RECON: TNO occultation with 55638

Event between (55638) 02VE95 and star GA0960:01633883 with event index number of 1028901

Geocentric closest approach at 2021/01/01 09:55:45 UTC

J2000 position of star is 06:24:30.0 +06:52:00
Equinox of date position of star is 06:25:37.8 +06:51:14
Stellar brightness G=16.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 38 degrees from the moon. Moon is 94% illuminated.
TNO apparent brightness V=20.1

[RECON map]
TNO is 30.4 AU from the Sun and 29.5 AU from the Earth.
The TNO is moving 24.3 km/sec on the sky relative to the star, or, 4.1 arcsec/hr.
The 1-sigma error in the time of the event is 44 seconds.
The 1-sigma cross-track error in the shadow position is 1069 km.
The sky-plane scale is 21381.9 km/arcsec.

The TNO has an absolute magnitude Hv=5.3
Diameter=524.8 km assuming a 5% albedo -- 21.6 sec chord
Diameter=214.3 km assuming a 30% albedo -- 8.8 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 55638, (2021/01/01 09:56UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:18.6 +07:24:33  0.4  7.29  44
Alhena         06:38:55.5 +16:22:46  1.9 10.07  31
PPM 150217     06:18:06.4 +07:02:36  6.4  1.88  39
PPM 150436     06:25:23.4 +07:03:34  8.5  0.21  37
PPM 150450     06:25:53.7 +06:49:43  9.0  0.07  37
55638          06:25:37.9 +06:51:14 16.8        37
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 25.2 km RECON observability=1.0 and success probability=29.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Clarence Fulton 09:54:21 -54.9 Dark Up 38.0 225.4 Up 09:50:11 - 09:58:31 -355
Kelowna 09:54:21 -55.2 Dark Up 38.3 225.5 Up 09:50:11 - 09:58:31 -386
Peachland 09:54:21 -55.4 Dark Up 38.6 225.2 Up 09:50:11 - 09:58:31 -396
Summerland 09:54:21 -55.5 Dark Up 38.6 225.4 Up 09:50:11 - 09:58:31 -407
Penticton 09:54:20 -55.5 Dark Up 38.6 225.5 Up 09:50:10 - 09:58:30 -411
Oliver 09:54:20 -55.7 Dark Up 38.9 225.7 Up 09:50:10 - 09:58:30 -439
Anarchist Mountain Observatory 09:54:19 -55.7 Dark Up 38.9 226.1 Up 09:50:09 - 09:58:29 -450
Tonasket 09:54:18 -55.9 Dark Up 39.1 226.2 Up 09:50:08 - 09:58:28 -475
Okanogan 09:54:18 -56.2 Dark Up 39.4 226.2 Up 09:50:08 - 09:58:28 -503
Victoria 09:54:28 -58.0 Dark Up 41.1 221.7 Up 09:50:18 - 09:58:38 -523
Brewster 09:54:18 -56.5 Dark Up 39.7 226.1 Up 09:50:08 - 09:58:28 -526
Manson/Chelan 09:54:18 -56.8 Dark Up 40.0 225.8 Up 09:50:08 - 09:58:28 -546
Wenatchee 09:54:18 -57.2 Dark Up 40.5 225.9 Up 09:50:08 - 09:58:28 -585
Ellensburg 09:54:18 -57.6 Dark Up 40.9 225.9 Up 09:50:08 - 09:58:28 -620
Yakima 09:54:17 -57.9 Dark Up 41.2 226.1 Up 09:50:07 - 09:58:27 -653
Pasco 09:54:12 -57.3 Dark Up 40.7 228.0 Up 09:50:02 - 09:58:22 -668
Toppenish/White Swan 09:54:16 -57.9 Dark Up 41.2 226.5 Up 09:50:06 - 09:58:26 -670
PNWRO 09:54:12 -57.3 Dark Up 40.7 228.4 Up 09:50:02 - 09:58:22 -686
Goldendale 09:54:16 -58.5 Dark Up 41.8 226.3 Up 09:50:06 - 09:58:26 -718
The Dalles 09:54:17 -58.8 Dark Up 42.2 226.1 Up 09:50:07 - 09:58:27 -740
Maupin 09:54:16 -59.0 Dark Up 42.4 226.5 Up 09:50:06 - 09:58:26 -774
Redmond 09:54:14 -59.6 Dark Up 43.1 227.0 Up 09:50:04 - 09:58:24 -850
Sisters 09:54:15 -59.8 Dark Up 43.3 226.5 Up 09:50:05 - 09:58:25 -852
Bend 09:54:14 -59.8 Dark Up 43.3 226.9 Up 09:50:04 - 09:58:24 -869
Oregon Observatory 09:54:14 -60.0 Dark Up 43.5 226.9 Up 09:50:04 - 09:58:24 -885
