RECON: TNO occultation with 523790

Event between (523790) 15HP9 and star GA0680:29970348 with event index number of 2606065

Geocentric closest approach at 2027/07/24 08:14:43 UTC

J2000 position of star is 18:37:22.9 -21:02:08
Equinox of date position of star is 18:38:50.6 -21:00:46
Stellar brightness G=15.5, 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 73% illuminated.
Apparent brightness V=23.1

[RECON map]
Object is 18.0 AU from the Sun and 17.0 AU from the Earth.
Apparent velocity is 20.3 km/sec on the sky relative to the star, or, 5.9 arcsec/hr.
The 1-sigma error in the time of the event is 356 seconds.
The 1-sigma cross-track error in the shadow position is 785 km.
The sky-plane scale is 12340.0 km/arcsec.

The object has an absolute magnitude Hv=10.5
Diameter=50.1 km assuming a 5% albedo -- 2.4 sec chord
Diameter=20.5 km assuming a 30% albedo -- 1.0 sec chord
Dynamical classification is CENTAURR

Star training set for 523790, (2027/07/24 08:15UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:06.1 -26:29:26  0.9 29.70 114
Nunki          18:56:58.3 -26:15:36  2.0  6.67  82
PPM 268697     18:40:32.0 -21:01:35  6.1  0.35  84
PPM 268656     18:38:38.2 -21:01:16  9.5  0.09  85
523790         18:39:01.7 -21:00:36 15.5        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 2.5 sigma about the mid-time.
The median site spacing is 22.0 km RECON observability=0.6 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 08:12:51 -19.4 Dark Up 14.9 204.4 Really Low 07:57:51 - 08:27:51 4434

Victoria 08:12:57 -21.6 Dark Up 17.6 201.8 Really Low 07:57:57 - 08:27:57 4393

Peachland 08:12:47 -20.4 Dark Up 15.6 205.1 Really Low 07:57:47 - 08:27:47 4385

Kelowna 08:12:47 -20.2 Dark Up 15.4 205.3 Really Low 07:57:47 - 08:27:47 4384

Summerland 08:12:47 -20.5 Dark Up 15.7 205.2 Really Low 07:57:47 - 08:27:47 4377

Penticton 08:12:46 -20.6 Dark Up 15.7 205.3 Really Low 07:57:46 - 08:27:46 4372

Oliver 08:12:46 -20.9 Dark Up 16.0 205.3 Really Low 07:57:46 - 08:27:46 4356

Anarchist Mountain Observatory 08:12:45 -21.1 Dark Up 16.1 205.5 Really Low 07:57:45 - 08:27:45 4346

Okanogan 08:12:45 -21.7 Dark Up 16.8 205.4 Really Low 07:57:45 - 08:27:45 4320

Brewster 08:12:45 -22.0 Dark Up 17.1 205.2 Really Low 07:57:45 - 08:27:45 4311

Manson/Chelan 08:12:46 -22.2 Dark Up 17.4 204.9 Really Low 07:57:46 - 08:27:46 4308

Wenatchee 08:12:46 -22.7 Dark Up 17.9 204.8 Really Low 07:57:46 - 08:27:46 4289

Ellensburg 08:12:46 -23.1 Dark Up 18.3 204.7 Really Low 07:57:46 - 08:27:46 4274

Yakima 08:12:45 -23.5 Dark Up 18.7 204.7 Really Low 07:57:45 - 08:27:45 4255

Toppenish/White Swan 08:12:45 -23.7 Dark Up 18.8 204.9 Really Low 07:57:45 - 08:27:45 4241

Sleaford 08:12:14 -16.8 AT Up 9.1 217.1 Really Low 07:57:14 - 08:27:14 4222

The Dalles 08:12:46 -24.5 Dark Up 19.7 204.3 Really Low 07:57:46 - 08:27:46 4217

PNWRO 08:12:39 -24.1 Dark Up 18.7 206.3 Really Low 07:57:39 - 08:27:39 4195

Maupin 08:12:45 -24.9 Dark Up 20.1 204.4 Low 07:57:45 - 08:27:45 4195

Sisters 08:12:45 -25.8 Dark Up 21.0 204.1 Low 07:57:45 - 08:27:45 4160

Bend 08:12:44 -26.1 Dark Up 21.2 204.4 Low 07:57:44 - 08:27:44 4143

Oregon Observatory 08:12:45 -26.2 Dark Up 21.4 204.3 Low 07:57:45 - 08:27:45 4136

