RECON: TNO occultation with 248835

Event between (248835) 06SX368 and star GA1120:02353355 with event index number of 2298840

Geocentric closest approach at 2025/12/26 08:31:05 UTC

J2000 position of star is 06:40:19.3 +23:55:13
Equinox of date position of star is 06:41:40.8 +23:53:54
Stellar brightness G=15.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 112 degrees from the moon. Moon is 35% illuminated.
TNO apparent brightness V=22.5

[RECON map]
TNO is 20.3 AU from the Sun and 19.4 AU from the Earth.
The TNO is moving 25.5 km/sec on the sky relative to the star, or, 6.5 arcsec/hr.
The 1-sigma error in the time of the event is 270 seconds.
The 1-sigma cross-track error in the shadow position is 5830 km.
The sky-plane scale is 14036.1 km/arcsec.

The TNO has an absolute magnitude Hv=9.5
Diameter=75.9 km assuming a 5% albedo -- 3.0 sec chord
Diameter=31.0 km assuming a 30% albedo -- 1.2 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 248835, (2025/12/26 08:31UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:54.3 +27:57:41  1.1 15.16 126
Alhena         06:39:12.8 +16:22:30  1.9  7.55 112
PPM 096264     06:39:02.8 +24:34:01  6.5  0.94 112
PPM 096281     06:39:27.3 +23:34:49  7.7  0.64 112
PPM 096343     06:41:46.4 +23:48:52  9.8  0.09 112
248835         06:41:54.4 +23:53:40 15.6       113
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 3.3 sigma about the mid-time.
The median site spacing is 33.0 km RECON observability=1.0 and success probability=8.9%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 08:30:14 -56.9 Dark Down 59.1 210.7 Up 08:15:14 - 08:45:14 4806
Kamloops 08:30:52 -62.1 Dark Down 63.2 184.8 Up 08:15:52 - 08:45:52 4670
Kelowna 08:30:50 -62.7 Dark Down 63.9 186.8 Up 08:15:50 - 08:45:50 4586
Peachland 08:30:50 -62.9 Dark Down 64.1 186.2 Up 08:15:50 - 08:45:50 4576
Summerland 08:30:51 -63.0 Dark Down 64.2 186.4 Up 08:15:51 - 08:45:51 4560
Penticton 08:30:50 -63.1 Dark Down 64.3 186.7 Up 08:15:50 - 08:45:50 4553
Oliver 08:30:50 -63.4 Dark Down 64.6 186.8 Up 08:15:50 - 08:45:50 4518
Anarchist Mountain Observatory 08:30:49 -63.5 Dark Down 64.8 187.2 Up 08:15:49 - 08:45:49 4500
Tonasket 08:30:49 -63.8 Dark Down 65.1 187.1 Up 08:15:49 - 08:45:49 4469
Victoria 08:31:01 -64.6 Dark Down 65.4 178.6 Up 08:16:01 - 08:46:01 4469
Okanogan 08:30:50 -64.2 Dark Down 65.4 186.9 Up 08:15:50 - 08:45:50 4436
Brewster 08:30:51 -64.5 Dark Down 65.7 186.5 Up 08:15:51 - 08:45:51 4409
Manson/Chelan 08:30:52 -64.8 Dark Down 65.9 185.8 Up 08:15:52 - 08:45:52 4389
Wenatchee 08:30:53 -65.3 Dark Down 66.4 185.5 Up 08:15:53 - 08:45:53 4342
Ellensburg 08:30:53 -65.7 Dark Down 66.9 185.1 Up 08:15:53 - 08:45:53 4300
Yakima 08:30:53 -66.1 Dark Down 67.3 185.1 Up 08:15:53 - 08:45:53 4259
Toppenish/White Swan 08:30:53 -66.3 Dark Down 67.5 185.6 Up 08:15:53 - 08:45:53 4236
PNWRO 08:30:48 -66.3 Dark Down 67.7 189.2 Up 08:15:48 - 08:45:48 4192
Goldendale 08:30:54 -66.9 Dark Down 68.0 184.7 Up 08:15:54 - 08:45:54 4181
The Dalles 08:30:56 -67.2 Dark Down 68.3 183.9 Up 08:15:56 - 08:45:56 4159
Maupin 08:30:55 -67.5 Dark Down 68.7 184.2 Up 08:15:55 - 08:45:55 4116
Sisters 08:30:57 -68.5 Dark Down 69.6 183.1 Up 08:15:57 - 08:45:57 4027
Bend 08:30:56 -68.7 Dark Down 69.8 183.8 Up 08:15:56 - 08:45:56 4001
