RECON: TNO occultation with 523686

Event between (523686) 14DB143 and star GA0880:13387909 with event index number of 2623161

Geocentric closest approach at 2026/06/21 09:31:11 UTC

J2000 position of star is 19:06:49.7 -00:22:39
Equinox of date position of star is 19:08:05.2 -00:20:17
Stellar brightness G=15.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 113 degrees from the moon. Moon is 45% illuminated.
Apparent brightness V=22.3

[RECON map]
Object is 20.4 AU from the Sun and 19.5 AU from the Earth.
Apparent velocity is 21.6 km/sec on the sky relative to the star, or, 5.5 arcsec/hr.
The 1-sigma error in the time of the event is 184 seconds.
The 1-sigma cross-track error in the shadow position is 1027 km.
The sky-plane scale is 14140.3 km/arcsec.

The object has an absolute magnitude Hv=9.1
Diameter=91.2 km assuming a 5% albedo -- 4.2 sec chord
Diameter=37.2 km assuming a 30% albedo -- 1.7 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 523686, (2026/06/21 09:31UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:02.1 -26:29:18  0.9 45.95  76
Tarazed        19:47:31.1 +10:40:46  2.7 14.73 122
PPM 180573     19:11:13.3 -00:23:01  6.5  0.76 114
PPM 180540     19:06:37.5 -00:53:37  6.9  0.68 113
PPM 180558     19:08:32.7 -00:37:21  9.7  0.30 113
523686         19:08:11.3 -00:20:05 15.8       113
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 4.9 sigma about the mid-time.
The median site spacing is 30.4 km RECON observability=0.8 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 09:30:24 -8.1 NT Down 35.0 204.1 Up 09:15:24 - 09:45:24 8804
Kamloops 09:31:07 -13.4 AT Down 38.8 186.8 Up 09:16:07 - 09:46:07 8656
Kelowna 09:31:03 -13.9 AT Down 39.5 188.0 Up 09:16:03 - 09:46:03 8603
Peachland 09:31:04 -14.1 AT Down 39.6 187.7 Up 09:16:04 - 09:46:04 8594
Summerland 09:31:04 -14.2 AT Down 39.8 187.8 Up 09:16:04 - 09:46:04 8584
Penticton 09:31:04 -14.3 AT Down 39.8 187.9 Up 09:16:04 - 09:46:04 8579
Oliver 09:31:03 -14.6 AT Down 40.2 188.0 Up 09:16:03 - 09:46:03 8554
Anarchist Mountain Observatory 09:31:03 -14.7 AT Down 40.3 188.3 Up 09:16:03 - 09:46:03 8543
Okanogan 09:31:03 -15.4 AT Down 41.0 188.0 Up 09:16:03 - 09:46:03 8495
Victoria 09:31:16 -16.1 AT Down 41.1 183.0 Up 09:16:16 - 09:46:16 8491
Brewster 09:31:04 -15.7 AT Down 41.3 187.8 Up 09:16:04 - 09:46:04 8474
Manson/Chelan 09:31:05 -15.9 AT Down 41.5 187.4 Up 09:16:05 - 09:46:05 8458
Wenatchee 09:31:05 -16.4 AT Down 42.0 187.2 Up 09:16:05 - 09:46:05 8422
Ellensburg 09:31:05 -16.9 AT Down 42.4 186.9 Up 09:16:05 - 09:46:05 8390
Yakima 09:31:05 -17.3 AT Down 42.8 187.0 Up 09:16:05 - 09:46:05 8360
Toppenish/White Swan 09:31:05 -17.4 AT Down 43.0 187.2 Up 09:16:05 - 09:46:05 8344
PNWRO 09:30:59 -17.4 AT Down 43.2 189.3 Up 09:15:59 - 09:45:59 8322
The Dalles 09:31:07 -18.3 Dark Down 43.9 186.2 Up 09:16:07 - 09:46:07 8281
