RECON: TNO occultation with 523675

Event between (523675) 13PV74 and star GA0820:22408268 with event index number of 2625426

Geocentric closest approach at 2026/09/22 05:52:06 UTC

J2000 position of star is 23:07:32.4 -07:53:15
Equinox of date position of star is 23:08:46.6 -07:45:30
Stellar brightness G=16.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 39 degrees from the moon. Moon is 80% illuminated.
Apparent brightness V=22.0

[RECON map]
Object is 42.4 AU from the Sun and 41.4 AU from the Earth.
Apparent velocity is 23.8 km/sec on the sky relative to the star, or, 2.9 arcsec/hr.
The 1-sigma error in the time of the event is 102 seconds.
The 1-sigma cross-track error in the shadow position is 1830 km.
The sky-plane scale is 30035.5 km/arcsec.

The object has an absolute magnitude Hv=5.7
Diameter=436.5 km assuming a 5% albedo -- 18.6 sec chord
Diameter=178.2 km assuming a 30% albedo -- 7.6 sec chord
Dynamical classification is SCATNEAR

Star training set for 523675, (2026/09/22 05:54UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:59:07.2 -29:28:47  1.2 21.86  33
81 Aqr         23:02:46.9 -06:55:02  6.1  1.73  37
PPM 207165     23:08:35.0 -07:33:00  8.0  0.21  38
PPM 207175     23:09:07.3 -07:37:22  9.6  0.13  39
523675         23:08:55.7 -07:44:33 16.8        39
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 19.4 km RECON observability=1.0 and success probability=9.4%

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

Kamloops 05:51:31 -32.8 Dark Up 29.3 159.1 Low 05:42:31 - 06:00:31 3019

Victoria 05:51:44 -33.2 Dark Up 30.6 155.3 Up 05:42:44 - 06:00:44 2988

Peachland 05:51:32 -33.7 Dark Up 30.3 159.6 Up 05:42:32 - 06:00:32 2964

Kelowna 05:51:31 -33.7 Dark Up 30.3 160.0 Up 05:42:31 - 06:00:31 2962

Summerland 05:51:31 -33.9 Dark Up 30.5 159.7 Up 05:42:31 - 06:00:31 2955

Penticton 05:51:31 -34.0 Dark Up 30.6 159.8 Up 05:42:31 - 06:00:31 2949

Oliver 05:51:32 -34.3 Dark Up 30.9 159.7 Up 05:42:32 - 06:00:32 2933

Anarchist Mountain Observatory 05:51:32 -34.5 Dark Up 31.1 159.9 Up 05:42:32 - 06:00:32 2921

Okanogan 05:51:34 -34.9 Dark Up 31.7 159.6 Up 05:42:34 - 06:00:34 2894

Brewster 05:51:35 -35.0 Dark Up 31.9 159.3 Up 05:42:35 - 06:00:35 2885

Manson/Chelan 05:51:37 -35.0 Dark Up 32.0 158.8 Up 05:42:37 - 06:00:37 2884

Wenatchee 05:51:37 -35.3 Dark Up 32.4 158.5 Up 05:42:37 - 06:00:37 2864

Ellensburg 05:51:39 -35.6 Dark Up 32.7 158.2 Up 05:42:39 - 06:00:39 2849

Yakima 05:51:40 -35.9 Dark Up 33.1 158.1 Up 05:42:40 - 06:00:40 2828

Toppenish/White Swan 05:51:40 -36.1 Dark Up 33.3 158.2 Up 05:42:40 - 06:00:40 2813

