RECON: TNO occultation with 544430

Event between (544430) 14UW224 and star GA1020:03316503 with event index number of 1707182

Geocentric closest approach at 2026/02/04 08:40:12 UTC

J2000 position of star is 09:25:14.1 +12:20:16
Equinox of date position of star is 09:26:19.8 +12:15:00
Stellar brightness G=14.4, use SENSEUP=64
Star is 27 degrees from the moon. Moon is 93% illuminated.
TNO apparent brightness V=25.7

[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 385 seconds.
The 1-sigma cross-track error in the shadow position is 4547 km.
The sky-plane scale is 26485.5 km/arcsec.

The TNO has an absolute magnitude Hv=10.0
Diameter=263.0 km assuming a 5% albedo -- 2.4 sec chord
Diameter=107.4 km assuming a 30% albedo -- 1.0 sec chord
Dynamical classification is 5:2EEE
 
 
 
 
 
 

Star training set for 544430, (2026/02/04 08:40UT)
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 2.3 sigma about the mid-time.
The median site spacing is 20.6 km RECON observability=1.0 and success probability=7.8%
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 08:40:49 -55.4 Dark Up 51.9 186.5 Up 08:25:49 - 08:55:49 4122
Kelowna 08:40:49 -55.8 Dark Up 52.3 186.3 Up 08:25:49 - 08:55:49 4086
Peachland 08:40:50 -56.0 Dark Up 52.5 185.9 Up 08:25:50 - 08:55:50 4070
Summerland 08:40:49 -56.1 Dark Up 52.6 186.0 Up 08:25:49 - 08:55:49 4060
Penticton 08:40:49 -56.1 Dark Up 52.7 186.2 Up 08:25:49 - 08:55:49 4057
Oliver 08:40:49 -56.5 Dark Up 53.0 186.3 Up 08:25:49 - 08:55:49 4028
Anarchist Mountain Observatory 08:40:48 -56.6 Dark Up 53.2 186.6 Up 08:25:48 - 08:55:48 4018
Tonasket 08:40:47 -56.9 Dark Up 53.5 186.5 Up 08:25:47 - 08:55:47 3991
Okanogan 08:40:48 -57.3 Dark Up 53.8 186.4 Up 08:25:48 - 08:55:48 3959
Brewster 08:40:47 -57.6 Dark Up 54.1 186.1 Up 08:25:47 - 08:55:47 3931
Manson/Chelan 08:40:49 -57.8 Dark Up 54.3 185.5 Up 08:25:49 - 08:55:49 3905
Victoria 08:40:58 -57.5 Dark Up 53.8 180.1 Up 08:25:58 - 08:55:58 3886
Entiat 08:40:49 -58.1 Dark Up 54.6 185.4 Up 08:25:49 - 08:55:49 3885
Wenatchee 08:40:48 -58.3 Dark Up 54.8 185.3 Up 08:25:48 - 08:55:48 3861
Ellensburg 08:40:48 -58.8 Dark Up 55.3 184.9 Up 08:25:48 - 08:55:48 3820
Pasco 08:40:43 -59.3 Dark Up 55.9 187.5 Up 08:25:43 - 08:55:43 3790
Yakima 08:40:48 -59.2 Dark Up 55.7 185.0 Up 08:25:48 - 08:55:48 3785
PNWRO 08:40:42 -59.5 Dark Up 56.1 187.9 Up 08:25:42 - 08:55:42 3774
Toppenish/White Swan 08:40:47 -59.3 Dark Up 55.9 185.3 Up 08:25:47 - 08:55:47 3770
Goldendale 08:40:47 -59.9 Dark Up 56.4 184.6 Up 08:25:47 - 08:55:47 3712
The Dalles 08:40:48 -60.2 Dark Up 56.7 184.0 Up 08:25:48 - 08:55:48 3683
Maupin 08:40:48 -60.6 Dark Up 57.1 184.2 Up 08:25:48 - 08:55:48 3649
Niwot 08:39:51 -59.7 Dark Up 58.0 214.8 Up 08:24:51 - 08:54:51 3635
SwRI 08:39:51 -59.9 Dark Up 58.1 214.7 Up 08:24:51 - 08:54:51 3622
Redmond 08:40:47 -61.5 Dark Up 58.0 184.1 Up 08:25:47 - 08:55:47 3567
Sisters 08:40:49 -61.5 Dark Up 58.0 183.4 Up 08:25:49 - 08:55:49 3559
Bend 08:40:47 -61.7 Dark Up 58.2 183.9 Up 08:25:47 - 08:55:47 3544
Oregon Observatory 08:40:48 -61.9 Dark Up 58.4 183.7 Up 08:25:48 - 08:55:48 3526
