RECON: TNO occultation with 308460

Event between (308460) 05SC278 and star GA1040:00229386 with event index number of 2185926

Geocentric closest approach at 2025/10/16 04:16:58 UTC

J2000 position of star is 02:24:53.0 +14:40:31
Equinox of date position of star is 02:26:06.1 +14:46:31
Stellar brightness G=12.2, use SENSEUP=16 with the MallinCam and and exposure time of 250 milli-seconds with the QHY174 camera.
Star is 104 degrees from the moon. Moon is 25% illuminated.
TNO apparent brightness V=22.5

[RECON map]
TNO is 33.0 AU from the Sun and 32.0 AU from the Earth.
The TNO is moving 23.5 km/sec on the sky relative to the star, or, 3.6 arcsec/hr.
The 1-sigma error in the time of the event is 145 seconds.
The 1-sigma cross-track error in the shadow position is 1880 km.
The sky-plane scale is 23243.8 km/arcsec.

The TNO has an absolute magnitude Hv=7.3
Diameter=208.9 km assuming a 5% albedo -- 8.9 sec chord
Diameter=85.3 km assuming a 30% albedo -- 3.6 sec chord
Dynamical classification is 5:4E
 
 
 
 
 
 

Star training set for 308460, (2025/10/16 04:17UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:24.2 +16:33:33  0.8 31.57  73
6Bet Ari       01:56:04.2 +20:55:59  2.6  9.45 108
29 Ari         02:34:19.2 +15:08:50  6.0  1.97 102
PPM 118192     02:25:52.2 +15:38:25  7.9  0.86 104
PPM 118201     02:26:15.0 +14:47:04  9.7  0.01 104
308460         02:26:17.6 +14:47:27 12.2       104
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 16.5 km RECON observability=1.0 and success probability=12.6%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kamloops 04:18:32 -30.3 Dark Down 25.8 98.4 Low 04:05:56 - 04:31:07 3192
Victoria 04:18:43 -29.4 Dark Down 24.1 95.0 Low 04:06:08 - 04:31:19 3160
Peachland 04:18:35 -31.1 Dark Down 26.3 98.5 Low 04:05:59 - 04:31:10 3132
Kelowna 04:18:34 -31.2 Dark Down 26.5 98.8 Low 04:05:59 - 04:31:10 3130
Summerland 04:18:36 -31.2 Dark Down 26.4 98.5 Low 04:06:00 - 04:31:11 3122
Penticton 04:18:36 -31.3 Dark Down 26.5 98.5 Low 04:06:00 - 04:31:11 3116
Oliver 04:18:37 -31.4 Dark Down 26.6 98.4 Low 04:06:01 - 04:31:12 3098
Anarchist Mountain Observatory 04:18:38 -31.6 Dark Down 26.7 98.4 Low 04:06:02 - 04:31:13 3085
Tonasket 04:18:39 -31.7 Dark Down 26.7 98.2 Low 04:06:04 - 04:31:15 3070
Okanogan 04:18:40 -31.8 Dark Down 26.7 97.9 Low 04:06:05 - 04:31:16 3056
Brewster 04:18:42 -31.8 Dark Down 26.6 97.7 Low 04:06:06 - 04:31:17 3047
Manson/Chelan 04:18:43 -31.6 Dark Down 26.4 97.3 Low 04:06:07 - 04:31:18 3046
Wenatchee 04:18:45 -31.7 Dark Down 26.3 96.9 Low 04:06:10 - 04:31:21 3025
Ellensburg 04:18:47 -31.8 Dark Down 26.2 96.5 Low 04:06:12 - 04:31:23 3008
Yakima 04:18:49 -31.9 Dark Down 26.3 96.3 Low 04:06:13 - 04:31:24 2986
Toppenish/White Swan 04:18:49 -32.1 Dark Down 26.4 96.4 Low 04:06:14 - 04:31:25 2970
Goldendale 04:18:52 -32.1 Dark Down 26.2 95.8 Low 04:06:17 - 04:31:28 2951
The Dalles 04:18:53 -31.9 Dark Down 25.9 95.4 Low 04:06:18 - 04:31:29 2948
Maupin 04:18:55 -32.1 Dark Down 26.1 95.3 Low 04:06:19 - 04:31:30 2921
PNWRO 04:18:49 -33.2 Dark Down 27.5 97.3 Low 04:06:14 - 04:31:25 2910
Sleaford 04:18:07 -37.1 Dark Down 34.1 111.8 Up 04:05:32 - 04:30:43 2900
Sisters 04:18:59 -32.1 Dark Down 25.8 94.5 Low 04:06:23 - 04:31:34 2885
Bend 04:19:00 -32.4 Dark Down 26.0 94.6 Low 04:06:24 - 04:31:35 2864
