RECON: TNO occultation with 523697

Event between (523697) 14GY53 and star GA0840:04821462 with event index number of 2621369

Geocentric closest approach at 2027/05/19 05:18:07 UTC

J2000 position of star is 16:03:55.7 -04:08:05
Equinox of date position of star is 16:05:13.0 -04:12:01
Stellar brightness G=15.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 27 degrees from the moon. Moon is 98% illuminated.
Apparent brightness V=22.1

[RECON map]
Object is 34.2 AU from the Sun and 33.2 AU from the Earth.
Apparent velocity is 24.2 km/sec on the sky relative to the star, or, 3.6 arcsec/hr.
The 1-sigma error in the time of the event is 79 seconds.
The 1-sigma cross-track error in the shadow position is 1294 km.
The sky-plane scale is 24107.9 km/arcsec.

The object has an absolute magnitude Hv=6.8
Diameter=261.8 km assuming a 5% albedo -- 11.1 sec chord
Diameter=106.9 km assuming a 30% albedo -- 4.5 sec chord
Dynamical classification is 3:2E

Star training set for 523697, (2027/05/19 05:18UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:05.4 -26:29:25  0.9 23.12  26
1Del Oph       16:15:47.0 -03:45:45  2.7  2.63  29
PPM 199363     16:11:16.7 -03:32:13  5.0  1.62  28
PPM 199221     16:04:08.7 -03:43:58  7.9  0.57  27
PPM 199243     16:05:12.4 -04:16:32  9.8  0.08  27
523697         16:05:22.2 -04:12:29 15.4        27
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 31.9 km RECON observability=0.7 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 05:20:11 -15.0 AT Up 28.2 145.3 Low 05:13:08 - 05:27:15 6394

Kamloops 05:20:45 -11.6 NT Up 23.3 130.4 Low 05:13:41 - 05:27:48 6088

Kelowna 05:20:45 -12.6 AT Up 24.2 131.0 Low 05:13:41 - 05:27:48 6037

Peachland 05:20:45 -12.5 AT Up 24.2 130.7 Low 05:13:42 - 05:27:49 6025

Summerland 05:20:45 -12.7 AT Up 24.3 130.8 Low 05:13:42 - 05:27:49 6014

Penticton 05:20:45 -12.8 AT Up 24.4 130.8 Low 05:13:42 - 05:27:49 6011

Oliver 05:20:45 -13.1 AT Up 24.6 130.7 Low 05:13:42 - 05:27:49 5983

Anarchist Mountain Observatory 05:20:46 -13.3 AT Up 24.8 130.8 Low 05:13:42 - 05:27:49 5973

Okanogan 05:20:47 -13.7 AT Up 25.2 130.4 Low 05:13:44 - 05:27:51 5918

Brewster 05:20:48 -13.9 AT Up 25.2 130.1 Low 05:13:45 - 05:27:52 5894

Victoria 05:20:55 -12.0 AT Up 23.1 126.9 Low 05:13:51 - 05:27:58 5877

Manson/Chelan 05:20:49 -13.9 AT Up 25.2 129.7 Low 05:13:45 - 05:27:52 5872

Wenatchee 05:20:51 -14.2 AT Up 25.4 129.4 Low 05:13:47 - 05:27:54 5831

Ellensburg 05:20:52 -14.4 AT Up 25.5 129.0 Low 05:13:48 - 05:27:55 5795

Yakima 05:20:52 -14.7 AT Up 25.8 128.9 Low 05:13:49 - 05:27:56 5761

Toppenish/White Swan 05:20:52 -15.0 AT Up 26.0 128.9 Low 05:13:48 - 05:27:55 5746

