RECON: TNO occultation with 508869

Event between (508869) 02VT130 and star GA1140:01481355 with event index number of 1403479

Geocentric closest approach at 2025/03/02 07:37:00 UTC

J2000 position of star is 05:46:32.5 +24:28:29
Equinox of date position of star is 05:47:57.4 +24:28:55
Stellar brightness G=16.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 74 degrees from the moon. Moon is 7% illuminated.
Apparent brightness V=22.3

[RECON map]
Object is 43.3 AU from the Sun and 43.0 AU from the Earth.
Apparent velocity is 3.9 km/sec on the sky relative to the star, or, 0.4 arcsec/hr.
The 1-sigma error in the time of the event is 1027 seconds.
The 1-sigma cross-track error in the shadow position is 2319 km.
The sky-plane scale is 31197.3 km/arcsec.

The object has an absolute magnitude Hv=5.8
Diameter=436.5 km assuming a 5% albedo -- 104.8 sec chord
Diameter=178.2 km assuming a 30% albedo -- 42.8 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 508869, (2025/03/02 07:54UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:32.1 +07:24:35  0.4 17.19  76
Alnath         05:27:53.1 +28:37:35  1.6  6.13  69
132 Tau        05:50:33.7 +24:34:25  4.9  0.57  74
PPM 094824     05:47:29.1 +24:13:59  8.2  0.28  73
PPM 094870     05:48:48.2 +24:39:25  9.5  0.24  74
508869         05:48:05.2 +24:28:57 16.6        74
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 0.9 sigma about the mid-time.
The median site spacing is 27.6 km RECON observability=1.0 and success probability=19.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 07:17:59 -45.0 Dark Down 26.7 276.2 Low 07:02:59 - 07:32:59 -1383
Kamloops 07:19:17 -45.0 Dark Down 35.5 266.1 Up 07:04:17 - 07:34:17 -1826
Kelowna 07:18:57 -45.9 Dark Down 35.0 267.3 Up 07:03:57 - 07:33:57 -1885
Peachland 07:18:59 -45.9 Dark Down 35.2 267.2 Up 07:03:59 - 07:33:59 -1901
Summerland 07:18:53 -46.1 Dark Down 35.2 267.3 Up 07:03:53 - 07:33:53 -1913
Penticton 07:18:52 -46.2 Dark Down 35.1 267.5 Up 07:03:52 - 07:33:52 -1917
Oliver 07:18:46 -46.5 Dark Down 35.2 267.7 Up 07:03:46 - 07:33:46 -1951
Anarchist Mountain Observatory 07:18:44 -46.7 Dark Down 35.0 268.0 Up 07:03:44 - 07:33:44 -1963
Okanogan 07:18:38 -47.3 Dark Down 35.2 268.2 Up 07:03:38 - 07:33:38 -2029
Brewster 07:18:34 -47.5 Dark Down 35.4 268.2 Up 07:03:34 - 07:33:34 -2059
Manson/Chelan 07:18:35 -47.6 Dark Down 35.6 268.1 Up 07:03:35 - 07:33:35 -2086
Victoria 07:19:14 -46.2 Dark Down 37.7 265.3 Up 07:04:14 - 07:34:14 -2090
Wenatchee 07:18:30 -48.0 Dark Down 35.8 268.3 Up 07:03:30 - 07:33:30 -2136
Ellensburg 07:18:27 -48.3 Dark Down 35.9 268.4 Up 07:03:27 - 07:33:27 -2180
Yakima 07:18:22 -48.7 Dark Down 36.0 268.7 Up 07:03:22 - 07:33:22 -2220
Toppenish/White Swan 07:18:17 -48.9 Dark Down 35.9 269.0 Up 07:03:17 - 07:33:17 -2237
PNWRO 07:17:59 -49.6 Dark Down 34.9 270.3 Up 07:02:59 - 07:32:59 -2241
The Dalles 07:18:16 -49.5 Dark Down 36.5 269.0 Up 07:03:16 - 07:33:16 -2330
