RECON: TNO occultation with 468861

Event between (468861) 13LU28 and star GA1140:02607702 with event index number of 2655524

Geocentric closest approach at 2025/10/28 11:50:22 UTC

J2000 position of star is 06:55:32.6 +24:06:05
Equinox of date position of star is 06:56:54.6 +24:04:16
Stellar brightness G=15.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 171 degrees from the moon. Moon is 38% illuminated.
TNO apparent brightness V=18.4

[RECON map]
TNO is 9.2 AU from the Sun and 8.8 AU from the Earth.
The TNO is moving 22.4 km/sec on the sky relative to the star, or, 12.7 arcsec/hr.
The 1-sigma error in the time of the event is 63 seconds.
The 1-sigma cross-track error in the shadow position is 2879 km.
The sky-plane scale is 6350.5 km/arcsec.

The TNO has an absolute magnitude Hv=8.4
Diameter=128.2 km assuming a 5% albedo -- 5.7 sec chord
Diameter=52.4 km assuming a 30% albedo -- 2.3 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 468861, (2025/10/28 11:50UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:53.7 +27:57:42  1.1 11.84 177
Alhena         06:39:12.2 +16:22:30  1.9  8.76 163
37 Gem         06:56:53.8 +25:20:28  6.3  1.28 171
PPM 096747     06:57:11.5 +23:58:23  7.8  0.09 171
468861         06:57:07.0 +24:03:59 15.5       171
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 28.5 km RECON observability=1.0 and success probability=13.9%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kamloops 11:50:05 -28.4 Dark Down 62.4 160.7 Up 11:44:19 - 11:55:50 4012
Victoria 11:50:19 -30.8 Dark Down 63.6 153.3 Up 11:44:33 - 11:56:04 3922
Kelowna 11:50:04 -28.0 Dark Down 63.4 162.0 Up 11:44:18 - 11:55:49 3914
Peachland 11:50:06 -28.2 Dark Down 63.4 161.3 Up 11:44:20 - 11:55:51 3914
Summerland 11:50:05 -28.2 Dark Down 63.6 161.4 Up 11:44:20 - 11:55:51 3897
Penticton 11:50:06 -28.1 Dark Down 63.6 161.6 Up 11:44:20 - 11:55:51 3888
Oliver 11:50:06 -28.2 Dark Down 64.0 161.4 Up 11:44:21 - 11:55:52 3857
Anarchist Mountain Observatory 11:50:06 -28.1 Dark Down 64.2 161.6 Up 11:44:20 - 11:55:51 3836
Tonasket 11:50:07 -28.2 Dark Down 64.5 161.3 Up 11:44:21 - 11:55:52 3811
Okanogan 11:50:08 -28.4 Dark Down 64.7 160.8 Up 11:44:22 - 11:55:53 3786
Brewster 11:50:09 -28.6 Dark Down 65.0 160.2 Up 11:44:24 - 11:55:55 3768
Manson/Chelan 11:50:10 -28.9 Dark Down 65.1 159.2 Up 11:44:25 - 11:55:56 3761
Sleaford 11:49:21 -19.4 Dark Down 61.8 188.9 Up 11:43:36 - 11:55:07 3752
Wenatchee 11:50:12 -29.1 Dark Down 65.5 158.5 Up 11:44:27 - 11:55:58 3724
Ellensburg 11:50:14 -29.3 Dark Down 65.8 157.7 Up 11:44:28 - 11:55:59 3694
Yakima 11:50:14 -29.4 Dark Down 66.2 157.4 Up 11:44:29 - 11:56:00 3658
Toppenish/White Swan 11:50:15 -29.3 Dark Down 66.4 157.5 Up 11:44:29 - 11:56:00 3633
Goldendale 11:50:17 -29.7 Dark Down 66.8 156.1 Up 11:44:32 - 11:56:03 3598
The Dalles 11:50:19 -30.0 Dark Down 66.9 155.1 Up 11:44:33 - 11:56:04 3589
PNWRO 11:50:11 -28.4 Dark Down 67.1 160.5 Up 11:44:26 - 11:55:57 3551
Maupin 11:50:19 -30.0 Dark Down 67.3 154.9 Up 11:44:34 - 11:56:05 3548
Sisters 11:50:23 -30.5 Dark Down 68.0 152.9 Up 11:44:37 - 11:56:08 3485
Bend 11:50:23 -30.4 Dark Down 68.3 153.2 Up 11:44:37 - 11:56:08 3454
