RECON: TNO occultation with 523787

Event between (523787) 15DV224 and star GA0780:04370910 with event index number of 2607425

Geocentric closest approach at 2026/06/06 06:09:12 UTC

J2000 position of star is 13:22:35.8 -11:27:50
Equinox of date position of star is 13:23:53.0 -11:35:25
Stellar brightness G=16.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 117 degrees from the moon. Moon is 71% illuminated.
Apparent brightness V=22.8

[RECON map]
Object is 31.2 AU from the Sun and 30.6 AU from the Earth.
Apparent velocity is 13.8 km/sec on the sky relative to the star, or, 2.2 arcsec/hr.
The 1-sigma error in the time of the event is 132 seconds.
The 1-sigma cross-track error in the shadow position is 1678 km.
The sky-plane scale is 22196.9 km/arcsec.

The object has an absolute magnitude Hv=7.7
Diameter=166.0 km assuming a 5% albedo -- 12.8 sec chord
Diameter=67.8 km assuming a 30% albedo -- 5.2 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 523787, (2026/06/06 06:12UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:35.4 -11:17:54  1.0  0.70 117
68 Vir         13:28:07.2 -12:50:40  5.3  1.60 116
PPM 227171     13:22:59.1 -11:53:06  7.7  0.38 117
PPM 227190     13:23:40.5 -11:45:43  9.5  0.18 117
523787         13:23:59.7 -11:36:05 16.0       117
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 7.2 km RECON observability=0.8 and success probability=1.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 06:10:48 -14.4 AT Down 17.4 222.2 Really Low 05:59:18 - 06:22:19 4638
Dunrhomin 06:09:37 -26.0 Dark Down 25.7 225.8 Low 05:58:07 - 06:21:08 4441
Nikitin 06:09:38 -26.2 Dark Down 25.8 225.9 Low 05:58:07 - 06:21:08 4435
CU-SBO 06:09:36 -26.3 Dark Down 25.9 225.8 Low 05:58:05 - 06:21:06 4431
Kelowna 06:11:25 -13.8 AT Down 24.1 209.6 Low 05:59:55 - 06:22:56 4212
Penticton 06:11:23 -14.1 AT Down 24.5 209.6 Low 05:59:53 - 06:22:54 4202
Peachland 06:11:26 -13.8 AT Down 24.3 209.4 Low 05:59:55 - 06:22:56 4200
Summerland 06:11:25 -14.0 AT Down 24.4 209.5 Low 05:59:54 - 06:22:55 4200
Kamloops 06:11:34 -12.9 AT Down 23.7 208.6 Low 06:00:04 - 06:23:05 4198
Anarchist Mountain Observatory 06:11:20 -14.6 AT Down 24.8 209.9 Low 05:59:50 - 06:22:51 4198
Oliver 06:11:22 -14.4 AT Down 24.8 209.7 Low 05:59:52 - 06:22:53 4194
Okanogan 06:11:19 -15.1 AT Down 25.5 209.8 Low 05:59:49 - 06:22:50 4175
Brewster 06:11:18 -15.3 AT Down 25.8 209.7 Low 05:59:48 - 06:22:49 4162
Manson/Chelan 06:11:19 -15.4 AT Down 26.1 209.4 Low 05:59:49 - 06:22:50 4144
PNWRO 06:11:04 -17.5 AT Down 27.3 211.1 Low 05:59:34 - 06:22:35 4141
Wenatchee 06:11:17 -15.8 AT Down 26.6 209.3 Low 05:59:47 - 06:22:48 4126
Ellensburg 06:11:16 -16.1 AT Down 27.0 209.2 Low 05:59:45 - 06:22:46 4108
Toppenish/White Swan 06:11:13 -16.7 AT Down 27.5 209.5 Low 05:59:42 - 06:22:43 4097