Oregon Observatory 08:30:56 -68.9 Dark Down 70.0 183.5 Up 08:15:56 - 08:45:56 3983
North Lake 08:30:55 -69.4 Dark Down 70.6 185.1 Up 08:15:55 - 08:45:55 3914
Chiloquin 08:30:58 -70.2 Dark Down 71.3 182.6 Up 08:15:58 - 08:45:58 3848
Klamath Falls 08:30:58 -70.5 Dark Down 71.7 182.8 Up 08:15:58 - 08:45:58 3811
Lakeview 08:30:53 -70.2 Dark Down 71.6 186.9 Up 08:15:53 - 08:45:53 3800
Cedarville 08:30:53 -70.8 Dark Down 72.3 187.7 Up 08:15:53 - 08:45:53 3730
Fall River/Burney 08:30:57 -71.6 Dark Down 72.8 184.2 Up 08:15:57 - 08:45:57 3685
Susanville 08:30:55 -72.0 Dark Down 73.4 186.7 Up 08:15:55 - 08:45:55 3614
Dunrhomin 08:30:04 -64.8 Dark Down 68.1 227.0 Up 08:15:04 - 08:45:04 3594
Greenville 08:30:56 -72.3 Dark Down 73.7 185.9 Up 08:15:56 - 08:45:56 3586
Gimple 08:30:56 -72.3 Dark Down 73.7 186.1 Up 08:15:56 - 08:45:56 3585
CU-SBO 08:30:05 -65.0 Dark Down 68.3 227.3 Up 08:15:05 - 08:45:05 3567
Quincy 08:30:56 -72.5 Dark Down 73.9 186.0 Up 08:15:56 - 08:45:56 3564
Portola 08:30:54 -72.5 Dark Down 74.0 187.6 Up 08:15:54 - 08:45:54 3549
Reno 08:30:52 -72.5 Dark Down 74.2 189.8 Up 08:15:52 - 08:45:52 3517
Carson City 08:30:52 -72.8 Dark Down 74.5 190.1 Up 08:15:52 - 08:45:52 3479
Yerington 08:30:50 -72.8 Dark Down 74.6 192.4 Up 08:15:50 - 08:45:50 3455
Gardnerville 08:30:52 -73.1 Dark Down 74.8 190.4 Up 08:15:52 - 08:45:52 3453
Hawthorne 08:30:48 -73.0 Dark Down 75.0 194.6 Up 08:15:48 - 08:45:48 3404
Tonopah 08:30:44 -72.9 Dark Down 75.1 199.9 Up 08:15:44 - 08:45:44 3349
Lee Vining 08:30:50 -73.7 Dark Down 75.6 193.4 Up 08:15:50 - 08:45:50 3345
Bishop 08:30:48 -73.9 Dark Down 76.1 196.6 Up 08:15:48 - 08:45:48 3277
Beatty 08:30:42 -73.6 Dark Down 76.1 203.1 Up 08:15:42 - 08:45:42 3222
Indian Springs 08:30:39 -73.3 Dark Down 76.0 207.4 Up 08:15:39 - 08:45:39 3185
Henderson 08:30:36 -73.3 Dark Down 76.2 210.8 Up 08:15:36 - 08:45:36 3125
Patrick 08:30:32 -73.1 Dark Down 76.2 215.9 Up 08:15:32 - 08:45:32 3056
Kingman/Dolan Springs 08:30:33 -73.4 Dark Down 76.5 215.8 Up 08:15:33 - 08:45:33 3032
Laughlin/Bullhead City 08:30:34 -73.7 Dark Down 76.7 214.1 Up 08:15:34 - 08:45:34 3030
Mohave Valley 08:30:34 -73.9 Dark Down 77.0 214.8 Up 08:15:34 - 08:45:34 3000
Lake Havasu City 08:30:34 -74.0 Dark Down 77.2 216.7 Up 08:15:34 - 08:45:34 2956
Wildwood 08:30:49 -76.7 Dark Down 79.2 200.5 Up 08:15:49 - 08:45:49 2923
Parker 08:30:34 -74.2 Dark Down 77.4 217.7 Up 08:15:34 - 08:45:34 2918
Idyllwild 08:30:42 -75.9 Dark Down 78.9 209.6 Up 08:15:42 - 08:45:42 2878
George/Scottsdale 08:30:25 -72.8 Dark Down 76.4 226.7 Up 08:15:25 - 08:45:25 2870
Calipatria 08:30:38 -75.6 Dark Down 78.9 216.1 Up 08:15:38 - 08:45:38 2808
Yuma 08:30:35 -75.3 Dark Down 78.7 220.9 Up 08:15:35 - 08:45:35 2759

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 248835, (2025/12/26 08:31UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1 15.16 126
Alhena         06:37:42.8 +16:23:57  1.9  7.55 112
PPM 096264     06:37:27.2 +24:35:27  6.5  0.94 112
PPM 096281     06:37:52.4 +23:36:17  7.7  0.64 112
PPM 096343     06:40:11.5 +23:50:24  9.8  0.09 112
248835         06:40:19.3 +23:55:13 15.6       112
Positions are for J2000

Event circumstances last updated at 2022/04/12 23:06:25 UT

Marc W. Buie, Southwest Research Institute

RECON