Oregon Observatory 11:50:24 -30.5 Dark Down 68.4 152.7 Up 11:44:38 - 11:56:09 3443
North Lake 11:50:23 -30.3 Dark Down 69.1 153.3 Up 11:44:38 - 11:56:09 3366
Chiloquin 11:50:28 -31.1 Dark Down 69.4 150.2 Up 11:44:43 - 11:56:14 3337
Klamath Falls 11:50:29 -31.1 Dark Down 69.7 149.9 Up 11:44:43 - 11:56:14 3303
Lakeview 11:50:24 -30.0 Dark Down 70.3 153.3 Up 11:44:38 - 11:56:09 3248
Cedarville 11:50:25 -30.0 Dark Down 70.9 153.0 Up 11:44:39 - 11:56:10 3181
Fall River/Burney 11:50:30 -31.0 Dark Down 70.9 149.2 Up 11:44:45 - 11:56:16 3179
Susanville 11:50:29 -30.5 Dark Down 71.7 150.2 Up 11:44:44 - 11:56:15 3093
Greenville 11:50:30 -30.8 Dark Down 71.8 149.0 Up 11:44:45 - 11:56:16 3078
Gimple 11:50:30 -30.7 Dark Down 71.9 149.2 Up 11:44:45 - 11:56:16 3075
Quincy 11:50:31 -30.8 Dark Down 72.0 148.7 Up 11:44:46 - 11:56:17 3059
Portola 11:50:30 -30.5 Dark Down 72.3 149.8 Up 11:44:44 - 11:56:15 3030
Reno 11:50:28 -30.0 Dark Down 72.8 151.1 Up 11:44:42 - 11:56:13 2981
Carson City 11:50:29 -30.1 Dark Down 73.1 150.6 Up 11:44:43 - 11:56:14 2946
Gardnerville 11:50:29 -30.0 Dark Down 73.3 150.4 Up 11:44:44 - 11:56:15 2921
Yerington 11:50:27 -29.6 Dark Down 73.5 152.1 Up 11:44:41 - 11:56:12 2904
Hawthorne 11:50:26 -29.2 Dark Down 74.1 153.0 Up 11:44:40 - 11:56:11 2840
Lee Vining 11:50:29 -29.7 Dark Down 74.4 150.6 Up 11:44:43 - 11:56:14 2804
Tonopah 11:50:22 -28.2 Dark Down 75.0 156.7 Up 11:44:37 - 11:56:08 2744
Bishop 11:50:28 -29.2 Dark Down 75.2 151.8 Up 11:44:42 - 11:56:13 2719
Beatty 11:50:23 -27.9 Dark Down 76.2 156.5 Up 11:44:37 - 11:56:08 2614
Dunrhomin 11:49:35 -18.9 Dark Down 73.2 197.4 Up 11:43:50 - 11:55:21 2575
CU-SBO 11:49:37 -19.0 Dark Down 73.5 197.4 Up 11:43:51 - 11:55:22 2552
Indian Springs 11:50:20 -27.1 Dark Down 76.8 160.0 Up 11:44:34 - 11:56:05 2544
Henderson 11:50:18 -26.6 Dark Down 77.5 161.9 Up 11:44:32 - 11:56:03 2466
Wildwood 11:50:35 -29.6 Dark Down 77.9 143.9 Up 11:44:50 - 11:56:21 2408
Laughlin/Bullhead City 11:50:19 -26.3 Dark Down 78.5 162.4 Up 11:44:33 - 11:56:04 2365
Patrick 11:50:16 -25.7 Dark Down 78.4 165.8 Up 11:44:30 - 11:56:01 2364
Kingman/Dolan Springs 11:50:17 -25.8 Dark Down 78.6 164.7 Up 11:44:31 - 11:56:02 2348
Mohave Valley 11:50:19 -26.3 Dark Down 78.7 162.0 Up 11:44:33 - 11:56:04 2337
Idyllwild 11:50:29 -28.0 Dark Down 79.1 150.3 Up 11:44:44 - 11:56:15 2301
Lake Havasu City 11:50:19 -26.1 Dark Down 79.2 162.5 Up 11:44:34 - 11:56:05 2288
Parker 11:50:20 -26.1 Dark Down 79.5 162.1 Up 11:44:34 - 11:56:05 2252
Calipatria 11:50:26 -27.1 Dark Down 80.1 154.2 Up 11:44:41 - 11:56:12 2195
George/Scottsdale 11:50:11 -24.1 Dark Down 80.3 174.0 Up 11:44:26 - 11:55:57 2123
Yuma 11:50:24 -26.4 Dark Down 80.8 157.6 Up 11:44:38 - 11:56:09 2119

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 468861, (2025/10/28 11:50UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1 11.84 177
Alhena         06:37:42.8 +16:23:57  1.9  8.76 163
37 Gem         06:55:18.6 +25:22:33  6.3  1.28 171
PPM 096747     06:55:37.2 +24:00:29  7.8  0.09 171
468861         06:55:32.6 +24:06:05 15.5       171
Positions are for J2000

Event circumstances last updated at 2022/06/07 22:32:23 UT

Marc W. Buie, Southwest Research Institute

RECON