The Dalles 05:51:43 -36.4 Dark Up 33.9 157.1 Up 05:42:43 - 06:00:43 2792

Maupin 05:51:45 -36.8 Dark Up 34.3 157.1 Up 05:42:45 - 06:00:45 2767

PNWRO 05:51:37 -37.1 Dark Up 34.1 159.8 Up 05:42:37 - 06:00:37 2758

Sleaford 05:50:51 -35.8 Dark Up 29.9 175.4 Low 05:41:51 - 05:59:51 2747

Sisters 05:51:48 -37.2 Dark Up 35.0 156.3 Up 05:42:48 - 06:00:48 2732

Bend 05:51:48 -37.5 Dark Up 35.2 156.6 Up 05:42:48 - 06:00:48 2713

Oregon Observatory 05:51:48 -37.6 Dark Up 35.4 156.4 Up 05:42:48 - 06:00:48 2707

Chiloquin 05:51:52 -38.3 Dark Up 36.4 155.5 Up 05:42:52 - 06:00:52 2643

Klamath Falls 05:51:53 -38.6 Dark Up 36.8 155.5 Up 05:42:53 - 06:00:53 2622

Fall River/Burney 05:51:54 -39.7 Dark Up 38.0 155.6 Up 05:42:54 - 06:00:54 2543

Cedarville 05:51:49 -39.9 Dark Up 37.9 157.2 Up 05:42:49 - 06:00:49 2540

Greenville 05:51:55 -40.6 Dark Up 38.9 155.8 Up 05:42:55 - 06:00:55 2477

Gimple 05:51:54 -40.6 Dark Up 39.0 155.9 Up 05:42:54 - 06:00:54 2474

Quincy 05:51:55 -40.7 Dark Up 39.1 155.8 Up 05:42:55 - 06:00:55 2464

Portola 05:51:53 -41.1 Dark Up 39.4 156.3 Up 05:42:53 - 06:00:53 2444

Reno 05:51:52 -41.6 Dark Up 39.8 157.0 Up 05:42:52 - 06:00:52 2410

Carson City 05:51:53 -41.9 Dark Up 40.2 156.9 Up 05:42:53 - 06:00:53 2387

Gardnerville 05:51:53 -42.1 Dark Up 40.4 156.9 Up 05:42:53 - 06:00:53 2370

Yerington 05:51:51 -42.4 Dark Up 40.5 157.6 Up 05:42:51 - 06:00:51 2357

Hawthorne 05:51:50 -43.0 Dark Up 41.1 158.1 Up 05:42:50 - 06:00:50 2313

Lee Vining 05:51:54 -43.2 Dark Up 41.5 157.4 Up 05:42:54 - 06:00:54 2291

Bishop 05:51:52 -44.0 Dark Up 42.3 158.1 Up 05:42:52 - 06:00:52 2231

Beatty 05:51:47 -45.2 Dark Up 43.2 160.0 Up 05:42:47 - 06:00:47 2153

Dunrhomin 05:51:03 -47.0 Dark Up 41.8 175.8 Up 05:42:03 - 06:00:03 2032

Nikitin 05:51:03 -47.2 Dark Up 42.0 175.7 Up 05:42:03 - 06:00:03 2020

CU-SBO 05:51:04 -47.2 Dark Up 42.0 175.6 Up 05:42:04 - 06:00:04 2018

Wildwood 05:51:59 -46.3 Dark Up 45.2 156.6 Up 05:42:59 - 06:00:59 2013

Laughlin/Bullhead City 05:51:43 -47.6 Dark Up 45.4 162.4 Up 05:42:43 - 06:00:43 1968

Patrick 05:51:40 -47.8 Dark Up 45.3 163.4 Up 05:42:40 - 06:00:40 1964

Idyllwild 05:51:53 -47.6 Dark Up 46.2 159.0 Up 05:42:53 - 06:00:53 1932

Lake Havasu City 05:51:43 -48.3 Dark Up 46.1 162.5 Up 05:42:43 - 06:00:43 1912

Calipatria 05:51:50 -48.7 Dark Up 47.1 160.4 Up 05:42:50 - 06:00:50 1850

Yuma 05:51:48 -49.5 Dark Up 47.7 161.5 Up 05:42:48 - 06:00:48 1791

George/Scottsdale 05:51:36 -50.1 Dark Up 47.4 165.7 Up 05:42:36 - 06:00:36 1780

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 523675, (2026/09/22 05:54UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.6 -29:37:24  1.2 21.86  33
81 Aqr         23:01:23.6 -07:03:40  6.1  1.73  37
PPM 207165     23:07:11.8 -07:41:42  8.0  0.21  38
PPM 207175     23:07:44.0 -07:46:04  9.6  0.13  39
523675         23:07:32.4 -07:53:15 16.8        38
Positions are for J2000