La Pine/Gilchrist 08:40:47 -62.1 Dark Up 58.6 183.6 Up 08:25:47 - 08:55:47 3506
North Lake 08:40:45 -62.5 Dark Up 59.0 184.8 Up 08:25:45 - 08:55:45 3482
Paisley 08:40:42 -63.0 Dark Up 59.5 185.5 Up 08:25:42 - 08:55:42 3441
Lakeview 08:40:42 -63.4 Dark Up 60.0 186.0 Up 08:25:42 - 08:55:42 3400
Klamath Falls 08:40:47 -63.6 Dark Up 60.1 183.2 Up 08:25:47 - 08:55:47 3367
Cedarville 08:40:40 -64.0 Dark Up 60.7 186.4 Up 08:25:40 - 08:55:40 3345
Fall River/Burney 08:40:43 -64.7 Dark Up 61.2 184.1 Up 08:25:43 - 08:55:43 3269
Susanville 08:40:40 -65.2 Dark Up 61.8 185.7 Up 08:25:40 - 08:55:40 3230
Gimple 08:40:41 -65.5 Dark Up 62.1 185.3 Up 08:25:41 - 08:55:41 3198
Greenville 08:40:41 -65.5 Dark Up 62.1 185.1 Up 08:25:41 - 08:55:41 3196
Portola 08:40:39 -65.8 Dark Up 62.4 186.2 Up 08:25:39 - 08:55:39 3178
Quincy 08:40:41 -65.7 Dark Up 62.3 185.1 Up 08:25:41 - 08:55:41 3177
Reno 08:40:36 -65.9 Dark Up 62.6 187.6 Up 08:25:36 - 08:55:36 3171
Carson City 08:40:36 -66.2 Dark Up 63.0 187.7 Up 08:25:36 - 08:55:36 3138
Yerington 08:40:34 -66.3 Dark Up 63.1 189.1 Up 08:25:34 - 08:55:34 3137
Gardnerville 08:40:35 -66.4 Dark Up 63.2 187.9 Up 08:25:35 - 08:55:35 3116
Hawthorne 08:40:31 -66.6 Dark Up 63.5 190.4 Up 08:25:31 - 08:55:31 3108
Tonopah 08:40:26 -66.6 Dark Up 63.7 193.6 Up 08:25:26 - 08:55:26 3104
Lee Vining 08:40:32 -67.2 Dark Up 64.1 189.5 Up 08:25:32 - 08:55:32 3042
Indian Springs 08:40:19 -67.4 Dark Up 64.8 197.7 Up 08:25:19 - 08:55:19 3008
Beatty 08:40:23 -67.5 Dark Up 64.7 195.2 Up 08:25:23 - 08:55:23 3007
Bishop 08:40:29 -67.6 Dark Up 64.6 191.3 Up 08:25:29 - 08:55:29 3005
Henderson 08:40:15 -67.6 Dark Up 65.1 199.6 Up 08:25:15 - 08:55:15 2977
Patrick 08:40:10 -67.7 Dark Up 65.4 202.5 Up 08:25:10 - 08:55:10 2951
DCO 08:40:07 -67.6 Dark Up 65.5 204.4 Up 08:25:07 - 08:55:07 2944
Searchlight/Boulder City 08:40:14 -68.1 Dark Up 65.7 200.2 Up 08:25:14 - 08:55:14 2925
Kingman/Dolan Springs 08:40:11 -67.9 Dark Up 65.7 202.3 Up 08:25:11 - 08:55:11 2925
Laughlin/Bullhead City 08:40:13 -68.2 Dark Up 65.8 201.2 Up 08:25:13 - 08:55:13 2907
Mohave Valley 08:40:12 -68.4 Dark Up 66.1 201.4 Up 08:25:12 - 08:55:12 2881
George/Scottsdale 08:40:01 -68.0 Dark Up 66.2 208.6 Up 08:25:01 - 08:55:01 2851
Lake Havasu City 08:40:10 -68.6 Dark Up 66.4 202.3 Up 08:25:10 - 08:55:10 2851
Parker 08:40:10 -68.9 Dark Up 66.7 202.7 Up 08:25:10 - 08:55:10 2818
Blythe 08:40:10 -69.5 Dark Up 67.3 202.4 Up 08:25:10 - 08:55:10 2759
CPSLO 08:40:33 -70.1 Dark Up 66.9 186.7 Up 08:25:33 - 08:55:33 2745
Idyllwild 08:40:17 -70.3 Dark Up 67.8 197.2 Up 08:25:17 - 08:55:17 2707
Wildwood 08:40:25 -70.7 Dark Up 67.8 192.3 Up 08:25:25 - 08:55:25 2687
Calipatria 08:40:13 -70.3 Dark Up 68.0 200.6 Up 08:25:13 - 08:55:13 2683
Yuma 08:40:09 -70.3 Dark Up 68.2 203.2 Up 08:25:09 - 08:55:09 2669

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 08:40UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:22.0 +11:58:02  1.3 10.55  17
5Xi Leo        09:31:56.6 +11:17:58  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 2020/03/02 22:24:17 UT

Marc W. Buie, Southwest Research Institute

RECON