RECON: TNO occultation with 523717

Event between (523717) 14KY101 and star GA0680:17938269 with event index number of 2618418

Geocentric closest approach at 2026/07/14 05:19:06 UTC

J2000 position of star is 17:46:03.9 -21:51:39
Equinox of date position of star is 17:47:32.3 -21:52:07
Stellar brightness G=16.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 157 degrees from the moon. Moon is 0% illuminated.
Apparent brightness V=22.1

[RECON map]
Object is 36.4 AU from the Sun and 35.5 AU from the Earth.
Apparent velocity is 21.7 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 540 seconds.
The 1-sigma cross-track error in the shadow position is 2685 km.
The sky-plane scale is 25753.6 km/arcsec.

The object has an absolute magnitude Hv=6.5
Diameter=316.2 km assuming a 5% albedo -- 14.0 sec chord
Diameter=129.1 km assuming a 30% albedo -- 5.7 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 523717, (2026/07/14 05:19UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:02.3 -26:29:19  0.9 18.05 141
35Eta Oph      17:11:54.1 -15:45:21  2.6 10.43 147
58 Oph         17:45:01.3 -21:41:37  4.9  0.64 156
PPM 267230     17:46:48.4 -21:43:07  8.5  0.25 157
523717         17:47:39.7 -21:52:10 16.4       157
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 1.7 sigma about the mid-time.
The median site spacing is 17.2 km RECON observability=0.5 and success probability=4.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 05:19:00 -12.4 AT Down 16.1 179.4 Really Low 05:04:00 - 05:34:00 3145
Kamloops 05:19:46 -8.8 NT Down 16.3 165.7 Really Low 05:04:46 - 05:34:46 3079
Kelowna 05:19:44 -9.8 NT Down 17.2 166.4 Really Low 05:04:44 - 05:34:44 3055
Peachland 05:19:45 -9.7 NT Down 17.3 166.2 Really Low 05:04:45 - 05:34:45 3050
Summerland 05:19:45 -9.9 NT Down 17.4 166.2 Really Low 05:04:45 - 05:34:45 3045
Penticton 05:19:45 -10.0 NT Down 17.5 166.3 Really Low 05:04:45 - 05:34:45 3043
Oliver 05:19:45 -10.3 NT Down 17.9 166.3 Really Low 05:04:45 - 05:34:45 3030
Anarchist Mountain Observatory 05:19:44 -10.5 NT Down 18.1 166.5 Really Low 05:04:44 - 05:34:44 3025
Okanogan 05:19:46 -10.9 NT Down 18.7 166.2 Really Low 05:04:46 - 05:34:46 2999
Brewster 05:19:46 -11.0 NT Down 18.9 166.0 Really Low 05:04:46 - 05:34:46 2988
Victoria 05:19:58 -9.2 NT Down 17.8 162.6 Really Low 05:04:58 - 05:34:58 2985
Manson/Chelan 05:19:48 -11.0 NT Down 19.0 165.6 Really Low 05:04:48 - 05:34:48 2978
Wenatchee 05:19:49 -11.3 NT Down 19.5 165.4 Really Low 05:04:49 - 05:34:49 2959
Ellensburg 05:19:50 -11.6 NT Down 19.8 165.2 Really Low 05:04:50 - 05:34:50 2941
Yakima 05:19:50 -11.9 NT Down 20.2 165.1 Low 05:04:50 - 05:34:50 2925
Toppenish/White Swan 05:19:51 -12.1 AT Down 20.5 165.3 Low 05:04:51 - 05:34:51 2917
PNWRO 05:19:46 -13.0 AT Down 21.1 166.7 Low 05:04:46 - 05:34:46 2908