Yakima 06:11:17 -16.5 AT Down 27.4 209.3 Low 05:59:47 - 06:22:48 4097
The Dalles 06:11:12 -17.1 AT Down 28.4 208.8 Low 05:59:42 - 06:22:43 4046
Victoria 06:11:35 -13.9 AT Down 26.5 205.9 Low 06:00:04 - 06:23:05 4043
Maupin 06:11:10 -17.5 AT Down 28.8 209.0 Low 05:59:40 - 06:22:41 4038
Bend 06:11:06 -18.5 Dark Down 29.8 209.1 Low 05:59:35 - 06:22:36 3996
Sisters 06:11:09 -18.2 Dark Down 29.7 208.8 Low 05:59:38 - 06:22:39 3993
Oregon Observatory 06:11:06 -18.6 Dark Down 30.0 209.0 Up 05:59:36 - 06:22:37 3985
George/Scottsdale 06:09:30 -30.8 Dark Down 34.1 222.2 Up 05:58:00 - 06:21:01 3977
Patrick 06:09:49 -28.6 Dark Down 33.9 219.5 Up 05:58:18 - 06:21:19 3972
Cedarville 06:10:49 -21.1 Dark Down 31.6 211.0 Up 05:59:18 - 06:22:19 3957
Laughlin/Bullhead City 06:09:51 -28.6 Dark Down 34.4 218.9 Up 05:58:21 - 06:21:22 3933
Chiloquin 06:11:01 -19.6 Dark Down 31.3 208.9 Up 05:59:31 - 06:22:32 3926
Beatty 06:10:10 -26.3 Dark Down 34.1 216.0 Up 05:58:40 - 06:21:41 3919
Klamath Falls 06:11:00 -19.9 Dark Down 31.6 209.1 Up 05:59:29 - 06:22:30 3917
Lake Havasu City 06:09:46 -29.3 Dark Down 34.8 219.5 Up 05:58:16 - 06:21:17 3915
Hawthorne 06:10:27 -24.3 Dark Down 33.6 213.5 Up 05:58:57 - 06:21:58 3908
Yerington 06:10:32 -23.7 Dark Down 33.4 212.8 Up 05:59:01 - 06:22:02 3905
Reno 06:10:38 -22.9 Dark Down 33.2 212.0 Up 05:59:07 - 06:22:08 3899
Fall River/Burney 06:10:52 -21.1 Dark Down 32.5 209.8 Up 05:59:22 - 06:22:23 3891
Carson City 06:10:36 -23.3 Dark Down 33.5 212.1 Up 05:59:06 - 06:22:07 3887
Portola 06:10:42 -22.5 Dark Down 33.2 211.2 Up 05:59:11 - 06:22:12 3883
Gardnerville 06:10:34 -23.5 Dark Down 33.7 212.2 Up 05:59:04 - 06:22:05 3879
Gimple 06:10:45 -22.1 Dark Down 33.1 210.7 Up 05:59:14 - 06:22:15 3879
Greenville 06:10:46 -22.0 Dark Down 33.1 210.6 Up 05:59:16 - 06:22:17 3876
Bishop 06:10:20 -25.4 Dark Down 34.5 214.2 Up 05:58:49 - 06:21:50 3872
Quincy 06:10:44 -22.2 Dark Down 33.3 210.6 Up 05:59:14 - 06:22:15 3868
Lee Vining 06:10:27 -24.6 Dark Down 34.3 213.2 Up 05:58:56 - 06:21:57 3867
Yuma 06:09:38 -30.8 Dark Down 36.4 219.9 Up 05:58:08 - 06:21:09 3822
Calipatria 06:09:44 -30.1 Dark Down 36.5 218.8 Up 05:58:14 - 06:21:15 3806
Idyllwild 06:09:54 -29.2 Dark Down 36.7 217.4 Up 05:58:24 - 06:21:25 3786
Wildwood 06:10:05 -28.2 Dark Down 37.3 215.2 Up 05:58:35 - 06:21:36 3722

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 523787, (2026/06/06 06:12UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0  0.70 117
68 Vir         13:26:43.0 -12:42:28  5.3  1.60 116
PPM 227171     13:21:35.2 -11:44:50  7.7  0.38 117
PPM 227190     13:22:16.6 -11:37:28  9.5  0.18 117
523787         13:22:35.8 -11:27:50 16.0       117
Positions are for J2000

Event circumstances last updated at 2024/04/23 03:24:50 UT

Marc W. Buie, Southwest Research Institute

RECON