RECON: TNO occultation with 523686

Event between (523686) 14DB143 and star GA0880:13901023 with event index number of 2623110

Geocentric closest approach at 2026/05/31 08:13:06 UTC

J2000 position of star is 19:09:36.7 -00:29:37
Equinox of date position of star is 19:10:45.5 -00:27:22
Stellar brightness G=15.1, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 47 degrees from the moon. Moon is 100% illuminated.
TNO apparent brightness V=22.3

[RECON map]
TNO is 20.4 AU from the Sun and 19.6 AU from the Earth.
The TNO is moving 17.7 km/sec on the sky relative to the star, or, 4.5 arcsec/hr.
The 1-sigma error in the time of the event is 218 seconds.
The 1-sigma cross-track error in the shadow position is 1651 km.
The sky-plane scale is 14250.2 km/arcsec.

The TNO has an absolute magnitude Hv=9.1
Diameter=91.2 km assuming a 5% albedo -- 5.2 sec chord
Diameter=37.2 km assuming a 30% albedo -- 2.1 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 523686, (2026/05/31 08:13UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:01.9 -26:29:18  0.9 46.43   0
Tarazed        19:47:30.9 +10:40:46  2.7 14.37  61
PPM 180573     19:11:13.1 -00:23:01  6.5  0.09  47
523686         19:10:58.2 -00:26:57 15.1        47
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 4.1 sigma about the mid-time.
The median site spacing is 24.2 km RECON observability=1.0 and success probability=16.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 08:15:45 -14.2 AT Up 34.7 154.8 Up 08:00:45 - 08:30:45 3317
Kamloops 08:16:33 -17.3 AT Up 30.9 138.3 Up 08:01:33 - 08:31:33 2948
Kelowna 08:16:31 -18.1 Dark Up 31.9 138.9 Up 08:01:31 - 08:31:31 2897
Peachland 08:16:33 -18.2 Dark Up 31.9 138.6 Up 08:01:33 - 08:31:33 2883
Summerland 08:16:32 -18.3 Dark Up 32.0 138.6 Up 08:01:32 - 08:31:32 2872
Penticton 08:16:32 -18.4 Dark Up 32.1 138.7 Up 08:01:32 - 08:31:32 2868
Oliver 08:16:33 -18.7 Dark Up 32.4 138.6 Up 08:01:33 - 08:31:33 2839
Anarchist Mountain Observatory 08:16:32 -18.9 Dark Up 32.6 138.7 Up 08:01:32 - 08:31:32 2829
Tonasket 08:16:32 -19.2 Dark Up 32.8 138.5 Up 08:01:32 - 08:31:32 2802
Okanogan 08:16:33 -19.5 Dark Up 33.0 138.2 Up 08:01:33 - 08:31:33 2771
Brewster 08:16:35 -19.8 Dark Up 33.1 137.9 Up 08:01:35 - 08:31:35 2744
Manson/Chelan 08:16:36 -20.1 Dark Up 33.1 137.4 Up 08:01:36 - 08:31:36 2720
Victoria 08:16:46 -19.5 Dark Up 31.1 134.3 Up 08:01:46 - 08:31:46 2716
Wenatchee 08:16:38 -20.5 Dark Up 33.4 137.0 Up 08:01:38 - 08:31:38 2677
Ellensburg 08:16:39 -21.0 Dark Up 33.6 136.6 Up 08:01:39 - 08:31:39 2637
Yakima 08:16:39 -21.4 Dark Up 33.8 136.4 Up 08:01:39 - 08:31:39 2602
Toppenish/White Swan 08:16:39 -21.6 Dark Up 34.1 136.5 Up 08:01:39 - 08:31:39 2587
PNWRO 08:16:35 -21.9 Dark Up 35.1 137.9 Up 08:01:35 - 08:31:35 2583
Goldendale 08:16:41 -22.2 Dark Up 34.3 135.8 Up 08:01:41 - 08:31:41 2531
The Dalles 08:16:43 -22.4 Dark Up 34.3 135.3 Up 08:01:43 - 08:31:43 2504
Maupin 08:16:43 -22.8 Dark Up 34.6 135.2 Up 08:01:43 - 08:31:43 2470
Sisters 08:16:45 -23.7 Dark Up 35.0 134.2 Up 08:01:45 - 08:31:45 2383
Dunrhomin 08:15:44 -25.2 Dark Up 45.4 151.2 Up 08:00:44 - 08:30:44 2374