Chiloquin 08:12:45 -27.5 Dark Up 22.7 204.1 Low 07:57:45 - 08:27:45 4074

Klamath Falls 08:12:44 -27.9 Dark Up 23.0 204.2 Low 07:57:44 - 08:27:44 4054

Cedarville 08:12:37 -28.6 Dark Up 23.1 205.9 Low 07:57:37 - 08:27:37 3984

Fall River/Burney 08:12:41 -29.1 Dark Up 24.0 204.8 Low 07:57:41 - 08:27:41 3980

Greenville 08:12:38 -30.0 Dark Up 24.6 205.4 Low 07:57:38 - 08:27:38 3919

Gimple 08:12:38 -30.0 Dark Up 24.6 205.5 Low 07:57:38 - 08:27:38 3917

Quincy 08:12:38 -30.2 Dark Up 24.8 205.4 Low 07:57:38 - 08:27:38 3907

Portola 08:12:36 -30.3 Dark Up 24.8 205.9 Low 07:57:36 - 08:27:36 3890

Reno 08:12:34 -30.6 Dark Up 24.8 206.6 Low 07:57:34 - 08:27:34 3861

Carson City 08:12:33 -30.9 Dark Up 25.1 206.7 Low 07:57:33 - 08:27:33 3839

Gardnerville 08:12:32 -31.2 Dark Up 25.3 206.8 Low 07:57:32 - 08:27:32 3823

Yerington 08:12:30 -31.1 Dark Up 25.1 207.3 Low 07:57:30 - 08:27:30 3814

Hawthorne 08:12:28 -31.5 Dark Up 25.3 207.9 Low 07:57:28 - 08:27:28 3774

Lee Vining 08:12:29 -32.1 Dark Up 26.0 207.6 Low 07:57:29 - 08:27:29 3750

Bishop 08:12:25 -32.7 Dark Up 26.2 208.4 Low 07:57:25 - 08:27:25 3696

Beatty 08:12:19 -33.0 Dark Up 26.0 210.0 Low 07:57:19 - 08:27:19 3630

Dunrhomin 08:11:45 -28.0 Dark Up 18.2 219.4 Really Low 07:56:45 - 08:26:45 3563

Nikitin 08:11:44 -28.2 Dark Up 18.3 219.4 Really Low 07:56:44 - 08:26:44 3551

CU-SBO 08:11:45 -28.3 Dark Up 18.4 219.4 Really Low 07:56:45 - 08:26:45 3549

Wildwood 08:12:23 -36.0 Dark Up 29.2 209.0 Low 07:57:23 - 08:27:23 3485

Laughlin/Bullhead City 08:12:09 -34.6 Dark Up 26.6 212.5 Low 07:57:09 - 08:27:09 3463

Patrick 08:12:06 -34.2 Dark Up 26.1 213.0 Low 07:57:06 - 08:27:06 3463

Idyllwild 08:12:15 -36.2 Dark Up 28.7 210.9 Low 07:57:15 - 08:27:15 3417

Lake Havasu City 08:12:07 -35.2 Dark Up 27.0 212.9 Low 07:57:07 - 08:27:07 3411

Calipatria 08:12:10 -36.7 Dark Up 28.7 212.2 Low 07:57:10 - 08:27:10 3345

George/Scottsdale 08:11:57 -35.6 Dark Up 26.6 215.3 Low 07:56:57 - 08:26:57 3296

Yuma 08:12:06 -37.0 Dark Up 28.7 213.1 Low 07:57:06 - 08:27:06 3293

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 523790, (2027/07/24 08:15UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 29.70 114
Nunki          18:55:15.9 -26:17:49  2.0  6.67  82
PPM 268697     18:38:53.3 -21:03:10  6.1  0.35  84
PPM 268656     18:36:59.5 -21:02:47  9.5  0.09  85
523790         18:37:22.9 -21:02:08 15.5        85
Positions are for J2000

