RECON: TNO occultation with 523790

Event between (523790) 15HP9 and star GA0680:31087843 with event index number of 2605996

Geocentric closest approach at 2027/06/28 06:11:34 UTC

J2000 position of star is 18:42:07.9 -20:56:10
Equinox of date position of star is 18:43:35.5 -20:54:39
Stellar brightness G=16.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 99 degrees from the moon. Moon is 39% illuminated.
Apparent brightness V=22.9

[RECON map]
Object is 17.9 AU from the Sun and 16.9 AU from the Earth.
Apparent velocity is 22.4 km/sec on the sky relative to the star, or, 6.6 arcsec/hr.
The 1-sigma error in the time of the event is 329 seconds.
The 1-sigma cross-track error in the shadow position is 654 km.
The sky-plane scale is 12268.8 km/arcsec.

The object has an absolute magnitude Hv=10.5
Diameter=50.1 km assuming a 5% albedo -- 2.2 sec chord
Diameter=20.5 km assuming a 30% albedo -- 0.9 sec chord
Dynamical classification is CENTAURR

Star training set for 523790, (2027/06/28 06:12UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:05.9 -26:29:26  0.9 30.79 129
Nunki          18:56:58.1 -26:15:36  2.0  6.15  97
PPM 268697     18:40:31.8 -21:01:35  6.1  0.77  99
PPM 268806     18:45:11.1 -20:53:22  7.5  0.33  98
PPM 268780     18:44:11.3 -21:08:15  9.3  0.25  99
523790         18:43:46.2 -20:54:28 16.4        98
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 2.7 sigma about the mid-time.
The median site spacing is 19.6 km RECON observability=0.5 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)

Sleaford 06:12:04 -13.7 AT Down 15.4 163.2 Really Low 05:57:04 - 06:27:04 3267

Kamloops 06:12:43 -12.0 AT Down 13.2 149.8 Really Low 05:57:43 - 06:27:43 3149

Kelowna 06:12:43 -13.0 AT Down 14.2 150.5 Really Low 05:57:43 - 06:27:43 3126

Peachland 06:12:43 -13.0 AT Down 14.2 150.3 Really Low 05:57:43 - 06:27:43 3120

Summerland 06:12:43 -13.2 AT Down 14.3 150.3 Really Low 05:57:43 - 06:27:43 3115

Penticton 06:12:43 -13.3 AT Down 14.4 150.4 Really Low 05:57:43 - 06:27:43 3113

Oliver 06:12:43 -13.6 AT Down 14.7 150.4 Really Low 05:57:43 - 06:27:43 3100

Anarchist Mountain Observatory 06:12:43 -13.8 AT Down 14.9 150.5 Really Low 05:57:43 - 06:27:43 3096

Okanogan 06:12:43 -14.3 AT Down 15.4 150.2 Really Low 05:57:43 - 06:27:43 3070

Brewster 06:12:43 -14.5 AT Down 15.6 150.0 Really Low 05:57:43 - 06:27:43 3059

Manson/Chelan 06:12:43 -14.6 AT Down 15.6 149.7 Really Low 05:57:43 - 06:27:43 3049

Victoria 06:13:00 -13.0 AT Down 14.0 146.9 Really Low 05:58:00 - 06:28:00 3038

Wenatchee 06:12:43 -15.0 AT Down 16.0 149.4 Really Low 05:57:43 - 06:27:43 3031

Ellensburg 06:12:43 -15.3 AT Down 16.3 149.2 Really Low 05:57:43 - 06:27:43 3015

Yakima 06:12:43 -15.6 AT Down 16.6 149.1 Really Low 05:57:43 - 06:27:43 2999

Toppenish/White Swan 06:12:43 -15.9 AT Down 16.9 149.2 Really Low 05:57:43 - 06:27:43 2991

PNWRO 06:12:43 -16.7 AT Down 17.7 150.5 Really Low 05:57:43 - 06:27:43 2981

The Dalles 06:13:00 -16.3 AT Down 17.3 148.4 Really Low 05:58:00 - 06:28:00 2935

Maupin 06:13:00 -16.7 AT Down 17.7 148.5 Really Low 05:58:00 - 06:28:00 2917

Sisters 06:13:04 -17.4 AT Down 18.2 147.9 Really Low 05:58:04 - 06:28:04 2872

Bend 06:13:03 -17.7 AT Down 18.5 148.1 Really Low 05:58:03 - 06:28:03 2863

Oregon Observatory 06:13:04 -17.8 AT Down 18.6 147.9 Really Low 05:58:04 - 06:28:04 2854

Chiloquin 06:13:08 -18.8 Dark Down 19.6 147.3 Really Low 05:58:08 - 06:28:08 2785

Klamath Falls 06:13:08 -19.1 Dark Down 19.9 147.3 Really Low 05:58:08 - 06:28:08 2769

