RECON: TNO occultation with 544430

Event between (544430) 14UW224 and star GA1020:03316503 with event index number of 2251842

Geocentric closest approach at 2026/02/04 08:42:03 UTC

J2000 position of star is 09:25:14.1 +12:20:16
Equinox of date position of star is 09:26:26.6 +12:14:27
Stellar brightness G=14.4, use SENSEUP=64 with the MallinCam and and exposure time of 1 seconds with the QHY174 camera.
Star is 27 degrees from the moon. Moon is 93% illuminated.
TNO apparent brightness V=22.5

[RECON map]
TNO is 37.5 AU from the Sun and 36.5 AU from the Earth.
The TNO is moving 24.7 km/sec on the sky relative to the star, or, 3.4 arcsec/hr.
The 1-sigma error in the time of the event is 169 seconds.
The 1-sigma cross-track error in the shadow position is 2415 km.
The sky-plane scale is 26485.5 km/arcsec.

The TNO has an absolute magnitude Hv=6.8
Diameter=257.0 km assuming a 5% albedo -- 10.7 sec chord
Diameter=104.9 km assuming a 30% albedo -- 4.4 sec chord
Dynamical classification is 5:2EEE
 
 
 
 
 
 

Star training set for 544430, (2026/02/04 08:42UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:45.6 +11:50:19  1.3 10.55  17
5Xi Leo        09:33:21.0 +11:10:59  5.0  1.94  25
PPM 126472     09:29:01.3 +12:17:06  7.9  0.58  26
PPM 126418     09:25:45.3 +12:24:24  9.5  0.28  27
PPM 126434     09:26:39.0 +12:04:18 11.0  0.15  27
544430         09:26:39.1 +12:13:27 14.4        26
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 25.6 km RECON observability=1.0 and success probability=21.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 08:42:06 -50.4 Dark Up 47.7 206.4 Up 08:27:32 - 08:56:41 1721
Kamloops 08:42:42 -55.1 Dark Up 51.6 185.6 Up 08:28:07 - 08:57:16 1280
Kelowna 08:42:38 -55.7 Dark Up 52.3 187.1 Up 08:28:04 - 08:57:13 1234
Peachland 08:42:39 -55.9 Dark Up 52.4 186.6 Up 08:28:04 - 08:57:13 1218
Summerland 08:42:38 -56.0 Dark Up 52.6 186.8 Up 08:28:04 - 08:57:13 1208
Penticton 08:42:38 -56.1 Dark Up 52.6 187.0 Up 08:28:03 - 08:57:12 1205
Oliver 08:42:38 -56.4 Dark Up 53.0 187.0 Up 08:28:03 - 08:57:12 1175
Anarchist Mountain Observatory 08:42:37 -56.6 Dark Up 53.1 187.4 Up 08:28:03 - 08:57:12 1166
Tonasket 08:42:37 -56.9 Dark Up 53.4 187.3 Up 08:28:02 - 08:57:11 1138
Okanogan 08:42:37 -57.2 Dark Up 53.8 187.1 Up 08:28:02 - 08:57:11 1107
Brewster 08:42:37 -57.5 Dark Up 54.1 186.8 Up 08:28:02 - 08:57:11 1079
Manson/Chelan 08:42:38 -57.8 Dark Up 54.3 186.2 Up 08:28:03 - 08:57:12 1053
Victoria 08:42:48 -57.5 Dark Up 53.8 180.8 Up 08:28:13 - 08:57:22 1033
Wenatchee 08:42:38 -58.3 Dark Up 54.8 186.0 Up 08:28:03 - 08:57:12 1008
Ellensburg 08:42:38 -58.7 Dark Up 55.2 185.7 Up 08:28:03 - 08:57:12 968
Yakima 08:42:38 -59.1 Dark Up 55.6 185.7 Up 08:28:03 - 08:57:12 933
PNWRO 08:42:32 -59.4 Dark Up 56.1 188.7 Up 08:27:57 - 08:57:06 922
Toppenish/White Swan 08:42:37 -59.3 Dark Up 55.8 186.1 Up 08:28:02 - 08:57:11 918
Goldendale 08:42:37 -59.9 Dark Up 56.4 185.4 Up 08:28:02 - 08:57:11 860
The Dalles 08:42:38 -60.2 Dark Up 56.7 184.8 Up 08:28:03 - 08:57:12 831
Dunrhomin 08:41:41 -59.4 Dark Up 57.7 215.4 Up 08:27:07 - 08:56:16 797
Maupin 08:42:37 -60.5 Dark Up 57.1 185.0 Up 08:28:02 - 08:57:11 797
