RECON: TNO occultation with 55638

Event between (55638) 02VE95 and star GA0940:02218612 with event index number of 2250021

Geocentric closest approach at 2025/02/06 06:05:33 UTC

J2000 position of star is 06:58:14.4 +05:56:35
Equinox of date position of star is 06:59:25.9 +05:54:42
Stellar brightness G=15.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 50 degrees from the moon. Moon is 60% illuminated.
TNO apparent brightness V=20.3

[RECON map]
TNO is 31.4 AU from the Sun and 30.6 AU from the Earth.
The TNO is moving 20.5 km/sec on the sky relative to the star, or, 3.3 arcsec/hr.
The 1-sigma error in the time of the event is 135 seconds.
The 1-sigma cross-track error in the shadow position is 1487 km.
The sky-plane scale is 22221.4 km/arcsec.

The TNO has an absolute magnitude Hv=5.3
Diameter=524.8 km assuming a 5% albedo -- 25.7 sec chord
Diameter=214.3 km assuming a 30% albedo -- 10.5 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 55638, (2025/02/06 06:06UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:31.9 +07:24:35  0.4 15.73  35
Alhena         06:39:09.7 +16:22:33  1.9 11.60  41
PPM 151776     07:03:15.5 +05:31:10  6.4  0.99  51
PPM 151571     06:57:46.2 +05:58:11  7.6  0.45  49
PPM 151640     06:59:41.3 +05:52:23  9.2  0.04  50
55638          06:59:35.0 +05:54:27 15.9        50
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 21.7 km RECON observability=1.0 and success probability=15.6%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 06:05:49 -50.7 Dark Up 41.6 203.7 Up 05:54:07 - 06:17:32 3509
Kamloops 06:06:31 -46.3 Dark Up 45.2 184.7 Up 05:54:49 - 06:18:14 3082
Kelowna 06:06:27 -47.3 Dark Up 45.9 186.0 Up 05:54:45 - 06:18:10 3043
Peachland 06:06:28 -47.2 Dark Up 46.1 185.6 Up 05:54:46 - 06:18:11 3028
Summerland 06:06:28 -47.4 Dark Up 46.2 185.8 Up 05:54:46 - 06:18:11 3019
Penticton 06:06:27 -47.5 Dark Up 46.3 185.9 Up 05:54:44 - 06:18:09 3017
Oliver 06:06:27 -47.7 Dark Up 46.6 186.0 Up 05:54:44 - 06:18:09 2990
Anarchist Mountain Observatory 06:06:26 -47.9 Dark Up 46.8 186.3 Up 05:54:43 - 06:18:08 2982
Tonasket 06:06:26 -48.1 Dark Up 47.1 186.2 Up 05:54:43 - 06:18:08 2957
Okanogan 06:06:26 -48.2 Dark Up 47.4 186.0 Up 05:54:43 - 06:18:08 2928
Brewster 06:06:26 -48.3 Dark Up 47.7 185.8 Up 05:54:43 - 06:18:08 2902
Manson/Chelan 06:06:27 -48.3 Dark Up 48.0 185.2 Up 05:54:44 - 06:18:09 2877
Victoria 06:06:41 -46.2 Dark Up 47.4 180.5 Up 05:54:58 - 06:18:23 2850
Wenatchee 06:06:26 -48.5 Dark Up 48.4 185.0 Up 05:54:44 - 06:18:09 2837
Ellensburg 06:06:27 -48.6 Dark Up 48.9 184.7 Up 05:54:44 - 06:18:09 2799
Yakima 06:06:26 -48.9 Dark Up 49.3 184.8 Up 05:54:44 - 06:18:09 2767
PNWRO 06:06:20 -50.1 Dark Up 49.7 187.3 Up 05:54:37 - 06:18:02 2762
Toppenish/White Swan 06:06:25 -49.1 Dark Up 49.5 185.0 Up 05:54:43 - 06:18:08 2754
Goldendale 06:06:26 -49.2 Dark Up 50.0 184.4 Up 05:54:43 - 06:18:08 2699
Dunrhomin 06:05:18 -61.0 Dark Up 52.0 210.4 Up 05:53:36 - 06:17:01 2673
The Dalles 06:06:27 -49.1 Dark Up 50.3 183.9 Up 05:54:44 - 06:18:09 2672
CU-SBO 06:05:18 -61.2 Dark Up 52.2 210.4 Up 05:53:36 - 06:17:01 2650
Maupin 06:06:26 -49.4 Dark Up 50.7 184.1 Up 05:54:44 - 06:18:09 2641