La Pine/Gilchrist 09:54:14 -60.1 Dark Up 43.6 227.0 Up 09:50:04 - 09:58:24 -903
North Lake 09:54:12 -60.0 Dark Up 43.6 228.0 Up 09:50:02 - 09:58:22 -935
Paisley 09:54:09 -60.1 Dark Up 43.8 228.8 Up 09:49:59 - 09:58:19 -979
Lakeview 09:54:08 -60.3 Dark Up 44.0 229.3 Up 09:49:58 - 09:58:18 -1021
Klamath Falls 09:54:12 -61.1 Dark Up 44.8 227.7 Up 09:50:02 - 09:58:22 -1031
Dunrhomin 09:53:25 -50.5 Dark Up 35.5 245.7 Up 09:49:15 - 09:57:35 -1034
Cedarville 09:54:06 -60.5 Dark Up 44.3 230.0 Up 09:49:56 - 09:58:16 -1076
Fall River/Burney 09:54:09 -61.5 Dark Up 45.4 229.0 Up 09:49:59 - 09:58:19 -1131
Susanville 09:54:06 -61.4 Dark Up 45.3 230.3 Up 09:49:56 - 09:58:16 -1179
Gimple 09:54:06 -61.6 Dark Up 45.6 230.3 Up 09:49:56 - 09:58:16 -1206
Greenville 09:54:06 -61.7 Dark Up 45.7 230.2 Up 09:49:56 - 09:58:16 -1207
Quincy 09:54:05 -61.8 Dark Up 45.8 230.4 Up 09:49:55 - 09:58:15 -1225
Portola 09:54:04 -61.5 Dark Up 45.6 231.0 Up 09:49:54 - 09:58:14 -1231
Reno 09:54:02 -61.2 Dark Up 45.4 231.9 Up 09:49:52 - 09:58:12 -1249
Carson City 09:54:01 -61.4 Dark Up 45.6 232.3 Up 09:49:51 - 09:58:11 -1281
Yerington 09:53:59 -61.0 Dark Up 45.3 233.1 Up 09:49:49 - 09:58:09 -1292
Gardnerville 09:54:00 -61.5 Dark Up 45.7 232.5 Up 09:49:50 - 09:58:10 -1302
Hawthorne 09:53:56 -60.8 Dark Up 45.3 234.1 Up 09:49:46 - 09:58:06 -1329
Tonopah 09:53:51 -60.0 Dark Up 44.7 235.9 Up 09:49:41 - 09:58:01 -1357
Lee Vining 09:53:57 -61.4 Dark Up 45.9 234.0 Up 09:49:47 - 09:58:07 -1385
Bishop 09:53:54 -61.1 Dark Up 45.8 235.3 Up 09:49:44 - 09:58:04 -1432
Beatty 09:53:48 -60.1 Dark Up 45.0 237.3 Up 09:49:38 - 09:57:58 -1458
Indian Springs 09:53:44 -59.4 Dark Up 44.5 238.7 Up 09:49:34 - 09:57:54 -1477
Henderson 09:53:41 -59.0 Dark Up 44.3 239.8 Up 09:49:31 - 09:57:51 -1519
Patrick 09:53:37 -58.3 Dark Up 43.8 241.4 Up 09:49:27 - 09:57:47 -1565
Kingman/Dolan Springs 09:53:37 -58.5 Dark Up 44.0 241.4 Up 09:49:27 - 09:57:47 -1588
Laughlin/Bullhead City 09:53:38 -58.9 Dark Up 44.4 241.0 Up 09:49:28 - 09:57:48 -1596
Mohave Valley 09:53:38 -59.0 Dark Up 44.5 241.2 Up 09:49:28 - 09:57:48 -1622
CPSLO 09:53:57 -63.6 Dark Up 48.5 234.6 Up 09:49:47 - 09:58:07 -1648
Lake Havasu City 09:53:36 -58.9 Dark Up 44.5 241.8 Up 09:49:26 - 09:57:46 -1657
Parker 09:53:36 -58.9 Dark Up 44.7 242.1 Up 09:49:26 - 09:57:46 -1690
George/Scottsdale 09:53:28 -57.1 Dark Up 43.1 244.7 Up 09:49:18 - 09:57:38 -1702
Wildwood 09:53:48 -62.4 Dark Up 47.8 237.9 Up 09:49:38 - 09:57:58 -1741
Blythe 09:53:36 -59.3 Dark Up 45.2 242.3 Up 09:49:26 - 09:57:46 -1743
Idyllwild 09:53:42 -61.0 Dark Up 46.6 240.2 Up 09:49:32 - 09:57:52 -1754
Calipatria 09:53:38 -60.1 Dark Up 46.1 241.9 Up 09:49:28 - 09:57:48 -1800
Yuma 09:53:34 -59.5 Dark Up 45.6 243.1 Up 09:49:24 - 09:57:44 -1831

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, (2021/01/01 09:56UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  7.29  44
Alhena         06:37:42.8 +16:23:57  1.9 10.07  31
PPM 150217     06:16:58.4 +07:03:08  6.4  1.88  39
PPM 150436     06:24:15.3 +07:04:20  8.5  0.21  37
PPM 150450     06:24:45.8 +06:50:29  9.0  0.07  37
55638          06:24:30.0 +06:52:00 16.8        37
Positions are for J2000

Event circumstances last updated at 2020/12/23 00:24:16 UT

Marc W. Buie, Southwest Research Institute

RECON