RECON: TNO occultation with 545361

Event between (545361) 11GZ61 and star GA0660:06142295 with event index number of 2398762

Geocentric closest approach at 2026/06/13 05:39:13 UTC

J2000 position of star is 14:32:14.2 -23:01:21
Equinox of date position of star is 14:33:37.4 -23:07:44
Stellar brightness G=16.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 168 degrees from the moon. Moon is 6% illuminated.
Apparent brightness V=21.8

[RECON map]
Object is 38.9 AU from the Sun and 38.2 AU from the Earth.
Apparent velocity is 18.2 km/sec on the sky relative to the star, or, 2.4 arcsec/hr.
The 1-sigma error in the time of the event is 151 seconds.
The 1-sigma cross-track error in the shadow position is 1804 km.
The sky-plane scale is 27672.1 km/arcsec.

The object has an absolute magnitude Hv=5.8
Diameter=401.8 km assuming a 5% albedo -- 22.7 sec chord
Diameter=164.0 km assuming a 30% albedo -- 9.3 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 545361, (2026/06/13 05:45UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:35.4 -11:17:55  1.0 19.90 148
5The Cen       14:08:15.1 -36:29:53  2.1 14.45 159
PPM 262884     14:26:19.6 -24:55:30  5.3  2.46 166
PPM 263079     14:33:38.8 -23:33:44  7.4  0.42 167
PPM 263096     14:34:28.0 -23:07:11  9.8  0.17 168
545361         14:33:44.8 -23:08:18 16.4       168
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 6.7 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)
Sleaford 05:40:28 -12.5 AT Down 12.3 201.3 Really Low 05:27:23 - 05:53:34 8741
Dunrhomin 05:39:56 -23.8 Dark Down 23.1 203.3 Low 05:26:50 - 05:53:01 8484
Nikitin 05:39:57 -24.0 Dark Down 23.3 203.3 Low 05:26:52 - 05:53:03 8477
CU-SBO 05:39:54 -24.0 Dark Down 23.4 203.3 Low 05:26:49 - 05:53:00 8473
Kelowna 05:41:10 -10.9 NT Down 16.6 189.0 Really Low 05:28:04 - 05:54:15 8378
Kamloops 05:41:15 -9.9 NT Down 15.9 188.1 Really Low 05:28:09 - 05:54:20 8371
Penticton 05:41:11 -11.1 NT Down 17.0 188.9 Really Low 05:28:05 - 05:54:16 8367
Peachland 05:41:10 -10.9 NT Down 16.8 188.7 Really Low 05:28:05 - 05:54:16 8367
Summerland 05:41:11 -11.0 NT Down 16.9 188.8 Really Low 05:28:06 - 05:54:17 8366
Anarchist Mountain Observatory 05:41:09 -11.6 NT Down 17.5 189.1 Really Low 05:28:03 - 05:54:14 8361
Oliver 05:41:08 -11.4 NT Down 17.3 188.9 Really Low 05:28:02 - 05:54:13 8359
Okanogan 05:41:09 -12.1 AT Down 18.1 188.9 Really Low 05:28:03 - 05:54:14 8337
Brewster 05:41:10 -12.3 AT Down 18.4 188.7 Really Low 05:28:04 - 05:54:15 8324
Manson/Chelan 05:41:10 -12.3 AT Down 18.7 188.4 Really Low 05:28:04 - 05:54:15 8308
PNWRO 05:41:03 -14.4 AT Down 20.4 189.7 Low 05:27:57 - 05:54:08 8292
Wenatchee 05:41:11 -12.7 AT Down 19.2 188.2 Really Low 05:28:06 - 05:54:17 8289
Ellensburg 05:41:08 -12.9 AT Down 19.6 188.0 Really Low 05:28:03 - 05:54:14 8271
Yakima 05:41:08 -13.3 AT Down 20.0 188.0 Really Low 05:28:02 - 05:54:13 8259
