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 07:14:39 UTC

J2000 position of star is 17:00:51.2 +00:44:50
Equinox of date position of star is 17:02:03.4 +00:42:51
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.
Apparent brightness V=21.6

[RECON map]
Object is 37.4 AU from the Sun and 36.5 AU from the Earth.
Apparent velocity is 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 79 seconds.
The 1-sigma cross-track error in the shadow position is 1403 km.
The sky-plane scale is 26500.5 km/arcsec.

The object has an absolute magnitude Hv=5.8
Diameter=398.1 km assuming a 5% albedo -- 17.3 sec chord
Diameter=162.5 km assuming a 30% albedo -- 7.1 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 25.7 km RECON observability=1.0 and success probability=74.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 07:16:13 -17.8 AT Down 37.3 162.1 Up 07:09:09 - 07:23:18 1377
Kamloops 07:16:52 -18.7 Dark Up 34.6 144.7 Up 07:09:47 - 07:23:56 1032
Kelowna 07:16:51 -19.6 Dark Up 35.6 145.4 Up 07:09:46 - 07:23:55 981
Peachland 07:16:52 -19.7 Dark Up 35.6 145.0 Up 07:09:47 - 07:23:56 968
Summerland 07:16:51 -19.9 Dark Up 35.7 145.1 Up 07:09:46 - 07:23:55 957
Penticton 07:16:51 -20.0 Dark Up 35.8 145.2 Up 07:09:47 - 07:23:56 954
Oliver 07:16:51 -20.3 Dark Up 36.1 145.0 Up 07:09:47 - 07:23:56 925
Anarchist Mountain Observatory 07:16:51 -20.5 Dark Up 36.3 145.2 Up 07:09:46 - 07:23:55 914
Okanogan 07:16:52 -21.1 Dark Up 36.8 144.7 Up 07:09:48 - 07:23:57 858
Brewster 07:16:53 -21.4 Dark Up 36.9 144.3 Up 07:09:48 - 07:23:57 832
Manson/Chelan 07:16:54 -21.5 Dark Up 36.9 143.8 Up 07:09:49 - 07:23:58 809
Victoria 07:17:02 -20.5 Dark Up 35.1 140.4 Up 07:09:57 - 07:24:06 808
Wenatchee 07:16:55 -22.0 Dark Up 37.2 143.4 Up 07:09:50 - 07:23:59 766
Ellensburg 07:16:56 -22.3 Dark Up 37.5 143.0 Up 07:09:51 - 07:24:00 728
Yakima 07:16:56 -22.7 Dark Up 37.8 142.7 Up 07:09:52 - 07:24:01 693
Toppenish/White Swan 07:16:55 -23.0 Dark Up 38.0 142.8 Up 07:09:51 - 07:24:00 678
PNWRO 07:16:52 -23.5 Dark Up 38.9 144.4 Up 07:09:47 - 07:23:56 672
The Dalles 07:16:58 -23.6 Dark Up 38.3 141.6 Up 07:09:54 - 07:24:03 597
Maupin 07:16:59 -24.1 Dark Up 38.7 141.5 Up 07:09:54 - 07:24:03 563
Sisters 07:17:01 -24.9 Dark Up 39.2 140.5 Up 07:09:56 - 07:24:05 478
Bend 07:17:00 -25.1 Dark Up 39.5 140.6 Up 07:09:56 - 07:24:05 462
Oregon Observatory 07:17:00 -25.3 Dark Up 39.5 140.4 Up 07:09:56 - 07:24:05 445
Dunrhomin 07:16:11 -29.6 Dark Down 48.7 159.5 Up 07:09:06 - 07:23:15 443
Nikitin 07:16:11 -29.8 Dark Down 48.8 159.4 Up 07:09:06 - 07:23:15 427
CU-SBO 07:16:11 -29.8 Dark Down 48.9 159.3 Up 07:09:06 - 07:23:15 419
Chiloquin 07:17:03 -26.5 Dark Up 40.4 139.2 Up 07:09:58 - 07:24:07 320
Klamath Falls 07:17:03 -26.9 Dark Up 40.7 139.1 Up 07:09:58 - 07:24:07 291
Cedarville 07:16:58 -27.8 Dark Down 41.9 140.6 Up 07:09:53 - 07:24:02 258
Fall River/Burney 07:17:02 -28.1 Dark Down 41.7 138.9 Up 07:09:58 - 07:24:07 191
Gimple 07:17:01 -29.0 Dark Down 42.7 139.0 Up 07:09:56 - 07:24:05 118
Greenville 07:17:01 -29.0 Dark Down 42.6 138.9 Up 07:09:57 - 07:24:06 117
Quincy 07:17:01 -29.2 Dark Down 42.8 138.7 Up 07:09:57 - 07:24:06 98
Portola 07:17:00 -29.4 Dark Down 43.1 139.2 Up 07:09:55 - 07:24:04 96
Reno 07:16:58 -29.8 Dark Down 43.6 139.8 Up 07:09:53 - 07:24:02 83
Carson City 07:16:58 -30.1 Dark Down 43.9 139.6 Up 07:09:53 - 07:24:02 51
Yerington 07:16:56 -30.4 Dark Down 44.4 140.3 Up 07:09:52 - 07:24:01 45
Gardnerville 07:16:58 -30.4 Dark Down 44.1 139.5 Up 07:09:53 - 07:24:02 29
Hawthorne 07:16:55 -30.9 Dark Down 45.0 140.6 Up 07:09:50 - 07:23:59 12
Lee Vining 07:16:56 -31.4 Dark Down 45.2 139.7 Up 07:09:52 - 07:24:01 -50
Bishop 07:16:54 -32.1 Dark Down 46.0 140.2 Up 07:09:50 - 07:23:59 -91
Beatty 07:16:49 -32.7 Dark Down 47.2 141.9 Up 07:09:44 - 07:23:53 -102
Patrick 07:16:39 -34.5 Dark Down 49.8 144.6 Up 07:09:35 - 07:23:44 -182
Laughlin/Bullhead City 07:16:42 -34.7 Dark Down 49.6 143.5 Up 07:09:37 - 07:23:46 -220
Lake Havasu City 07:16:41 -35.4 Dark Down 50.3 143.4 Up 07:09:36 - 07:23:45 -279
George/Scottsdale 07:16:32 -36.3 Dark Down 52.1 146.2 Up 07:09:28 - 07:23:37 -299
Idyllwild 07:16:49 -35.9 Dark Down 49.7 139.7 Up 07:09:45 - 07:23:54 -402
Wildwood 07:16:56 -35.3 Dark Down 48.4 137.6 Up 07:09:51 - 07:24:00 -407
Calipatria 07:16:45 -36.6 Dark Down 50.8 140.8 Up 07:09:40 - 07:23:49 -436
Yuma 07:16:42 -37.1 Dark Down 51.6 141.6 Up 07:09:37 - 07:23:46 -459

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 2023/08/12 02:42:12 UT

Marc W. Buie, Southwest Research Institute

RECON