Bend 08:16:45 -23.9 Dark Up 35.3 134.4 Up 08:01:45 - 08:31:45 2367
CU-SBO 08:15:45 -25.5 Dark Up 45.6 150.9 Up 08:00:45 - 08:30:45 2350
Oregon Observatory 08:16:46 -24.1 Dark Up 35.3 134.2 Up 08:01:46 - 08:31:46 2349
North Lake 08:16:44 -24.7 Dark Up 36.1 134.4 Up 08:01:44 - 08:31:44 2302
Chiloquin 08:16:48 -25.4 Dark Up 36.0 133.1 Up 08:01:48 - 08:31:48 2222
Lakeview 08:16:44 -25.7 Dark Up 37.1 134.4 Up 08:01:44 - 08:31:44 2217
Klamath Falls 08:16:48 -25.8 Dark Up 36.3 133.0 Up 08:01:48 - 08:31:48 2193
Cedarville 08:16:43 -26.4 Dark Up 37.7 134.3 Up 08:01:43 - 08:31:43 2161
Fall River/Burney 08:16:48 -26.9 Dark Up 37.3 132.7 Up 08:01:48 - 08:31:48 2092
Susanville 08:16:46 -27.5 Dark Up 38.2 133.1 Up 08:01:46 - 08:31:46 2049
Gimple 08:16:48 -27.8 Dark Up 38.2 132.8 Up 08:01:48 - 08:31:48 2019
Greenville 08:16:48 -27.8 Dark Up 38.2 132.7 Up 08:01:48 - 08:31:48 2017
Quincy 08:16:47 -28.0 Dark Up 38.3 132.5 Up 08:01:47 - 08:31:47 1998
Portola 08:16:46 -28.1 Dark Up 38.7 133.0 Up 08:01:46 - 08:31:46 1997
Reno 08:16:44 -28.3 Dark Up 39.2 133.5 Up 08:01:44 - 08:31:44 1985
Carson City 08:16:44 -28.7 Dark Up 39.5 133.3 Up 08:01:44 - 08:31:44 1952
Yerington 08:16:42 -28.8 Dark Up 40.0 133.9 Up 08:01:42 - 08:31:42 1947
Gardnerville 08:16:44 -28.9 Dark Up 39.7 133.2 Up 08:01:44 - 08:31:44 1930
Hawthorne 08:16:40 -29.3 Dark Up 40.6 134.2 Up 08:01:40 - 08:31:40 1915
Tonopah 08:16:35 -29.6 Dark Up 41.7 135.4 Up 08:01:35 - 08:31:35 1902
Lee Vining 08:16:42 -29.9 Dark Up 40.7 133.3 Up 08:01:42 - 08:31:42 1852
Bishop 08:16:39 -30.4 Dark Up 41.5 133.7 Up 08:01:39 - 08:31:39 1811
Beatty 08:16:33 -30.7 Dark Up 42.8 135.2 Up 08:01:33 - 08:31:33 1803
Indian Springs 08:16:29 -30.9 Dark Up 43.6 136.2 Up 08:01:29 - 08:31:29 1796
Henderson 08:16:26 -31.3 Dark Up 44.4 136.6 Up 08:01:26 - 08:31:26 1761
Patrick 08:16:22 -31.7 Dark Up 45.4 137.5 Up 08:01:22 - 08:31:22 1727
Kingman/Dolan Springs 08:16:23 -32.0 Dark Up 45.5 137.1 Up 08:01:23 - 08:31:23 1702
Laughlin/Bullhead City 08:16:25 -32.1 Dark Up 45.2 136.5 Up 08:01:25 - 08:31:25 1687
Mohave Valley 08:16:25 -32.4 Dark Up 45.4 136.3 Up 08:01:25 - 08:31:25 1661
Lake Havasu City 08:16:24 -32.7 Dark Up 45.8 136.3 Up 08:01:24 - 08:31:24 1629
George/Scottsdale 08:16:13 -33.0 Dark Up 47.8 138.7 Up 08:01:13 - 08:31:13 1613
Parker 08:16:24 -33.1 Dark Up 46.1 136.1 Up 08:01:24 - 08:31:24 1596
Idyllwild 08:16:34 -33.8 Dark Up 45.0 133.0 Up 08:01:34 - 08:31:34 1500
Wildwood 08:16:42 -33.7 Dark Up 43.6 131.2 Up 08:01:42 - 08:31:42 1492
Calipatria 08:16:29 -34.2 Dark Up 46.1 133.9 Up 08:01:29 - 08:31:29 1468
Yuma 08:16:26 -34.5 Dark Up 47.0 134.6 Up 08:01:26 - 08:31:26 1447

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, (2026/05/31 08:13UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 46.43   0
Tarazed        19:46:15.6 +10:36:48  2.7 14.37  61
PPM 180573     19:09:51.6 -00:25:41  6.5  0.09  47
523686         19:09:36.7 -00:29:37 15.1        47
Positions are for J2000

Event circumstances last updated at 2022/04/19 23:05:50 UT

Marc W. Buie, Southwest Research Institute

RECON