Maupin 07:18:09 -49.9 Dark Down 36.4 269.3 Up 07:03:09 - 07:33:09 -2369
Dunrhomin 07:14:55 -56.8 Dark Down 24.9 281.9 Low 06:59:55 - 07:29:55 -2442
Nikitin 07:14:53 -57.0 Dark Down 24.9 281.9 Low 06:59:53 - 07:29:53 -2460
Sisters 07:18:04 -50.5 Dark Down 36.8 269.6 Up 07:03:04 - 07:33:04 -2466
CU-SBO 07:14:53 -57.1 Dark Down 24.9 281.9 Low 06:59:53 - 07:29:53 -2469
Bend 07:17:57 -50.8 Dark Down 36.6 270.0 Up 07:02:57 - 07:32:57 -2484
Oregon Observatory 07:17:57 -50.9 Dark Down 36.7 270.0 Up 07:02:57 - 07:32:57 -2504
Chiloquin 07:17:46 -52.0 Dark Down 37.0 270.7 Up 07:02:46 - 07:32:46 -2645
Klamath Falls 07:17:41 -52.3 Dark Down 37.0 271.0 Up 07:02:41 - 07:32:41 -2677
Cedarville 07:17:13 -53.4 Dark Down 35.9 272.4 Up 07:02:13 - 07:32:13 -2712
Fall River/Burney 07:17:24 -53.5 Dark Down 36.7 272.1 Up 07:02:24 - 07:32:24 -2788
Gimple 07:17:05 -54.4 Dark Down 36.3 273.0 Up 07:02:05 - 07:32:05 -2868
Greenville 07:17:07 -54.4 Dark Down 36.4 273.0 Up 07:02:07 - 07:32:07 -2870
Quincy 07:17:04 -54.6 Dark Down 36.4 273.1 Up 07:02:04 - 07:32:04 -2891
Portola 07:17:01 -54.9 Dark Down 36.0 273.5 Up 07:02:01 - 07:32:01 -2892
Reno 07:16:49 -55.3 Dark Down 35.6 274.0 Up 07:01:49 - 07:31:49 -2904
Carson City 07:16:48 -55.6 Dark Down 35.5 274.3 Up 07:01:48 - 07:31:48 -2940
Yerington 07:16:36 -56.0 Dark Down 35.0 274.8 Up 07:01:36 - 07:31:36 -2945
Gardnerville 07:16:44 -55.9 Dark Down 35.5 274.5 Up 07:01:44 - 07:31:44 -2964
Hawthorne 07:16:26 -56.6 Dark Down 34.6 275.4 Up 07:01:26 - 07:31:26 -2980
Lee Vining 07:16:27 -56.9 Dark Down 34.9 275.5 Up 07:01:27 - 07:31:27 -3049
Bishop 07:16:13 -57.7 Dark Down 34.4 276.3 Up 07:01:13 - 07:31:13 -3093
Beatty 07:15:51 -58.6 Dark Down 33.1 277.4 Up 07:00:51 - 07:30:51 -3099
Patrick 07:15:07 -60.7 Dark Down 30.7 279.7 Up 07:00:07 - 07:30:07 -3174
Laughlin/Bullhead City 07:15:12 -60.8 Dark Down 31.2 279.5 Up 07:00:12 - 07:30:12 -3219
Lake Havasu City 07:15:03 -61.5 Dark Down 30.9 280.0 Up 07:00:03 - 07:30:03 -3281
George/Scottsdale 07:14:35 -62.7 Dark Down 28.9 281.6 Low 06:59:35 - 07:29:35 -3290
Idyllwild 07:15:20 -61.5 Dark Down 32.7 279.4 Up 07:00:20 - 07:30:20 -3424
Wildwood 07:15:45 -60.6 Dark Down 34.2 278.3 Up 07:00:45 - 07:30:45 -3436
Calipatria 07:15:03 -62.4 Dark Down 31.7 280.3 Up 07:00:03 - 07:30:03 -3455
Yuma 07:14:49 -63.1 Dark Down 30.9 280.9 Up 06:59:49 - 07:29:49 -3475

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 508869, (2025/03/02 07:54UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 17.19  76
Alnath         05:26:17.6 +28:36:23  1.6  6.13  69
132 Tau        05:49:00.9 +24:34:02  4.9  0.57  74
PPM 094824     05:45:56.6 +24:13:30  8.2  0.28  73
PPM 094870     05:47:15.4 +24:38:58  9.5  0.24  74
508869         05:46:32.5 +24:28:29 16.6        73
Positions are for J2000

Event circumstances last updated at 2023/01/19 03:24:55 UT

Marc W. Buie, Southwest Research Institute

RECON