CU-SBO 08:41:40 -59.6 Dark Up 57.9 215.5 Up 08:27:06 - 08:56:15 773
Sisters 08:42:37 -61.5 Dark Up 58.0 184.2 Up 08:28:03 - 08:57:12 707
Bend 08:42:36 -61.7 Dark Up 58.2 184.7 Up 08:28:02 - 08:57:11 693
Oregon Observatory 08:42:36 -61.9 Dark Up 58.4 184.5 Up 08:28:02 - 08:57:11 674
North Lake 08:42:34 -62.4 Dark Up 59.0 185.6 Up 08:28:00 - 08:57:09 630
Lakeview 08:42:31 -63.3 Dark Up 60.0 186.9 Up 08:27:57 - 08:57:06 549
Chiloquin 08:42:36 -63.2 Dark Up 59.7 183.9 Up 08:28:02 - 08:57:11 545
Klamath Falls 08:42:36 -63.5 Dark Up 60.1 184.1 Up 08:28:01 - 08:57:10 516
Cedarville 08:42:30 -63.9 Dark Up 60.6 187.3 Up 08:27:55 - 08:57:04 493
Fall River/Burney 08:42:33 -64.6 Dark Up 61.2 185.0 Up 08:27:58 - 08:57:07 417
Susanville 08:42:30 -65.1 Dark Up 61.8 186.6 Up 08:27:55 - 08:57:04 379
Gimple 08:42:30 -65.4 Dark Up 62.1 186.2 Up 08:27:55 - 08:57:04 347
Greenville 08:42:30 -65.4 Dark Up 62.1 186.1 Up 08:27:56 - 08:57:05 345
Portola 08:42:28 -65.7 Dark Up 62.4 187.1 Up 08:27:54 - 08:57:03 328
Quincy 08:42:30 -65.6 Dark Up 62.3 186.1 Up 08:27:55 - 08:57:04 327
Reno 08:42:26 -65.8 Dark Up 62.6 188.5 Up 08:27:51 - 08:57:00 320
Carson City 08:42:25 -66.1 Dark Up 62.9 188.7 Up 08:27:51 - 08:57:00 288
Yerington 08:42:23 -66.1 Dark Up 63.0 190.1 Up 08:27:48 - 08:56:57 286
Gardnerville 08:42:25 -66.3 Dark Up 63.2 188.8 Up 08:27:50 - 08:56:59 266
Hawthorne 08:42:20 -66.4 Dark Up 63.4 191.4 Up 08:27:46 - 08:56:55 258
Tonopah 08:42:15 -66.5 Dark Up 63.6 194.6 Up 08:27:41 - 08:56:50 253
Lee Vining 08:42:21 -67.1 Dark Up 64.0 190.5 Up 08:27:47 - 08:56:56 192
Indian Springs 08:42:08 -67.2 Dark Up 64.7 198.7 Up 08:27:33 - 08:56:42 158
Beatty 08:42:12 -67.3 Dark Up 64.6 196.2 Up 08:27:37 - 08:56:46 158
Bishop 08:42:18 -67.5 Dark Up 64.5 192.3 Up 08:27:44 - 08:56:53 155
Henderson 08:42:05 -67.4 Dark Up 65.0 200.6 Up 08:27:30 - 08:56:39 128
Patrick 08:42:00 -67.5 Dark Up 65.3 203.6 Up 08:27:25 - 08:56:34 102
Kingman/Dolan Springs 08:42:00 -67.7 Dark Up 65.5 203.3 Up 08:27:26 - 08:56:35 75
Laughlin/Bullhead City 08:42:02 -68.0 Dark Up 65.7 202.2 Up 08:27:27 - 08:56:36 58
Mohave Valley 08:42:01 -68.2 Dark Up 66.0 202.4 Up 08:27:27 - 08:56:36 32
George/Scottsdale 08:41:50 -67.8 Dark Up 66.1 209.6 Up 08:27:16 - 08:56:25 3
Lake Havasu City 08:42:00 -68.4 Dark Up 66.3 203.4 Up 08:27:25 - 08:56:34 2
Parker 08:41:59 -68.7 Dark Up 66.6 203.7 Up 08:27:25 - 08:56:34 -31
Idyllwild 08:42:07 -70.1 Dark Up 67.7 198.4 Up 08:27:32 - 08:56:41 -142
Wildwood 08:42:14 -70.5 Dark Up 67.7 193.5 Up 08:27:40 - 08:56:49 -163
Calipatria 08:42:02 -70.1 Dark Up 67.9 201.8 Up 08:27:27 - 08:56:36 -166
Yuma 08:41:58 -70.0 Dark Up 68.0 204.3 Up 08:27:24 - 08:56:33 -180

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 544430, (2026/02/04 08:42UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3 10.55  17
5Xi Leo        09:31:56.6 +11:17:57  5.0  1.94  25
PPM 126472     09:27:36.4 +12:23:59  7.9  0.58  26
PPM 126418     09:24:20.2 +12:31:12  9.5  0.28  27
PPM 126434     09:25:14.1 +12:11:07 11.0  0.15  27
544430         09:25:14.1 +12:20:16 14.4        27
Positions are for J2000

Event circumstances last updated at 2022/04/13 23:10:04 UT

Marc W. Buie, Southwest Research Institute

RECON