:23:54 - 05:40:13 5007

Nikitin 05:31:10 -45.7 Dark Up 43.5 170.6 Up 05:23:01 - 05:39:20 4998

CU-SBO 05:31:10 -45.7 Dark Up 43.5 170.5 Up 05:23:01 - 05:39:20 4991

Ellensburg 05:31:55 -33.2 Dark Up 33.5 153.4 Up 05:23:46 - 05:40:05 4984

PNWRO 05:31:51 -34.7 Dark Up 34.9 155.0 Up 05:23:42 - 05:40:01 4964

Yakima 05:31:55 -33.4 Dark Up 33.9 153.3 Up 05:23:46 - 05:40:05 4953

Toppenish/White Swan 05:31:55 -33.7 Dark Up 34.1 153.4 Up 05:23:46 - 05:40:05 4942

The Dalles 05:31:57 -33.7 Dark Up 34.6 152.3 Up 05:23:47 - 05:40:06 4858

Maupin 05:31:57 -34.1 Dark Up 35.0 152.3 Up 05:23:48 - 05:40:07 4829

Sisters 05:31:58 -34.3 Dark Up 35.6 151.4 Up 05:23:49 - 05:40:08 4745

Bend 05:31:57 -34.6 Dark Up 35.9 151.6 Up 05:23:48 - 05:40:07 4736

Oregon Observatory 05:31:58 -34.7 Dark Up 36.0 151.4 Up 05:23:48 - 05:40:07 4718

Chiloquin 05:31:59 -35.2 Dark Up 37.0 150.5 Up 05:23:49 - 05:40:08 4600

Cedarville 05:31:54 -36.8 Dark Up 38.5 152.0 Up 05:23:45 - 05:40:04 4575

Klamath Falls 05:31:58 -35.5 Dark Up 37.3 150.4 Up 05:23:49 - 05:40:08 4575

Fall River/Burney 05:31:57 -36.4 Dark Up 38.5 150.4 Up 05:23:48 - 05:40:07 4493

Gimple 05:31:55 -37.2 Dark Up 39.5 150.7 Up 05:23:46 - 05:40:05 4438

Greenville 05:31:57 -37.2 Dark Up 39.4 150.6 Up 05:23:47 - 05:40:06 4435

Reno 05:31:53 -38.2 Dark Up 40.4 151.7 Up 05:23:43 - 05:40:02 4427

Portola 05:31:55 -37.7 Dark Up 39.9 151.0 Up 05:23:45 - 05:40:04 4426

Quincy 05:31:56 -37.3 Dark Up 39.6 150.5 Up 05:23:46 - 05:40:05 4419

Yerington 05:31:50 -39.0 Dark Up 41.1 152.3 Up 05:23:41 - 05:40:00 4406

Carson City 05:31:52 -38.5 Dark Up 40.7 151.6 Up 05:23:43 - 05:40:02 4399

Hawthorne 05:31:48 -39.6 Dark Up 41.7 152.7 Up 05:23:39 - 05:39:58 4387

Gardnerville 05:31:52 -38.6 Dark Up 40.9 151.5 Up 05:23:42 - 05:40:01 4380

Lee Vining 05:31:50 -39.6 Dark Up 42.0 151.9 Up 05:23:40 - 05:39:59 4322

Beatty 05:31:43 -41.7 Dark Up 43.8 154.4 Up 05:23:33 - 05:39:52 4322

Patrick 05:31:33 -44.5 Dark Up 46.1 157.6 Up 05:23:23 - 05:39:42 4308

Bishop 05:31:47 -40.4 Dark Up 42.8 152.5 Up 05:23:38 - 05:39:57 4299

Laughlin/Bullhead City 05:31:35 -44.2 Dark Up 46.1 156.5 Up 05:23:25 - 05:39:44 4260

George/Scottsdale 05:31:25 -46.8 Dark Up 48.3 159.7 Up 05:23:15 - 05:39:34 4245

Lake Havasu City 05:31:31 -44.7 Dark Up 46.8 156.6 Up 05:23:22 - 05:39:41 4214

Idyllwild 05:31:40 -43.7 Dark Up 46.7 153.0 Up 05:23:31 - 05:39:50 4056

Calipatria 05:31:36 -44.8 Dark Up 47.6 154.3 Up 05:23:27 - 05:39:46 4050

Yuma 05:31:33 -45.7 Dark Up 48.4 155.3 Up 05:23:24 - 05:39:43 4048

Wildwood 05:31:47 -42.2 Dark Up 45.6 150.7 Up 05:23:37 - 05:39:56 4013

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 523681, (2027/03/16 05:28UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3 18.92  57
Alphard        09:27:35.2 -08:39:30  2.0 16.23  60
PPM 193503     10:30:58.7 -07:38:15  6.2  1.66  72
PPM 193522     10:32:28.5 -06:04:31  7.1  0.10  71
523681         10:32:09.8 -06:00:24 16.9        71
Positions are for J2000