Event circumstances last updated at 2024/06/22 21:27:28 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	08:12:51	-19.4	Dark	Up	14.9	204.4	Really Low	07:57:51 - 08:27:51	4434
Victoria	08:12:57	-21.6	Dark	Up	17.6	201.8	Really Low	07:57:57 - 08:27:57	4393
Peachland	08:12:47	-20.4	Dark	Up	15.6	205.1	Really Low	07:57:47 - 08:27:47	4385
Kelowna	08:12:47	-20.2	Dark	Up	15.4	205.3	Really Low	07:57:47 - 08:27:47	4384
Summerland	08:12:47	-20.5	Dark	Up	15.7	205.2	Really Low	07:57:47 - 08:27:47	4377
Penticton	08:12:46	-20.6	Dark	Up	15.7	205.3	Really Low	07:57:46 - 08:27:46	4372
Oliver	08:12:46	-20.9	Dark	Up	16.0	205.3	Really Low	07:57:46 - 08:27:46	4356
Anarchist Mountain Observatory	08:12:45	-21.1	Dark	Up	16.1	205.5	Really Low	07:57:45 - 08:27:45	4346
Okanogan	08:12:45	-21.7	Dark	Up	16.8	205.4	Really Low	07:57:45 - 08:27:45	4320
Brewster	08:12:45	-22.0	Dark	Up	17.1	205.2	Really Low	07:57:45 - 08:27:45	4311
Manson/Chelan	08:12:46	-22.2	Dark	Up	17.4	204.9	Really Low	07:57:46 - 08:27:46	4308
Wenatchee	08:12:46	-22.7	Dark	Up	17.9	204.8	Really Low	07:57:46 - 08:27:46	4289
Ellensburg	08:12:46	-23.1	Dark	Up	18.3	204.7	Really Low	07:57:46 - 08:27:46	4274
Yakima	08:12:45	-23.5	Dark	Up	18.7	204.7	Really Low	07:57:45 - 08:27:45	4255
Toppenish/White Swan	08:12:45	-23.7	Dark	Up	18.8	204.9	Really Low	07:57:45 - 08:27:45	4241
Sleaford	08:12:14	-16.8	AT	Up	9.1	217.1	Really Low	07:57:14 - 08:27:14	4222
The Dalles	08:12:46	-24.5	Dark	Up	19.7	204.3	Really Low	07:57:46 - 08:27:46	4217
PNWRO	08:12:39	-24.1	Dark	Up	18.7	206.3	Really Low	07:57:39 - 08:27:39	4195
Maupin	08:12:45	-24.9	Dark	Up	20.1	204.4	Low	07:57:45 - 08:27:45	4195
Sisters	08:12:45	-25.8	Dark	Up	21.0	204.1	Low	07:57:45 - 08:27:45	4160
Bend	08:12:44	-26.1	Dark	Up	21.2	204.4	Low	07:57:44 - 08:27:44	4143
Oregon Observatory	08:12:45	-26.2	Dark	Up	21.4	204.3	Low	07:57:45 - 08:27:45	4136
Chiloquin	08:12:45	-27.5	Dark	Up	22.7	204.1	Low	07:57:45 - 08:27:45	4074
Klamath Falls	08:12:44	-27.9	Dark	Up	23.0	204.2	Low	07:57:44 - 08:27:44	4054
Cedarville	08:12:37	-28.6	Dark	Up	23.1	205.9	Low	07:57:37 - 08:27:37	3984
Fall River/Burney	08:12:41	-29.1	Dark	Up	24.0	204.8	Low	07:57:41 - 08:27:41	3980
Greenville	08:12:38	-30.0	Dark	Up	24.6	205.4	Low	07:57:38 - 08:27:38	3919
Gimple	08:12:38	-30.0	Dark	Up	24.6	205.5	Low	07:57:38 - 08:27:38	3917
Quincy	08:12:38	-30.2	Dark	Up	24.8	205.4	Low	07:57:38 - 08:27:38	3907
Portola	08:12:36	-30.3	Dark	Up	24.8	205.9	Low	07:57:36 - 08:27:36	3890
Reno	08:12:34	-30.6	Dark	Up	24.8	206.6	Low	07:57:34 - 08:27:34	3861
Carson City	08:12:33	-30.9	Dark	Up	25.1	206.7	Low	07:57:33 - 08:27:33	3839
Gardnerville	08:12:32	-31.2	Dark	Up	25.3	206.8	Low	07:57:32 - 08:27:32	3823
Yerington	08:12:30	-31.1	Dark	Up	25.1	207.3	Low	07:57:30 - 08:27:30	3814
Hawthorne	08:12:28	-31.5	Dark	Up	25.3	207.9	Low	07:57:28 - 08:27:28	3774
Lee Vining	08:12:29	-32.1	Dark	Up	26.0	207.6	Low	07:57:29 - 08:27:29	3750
Bishop	08:12:25	-32.7	Dark	Up	26.2	208.4	Low	07:57:25 - 08:27:25	3696
Beatty	08:12:19	-33.0	Dark	Up	26.0	210.0	Low	07:57:19 - 08:27:19	3630
Dunrhomin	08:11:45	-28.0	Dark	Up	18.2	219.4	Really Low	07:56:45 - 08:26:45	3563
Nikitin	08:11:44	-28.2	Dark	Up	18.3	219.4	Really Low	07:56:44 - 08:26:44	3551
CU-SBO	08:11:45	-28.3	Dark	Up	18.4	219.4	Really Low	07:56:45 - 08:26:45	3549
Wildwood	08:12:23	-36.0	Dark	Up	29.2	209.0	Low	07:57:23 - 08:27:23	3485
Laughlin/Bullhead City	08:12:09	-34.6	Dark	Up	26.6	212.5	Low	07:57:09 - 08:27:09	3463
Patrick	08:12:06	-34.2	Dark	Up	26.1	213.0	Low	07:57:06 - 08:27:06	3463
Idyllwild	08:12:15	-36.2	Dark	Up	28.7	210.9	Low	07:57:15 - 08:27:15	3417
Lake Havasu City	08:12:07	-35.2	Dark	Up	27.0	212.9	Low	07:57:07 - 08:27:07	3411
Calipatria	08:12:10	-36.7	Dark	Up	28.7	212.2	Low	07:57:10 - 08:27:10	3345
George/Scottsdale	08:11:57	-35.6	Dark	Up	26.6	215.3	Low	07:56:57 - 08:26:57	3296
Yuma	08:12:06	-37.0	Dark	Up	28.7	213.1	Low	07:57:06 - 08:27:06	3293