RECON: TNO occultation with 505624

Event between (505624) 14GU53 and star GA0900:04945067 with event index number of 2451480

Geocentric closest approach at 2026/05/20 07:16:05 UTC

J2000 position of star is 17:00:51.2 +00:44:50
Equinox of date position of star is 17:01:59.5 +00:42:57
Stellar brightness G=13.9, use SENSEUP=64 with the MallinCam and and exposure time of 1 seconds with the QHY174 camera.
Star is 137 degrees from the moon. Moon is 17% illuminated.
TNO apparent brightness V=21.7

[RECON map]
TNO is 37.4 AU from the Sun and 36.5 AU from the Earth.
The TNO is moving 23.5 km/sec on the sky relative to the star, or, 3.2 arcsec/hr.
The 1-sigma error in the time of the event is 105 seconds.
The 1-sigma cross-track error in the shadow position is 1520 km.
The sky-plane scale is 26500.4 km/arcsec.

The TNO has an absolute magnitude Hv=5.9
Diameter=398.1 km assuming a 5% albedo -- 16.9 sec chord
Diameter=162.5 km assuming a 30% albedo -- 6.9 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 505624, (2026/05/20 07:17UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:01.8 -26:29:17  0.9 28.22 142
60Bet Oph      17:44:46.6 +04:33:29  2.8 11.31 141
PPM 179990     17:06:53.9 -00:55:35  5.4  2.01 139
PPM 179983     17:05:02.6 -00:10:52  7.3  1.14 138
PPM 163395     17:02:34.7 +00:28:10 10.0  0.26 137
PPM 163391     17:02:27.0 +00:49:39 10.4  0.13 137
505624         17:02:11.9 +00:42:37 13.9       137
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 22.9 km RECON observability=1.0 and success probability=33.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 07:17:40 -17.8 AT Down 37.4 162.6 Up 07:08:23 - 07:26:56 1348
Kamloops 07:18:19 -18.8 Dark Up 34.7 145.1 Up 07:09:02 - 07:27:35 1003
Kelowna 07:18:17 -19.7 Dark Up 35.7 145.8 Up 07:09:01 - 07:27:34 953
Peachland 07:18:18 -19.8 Dark Up 35.7 145.4 Up 07:09:02 - 07:27:35 939
Summerland 07:18:18 -19.9 Dark Up 35.8 145.5 Up 07:09:01 - 07:27:34 928
Penticton 07:18:17 -20.0 Dark Up 35.9 145.6 Up 07:09:01 - 07:27:34 925
Oliver 07:18:18 -20.3 Dark Up 36.2 145.4 Up 07:09:01 - 07:27:34 896
Anarchist Mountain Observatory 07:18:17 -20.5 Dark Up 36.4 145.6 Up 07:09:01 - 07:27:34 886
Tonasket 07:18:18 -20.8 Dark Up 36.7 145.4 Up 07:09:02 - 07:27:35 859
Okanogan 07:18:19 -21.1 Dark Up 36.9 145.1 Up 07:09:02 - 07:27:35 829
Brewster 07:18:20 -21.4 Dark Up 37.0 144.7 Up 07:09:03 - 07:27:36 803
Manson/Chelan 07:18:21 -21.6 Dark Up 37.1 144.2 Up 07:09:04 - 07:27:37 780
Victoria 07:18:29 -20.5 Dark Up 35.3 140.8 Up 07:09:12 - 07:27:45 780
Wenatchee 07:18:21 -22.0 Dark Up 37.4 143.8 Up 07:09:05 - 07:27:38 738
Ellensburg 07:18:22 -22.4 Dark Up 37.6 143.4 Up 07:09:06 - 07:27:39 699
Yakima 07:18:23 -22.8 Dark Up 37.9 143.2 Up 07:09:06 - 07:27:39 665
Toppenish/White Swan 07:18:22 -23.0 Dark Up 38.2 143.3 Up 07:09:06 - 07:27:39 649
PNWRO 07:18:19 -23.6 Dark Up 39.1 144.8 Up 07:09:02 - 07:27:35 644
Goldendale 07:18:24 -23.5 Dark Up 38.5 142.5 Up 07:09:07 - 07:27:40 595
The Dalles 07:18:25 -23.7 Dark Up 38.5 142.0 Up 07:09:09 - 07:27:42 569
Maupin 07:18:25 -24.1 Dark Up 38.9 141.9 Up 07:09:09 - 07:27:42 535
Sisters 07:18:27 -24.9 Dark Up 39.3 140.9 Up 07:09:10 - 07:27:43 450
Bend 07:18:26 -25.2 Dark Up 39.6 141.1 Up 07:09:10 - 07:27:43 434