Event circumstances last updated at 2024/04/23 03:26:43 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)
Sleaford	05:31:23	-35.5	Dark	Up	31.6	171.2	Up	05:23:13 - 05:39:32	5770
Kamloops	05:31:55	-30.9	Dark	Up	30.3	154.6	Up	05:23:46 - 05:40:05	5254
Kelowna	05:31:53	-31.8	Dark	Up	31.2	155.4	Up	05:23:43 - 05:40:02	5224
Peachland	05:31:54	-31.8	Dark	Up	31.3	155.1	Up	05:23:45 - 05:40:04	5207
Summerland	05:31:53	-31.9	Dark	Up	31.4	155.1	Up	05:23:44 - 05:40:03	5199
Penticton	05:31:53	-32.0	Dark	Up	31.5	155.2	Up	05:23:43 - 05:40:02	5198
Oliver	05:31:53	-32.2	Dark	Up	31.8	155.1	Up	05:23:44 - 05:40:03	5173
Anarchist Mountain Observatory	05:31:53	-32.4	Dark	Up	32.0	155.3	Up	05:23:43 - 05:40:02	5167
Okanogan	05:31:53	-32.8	Dark	Up	32.6	154.9	Up	05:23:44 - 05:40:03	5114
Brewster	05:31:54	-32.9	Dark	Up	32.8	154.6	Up	05:23:44 - 05:40:03	5088
Manson/Chelan	05:31:55	-32.8	Dark	Up	32.8	154.1	Up	05:23:46 - 05:40:05	5061
Wenatchee	05:31:55	-33.0	Dark	Up	33.2	153.8	Up	05:23:46 - 05:40:05	5021
Dunrhomin	05:31:10	-45.6	Dark	Up	43.3	170.7	Up	05:23:01 - 05:39:20	5013
Victoria	05:32:03	-30.7	Dark	Up	31.3	150.7	Up	05:23:54 - 05:40:13	5007
Nikitin	05:31:10	-45.7	Dark	Up	43.5	170.6	Up	05:23:01 - 05:39:20	4998
CU-SBO	05:31:10	-45.7	Dark	Up	43.5	170.5	Up	05:23:01 - 05:39:20	4991
Ellensburg	05:31:55	-33.2	Dark	Up	33.5	153.4	Up	05:23:46 - 05:40:05	4984
PNWRO	05:31:51	-34.7	Dark	Up	34.9	155.0	Up	05:23:42 - 05:40:01	4964
Yakima	05:31:55	-33.4	Dark	Up	33.9	153.3	Up	05:23:46 - 05:40:05	4953
Toppenish/White Swan	05:31:55	-33.7	Dark	Up	34.1	153.4	Up	05:23:46 - 05:40:05	4942
The Dalles	05:31:57	-33.7	Dark	Up	34.6	152.3	Up	05:23:47 - 05:40:06	4858
Maupin	05:31:57	-34.1	Dark	Up	35.0	152.3	Up	05:23:48 - 05:40:07	4829
Sisters	05:31:58	-34.3	Dark	Up	35.6	151.4	Up	05:23:49 - 05:40:08	4745
Bend	05:31:57	-34.6	Dark	Up	35.9	151.6	Up	05:23:48 - 05:40:07	4736
Oregon Observatory	05:31:58	-34.7	Dark	Up	36.0	151.4	Up	05:23:48 - 05:40:07	4718
Chiloquin	05:31:59	-35.2	Dark	Up	37.0	150.5	Up	05:23:49 - 05:40:08	4600
Cedarville	05:31:54	-36.8	Dark	Up	38.5	152.0	Up	05:23:45 - 05:40:04	4575
Klamath Falls	05:31:58	-35.5	Dark	Up	37.3	150.4	Up	05:23:49 - 05:40:08	4575
Fall River/Burney	05:31:57	-36.4	Dark	Up	38.5	150.4	Up	05:23:48 - 05:40:07	4493
Gimple	05:31:55	-37.2	Dark	Up	39.5	150.7	Up	05:23:46 - 05:40:05	4438
Greenville	05:31:57	-37.2	Dark	Up	39.4	150.6	Up	05:23:47 - 05:40:06	4435
Reno	05:31:53	-38.2	Dark	Up	40.4	151.7	Up	05:23:43 - 05:40:02	4427
Portola	05:31:55	-37.7	Dark	Up	39.9	151.0	Up	05:23:45 - 05:40:04	4426
Quincy	05:31:56	-37.3	Dark	Up	39.6	150.5	Up	05:23:46 - 05:40:05	4419
Yerington	05:31:50	-39.0	Dark	Up	41.1	152.3	Up	05:23:41 - 05:40:00	4406
Carson City	05:31:52	-38.5	Dark	Up	40.7	151.6	Up	05:23:43 - 05:40:02	4399
Hawthorne	05:31:48	-39.6	Dark	Up	41.7	152.7	Up	05:23:39 - 05:39:58	4387
Gardnerville	05:31:52	-38.6	Dark	Up	40.9	151.5	Up	05:23:42 - 05:40:01	4380
Lee Vining	05:31:50	-39.6	Dark	Up	42.0	151.9	Up	05:23:40 - 05:39:59	4322
Beatty	05:31:43	-41.7	Dark	Up	43.8	154.4	Up	05:23:33 - 05:39:52	4322
Patrick	05:31:33	-44.5	Dark	Up	46.1	157.6	Up	05:23:23 - 05:39:42	4308
Bishop	05:31:47	-40.4	Dark	Up	42.8	152.5	Up	05:23:38 - 05:39:57	4299
Laughlin/Bullhead City	05:31:35	-44.2	Dark	Up	46.1	156.5	Up	05:23:25 - 05:39:44	4260
George/Scottsdale	05:31:25	-46.8	Dark	Up	48.3	159.7	Up	05:23:15 - 05:39:34	4245
Lake Havasu City	05:31:31	-44.7	Dark	Up	46.8	156.6	Up	05:23:22 - 05:39:41	4214
Idyllwild	05:31:40	-43.7	Dark	Up	46.7	153.0	Up	05:23:31 - 05:39:50	4056
Calipatria	05:31:36	-44.8	Dark	Up	47.6	154.3	Up	05:23:27 - 05:39:46	4050
Yuma	05:31:33	-45.7	Dark	Up	48.4	155.3	Up	05:23:24 - 05:39:43	4048
Wildwood	05:31:47	-42.2	Dark	Up	45.6	150.7	Up	05:23:37 - 05:39:56	4013