RECON: TNO occultation with 523717

Event between (523717) 14KY101 and star GA0680:17416126 with event index number of 2618487

Geocentric closest approach at 2026/08/05 03:51:22 UTC

J2000 position of star is 17:44:25.1 -21:52:38
Equinox of date position of star is 17:45:53.5 -21:53:10
Stellar brightness G=15.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 124 degrees from the moon. Moon is 61% illuminated.
Apparent brightness V=22.2

[RECON map]
Object is 36.4 AU from the Sun and 35.7 AU from the Earth.
Apparent velocity is 15.3 km/sec on the sky relative to the star, or, 2.1 arcsec/hr.
The 1-sigma error in the time of the event is 726 seconds.
The 1-sigma cross-track error in the shadow position is 4311 km.
The sky-plane scale is 25917.8 km/arcsec.

The object has an absolute magnitude Hv=6.5
Diameter=316.2 km assuming a 5% albedo -- 19.8 sec chord
Diameter=129.1 km assuming a 30% albedo -- 8.1 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 523717, (2026/08/05 03:51UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:02.5 -26:29:19  0.9 17.69 141
35Eta Oph      17:11:54.3 -15:45:21  2.6 10.13 131
58 Oph         17:45:01.5 -21:41:37  4.9  0.30 124
PPM 267230     17:46:48.6 -21:43:07  8.5  0.25 124
PPM 267212     17:45:57.2 -21:44:29  8.8  0.15 124
523717         17:46:01.1 -21:53:12 15.4       124
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 1.2 sigma about the mid-time.
The median site spacing is 61.5 km RECON observability=0.1 and success probability=0.3%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 03:51:00 -8.6 NT Down 16.0 179.5 Really Low 03:36:00 - 04:06:00 12880
Kamloops 03:52:04 -2.4 CT Down 16.3 165.8 Really Low 03:37:04 - 04:07:04 12849
Kelowna 03:52:02 -3.3 CT Down 17.2 166.6 Really Low 03:37:02 - 04:07:02 12824
Peachland 03:52:02 -3.2 CT Down 17.3 166.3 Really Low 03:37:02 - 04:07:02 12819
Summerland 03:52:02 -3.3 CT Down 17.4 166.3 Really Low 03:37:02 - 04:07:02 12814
Penticton 03:52:02 -3.4 CT Down 17.5 166.4 Really Low 03:37:02 - 04:07:02 12812
Oliver 03:52:03 -3.6 CT Down 17.9 166.4 Really Low 03:37:03 - 04:07:03 12800
Anarchist Mountain Observatory 03:52:02 -3.8 CT Down 18.1 166.6 Really Low 03:37:02 - 04:07:02 12795
Okanogan 03:52:04 -4.0 CT Down 18.7 166.3 Really Low 03:37:04 - 04:07:04 12770
Victoria 03:52:21 -1.7 CT Down 17.8 162.7 Really Low 03:37:21 - 04:07:21 12764
Brewster 03:52:05 -4.0 CT Down 18.9 166.1 Really Low 03:37:05 - 04:07:05 12759
Manson/Chelan 03:52:08 -3.9 CT Down 19.0 165.8 Really Low 03:37:08 - 04:07:08 12751
Wenatchee 03:52:08 -4.1 CT Down 19.5 165.6 Really Low 03:37:08 - 04:07:08 12732
Ellensburg 03:52:11 -4.1 CT Down 19.8 165.3 Really Low 03:37:11 - 04:07:11 12715
Yakima 03:52:10 -4.3 CT Down 20.2 165.3 Low 03:37:10 - 04:07:10 12699
Toppenish/White Swan 03:52:10 -4.5 CT Down 20.5 165.4 Low 03:37:10 - 04:07:10 12691
PNWRO 03:52:05 -5.6 CT Down 21.1 166.8 Low 03:37:05 - 04:07:05 12679