Toppenish/White Swan 05:41:09 -13.5 AT Down 20.2 188.2 Low 05:28:03 - 05:54:14 8257
Victoria 05:41:23 -10.6 NT Down 18.3 185.3 Really Low 05:28:17 - 05:54:28 8227
The Dalles 05:41:09 -13.8 AT Down 21.0 187.5 Low 05:28:04 - 05:54:15 8209
Maupin 05:41:11 -14.2 AT Down 21.4 187.6 Low 05:28:06 - 05:54:17 8199
Bend 05:41:09 -15.1 AT Down 22.6 187.4 Low 05:28:03 - 05:54:14 8154
Sisters 05:41:09 -14.8 AT Down 22.4 187.2 Low 05:28:04 - 05:54:15 8154
Oregon Observatory 05:41:10 -15.2 AT Down 22.8 187.3 Low 05:28:04 - 05:54:15 8144
Cedarville 05:40:59 -17.6 AT Down 25.0 188.7 Low 05:27:54 - 05:54:05 8101
Chiloquin 05:41:07 -16.1 AT Down 24.1 187.0 Low 05:28:01 - 05:54:12 8083
Klamath Falls 05:41:07 -16.4 AT Down 24.4 187.1 Low 05:28:02 - 05:54:13 8073
Patrick 05:40:20 -25.3 Dark Down 29.9 195.7 Low 05:27:15 - 05:53:26 8051
Fall River/Burney 05:41:04 -17.5 AT Down 25.6 187.5 Low 05:27:59 - 05:54:10 8040
George/Scottsdale 05:40:07 -27.6 Dark Down 31.1 198.0 Up 05:27:01 - 05:53:12 8035
Reno 05:40:55 -19.4 Dark Down 26.9 189.2 Low 05:27:50 - 05:54:01 8034
Yerington 05:40:50 -20.2 Dark Down 27.3 189.9 Low 05:27:45 - 05:53:56 8033
Hawthorne 05:40:48 -20.8 Dark Down 27.7 190.5 Low 05:27:43 - 05:53:54 8031
Beatty 05:40:37 -22.9 Dark Down 29.0 192.5 Low 05:27:32 - 05:53:43 8023
Portola 05:40:57 -18.9 Dark Down 26.7 188.5 Low 05:27:52 - 05:54:03 8023
Gimple 05:41:00 -18.5 Dark Down 26.4 188.1 Low 05:27:55 - 05:54:06 8022
Carson City 05:40:56 -19.7 Dark Down 27.2 189.2 Low 05:27:50 - 05:54:01 8020
Greenville 05:41:02 -18.5 Dark Down 26.4 188.0 Low 05:27:56 - 05:54:07 8020
Laughlin/Bullhead City 05:40:22 -25.3 Dark Down 30.3 195.0 Up 05:27:17 - 05:53:28 8016
Quincy 05:40:59 -18.6 Dark Down 26.6 188.0 Low 05:27:54 - 05:54:05 8011
Gardnerville 05:40:53 -19.9 Dark Down 27.5 189.3 Low 05:27:47 - 05:53:58 8011
Lake Havasu City 05:40:21 -26.0 Dark Down 30.9 195.3 Up 05:27:15 - 05:53:26 7993
Lee Vining 05:40:50 -21.0 Dark Down 28.4 190.0 Low 05:27:44 - 05:53:55 7991
Bishop 05:40:43 -21.8 Dark Down 28.8 190.8 Low 05:27:38 - 05:53:49 7989
Yuma 05:40:18 -27.4 Dark Down 32.7 195.3 Up 05:27:12 - 05:53:23 7896
Calipatria 05:40:22 -26.6 Dark Down 32.5 194.3 Up 05:27:17 - 05:53:28 7887
Idyllwild 05:40:30 -25.6 Dark Down 32.1 193.0 Up 05:27:25 - 05:53:36 7878
Wildwood 05:40:39 -24.5 Dark Down 32.1 190.9 Up 05:27:34 - 05:53:45 7829

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 545361, (2026/06/13 05:45UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 19.90 148
5The Cen       14:06:40.0 -36:22:23  2.1 14.45 159
PPM 262884     14:24:48.5 -24:48:23  5.3  2.46 166
PPM 263079     14:32:08.0 -23:26:47  7.4  0.42 167
PPM 263096     14:32:57.4 -23:00:16  9.8  0.17 168
545361         14:32:14.2 -23:01:21 16.4       167
Positions are for J2000

Event circumstances last updated at 2024/04/18 03:44:20 UT

Marc W. Buie, Southwest Research Institute

RECON