RECON: TNO occultation with 55638

Event between (55638) 02VE95 and star GA0940:02621464 with event index number of 2250323

Geocentric closest approach at 2027/01/10 05:25:38 UTC

J2000 position of star is 07:18:39.8 +05:12:59
Equinox of date position of star is 07:19:50.9 +05:10:27
Stellar brightness G=15.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 150 degrees from the moon. Moon is 5% illuminated.
TNO apparent brightness V=20.3

[RECON map]
TNO is 32.0 AU from the Sun and 31.0 AU from the Earth.
The TNO is moving 24.7 km/sec on the sky relative to the star, or, 3.9 arcsec/hr.
The 1-sigma error in the time of the event is 158 seconds.
The 1-sigma cross-track error in the shadow position is 1515 km.
The sky-plane scale is 22492.3 km/arcsec.

The TNO has an absolute magnitude Hv=5.3
Diameter=524.8 km assuming a 5% albedo -- 21.3 sec chord
Diameter=214.3 km assuming a 30% albedo -- 8.7 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 55638, (2027/01/10 05:26UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:38.1 +07:24:35  0.4 20.86 131
Alhena         06:39:16.4 +16:22:26  1.9 15.03 143
PPM 152316     07:18:44.8 +06:37:51  6.4  1.50 150
PPM 152294     07:18:08.7 +05:18:39  8.4  0.51 150
PPM 152381     07:20:43.4 +05:13:49  8.9  0.17 150
55638          07:20:06.0 +05:09:55 15.8       150
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 27.0 km RECON observability=1.0 and success probability=30.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 05:27:10 -53.9 Dark Down 39.0 148.2 Up 05:13:31 - 05:40:49 -5
Kamloops 05:27:46 -47.6 Dark Down 34.3 131.3 Up 05:14:07 - 05:41:25 -187
Kelowna 05:27:45 -48.5 Dark Down 35.3 131.8 Up 05:14:06 - 05:41:24 -252
Peachland 05:27:46 -48.3 Dark Down 35.2 131.4 Up 05:14:07 - 05:41:25 -262
Summerland 05:27:46 -48.5 Dark Down 35.4 131.4 Up 05:14:07 - 05:41:25 -274
Penticton 05:27:46 -48.6 Dark Down 35.5 131.5 Up 05:14:07 - 05:41:25 -280
Oliver 05:27:47 -48.7 Dark Down 35.7 131.3 Up 05:14:08 - 05:41:26 -310
Anarchist Mountain Observatory 05:27:46 -48.9 Dark Down 35.9 131.4 Up 05:14:07 - 05:41:25 -323
Tonasket 05:27:47 -49.0 Dark Down 36.1 131.2 Up 05:14:08 - 05:41:26 -350
Victoria 05:27:56 -46.7 Dark Down 34.2 127.0 Up 05:14:17 - 05:41:35 -379
Okanogan 05:27:48 -49.1 Dark Down 36.2 130.9 Up 05:14:09 - 05:41:27 -379
Brewster 05:27:49 -49.1 Dark Down 36.3 130.5 Up 05:14:10 - 05:41:28 -403
Manson/Chelan 05:27:50 -48.9 Dark Down 36.2 130.0 Up 05:14:11 - 05:41:29 -423
Wenatchee 05:27:51 -49.0 Dark Down 36.5 129.6 Up 05:14:12 - 05:41:30 -464
Ellensburg 05:27:52 -49.1 Dark Down 36.6 129.1 Up 05:14:13 - 05:41:31 -501
Yakima 05:27:53 -49.2 Dark Down 36.9 128.8 Up 05:14:14 - 05:41:32 -537
Toppenish/White Swan 05:27:53 -49.4 Dark Down 37.1 128.9 Up 05:14:14 - 05:41:32 -555
PNWRO 05:27:50 -50.5 Dark Down 38.1 130.3 Up 05:14:11 - 05:41:29 -582
Goldendale 05:27:55 -49.3 Dark Down 37.2 128.1 Up 05:14:16 - 05:41:34 -606
The Dalles 05:27:56 -49.2 Dark Down 37.1 127.6 Up 05:14:17 - 05:41:35 -627
Maupin 05:27:57 -49.4 Dark Down 37.5 127.5 Up 05:14:18 - 05:41:36 -664
Sisters 05:27:59 -49.4 Dark Down 37.7 126.4 Up 05:14:20 - 05:41:38 -745
Bend 05:27:59 -49.7 Dark Down 38.0 126.5 Up 05:14:20 - 05:41:38 -766