The Dalles 05:19:54 -12.4 AT Down 21.1 164.5 Low 05:04:54 - 05:34:54 2879
Maupin 05:19:54 -12.7 AT Down 21.5 164.5 Low 05:04:54 - 05:34:54 2862
Sisters 05:19:57 -13.2 AT Down 22.2 163.9 Low 05:04:57 - 05:34:57 2821
Bend 05:19:56 -13.5 AT Down 22.5 164.2 Low 05:04:56 - 05:34:56 2811
Oregon Observatory 05:19:57 -13.6 AT Down 22.7 164.0 Low 05:04:57 - 05:34:57 2803
Chiloquin 05:19:59 -14.4 AT Down 23.8 163.5 Low 05:04:59 - 05:34:59 2738
Klamath Falls 05:19:59 -14.7 AT Down 24.2 163.5 Low 05:04:59 - 05:34:59 2722
Cedarville 05:19:54 -16.0 AT Down 25.2 165.0 Low 05:04:54 - 05:34:54 2697
Fall River/Burney 05:19:59 -15.7 AT Down 25.4 163.7 Low 05:04:59 - 05:34:59 2665
Dunrhomin 05:18:59 -23.2 Dark Down 27.9 180.2 Low 05:03:59 - 05:33:59 2654
Nikitin 05:18:58 -23.4 Dark Down 28.1 180.1 Low 05:03:58 - 05:33:58 2644
CU-SBO 05:18:59 -23.4 Dark Down 28.1 180.1 Low 05:03:59 - 05:33:59 2641
Gimple 05:19:58 -16.7 AT Down 26.4 164.1 Low 05:04:58 - 05:34:58 2621
Greenville 05:19:58 -16.6 AT Down 26.4 164.1 Low 05:04:58 - 05:34:58 2621
Quincy 05:19:59 -16.8 AT Down 26.6 164.0 Low 05:04:59 - 05:34:59 2610
Portola 05:19:57 -17.1 AT Down 26.8 164.5 Low 05:04:57 - 05:34:57 2607
Reno 05:19:55 -17.6 AT Down 27.2 165.1 Low 05:04:55 - 05:34:55 2596
Carson City 05:19:55 -17.9 AT Down 27.5 165.1 Low 05:04:55 - 05:34:55 2577
Yerington 05:19:53 -18.4 Dark Down 27.8 165.7 Low 05:04:53 - 05:34:53 2570
Gardnerville 05:19:55 -18.1 Dark Down 27.8 165.1 Low 05:04:55 - 05:34:55 2564
Hawthorne 05:19:51 -19.0 Dark Down 28.4 166.2 Low 05:04:51 - 05:34:51 2547
Lee Vining 05:19:54 -19.2 Dark Down 28.8 165.6 Low 05:04:54 - 05:34:54 2514
Bishop 05:19:51 -20.0 Dark Down 29.6 166.3 Low 05:04:51 - 05:34:51 2483
Beatty 05:19:45 -21.2 Dark Down 30.3 167.9 Up 05:04:45 - 05:34:45 2463
Patrick 05:19:34 -23.8 Dark Down 32.2 170.8 Up 05:04:34 - 05:34:34 2384
Laughlin/Bullhead City 05:19:37 -23.6 Dark Down 32.3 170.0 Up 05:04:37 - 05:34:37 2367
Lake Havasu City 05:19:37 -24.3 Dark Down 33.0 170.2 Up 05:04:37 - 05:34:37 2327
Wildwood 05:19:54 -22.4 Dark Down 32.7 165.6 Up 05:04:54 - 05:34:54 2287
George/Scottsdale 05:19:27 -26.1 Dark Down 34.1 172.8 Up 05:04:27 - 05:34:27 2284
Idyllwild 05:19:47 -23.7 Dark Down 33.4 167.5 Up 05:04:47 - 05:34:47 2273
Calipatria 05:19:42 -24.8 Dark Down 34.2 168.7 Up 05:04:42 - 05:34:42 2238
Yuma 05:19:39 -25.6 Dark Down 34.8 169.7 Up 05:04:39 - 05:34:39 2213

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, (2026/07/14 05:19UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 18.05 141
35Eta Oph      17:10:22.7 -15:43:29  2.6 10.43 147
58 Oph         17:43:25.7 -21:41:00  4.9  0.64 156
PPM 267230     17:45:12.7 -21:42:34  8.5  0.25 157
523717         17:46:03.9 -21:51:39 16.4       157
Positions are for J2000

Event circumstances last updated at 2024/06/19 21:31:54 UT

Marc W. Buie, Southwest Research Institute

RECON