The Dalles 03:52:15 -4.5 CT Down 21.1 164.6 Low 03:37:15 - 04:07:15 12656
Maupin 03:52:15 -4.7 CT Down 21.5 164.6 Low 03:37:15 - 04:07:15 12639
Sisters 03:52:20 -4.9 CT Down 22.2 164.1 Low 03:37:20 - 04:07:20 12600
Bend 03:52:19 -5.2 CT Down 22.5 164.3 Low 03:37:19 - 04:07:19 12590
Oregon Observatory 03:52:20 -5.2 CT Down 22.7 164.2 Low 03:37:20 - 04:07:20 12582
Chiloquin 03:52:23 -5.6 CT Down 23.9 163.6 Low 03:37:23 - 04:07:23 12519
Klamath Falls 03:52:24 -5.8 CT Down 24.2 163.6 Low 03:37:24 - 04:07:24 12503
Cedarville 03:52:16 -7.2 NT Down 25.2 165.1 Low 03:37:16 - 04:07:16 12474
Fall River/Burney 03:52:23 -6.6 NT Down 25.4 163.9 Low 03:37:23 - 04:07:23 12446
Gimple 03:52:21 -7.4 NT Down 26.4 164.3 Low 03:37:21 - 04:07:21 12402
Greenville 03:52:22 -7.4 NT Down 26.4 164.2 Low 03:37:22 - 04:07:22 12402
Quincy 03:52:24 -7.5 NT Down 26.6 164.2 Low 03:37:24 - 04:07:24 12391
Dunrhomin 03:51:00 -16.9 AT Down 27.9 180.2 Low 03:36:00 - 04:06:00 12389
Portola 03:52:21 -7.8 NT Down 26.8 164.6 Low 03:37:21 - 04:07:21 12386
Nikitin 03:51:00 -17.0 AT Down 28.1 180.2 Low 03:36:00 - 04:06:00 12379
CU-SBO 03:51:00 -17.0 AT Down 28.1 180.1 Low 03:36:00 - 04:06:00 12376
Reno 03:52:17 -8.4 NT Down 27.2 165.2 Low 03:37:17 - 04:07:17 12374
Carson City 03:52:18 -8.6 NT Down 27.5 165.2 Low 03:37:18 - 04:07:18 12355
Yerington 03:52:14 -9.1 NT Down 27.8 165.8 Low 03:37:14 - 04:07:14 12346
Gardnerville 03:52:19 -8.7 NT Down 27.8 165.2 Low 03:37:19 - 04:07:19 12342
Hawthorne 03:52:12 -9.7 NT Down 28.4 166.3 Low 03:37:12 - 04:07:12 12322
Lee Vining 03:52:16 -9.7 NT Down 28.8 165.7 Low 03:37:16 - 04:07:16 12291
Bishop 03:52:13 -10.5 NT Down 29.6 166.4 Low 03:37:13 - 04:07:13 12258
Beatty 03:52:04 -11.8 NT Down 30.3 168.0 Up 03:37:04 - 04:07:04 12234
Patrick 03:51:49 -14.5 AT Down 32.2 170.9 Up 03:36:49 - 04:06:49 12147
Laughlin/Bullhead City 03:51:53 -14.2 AT Down 32.3 170.1 Up 03:36:53 - 04:06:53 12132
Lake Havasu City 03:51:53 -14.7 AT Down 33.0 170.3 Up 03:36:53 - 04:06:53 12091
Wildwood 03:52:17 -12.0 NT Down 32.7 165.7 Up 03:37:17 - 04:07:17 12064
Idyllwild 03:52:08 -13.5 AT Down 33.4 167.7 Up 03:37:08 - 04:07:08 12046
George/Scottsdale 03:51:40 -16.8 AT Down 34.1 172.9 Up 03:36:40 - 04:06:40 12041
Calipatria 03:52:01 -14.6 AT Down 34.2 168.9 Up 03:37:01 - 04:07:01 12007
Yuma 03:51:57 -15.5 AT Down 34.8 169.8 Up 03:36:57 - 04:06:57 11979

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 523717, (2026/08/05 03:51UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 17.69 141
35Eta Oph      17:10:22.7 -15:43:29  2.6 10.13 131
58 Oph         17:43:25.7 -21:41:00  4.9  0.30 124
PPM 267230     17:45:12.7 -21:42:34  8.5  0.25 124
PPM 267212     17:44:21.3 -21:43:55  8.8  0.15 124
523717         17:44:25.1 -21:52:38 15.4       124
Positions are for J2000

Event circumstances last updated at 2024/06/19 21:32:22 UT

Marc W. Buie, Southwest Research Institute

RECON