Dunrhomin 06:12:16 -25.3 Dark Down 26.9 162.7 Low 05:57:16 - 06:27:16 2769

Nikitin 06:12:16 -25.5 Dark Down 27.1 162.6 Low 05:57:16 - 06:27:16 2759

CU-SBO 06:12:16 -25.6 Dark Down 27.1 162.5 Low 05:57:16 - 06:27:16 2755

Cedarville 06:13:05 -20.3 Dark Down 21.1 148.6 Low 05:58:05 - 06:28:05 2749

Fall River/Burney 06:13:09 -20.3 Dark Down 21.1 147.5 Low 05:58:09 - 06:28:09 2711

Gimple 06:13:09 -21.3 Dark Down 22.0 147.7 Low 05:58:09 - 06:28:09 2668

Greenville 06:13:10 -21.3 Dark Down 22.0 147.7 Low 05:58:10 - 06:28:10 2667

Quincy 06:13:10 -21.4 Dark Down 22.2 147.6 Low 05:58:10 - 06:28:10 2656

Portola 06:13:09 -21.7 Dark Down 22.5 148.0 Low 05:58:09 - 06:28:09 2655

Reno 06:13:08 -22.2 Dark Down 23.0 148.6 Low 05:58:08 - 06:28:08 2646

Carson City 06:13:08 -22.5 Dark Down 23.3 148.5 Low 05:58:08 - 06:28:08 2627

Yerington 06:13:06 -22.9 Dark Down 23.7 149.0 Low 05:58:06 - 06:28:06 2622

Gardnerville 06:13:08 -22.7 Dark Down 23.5 148.5 Low 05:58:08 - 06:28:08 2614

Hawthorne 06:13:05 -23.5 Dark Down 24.3 149.4 Low 05:58:05 - 06:28:05 2600

Lee Vining 06:13:08 -23.8 Dark Down 24.6 148.8 Low 05:58:08 - 06:28:08 2564

Bishop 06:13:07 -24.6 Dark Down 25.4 149.4 Low 05:58:07 - 06:28:07 2536

Beatty 06:13:01 -25.6 Dark Down 26.5 150.8 Low 05:58:01 - 06:28:01 2523

Patrick 06:12:43 -27.9 Dark Down 28.8 153.1 Low 05:57:43 - 06:27:43 2467

Laughlin/Bullhead City 06:12:56 -27.9 Dark Down 28.8 152.4 Low 05:57:56 - 06:27:56 2434

Lake Havasu City 06:12:56 -28.6 Dark Down 29.5 152.5 Low 05:57:56 - 06:27:56 2394

George/Scottsdale 06:12:43 -30.1 Dark Down 31.1 154.7 Up 05:57:43 - 06:27:43 2365

Wildwood 06:13:12 -27.5 Dark Down 28.1 148.3 Low 05:58:12 - 06:28:12 2333

Idyllwild 06:13:07 -28.5 Dark Down 29.2 150.0 Low 05:58:07 - 06:28:07 2329

Calipatria 06:13:03 -29.5 Dark Down 30.2 151.0 Up 05:58:03 - 06:28:03 2298

Yuma 06:13:00 -30.2 Dark Down 31.0 151.7 Up 05:58:00 - 06:28:00 2277

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, (2027/06/28 06:12UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 30.79 129
Nunki          18:55:15.9 -26:17:49  2.0  6.15  97
PPM 268697     18:38:53.3 -21:03:10  6.1  0.77  99
PPM 268806     18:43:32.8 -20:55:08  7.5  0.33  98
PPM 268780     18:42:32.9 -21:09:58  9.3  0.25  99
523790         18:42:07.9 -20:56:10 16.4        99
Positions are for J2000