Maupin 09:31:07 -18.7 Dark Down 44.3 186.4 Up 09:16:07 - 09:46:07 8249
Sisters 09:31:08 -19.7 Dark Down 45.2 185.8 Up 09:16:08 - 09:46:08 8179
Bend 09:31:07 -19.8 Dark Down 45.4 186.2 Up 09:16:07 - 09:46:07 8161
Oregon Observatory 09:31:07 -20.0 Dark Down 45.6 186.0 Up 09:16:07 - 09:46:07 8147
Chiloquin 09:31:08 -21.3 Dark Down 46.9 185.6 Up 09:16:08 - 09:46:08 8040
Klamath Falls 09:31:08 -21.6 Dark Down 47.3 185.7 Up 09:16:08 - 09:46:08 8012
Cedarville 09:31:01 -21.9 Dark Down 47.8 188.2 Up 09:16:01 - 09:46:01 7963
Dunrhomin 09:30:04 -17.6 AT Down 45.4 209.5 Up 09:15:04 - 09:45:04 7922
Fall River/Burney 09:31:06 -22.7 Dark Down 48.4 186.4 Up 09:16:06 - 09:46:06 7917
Nikitin 09:30:03 -17.8 AT Down 45.5 209.6 Up 09:15:03 - 09:45:03 7907
CU-SBO 09:30:04 -17.9 AT Down 45.6 209.5 Up 09:15:04 - 09:45:04 7901
Gimple 09:31:04 -23.4 Dark Down 49.3 187.3 Up 09:16:04 - 09:46:04 7844
Greenville 09:31:04 -23.4 Dark Down 49.3 187.2 Up 09:16:04 - 09:46:04 7843
Quincy 09:31:04 -23.6 Dark Down 49.5 187.3 Up 09:16:04 - 09:46:04 7826
Portola 09:31:02 -23.5 Dark Down 49.5 188.0 Up 09:16:02 - 09:46:02 7818
Reno 09:30:59 -23.6 Dark Down 49.7 189.0 Up 09:15:59 - 09:45:59 7799
Carson City 09:30:58 -23.9 Dark Down 50.1 189.1 Up 09:15:58 - 09:45:58 7768
Yerington 09:30:56 -23.9 Dark Down 50.2 190.1 Up 09:15:56 - 09:45:56 7754
Gardnerville 09:30:59 -24.1 Dark Down 50.3 189.2 Up 09:15:59 - 09:45:59 7748
Hawthorne 09:30:54 -24.2 Dark Down 50.6 191.0 Up 09:15:54 - 09:45:54 7717
Lee Vining 09:30:55 -24.9 Dark Down 51.2 190.4 Up 09:15:55 - 09:45:55 7666
Bishop 09:30:52 -25.2 Dark Down 51.7 191.7 Up 09:15:52 - 09:45:52 7617
Beatty 09:30:45 -25.1 Dark Down 51.8 194.4 Up 09:15:45 - 09:45:45 7584
Patrick 09:30:33 -25.3 Dark Down 52.6 199.4 Up 09:15:33 - 09:45:33 7466
Laughlin/Bullhead City 09:30:35 -25.8 Dark Down 53.0 198.4 Up 09:15:35 - 09:45:35 7441
Lake Havasu City 09:30:34 -26.3 Dark Down 53.6 199.1 Up 09:15:34 - 09:45:34 7381
Wildwood 09:30:51 -28.2 Dark Down 54.9 192.2 Up 09:15:51 - 09:45:51 7324
George/Scottsdale 09:30:23 -26.0 Dark Down 53.6 203.4 Up 09:15:23 - 09:45:23 7323
Idyllwild 09:30:43 -27.9 Dark Down 54.9 195.5 Up 09:15:43 - 09:45:43 7302
Calipatria 09:30:38 -28.0 Dark Down 55.2 197.8 Up 09:15:38 - 09:45:38 7251
Yuma 09:30:33 -28.0 Dark Down 55.4 199.4 Up 09:15:33 - 09:45:33 7215

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 523686, (2026/06/21 09:31UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 45.95  76
Tarazed        19:46:15.6 +10:36:48  2.7 14.73 122
PPM 180573     19:09:51.6 -00:25:41  6.5  0.76 114
PPM 180540     19:05:15.6 -00:56:08  6.9  0.68 113
PPM 180558     19:07:10.9 -00:39:56  9.7  0.30 113
523686         19:06:49.7 -00:22:39 15.8       113
Positions are for J2000

Event circumstances last updated at 2024/06/19 21:29:30 UT

Marc W. Buie, Southwest Research Institute

RECON