Oregon Observatory 07:18:27 -25.3 Dark Up 39.7 140.8 Up 07:09:11 - 07:27:44 416
Dunrhomin 07:17:37 -29.6 Dark Down 48.8 160.0 Up 07:08:20 - 07:26:53 416
CU-SBO 07:17:37 -29.8 Dark Down 49.0 159.8 Up 07:08:21 - 07:26:54 392
North Lake 07:18:26 -26.0 Dark Up 40.5 141.1 Up 07:09:09 - 07:27:42 370
Chiloquin 07:18:29 -26.6 Dark Up 40.5 139.6 Up 07:09:13 - 07:27:46 292
Lakeview 07:18:25 -27.1 Dark Down 41.5 141.2 Up 07:09:08 - 07:27:41 286
Klamath Falls 07:18:29 -26.9 Dark Up 40.8 139.5 Up 07:09:13 - 07:27:46 263
Cedarville 07:18:25 -27.8 Dark Down 42.1 141.0 Up 07:09:08 - 07:27:41 230
Fall River/Burney 07:18:29 -28.1 Dark Down 41.9 139.3 Up 07:09:12 - 07:27:45 163
Susanville 07:18:27 -28.8 Dark Down 42.8 139.8 Up 07:09:10 - 07:27:43 120
Gimple 07:18:27 -29.1 Dark Down 42.9 139.4 Up 07:09:11 - 07:27:44 90
Greenville 07:18:28 -29.1 Dark Down 42.8 139.3 Up 07:09:11 - 07:27:44 89
Quincy 07:18:28 -29.3 Dark Down 43.0 139.2 Up 07:09:11 - 07:27:44 70
Portola 07:18:26 -29.5 Dark Down 43.3 139.7 Up 07:09:10 - 07:27:43 68
Reno 07:18:24 -29.8 Dark Down 43.8 140.3 Up 07:09:08 - 07:27:41 56
Carson City 07:18:24 -30.2 Dark Down 44.1 140.1 Up 07:09:08 - 07:27:41 23
Yerington 07:18:23 -30.4 Dark Down 44.6 140.7 Up 07:09:06 - 07:27:39 17
Gardnerville 07:18:24 -30.4 Dark Down 44.3 140.0 Up 07:09:08 - 07:27:41 2
Hawthorne 07:18:21 -31.0 Dark Down 45.2 141.1 Up 07:09:05 - 07:27:38 -15
Tonopah 07:18:17 -31.6 Dark Down 46.2 142.5 Up 07:09:00 - 07:27:33 -30
Lee Vining 07:18:23 -31.5 Dark Down 45.4 140.1 Up 07:09:06 - 07:27:39 -77
Bishop 07:18:21 -32.2 Dark Down 46.2 140.6 Up 07:09:04 - 07:27:37 -119
Patrick 07:18:03 -34.5 Dark Down 49.9 145.1 Up 07:08:46 - 07:27:19 -220
Henderson 07:18:03 -33.8 Dark Down 48.9 144.0 Up 07:08:46 - 07:27:19 -235
Kingman/Dolan Springs 07:18:03 -34.7 Dark Down 50.0 144.7 Up 07:08:46 - 07:27:19 -249
Indian Springs 07:18:03 -33.2 Dark Down 48.1 143.5 Up 07:08:46 - 07:27:19 -254
Laughlin/Bullhead City 07:18:03 -34.7 Dark Down 49.8 144.0 Up 07:08:46 - 07:27:19 -278
Mohave Valley 07:18:03 -35.0 Dark Down 50.0 143.8 Up 07:08:46 - 07:27:19 -301
Lake Havasu City 07:18:03 -35.4 Dark Down 50.5 143.9 Up 07:08:46 - 07:27:19 -324
Beatty 07:18:03 -32.8 Dark Down 47.3 142.3 Up 07:08:46 - 07:27:19 -325
George/Scottsdale 07:17:59 -36.3 Dark Down 52.3 146.8 Up 07:08:42 - 07:27:15 -326
Parker 07:18:03 -35.7 Dark Down 50.8 143.6 Up 07:08:46 - 07:27:19 -354
Wildwood 07:18:22 -35.4 Dark Down 48.6 138.0 Up 07:09:05 - 07:27:38 -434
Yuma 07:18:03 -37.2 Dark Down 51.7 142.1 Up 07:08:46 - 07:27:19 -502
Calipatria 07:18:03 -36.6 Dark Down 50.9 141.2 Up 07:08:46 - 07:27:19 -506
Idyllwild 07:18:03 -35.9 Dark Down 49.8 140.1 Up 07:08:46 - 07:27:19 -525

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 505624, (2026/05/20 07:17UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 28.22 142
60Bet Oph      17:43:28.3 +04:34:06  2.8 11.31 141
PPM 179990     17:05:32.2 -00:53:32  5.4  2.01 139
PPM 179983     17:03:41.4 -00:08:45  7.3  1.14 138
PPM 163395     17:01:13.9 +00:30:23 10.0  0.26 137
PPM 163391     17:01:06.4 +00:51:52 10.4  0.13 137
505624         17:00:51.2 +00:44:50 13.9       137
Positions are for J2000

Event circumstances last updated at 2022/05/04 23:35:03 UT

Marc W. Buie, Southwest Research Institute

RECON