Event circumstances last updated at 2024/06/21 21:29:27 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)
Sleaford	06:12:04	-13.7	AT	Down	15.4	163.2	Really Low	05:57:04 - 06:27:04	3267
Kamloops	06:12:43	-12.0	AT	Down	13.2	149.8	Really Low	05:57:43 - 06:27:43	3149
Kelowna	06:12:43	-13.0	AT	Down	14.2	150.5	Really Low	05:57:43 - 06:27:43	3126
Peachland	06:12:43	-13.0	AT	Down	14.2	150.3	Really Low	05:57:43 - 06:27:43	3120
Summerland	06:12:43	-13.2	AT	Down	14.3	150.3	Really Low	05:57:43 - 06:27:43	3115
Penticton	06:12:43	-13.3	AT	Down	14.4	150.4	Really Low	05:57:43 - 06:27:43	3113
Oliver	06:12:43	-13.6	AT	Down	14.7	150.4	Really Low	05:57:43 - 06:27:43	3100
Anarchist Mountain Observatory	06:12:43	-13.8	AT	Down	14.9	150.5	Really Low	05:57:43 - 06:27:43	3096
Okanogan	06:12:43	-14.3	AT	Down	15.4	150.2	Really Low	05:57:43 - 06:27:43	3070
Brewster	06:12:43	-14.5	AT	Down	15.6	150.0	Really Low	05:57:43 - 06:27:43	3059
Manson/Chelan	06:12:43	-14.6	AT	Down	15.6	149.7	Really Low	05:57:43 - 06:27:43	3049
Victoria	06:13:00	-13.0	AT	Down	14.0	146.9	Really Low	05:58:00 - 06:28:00	3038
Wenatchee	06:12:43	-15.0	AT	Down	16.0	149.4	Really Low	05:57:43 - 06:27:43	3031
Ellensburg	06:12:43	-15.3	AT	Down	16.3	149.2	Really Low	05:57:43 - 06:27:43	3015
Yakima	06:12:43	-15.6	AT	Down	16.6	149.1	Really Low	05:57:43 - 06:27:43	2999
Toppenish/White Swan	06:12:43	-15.9	AT	Down	16.9	149.2	Really Low	05:57:43 - 06:27:43	2991
PNWRO	06:12:43	-16.7	AT	Down	17.7	150.5	Really Low	05:57:43 - 06:27:43	2981
The Dalles	06:13:00	-16.3	AT	Down	17.3	148.4	Really Low	05:58:00 - 06:28:00	2935
Maupin	06:13:00	-16.7	AT	Down	17.7	148.5	Really Low	05:58:00 - 06:28:00	2917
Sisters	06:13:04	-17.4	AT	Down	18.2	147.9	Really Low	05:58:04 - 06:28:04	2872
Bend	06:13:03	-17.7	AT	Down	18.5	148.1	Really Low	05:58:03 - 06:28:03	2863
Oregon Observatory	06:13:04	-17.8	AT	Down	18.6	147.9	Really Low	05:58:04 - 06:28:04	2854
Chiloquin	06:13:08	-18.8	Dark	Down	19.6	147.3	Really Low	05:58:08 - 06:28:08	2785
Klamath Falls	06:13:08	-19.1	Dark	Down	19.9	147.3	Really Low	05:58:08 - 06:28:08	2769
Dunrhomin	06:12:16	-25.3	Dark	Down	26.9	162.7	Low	05:57:16 - 06:27:16	2769
Nikitin	06:12:16	-25.5	Dark	Down	27.1	162.6	Low	05:57:16 - 06:27:16	2759
CU-SBO	06:12:16	-25.6	Dark	Down	27.1	162.5	Low	05:57:16 - 06:27:16	2755
Cedarville	06:13:05	-20.3	Dark	Down	21.1	148.6	Low	05:58:05 - 06:28:05	2749
Fall River/Burney	06:13:09	-20.3	Dark	Down	21.1	147.5	Low	05:58:09 - 06:28:09	2711
Gimple	06:13:09	-21.3	Dark	Down	22.0	147.7	Low	05:58:09 - 06:28:09	2668
Greenville	06:13:10	-21.3	Dark	Down	22.0	147.7	Low	05:58:10 - 06:28:10	2667
Quincy	06:13:10	-21.4	Dark	Down	22.2	147.6	Low	05:58:10 - 06:28:10	2656
Portola	06:13:09	-21.7	Dark	Down	22.5	148.0	Low	05:58:09 - 06:28:09	2655
Reno	06:13:08	-22.2	Dark	Down	23.0	148.6	Low	05:58:08 - 06:28:08	2646
Carson City	06:13:08	-22.5	Dark	Down	23.3	148.5	Low	05:58:08 - 06:28:08	2627
Yerington	06:13:06	-22.9	Dark	Down	23.7	149.0	Low	05:58:06 - 06:28:06	2622
Gardnerville	06:13:08	-22.7	Dark	Down	23.5	148.5	Low	05:58:08 - 06:28:08	2614
Hawthorne	06:13:05	-23.5	Dark	Down	24.3	149.4	Low	05:58:05 - 06:28:05	2600
Lee Vining	06:13:08	-23.8	Dark	Down	24.6	148.8	Low	05:58:08 - 06:28:08	2564
Bishop	06:13:07	-24.6	Dark	Down	25.4	149.4	Low	05:58:07 - 06:28:07	2536
Beatty	06:13:01	-25.6	Dark	Down	26.5	150.8	Low	05:58:01 - 06:28:01	2523
Patrick	06:12:43	-27.9	Dark	Down	28.8	153.1	Low	05:57:43 - 06:27:43	2467
Laughlin/Bullhead City	06:12:56	-27.9	Dark	Down	28.8	152.4	Low	05:57:56 - 06:27:56	2434
Lake Havasu City	06:12:56	-28.6	Dark	Down	29.5	152.5	Low	05:57:56 - 06:27:56	2394
George/Scottsdale	06:12:43	-30.1	Dark	Down	31.1	154.7	Up	05:57:43 - 06:27:43	2365
Wildwood	06:13:12	-27.5	Dark	Down	28.1	148.3	Low	05:58:12 - 06:28:12	2333
Idyllwild	06:13:07	-28.5	Dark	Down	29.2	150.0	Low	05:58:07 - 06:28:07	2329
Calipatria	06:13:03	-29.5	Dark	Down	30.2	151.0	Up	05:58:03 - 06:28:03	2298
Yuma	06:13:00	-30.2	Dark	Down	31.0	151.7	Up	05:58:00 - 06:28:00	2277