RECON: TNO occultation with 523776

Event between (523776) 14YB50 and star GA1200:03283283 with event index number of 1646194

Geocentric closest approach at 2026/12/21 12:04:42 UTC

J2000 position of star is 09:26:01.8 +30:57:51
Equinox of date position of star is 09:27:13.8 +30:52:34
Stellar brightness G=11.6, use SENSEUP=8
Star is 80 degrees from the moon. Moon is 90% illuminated.
TNO apparent brightness V=25.8

[RECON map]
TNO is 37.7 AU from the Sun and 37.0 AU from the Earth.
The TNO is moving 18.6 km/sec on the sky relative to the star, or, 2.5 arcsec/hr.
The 1-sigma error in the time of the event is 319 seconds.
The 1-sigma cross-track error in the shadow position is 4298 km.
The sky-plane scale is 26821.6 km/arcsec.

The TNO has an absolute magnitude Hv=10.0
Diameter=363.1 km assuming a 5% albedo -- 3.2 sec chord
Diameter=148.2 km assuming a 30% albedo -- 1.3 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 523776, (2026/12/21 12:05UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:48.4 +11:50:04  1.3 21.37  96
PPM 099676     09:34:52.7 +28:14:49  6.4  3.04  82
PPM 074553     09:31:48.0 +31:12:28  7.9  0.96  80
PPM 074501     09:27:35.5 +31:11:53  9.8  0.35  79
523776         09:27:38.1 +30:50:47 11.6        80
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 2.8 sigma about the mid-time.
The median site spacing is 14.0 km RECON observability=1.0 and success probability=5.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Niwot 12:04:05 -25.0 Dark Down 68.2 252.8 Up 11:49:05 - 12:19:05 6917
SwRI 12:04:04 -25.0 Dark Down 68.3 253.0 Up 11:49:04 - 12:19:04 6904
Clarence Fulton 12:05:27 -35.2 Dark Up 69.1 206.4 Up 11:50:27 - 12:20:27 6714
Kelowna 12:05:26 -35.3 Dark Up 69.5 206.5 Up 11:50:26 - 12:20:26 6680
Peachland 12:05:28 -35.5 Dark Up 69.7 205.9 Up 11:50:28 - 12:20:28 6657
Penticton 12:05:27 -35.4 Dark Up 69.9 206.6 Up 11:50:27 - 12:20:27 6653
Summerland 12:05:27 -35.5 Dark Up 69.8 206.3 Up 11:50:27 - 12:20:27 6652
Oliver 12:05:24 -35.5 Dark Up 70.2 207.0 Up 11:50:24 - 12:20:24 6629
Anarchist Mountain Observatory 12:05:24 -35.3 Dark Up 70.3 207.7 Up 11:50:24 - 12:20:24 6628
Tonasket 12:05:20 -35.4 Dark Up 70.6 207.9 Up 11:50:20 - 12:20:20 6604
Okanogan 12:05:20 -35.5 Dark Up 70.9 208.0 Up 11:50:20 - 12:20:20 6573
Brewster 12:05:20 -35.7 Dark Up 71.2 207.9 Up 11:50:20 - 12:20:20 6543
Manson/Chelan 12:05:20 -36.0 Dark Up 71.5 207.2 Up 11:50:20 - 12:20:20 6509
Entiat 12:05:19 -36.0 Dark Up 71.7 207.4 Up 11:50:19 - 12:20:19 6490
Wenatchee 12:05:17 -36.1 Dark Up 72.0 207.4 Up 11:50:17 - 12:20:17 6467
Pasco 12:05:10 -35.4 Dark Up 72.6 212.3 Up 11:50:10 - 12:20:10 6454
PNWRO 12:05:08 -35.2 Dark Up 72.7 213.3 Up 11:50:08 - 12:20:08 6450
Ellensburg 12:05:18 -36.3 Dark Up 72.4 207.5 Up 11:50:18 - 12:20:18 6426
Yakima 12:05:16 -36.3 Dark Up 72.8 208.0 Up 11:50:16 - 12:20:16 6396
Toppenish/White Swan 12:05:13 -36.2 Dark Up 72.9 208.8 Up 11:50:13 - 12:20:13 6391
Victoria 12:05:32 -38.0 Dark Up 71.8 198.2 Up 11:50:32 - 12:20:32 6379
Goldendale 12:05:11 -36.6 Dark Up 73.6 208.5 Up 11:50:11 - 12:20:11 6328
The Dalles 12:05:11 -36.8 Dark Up 73.9 207.8 Up 11:50:11 - 12:20:11 6291
Maupin 12:05:11 -36.8 Dark Up 74.2 208.8 Up 11:50:11 - 12:20:11 6267
Redmond 12:05:07 -36.9 Dark Up 75.0 210.1 Up 11:50:07 - 12:20:07 6197
Sisters 12:05:09 -37.2 Dark Up 75.2 208.8 Up 11:50:09 - 12:20:09 6176
Bend 12:05:06 -37.0 Dark Up 75.3 210.0 Up 11:50:06 - 12:20:06 6173