Oregon Observatory 04:19:01 -32.4 Dark Down 25.9 94.4 Low 04:06:25 - 04:31:36 2857
North Lake 04:19:02 -33.0 Dark Down 26.4 94.5 Low 04:06:27 - 04:31:38 2805
Chiloquin 04:19:06 -32.6 Dark Down 25.7 93.5 Low 04:06:30 - 04:31:41 2791
Klamath Falls 04:19:08 -32.7 Dark Down 25.8 93.4 Low 04:06:32 - 04:31:43 2768
Lakeview 04:19:06 -33.7 Dark Down 26.9 94.3 Low 04:06:30 - 04:31:41 2725
Fall River/Burney 04:19:11 -33.4 Dark Down 26.2 93.1 Low 04:06:36 - 04:31:47 2684
Cedarville 04:19:08 -34.1 Dark Down 27.1 94.1 Low 04:06:33 - 04:31:44 2679
Susanville 04:19:14 -34.2 Dark Down 26.8 93.3 Low 04:06:38 - 04:31:49 2622
Greenville 04:19:14 -34.0 Dark Down 26.6 92.9 Low 04:06:39 - 04:31:50 2613
Gimple 04:19:14 -34.1 Dark Down 26.6 93.0 Low 04:06:39 - 04:31:50 2610
Quincy 04:19:15 -34.1 Dark Down 26.6 92.8 Low 04:06:40 - 04:31:51 2600
Portola 04:19:15 -34.5 Dark Down 27.0 93.1 Low 04:06:40 - 04:31:51 2578
Reno 04:19:16 -35.1 Dark Down 27.5 93.4 Low 04:06:40 - 04:31:51 2541
Carson City 04:19:17 -35.2 Dark Down 27.5 93.2 Low 04:06:41 - 04:31:52 2517
Gardnerville 04:19:18 -35.3 Dark Down 27.6 93.1 Low 04:06:42 - 04:31:53 2499
Yerington 04:19:17 -35.7 Dark Down 28.0 93.5 Low 04:06:42 - 04:31:53 2485
Hawthorne 04:19:18 -36.3 Dark Down 28.5 93.6 Low 04:06:43 - 04:31:54 2438
Lee Vining 04:19:21 -36.1 Dark Down 28.1 93.0 Low 04:06:46 - 04:31:57 2415
Tonopah 04:19:18 -37.5 Dark Down 29.6 94.3 Low 04:06:43 - 04:31:54 2363
Bishop 04:19:22 -36.9 Dark Down 28.7 93.2 Low 04:06:47 - 04:31:58 2351
Beatty 04:19:22 -38.2 Dark Down 30.1 93.9 Up 04:06:46 - 04:31:57 2267
Indian Springs 04:19:22 -39.2 Dark Down 31.0 94.4 Up 04:06:46 - 04:31:57 2210
Henderson 04:19:22 -39.9 Dark Down 31.6 94.5 Up 04:06:47 - 04:31:58 2149
Dunrhomin 04:18:51 -44.7 Dark Down 38.4 104.3 Up 04:06:16 - 04:31:27 2133
Wildwood 04:19:34 -37.7 Dark Down 28.7 91.3 Low 04:06:59 - 04:32:10 2123
CU-SBO 04:18:52 -44.8 Dark Down 38.4 104.1 Up 04:06:17 - 04:31:28 2118
Laughlin/Bullhead City 04:19:25 -40.5 Dark Down 32.0 94.3 Up 04:06:49 - 04:32:00 2071
Patrick 04:19:23 -41.0 Dark Down 32.5 94.9 Up 04:06:47 - 04:31:58 2066
Kingman/Dolan Springs 04:19:24 -40.9 Dark Down 32.4 94.6 Up 04:06:49 - 04:32:00 2056
Mohave Valley 04:19:26 -40.6 Dark Down 32.0 94.1 Up 04:06:50 - 04:32:01 2051
Idyllwild 04:19:33 -39.3 Dark Down 30.3 92.1 Up 04:06:57 - 04:32:08 2036
Lake Havasu City 04:19:27 -40.9 Dark Down 32.2 94.0 Up 04:06:51 - 04:32:02 2013
Parker 04:19:28 -41.1 Dark Down 32.3 93.8 Up 04:06:52 - 04:32:03 1986
Calipatria 04:19:33 -40.5 Dark Down 31.3 92.5 Up 04:06:58 - 04:32:09 1950
Yuma 04:19:34 -41.3 Dark Down 32.1 92.7 Up 04:06:58 - 04:32:09 1887
George/Scottsdale 04:19:25 -43.1 Dark Down 34.3 95.0 Up 04:06:50 - 04:32:01 1871

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 308460, (2025/10/16 04:17UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 31.57  73
6Bet Ari       01:54:38.5 +20:48:26  2.6  9.45 108
29 Ari         02:32:54.1 +15:02:05  6.0  1.97 102
PPM 118192     02:24:27.2 +15:31:29  7.9  0.86 104
PPM 118201     02:24:50.3 +14:40:08  9.7  0.01 104
308460         02:24:53.0 +14:40:31 12.2       104
Positions are for J2000

Event circumstances last updated at 2022/04/10 23:06:59 UT

Marc W. Buie, Southwest Research Institute

RECON