RECON: TNO occultation with 55638

Event between (55638) 02VE95 and star GA0960:02306197 with event index number of 2249836

Geocentric closest approach at 2023/12/31 04:42:28 UTC

J2000 position of star is 06:52:56.0 +06:03:12
Equinox of date position of star is 06:54:07.4 +06:01:29
Stellar brightness G=11.9, use SENSEUP=8 with the MallinCam and and exposure time of 125 milli-seconds with the QHY174 camera.
Star is 47 degrees from the moon. Moon is 84% illuminated.
TNO apparent brightness V=20.2

[RECON map]
TNO is 31.2 AU from the Sun and 30.2 AU from the Earth.
The TNO is moving 24.4 km/sec on the sky relative to the star, or, 4.0 arcsec/hr.
The 1-sigma error in the time of the event is 108 seconds.
The 1-sigma cross-track error in the shadow position is 1238 km.
The sky-plane scale is 21916.2 km/arcsec.

The TNO has an absolute magnitude Hv=5.3
Diameter=524.8 km assuming a 5% albedo -- 21.5 sec chord
Diameter=214.3 km assuming a 30% albedo -- 8.8 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 55638, (2023/12/31 04:42UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:28.3 +07:24:34  0.4 14.40  60
Alhena         06:39:05.9 +16:22:36  1.9 11.00  48
PPM 151677     07:00:37.9 +07:16:56  6.1  2.03  45
PPM 151373     06:52:16.4 +05:48:44  7.4  0.53  48
PPM 151447     06:54:11.9 +05:51:47  9.3  0.16  47
55638          06:54:13.1 +06:01:21 11.9        47
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 26.7 km RECON observability=1.0 and success probability=11.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 04:44:21 -50.3 Dark Up 34.1 131.4 Up 04:34:53 - 04:53:49 -1986
Kamloops 04:44:52 -42.8 Dark Up 27.4 116.5 Low 04:35:24 - 04:54:20 -2065
Kelowna 04:44:53 -43.6 Dark Up 28.3 116.9 Low 04:35:25 - 04:54:21 -2133
Peachland 04:44:53 -43.5 Dark Up 28.2 116.6 Low 04:35:25 - 04:54:21 -2141
Summerland 04:44:54 -43.6 Dark Up 28.3 116.6 Low 04:35:26 - 04:54:22 -2153
Penticton 04:44:54 -43.7 Dark Up 28.4 116.7 Low 04:35:26 - 04:54:22 -2159
Oliver 04:44:55 -43.8 Dark Up 28.6 116.5 Low 04:35:27 - 04:54:23 -2188
Anarchist Mountain Observatory 04:44:55 -43.9 Dark Up 28.8 116.6 Low 04:35:27 - 04:54:23 -2202
Tonasket 04:44:55 -44.0 Dark Up 28.9 116.4 Low 04:35:27 - 04:54:23 -2228
Victoria 04:45:03 -41.5 Dark Up 26.6 112.8 Low 04:35:35 - 04:54:31 -2228
Okanogan 04:44:57 -44.0 Dark Up 28.9 116.1 Low 04:35:29 - 04:54:25 -2255
Brewster 04:44:58 -43.9 Dark Up 28.9 115.8 Low 04:35:30 - 04:54:26 -2277
Manson/Chelan 04:44:59 -43.7 Dark Up 28.8 115.4 Low 04:35:31 - 04:54:27 -2293
Wenatchee 04:45:00 -43.7 Dark Up 28.9 115.0 Low 04:35:32 - 04:54:28 -2332
Ellensburg 04:45:02 -43.7 Dark Up 28.9 114.6 Low 04:35:34 - 04:54:30 -2366
Yakima 04:45:03 -43.8 Dark Up 29.1 114.4 Low 04:35:35 - 04:54:31 -2400
Toppenish/White Swan 04:45:03 -43.9 Dark Up 29.3 114.4 Low 04:35:35 - 04:54:31 -2419
PNWRO 04:45:01 -45.0 Dark Up 30.4 115.5 Up 04:35:33 - 04:54:29 -2456
Goldendale 04:45:05 -43.8 Dark Up 29.2 113.8 Low 04:35:37 - 04:54:33 -2465
The Dalles 04:45:06 -43.6 Dark Up 29.1 113.3 Low 04:35:38 - 04:54:34 -2483
Maupin 04:45:07 -43.7 Dark Up 29.3 113.2 Low 04:35:39 - 04:54:35 -2519
Sisters 04:45:10 -43.5 Dark Up 29.4 112.3 Low 04:35:42 - 04:54:38 -2594
Bend 04:45:10 -43.8 Dark Up 29.6 112.4 Low 04:35:42 - 04:54:38 -2616