PNWRO 05:20:49 -15.9 AT Up 27.0 130.2 Low 05:13:46 - 05:27:53 5738

The Dalles 05:20:55 -15.2 AT Up 26.1 127.9 Low 05:13:52 - 05:27:59 5669

Maupin 05:20:56 -15.6 AT Up 26.4 127.8 Low 05:13:53 - 05:28:00 5636

Sisters 05:20:58 -16.1 AT Up 26.7 127.1 Low 05:13:55 - 05:28:02 5555

Bend 05:20:58 -16.4 AT Up 26.9 127.2 Low 05:13:55 - 05:28:02 5539

Oregon Observatory 05:20:58 -16.5 AT Up 27.0 127.0 Low 05:13:54 - 05:28:01 5522

Dunrhomin 05:20:20 -25.9 Dark Up 38.1 141.5 Up 05:13:17 - 05:27:24 5482

Nikitin 05:20:21 -26.1 Dark Up 38.2 141.4 Up 05:13:17 - 05:27:24 5466

CU-SBO 05:20:22 -26.1 Dark Up 38.2 141.3 Up 05:13:18 - 05:27:25 5459

Chiloquin 05:21:02 -17.3 AT Up 27.5 126.1 Low 05:13:58 - 05:28:05 5402

Klamath Falls 05:21:01 -17.6 AT Up 27.8 126.0 Low 05:13:58 - 05:28:05 5373

Cedarville 05:21:00 -18.9 Dark Up 29.1 127.2 Low 05:13:56 - 05:28:03 5338

Fall River/Burney 05:21:03 -18.7 Dark Up 28.7 125.9 Low 05:13:59 - 05:28:06 5275

Gimple 05:21:03 -19.6 Dark Up 29.6 125.9 Low 05:14:00 - 05:28:07 5203

Greenville 05:21:03 -19.6 Dark Up 29.5 125.9 Low 05:14:00 - 05:28:07 5202

Quincy 05:21:04 -19.7 Dark Up 29.6 125.8 Low 05:14:00 - 05:28:07 5184

Portola 05:21:02 -20.1 Dark Up 30.0 126.1 Up 05:13:59 - 05:28:06 5181

Reno 05:21:01 -20.6 Dark Up 30.6 126.6 Up 05:13:57 - 05:28:04 5167

Carson City 05:21:01 -20.9 Dark Up 30.8 126.4 Up 05:13:58 - 05:28:05 5136

Yerington 05:21:00 -21.3 Dark Up 31.3 126.9 Up 05:13:57 - 05:28:04 5128

Gardnerville 05:21:02 -21.1 Dark Up 31.0 126.4 Up 05:13:58 - 05:28:05 5114

Hawthorne 05:21:00 -22.0 Dark Up 31.9 127.2 Up 05:13:56 - 05:28:03 5095

Lee Vining 05:21:01 -22.2 Dark Up 31.9 126.5 Up 05:13:58 - 05:28:05 5036

Bishop 05:21:00 -23.0 Dark Up 32.8 126.8 Up 05:13:56 - 05:28:03 4993

Beatty 05:20:57 -24.2 Dark Up 34.1 128.1 Up 05:13:53 - 05:28:00 4979

Patrick 05:20:50 -26.7 Dark Up 36.8 130.0 Up 05:13:46 - 05:27:53 4893

Laughlin/Bullhead City 05:20:52 -26.6 Dark Up 36.5 129.1 Up 05:13:48 - 05:27:55 4857

Lake Havasu City 05:20:52 -27.3 Dark Up 37.1 129.0 Up 05:13:49 - 05:27:56 4799

George/Scottsdale 05:20:45 -29.0 Dark Up 39.1 130.9 Up 05:13:41 - 05:27:48 4772

Idyllwild 05:21:00 -26.7 Dark Up 36.0 126.3 Up 05:13:56 - 05:28:03 4684

Wildwood 05:21:05 -25.4 Dark Up 34.5 124.9 Up 05:14:01 - 05:28:08 4684

Calipatria 05:20:57 -27.8 Dark Up 37.2 127.1 Up 05:13:53 - 05:28:00 4648

Yuma 05:20:54 -28.6 Dark Up 38.0 127.6 Up 05:13:51 - 05:27:58 4623

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 523697, (2027/05/19 05:18UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 23.12  26
1Del Oph       16:14:20.7 -03:41:43  2.7  2.63  29
PPM 199363     16:09:50.5 -03:28:00  5.0  1.62  28
PPM 199221     16:02:42.5 -03:39:31  7.9  0.57  27
PPM 199243     16:03:45.8 -04:12:07  9.8  0.08  27
523697         16:03:55.7 -04:08:05 15.4        27
Positions are for J2000