Event circumstances last updated at 2023/10/25 01:50:43 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)
Kamloops	05:51:31	-32.8	Dark	Up	29.3	159.1	Low	05:42:31 - 06:00:31	3019
Victoria	05:51:44	-33.2	Dark	Up	30.6	155.3	Up	05:42:44 - 06:00:44	2988
Peachland	05:51:32	-33.7	Dark	Up	30.3	159.6	Up	05:42:32 - 06:00:32	2964
Kelowna	05:51:31	-33.7	Dark	Up	30.3	160.0	Up	05:42:31 - 06:00:31	2962
Summerland	05:51:31	-33.9	Dark	Up	30.5	159.7	Up	05:42:31 - 06:00:31	2955
Penticton	05:51:31	-34.0	Dark	Up	30.6	159.8	Up	05:42:31 - 06:00:31	2949
Oliver	05:51:32	-34.3	Dark	Up	30.9	159.7	Up	05:42:32 - 06:00:32	2933
Anarchist Mountain Observatory	05:51:32	-34.5	Dark	Up	31.1	159.9	Up	05:42:32 - 06:00:32	2921
Okanogan	05:51:34	-34.9	Dark	Up	31.7	159.6	Up	05:42:34 - 06:00:34	2894
Brewster	05:51:35	-35.0	Dark	Up	31.9	159.3	Up	05:42:35 - 06:00:35	2885
Manson/Chelan	05:51:37	-35.0	Dark	Up	32.0	158.8	Up	05:42:37 - 06:00:37	2884
Wenatchee	05:51:37	-35.3	Dark	Up	32.4	158.5	Up	05:42:37 - 06:00:37	2864
Ellensburg	05:51:39	-35.6	Dark	Up	32.7	158.2	Up	05:42:39 - 06:00:39	2849
Yakima	05:51:40	-35.9	Dark	Up	33.1	158.1	Up	05:42:40 - 06:00:40	2828
Toppenish/White Swan	05:51:40	-36.1	Dark	Up	33.3	158.2	Up	05:42:40 - 06:00:40	2813
The Dalles	05:51:43	-36.4	Dark	Up	33.9	157.1	Up	05:42:43 - 06:00:43	2792
Maupin	05:51:45	-36.8	Dark	Up	34.3	157.1	Up	05:42:45 - 06:00:45	2767
PNWRO	05:51:37	-37.1	Dark	Up	34.1	159.8	Up	05:42:37 - 06:00:37	2758
Sleaford	05:50:51	-35.8	Dark	Up	29.9	175.4	Low	05:41:51 - 05:59:51	2747
Sisters	05:51:48	-37.2	Dark	Up	35.0	156.3	Up	05:42:48 - 06:00:48	2732
Bend	05:51:48	-37.5	Dark	Up	35.2	156.6	Up	05:42:48 - 06:00:48	2713
Oregon Observatory	05:51:48	-37.6	Dark	Up	35.4	156.4	Up	05:42:48 - 06:00:48	2707
Chiloquin	05:51:52	-38.3	Dark	Up	36.4	155.5	Up	05:42:52 - 06:00:52	2643
Klamath Falls	05:51:53	-38.6	Dark	Up	36.8	155.5	Up	05:42:53 - 06:00:53	2622
Fall River/Burney	05:51:54	-39.7	Dark	Up	38.0	155.6	Up	05:42:54 - 06:00:54	2543
Cedarville	05:51:49	-39.9	Dark	Up	37.9	157.2	Up	05:42:49 - 06:00:49	2540
Greenville	05:51:55	-40.6	Dark	Up	38.9	155.8	Up	05:42:55 - 06:00:55	2477
Gimple	05:51:54	-40.6	Dark	Up	39.0	155.9	Up	05:42:54 - 06:00:54	2474
Quincy	05:51:55	-40.7	Dark	Up	39.1	155.8	Up	05:42:55 - 06:00:55	2464
Portola	05:51:53	-41.1	Dark	Up	39.4	156.3	Up	05:42:53 - 06:00:53	2444
Reno	05:51:52	-41.6	Dark	Up	39.8	157.0	Up	05:42:52 - 06:00:52	2410
Carson City	05:51:53	-41.9	Dark	Up	40.2	156.9	Up	05:42:53 - 06:00:53	2387
Gardnerville	05:51:53	-42.1	Dark	Up	40.4	156.9	Up	05:42:53 - 06:00:53	2370
Yerington	05:51:51	-42.4	Dark	Up	40.5	157.6	Up	05:42:51 - 06:00:51	2357
Hawthorne	05:51:50	-43.0	Dark	Up	41.1	158.1	Up	05:42:50 - 06:00:50	2313
Lee Vining	05:51:54	-43.2	Dark	Up	41.5	157.4	Up	05:42:54 - 06:00:54	2291
Bishop	05:51:52	-44.0	Dark	Up	42.3	158.1	Up	05:42:52 - 06:00:52	2231
Beatty	05:51:47	-45.2	Dark	Up	43.2	160.0	Up	05:42:47 - 06:00:47	2153
Dunrhomin	05:51:03	-47.0	Dark	Up	41.8	175.8	Up	05:42:03 - 06:00:03	2032
Nikitin	05:51:03	-47.2	Dark	Up	42.0	175.7	Up	05:42:03 - 06:00:03	2020
CU-SBO	05:51:04	-47.2	Dark	Up	42.0	175.6	Up	05:42:04 - 06:00:04	2018
Wildwood	05:51:59	-46.3	Dark	Up	45.2	156.6	Up	05:42:59 - 06:00:59	2013
Laughlin/Bullhead City	05:51:43	-47.6	Dark	Up	45.4	162.4	Up	05:42:43 - 06:00:43	1968
Patrick	05:51:40	-47.8	Dark	Up	45.3	163.4	Up	05:42:40 - 06:00:40	1964
Idyllwild	05:51:53	-47.6	Dark	Up	46.2	159.0	Up	05:42:53 - 06:00:53	1932
Lake Havasu City	05:51:43	-48.3	Dark	Up	46.1	162.5	Up	05:42:43 - 06:00:43	1912
Calipatria	05:51:50	-48.7	Dark	Up	47.1	160.4	Up	05:42:50 - 06:00:50	1850
Yuma	05:51:48	-49.5	Dark	Up	47.7	161.5	Up	05:42:48 - 06:00:48	1791
George/Scottsdale	05:51:36	-50.1	Dark	Up	47.4	165.7	Up	05:42:36 - 06:00:36	1780