Oregon Observatory 04:45:11 -43.7 Dark Up 29.6 112.2 Low 04:35:43 - 04:54:39 -2630
North Lake 04:45:11 -44.2 Dark Up 30.2 112.4 Up 04:35:43 - 04:54:39 -2689
Chiloquin 04:45:14 -43.6 Dark Up 29.8 111.2 Low 04:35:46 - 04:54:42 -2746
Klamath Falls 04:45:15 -43.7 Dark Up 30.0 111.1 Up 04:35:47 - 04:54:43 -2777
Lakeview 04:45:13 -44.8 Dark Up 31.0 112.2 Up 04:35:45 - 04:54:41 -2786
Cedarville 04:45:14 -45.0 Dark Up 31.4 112.0 Up 04:35:46 - 04:54:42 -2846
Fall River/Burney 04:45:17 -44.2 Dark Up 30.7 110.8 Up 04:35:49 - 04:54:45 -2885
Susanville 04:45:17 -44.8 Dark Up 31.5 111.0 Up 04:35:49 - 04:54:45 -2946
Greenville 04:45:18 -44.6 Dark Up 31.3 110.6 Up 04:35:50 - 04:54:46 -2970
Gimple 04:45:18 -44.7 Dark Up 31.4 110.7 Up 04:35:50 - 04:54:46 -2971
Quincy 04:45:19 -44.6 Dark Up 31.4 110.5 Up 04:35:51 - 04:54:47 -2989
Portola 04:45:18 -45.0 Dark Up 31.8 110.8 Up 04:35:50 - 04:54:46 -3002
Dunrhomin 04:44:40 -56.2 Dark Up 41.9 125.0 Up 04:35:12 - 04:54:08 -3003
CU-SBO 04:44:41 -56.2 Dark Up 41.9 124.7 Up 04:35:13 - 04:54:09 -3026
Reno 04:45:17 -45.5 Dark Up 32.4 111.2 Up 04:35:49 - 04:54:45 -3030
Carson City 04:45:18 -45.6 Dark Up 32.5 111.0 Up 04:35:50 - 04:54:46 -3063
Yerington 04:45:17 -46.1 Dark Up 33.0 111.4 Up 04:35:49 - 04:54:45 -3084
Gardnerville 04:45:18 -45.7 Dark Up 32.6 110.9 Up 04:35:50 - 04:54:46 -3086
Hawthorne 04:45:16 -46.6 Dark Up 33.6 111.5 Up 04:35:48 - 04:54:44 -3129
Tonopah 04:45:14 -47.7 Dark Up 34.8 112.4 Up 04:35:46 - 04:54:42 -3179
Lee Vining 04:45:19 -46.2 Dark Up 33.4 110.8 Up 04:35:51 - 04:54:47 -3181
Bishop 04:45:18 -46.9 Dark Up 34.2 111.0 Up 04:35:50 - 04:54:46 -3240
Beatty 04:45:15 -48.2 Dark Up 35.6 112.0 Up 04:35:47 - 04:54:43 -3291
Indian Springs 04:45:13 -49.1 Dark Up 36.5 112.7 Up 04:35:45 - 04:54:41 -3326
Henderson 04:45:13 -49.7 Dark Up 37.2 112.9 Up 04:35:45 - 04:54:41 -3380
Patrick 04:45:11 -50.7 Dark Up 38.3 113.4 Up 04:35:43 - 04:54:39 -3444
Kingman/Dolan Springs 04:45:11 -50.5 Dark Up 38.2 113.0 Up 04:35:43 - 04:54:39 -3465
Laughlin/Bullhead City 04:45:13 -50.1 Dark Up 37.9 112.6 Up 04:35:45 - 04:54:41 -3466
Mohave Valley 04:45:14 -50.2 Dark Up 38.0 112.4 Up 04:35:46 - 04:54:42 -3493
Lake Havasu City 04:45:14 -50.4 Dark Up 38.3 112.3 Up 04:35:46 - 04:54:42 -3533
Wildwood 04:45:25 -46.9 Dark Up 35.2 108.7 Up 04:35:57 - 04:54:53 -3556
Parker 04:45:14 -50.5 Dark Up 38.5 112.1 Up 04:35:46 - 04:54:42 -3567
Idyllwild 04:45:21 -48.5 Dark Up 36.8 109.9 Up 04:35:53 - 04:54:49 -3599
George/Scottsdale 04:45:08 -52.5 Dark Up 40.5 113.8 Up 04:35:40 - 04:54:36 -3617
Calipatria 04:45:19 -49.5 Dark Up 37.9 110.4 Up 04:35:51 - 04:54:47 -3664
Yuma 04:45:17 -50.3 Dark Up 38.7 110.8 Up 04:35:49 - 04:54:45 -3710

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 55638, (2023/12/31 04:42UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 14.40  60
Alhena         06:37:42.8 +16:23:57  1.9 11.00  48
PPM 151677     06:59:20.1 +07:19:00  6.1  2.03  45
PPM 151373     06:50:59.5 +05:50:32  7.4  0.53  48
PPM 151447     06:52:54.9 +05:53:38  9.3  0.16  47
55638          06:52:56.0 +06:03:12 11.9        47
Positions are for J2000

Event circumstances last updated at 2022/03/24 00:34:50 UT

Marc W. Buie, Southwest Research Institute

RECON