Oregon Observatory 05:27:59 -49.6 Dark Down 38.0 126.3 Up 05:14:20 - 05:41:38 -782
North Lake 05:27:59 -50.2 Dark Down 38.7 126.5 Up 05:14:20 - 05:41:38 -838
Chiloquin 05:28:03 -49.8 Dark Down 38.6 125.1 Up 05:14:24 - 05:41:42 -904
Lakeview 05:27:59 -50.9 Dark Down 39.7 126.3 Up 05:14:20 - 05:41:38 -933
Klamath Falls 05:28:03 -49.9 Dark Down 38.8 124.9 Up 05:14:24 - 05:41:42 -935
Cedarville 05:28:00 -51.3 Dark Down 40.2 126.1 Up 05:14:21 - 05:41:39 -994
Dunrhomin 05:27:18 -61.9 Dark Down 49.1 142.7 Up 05:13:39 - 05:40:57 -1026
Fall River/Burney 05:28:03 -50.5 Dark Down 39.7 124.5 Up 05:14:24 - 05:41:42 -1044
CU-SBO 05:27:18 -62.0 Dark Down 49.2 142.4 Up 05:13:39 - 05:40:57 -1050
Susanville 05:28:02 -51.2 Dark Down 40.5 124.8 Up 05:14:23 - 05:41:41 -1101
Gimple 05:28:03 -51.2 Dark Down 40.6 124.4 Up 05:14:24 - 05:41:42 -1128
Greenville 05:28:03 -51.1 Dark Down 40.5 124.3 Up 05:14:24 - 05:41:42 -1128
Quincy 05:28:04 -51.2 Dark Down 40.6 124.2 Up 05:14:25 - 05:41:43 -1147
Portola 05:28:02 -51.5 Dark Down 41.0 124.6 Up 05:14:23 - 05:41:41 -1157
Reno 05:28:01 -52.1 Dark Down 41.6 125.1 Up 05:14:22 - 05:41:40 -1180
Carson City 05:28:02 -52.2 Dark Down 41.8 124.8 Up 05:14:23 - 05:41:41 -1214
Yerington 05:28:00 -52.7 Dark Down 42.3 125.3 Up 05:14:21 - 05:41:39 -1230
Gardnerville 05:28:02 -52.3 Dark Down 41.9 124.7 Up 05:14:23 - 05:41:41 -1237
Hawthorne 05:27:59 -53.2 Dark Down 42.9 125.5 Up 05:14:20 - 05:41:38 -1272
Tonopah 05:27:56 -54.4 Dark Down 44.1 126.6 Up 05:14:17 - 05:41:35 -1310
Lee Vining 05:28:01 -53.0 Dark Down 42.9 124.6 Up 05:14:22 - 05:41:40 -1328
Bishop 05:28:00 -53.7 Dark Down 43.7 124.9 Up 05:14:21 - 05:41:39 -1383
Beatty 05:27:56 -55.1 Dark Down 45.0 126.2 Up 05:14:17 - 05:41:35 -1420
Indian Springs 05:27:53 -56.0 Dark Down 45.9 127.1 Up 05:14:14 - 05:41:32 -1446
Henderson 05:27:51 -56.7 Dark Down 46.7 127.4 Up 05:14:12 - 05:41:30 -1495
Patrick 05:27:48 -57.7 Dark Down 47.8 128.1 Up 05:14:09 - 05:41:27 -1550
Kingman/Dolan Springs 05:27:49 -57.6 Dark Down 47.8 127.7 Up 05:14:10 - 05:41:28 -1573
Laughlin/Bullhead City 05:27:51 -57.2 Dark Down 47.5 127.1 Up 05:14:12 - 05:41:30 -1579
Mohave Valley 05:27:51 -57.3 Dark Down 47.6 126.9 Up 05:14:12 - 05:41:30 -1606
Lake Havasu City 05:27:51 -57.6 Dark Down 48.0 126.8 Up 05:14:12 - 05:41:30 -1644
Parker 05:27:51 -57.7 Dark Down 48.3 126.5 Up 05:14:12 - 05:41:30 -1679
George/Scottsdale 05:27:43 -59.7 Dark Down 50.1 128.9 Up 05:14:04 - 05:41:22 -1706
Wildwood 05:28:04 -54.2 Dark Down 45.4 122.0 Up 05:14:25 - 05:41:43 -1708
Idyllwild 05:27:59 -55.8 Dark Down 46.9 123.6 Up 05:14:20 - 05:41:38 -1733
Calipatria 05:27:55 -56.9 Dark Down 48.0 124.3 Up 05:14:16 - 05:41:34 -1789
Yuma 05:27:53 -57.7 Dark Down 48.9 124.8 Up 05:14:14 - 05:41:32 -1827

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, (2027/01/10 05:26UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 20.86 131
Alhena         06:37:42.8 +16:23:57  1.9 15.03 143
PPM 152316     07:17:17.8 +06:40:52  6.4  1.50 150
PPM 152294     07:16:42.4 +05:21:39  8.4  0.51 150
PPM 152381     07:19:17.2 +05:16:55  8.9  0.17 150
55638          07:18:39.8 +05:12:59 15.8       150
Positions are for J2000

Event circumstances last updated at 2022/04/26 23:06:15 UT

Marc W. Buie, Southwest Research Institute

RECON