Oregon Observatory 12:05:06 -37.1 Dark Up 75.5 210.0 Up 11:50:06 - 12:20:06 6153
North Lake 12:05:01 -36.7 Dark Up 75.8 212.9 Up 11:50:01 - 12:20:01 6139
La Pine/Gilchrist 12:05:05 -37.2 Dark Up 75.7 210.2 Up 11:50:05 - 12:20:05 6135
Paisley 12:04:57 -36.5 Dark Up 76.1 215.2 Up 11:49:57 - 12:19:57 6120
Lakeview 12:04:56 -36.4 Dark Up 76.5 217.0 Up 11:49:56 - 12:19:56 6095
Cedarville 12:04:51 -36.2 Dark Up 76.9 219.2 Up 11:49:51 - 12:19:51 6058
DCO 12:04:02 -30.4 Dark Down 75.6 257.9 Up 11:49:02 - 12:19:02 6058
George/Scottsdale 12:03:56 -29.1 Dark Down 74.8 264.4 Up 11:48:56 - 12:18:56 6053
Patrick 12:04:04 -31.0 Dark Up 76.1 255.8 Up 11:49:04 - 12:19:04 6031
Klamath Falls 12:05:00 -37.4 Dark Up 77.0 212.3 Up 11:50:00 - 12:20:00 6013
Kingman/Dolan Springs 12:04:06 -31.1 Dark Up 76.3 256.4 Up 11:49:06 - 12:19:06 6002
Henderson 12:04:10 -32.0 Dark Up 76.8 251.6 Up 11:49:10 - 12:19:10 5999
Tonopah 12:04:28 -33.9 Dark Up 77.5 239.0 Up 11:49:28 - 12:19:28 5995
Indian Springs 12:04:17 -32.6 Dark Up 77.1 248.2 Up 11:49:17 - 12:19:17 5990
Laughlin/Bullhead City 12:04:06 -31.5 Dark Up 76.7 255.8 Up 11:49:06 - 12:19:06 5965
Searchlight/Boulder City 12:04:08 -31.8 Dark Up 76.9 254.0 Up 11:49:08 - 12:19:08 5963
Fall River/Burney 12:04:53 -37.2 Dark Up 77.9 216.5 Up 11:49:53 - 12:19:53 5949
Susanville 12:04:48 -36.6 Dark Up 78.0 220.8 Up 11:49:48 - 12:19:48 5948
Mohave Valley 12:04:05 -31.5 Dark Up 76.8 256.9 Up 11:49:05 - 12:19:05 5947
Beatty 12:04:21 -33.4 Dark Up 77.8 244.7 Up 11:49:21 - 12:19:21 5942
Yerington 12:04:36 -35.4 Dark Up 78.2 230.3 Up 11:49:36 - 12:19:36 5937
Hawthorne 12:04:33 -35.0 Dark Up 78.2 233.6 Up 11:49:33 - 12:19:33 5937
Reno 12:04:42 -36.0 Dark Up 78.2 226.3 Up 11:49:42 - 12:19:42 5936
Lake Havasu City 12:04:02 -31.2 Dark Up 76.7 258.9 Up 11:49:02 - 12:19:02 5935
Portola 12:04:46 -36.5 Dark Up 78.4 223.4 Up 11:49:46 - 12:19:46 5915
Gimple 12:04:49 -36.8 Dark Up 78.3 221.0 Up 11:49:49 - 12:19:49 5914
Parker 12:04:00 -31.2 Dark Up 76.8 260.3 Up 11:49:00 - 12:19:00 5912
Carson City 12:04:40 -35.9 Dark Up 78.4 227.7 Up 11:49:40 - 12:19:40 5911
Greenville 12:04:49 -36.8 Dark Up 78.4 220.7 Up 11:49:49 - 12:19:49 5909
Gardnerville 12:04:38 -35.9 Dark Up 78.6 228.7 Up 11:49:38 - 12:19:38 5896
Quincy 12:04:46 -36.8 Dark Up 78.5 221.3 Up 11:49:46 - 12:19:46 5895
Bishop 12:04:28 -34.8 Dark Up 78.7 238.9 Up 11:49:28 - 12:19:28 5868
Lee Vining 12:04:33 -35.4 Dark Up 78.8 234.4 Up 11:49:33 - 12:19:33 5865
Blythe 12:04:00 -31.3 Dark Up 77.1 262.2 Up 11:49:00 - 12:19:00 5855
Yuma 12:03:56 -31.2 Dark Down 77.2 266.2 Up 11:48:56 - 12:18:56 5786
Calipatria 12:04:00 -32.0 Dark Up 77.9 263.5 Up 11:49:00 - 12:19:00 5755
Idyllwild 12:04:06 -33.1 Dark Up 78.8 259.2 Up 11:49:06 - 12:19:06 5717
Wildwood 12:04:14 -34.7 Dark Up 80.2 254.4 Up 11:49:14 - 12:19:14 5615
CPSLO 12:04:26 -36.4 Dark Up 81.3 242.6 Up 11:49:26 - 12:19:26 5568

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 523776, (2026/12/21 12:05UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:22.0 +11:58:02  1.3 21.37  96
PPM 099676     09:33:18.2 +28:22:04  6.4  3.04  82
PPM 074553     09:30:11.9 +31:19:38  7.9  0.96  80
PPM 074501     09:25:59.0 +31:18:57  9.8  0.35  79
523776         09:26:01.8 +30:57:51 11.6        79
Positions are for J2000

Event circumstances last updated at 2020/02/29 01:15:54 UT

Marc W. Buie, Southwest Research Institute

RECON