Event circumstances last updated at 2024/06/21 21:28:11 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	05:20:11	-15.0	AT	Up	28.2	145.3	Low	05:13:08 - 05:27:15	6394
Kamloops	05:20:45	-11.6	NT	Up	23.3	130.4	Low	05:13:41 - 05:27:48	6088
Kelowna	05:20:45	-12.6	AT	Up	24.2	131.0	Low	05:13:41 - 05:27:48	6037
Peachland	05:20:45	-12.5	AT	Up	24.2	130.7	Low	05:13:42 - 05:27:49	6025
Summerland	05:20:45	-12.7	AT	Up	24.3	130.8	Low	05:13:42 - 05:27:49	6014
Penticton	05:20:45	-12.8	AT	Up	24.4	130.8	Low	05:13:42 - 05:27:49	6011
Oliver	05:20:45	-13.1	AT	Up	24.6	130.7	Low	05:13:42 - 05:27:49	5983
Anarchist Mountain Observatory	05:20:46	-13.3	AT	Up	24.8	130.8	Low	05:13:42 - 05:27:49	5973
Okanogan	05:20:47	-13.7	AT	Up	25.2	130.4	Low	05:13:44 - 05:27:51	5918
Brewster	05:20:48	-13.9	AT	Up	25.2	130.1	Low	05:13:45 - 05:27:52	5894
Victoria	05:20:55	-12.0	AT	Up	23.1	126.9	Low	05:13:51 - 05:27:58	5877
Manson/Chelan	05:20:49	-13.9	AT	Up	25.2	129.7	Low	05:13:45 - 05:27:52	5872
Wenatchee	05:20:51	-14.2	AT	Up	25.4	129.4	Low	05:13:47 - 05:27:54	5831
Ellensburg	05:20:52	-14.4	AT	Up	25.5	129.0	Low	05:13:48 - 05:27:55	5795
Yakima	05:20:52	-14.7	AT	Up	25.8	128.9	Low	05:13:49 - 05:27:56	5761
Toppenish/White Swan	05:20:52	-15.0	AT	Up	26.0	128.9	Low	05:13:48 - 05:27:55	5746
PNWRO	05:20:49	-15.9	AT	Up	27.0	130.2	Low	05:13:46 - 05:27:53	5738
The Dalles	05:20:55	-15.2	AT	Up	26.1	127.9	Low	05:13:52 - 05:27:59	5669
Maupin	05:20:56	-15.6	AT	Up	26.4	127.8	Low	05:13:53 - 05:28:00	5636
Sisters	05:20:58	-16.1	AT	Up	26.7	127.1	Low	05:13:55 - 05:28:02	5555
Bend	05:20:58	-16.4	AT	Up	26.9	127.2	Low	05:13:55 - 05:28:02	5539
Oregon Observatory	05:20:58	-16.5	AT	Up	27.0	127.0	Low	05:13:54 - 05:28:01	5522
Dunrhomin	05:20:20	-25.9	Dark	Up	38.1	141.5	Up	05:13:17 - 05:27:24	5482
Nikitin	05:20:21	-26.1	Dark	Up	38.2	141.4	Up	05:13:17 - 05:27:24	5466
CU-SBO	05:20:22	-26.1	Dark	Up	38.2	141.3	Up	05:13:18 - 05:27:25	5459
Chiloquin	05:21:02	-17.3	AT	Up	27.5	126.1	Low	05:13:58 - 05:28:05	5402
Klamath Falls	05:21:01	-17.6	AT	Up	27.8	126.0	Low	05:13:58 - 05:28:05	5373
Cedarville	05:21:00	-18.9	Dark	Up	29.1	127.2	Low	05:13:56 - 05:28:03	5338
Fall River/Burney	05:21:03	-18.7	Dark	Up	28.7	125.9	Low	05:13:59 - 05:28:06	5275
Gimple	05:21:03	-19.6	Dark	Up	29.6	125.9	Low	05:14:00 - 05:28:07	5203
Greenville	05:21:03	-19.6	Dark	Up	29.5	125.9	Low	05:14:00 - 05:28:07	5202
Quincy	05:21:04	-19.7	Dark	Up	29.6	125.8	Low	05:14:00 - 05:28:07	5184
Portola	05:21:02	-20.1	Dark	Up	30.0	126.1	Up	05:13:59 - 05:28:06	5181
Reno	05:21:01	-20.6	Dark	Up	30.6	126.6	Up	05:13:57 - 05:28:04	5167
Carson City	05:21:01	-20.9	Dark	Up	30.8	126.4	Up	05:13:58 - 05:28:05	5136
Yerington	05:21:00	-21.3	Dark	Up	31.3	126.9	Up	05:13:57 - 05:28:04	5128
Gardnerville	05:21:02	-21.1	Dark	Up	31.0	126.4	Up	05:13:58 - 05:28:05	5114
Hawthorne	05:21:00	-22.0	Dark	Up	31.9	127.2	Up	05:13:56 - 05:28:03	5095
Lee Vining	05:21:01	-22.2	Dark	Up	31.9	126.5	Up	05:13:58 - 05:28:05	5036
Bishop	05:21:00	-23.0	Dark	Up	32.8	126.8	Up	05:13:56 - 05:28:03	4993
Beatty	05:20:57	-24.2	Dark	Up	34.1	128.1	Up	05:13:53 - 05:28:00	4979
Patrick	05:20:50	-26.7	Dark	Up	36.8	130.0	Up	05:13:46 - 05:27:53	4893
Laughlin/Bullhead City	05:20:52	-26.6	Dark	Up	36.5	129.1	Up	05:13:48 - 05:27:55	4857
Lake Havasu City	05:20:52	-27.3	Dark	Up	37.1	129.0	Up	05:13:49 - 05:27:56	4799
George/Scottsdale	05:20:45	-29.0	Dark	Up	39.1	130.9	Up	05:13:41 - 05:27:48	4772
Idyllwild	05:21:00	-26.7	Dark	Up	36.0	126.3	Up	05:13:56 - 05:28:03	4684
Wildwood	05:21:05	-25.4	Dark	Up	34.5	124.9	Up	05:14:01 - 05:28:08	4684
Calipatria	05:20:57	-27.8	Dark	Up	37.2	127.1	Up	05:13:53 - 05:28:00	4648
Yuma	05:20:54	-28.6	Dark	Up	38.0	127.6	Up	05:13:51 - 05:27:58	4623