Sisters 06:06:27 -49.7 Dark Up 51.6 183.4 Up 05:54:44 - 06:18:09 2558
Bend 06:06:25 -49.9 Dark Up 51.8 183.8 Up 05:54:43 - 06:18:08 2545
Oregon Observatory 06:06:26 -50.0 Dark Up 52.0 183.6 Up 05:54:43 - 06:18:08 2527
North Lake 06:06:22 -50.6 Dark Up 52.6 184.5 Up 05:54:40 - 06:18:05 2488
Lakeview 06:06:19 -51.6 Dark Up 53.6 185.5 Up 05:54:37 - 06:18:02 2415
Chiloquin 06:06:25 -50.4 Dark Up 53.3 183.0 Up 05:54:43 - 06:18:08 2407
Klamath Falls 06:06:25 -50.7 Dark Up 53.7 183.2 Up 05:54:42 - 06:18:07 2380
Cedarville 06:06:17 -52.0 Dark Up 54.3 185.9 Up 05:54:35 - 06:18:00 2364
Fall River/Burney 06:06:21 -51.5 Dark Up 54.8 183.9 Up 05:54:38 - 06:18:03 2290
Susanville 06:06:17 -52.3 Dark Up 55.4 185.2 Up 05:54:35 - 06:18:00 2257
Gimple 06:06:18 -52.3 Dark Up 55.7 184.9 Up 05:54:35 - 06:18:00 2227
Greenville 06:06:18 -52.3 Dark Up 55.7 184.8 Up 05:54:36 - 06:18:01 2225
Portola 06:06:15 -52.8 Dark Up 56.0 185.6 Up 05:54:33 - 06:17:58 2210
Quincy 06:06:18 -52.4 Dark Up 55.9 184.8 Up 05:54:35 - 06:18:00 2207
Reno 06:06:12 -53.3 Dark Up 56.2 186.8 Up 05:54:30 - 06:17:55 2204
Yerington 06:06:09 -54.0 Dark Up 56.7 188.1 Up 05:54:27 - 06:17:52 2175
Carson City 06:06:12 -53.5 Dark Up 56.6 186.9 Up 05:54:30 - 06:17:55 2174
Gardnerville 06:06:11 -53.7 Dark Up 56.8 187.0 Up 05:54:29 - 06:17:54 2154
Hawthorne 06:06:06 -54.6 Dark Up 57.1 189.1 Up 05:54:24 - 06:17:49 2149
Tonopah 06:06:00 -55.8 Dark Up 57.4 191.8 Up 05:54:17 - 06:17:42 2149
Lee Vining 06:06:07 -54.6 Dark Up 57.7 188.4 Up 05:54:25 - 06:17:50 2086
Indian Springs 06:05:51 -57.6 Dark Up 58.5 195.1 Up 05:54:08 - 06:17:33 2063
Beatty 06:05:56 -56.7 Dark Up 58.4 193.0 Up 05:54:13 - 06:17:38 2060
Bishop 06:06:04 -55.4 Dark Up 58.2 189.8 Up 05:54:21 - 06:17:46 2054
Henderson 06:05:47 -58.4 Dark Up 58.9 196.6 Up 05:54:04 - 06:17:29 2036
Patrick 06:05:42 -59.5 Dark Up 59.2 199.0 Up 05:53:59 - 06:17:24 2014
Kingman/Dolan Springs 06:05:42 -59.5 Dark Up 59.5 198.8 Up 05:54:00 - 06:17:25 1988
Laughlin/Bullhead City 06:05:44 -59.1 Dark Up 59.6 197.8 Up 05:54:02 - 06:17:27 1971
Mohave Valley 06:05:44 -59.3 Dark Up 59.9 197.9 Up 05:54:01 - 06:17:26 1947
George/Scottsdale 06:05:30 -61.7 Dark Up 60.2 203.7 Up 05:53:47 - 06:17:12 1923
Lake Havasu City 06:05:42 -59.6 Dark Up 60.2 198.6 Up 05:53:59 - 06:17:24 1918
Parker 06:05:41 -59.8 Dark Up 60.5 198.9 Up 05:53:58 - 06:17:23 1888
Idyllwild 06:05:50 -58.3 Dark Up 61.5 194.3 Up 05:54:08 - 06:17:33 1779
Calipatria 06:05:44 -59.5 Dark Up 61.8 197.0 Up 05:54:01 - 06:17:26 1758
Wildwood 06:05:58 -56.8 Dark Up 61.5 190.4 Up 05:54:16 - 06:17:41 1754
Yuma 06:05:39 -60.3 Dark Up 62.0 199.0 Up 05:53:57 - 06:17:22 1746

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, (2025/02/06 06:06UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 15.73  35
Alhena         06:37:42.8 +16:23:57  1.9 11.60  41
PPM 151776     07:01:55.2 +05:33:25  6.4  0.99  51
PPM 151571     06:56:25.7 +06:00:15  7.6  0.45  49
PPM 151640     06:58:20.8 +05:54:31  9.2  0.04  50
55638          06:58:14.4 +05:56:35 15.9        50
Positions are for J2000

Event circumstances last updated at 2022/04/05 23:09:51 UT

Marc W. Buie, Southwest Research Institute

RECON