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 12:02:48 UTC

J2000 position of star is 09:26:01.8 +30:57:51
Equinox of date position of star is 09:27:12.1 +30:52:42
Stellar brightness G=11.6, use SENSEUP=8
Star is 80 degrees from the moon. Moon is 90% illuminated.
TNO apparent brightness V=21.9

[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 506 seconds.
The 1-sigma cross-track error in the shadow position is 5537 km.
The sky-plane scale is 26821.6 km/arcsec.

The TNO has an absolute magnitude Hv=6.1
Diameter=363.1 km assuming a 5% albedo -- 19.6 sec chord
Diameter=148.2 km assuming a 30% albedo -- 8.0 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 523776, (2026/12/21 12:03UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:48.5 +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 1.8 sigma about the mid-time.
The median site spacing is 13.6 km RECON observability=1.0 and success probability=3.3%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Niwot 12:02:06 -25.3 Dark Down 68.6 252.2 Up 11:47:06 - 12:17:06 10188
SwRI 12:02:06 -25.4 Dark Down 68.7 252.4 Up 11:47:06 - 12:17:06 10175
Clarence Fulton 12:03:30 -35.5 Dark Up 69.3 205.2 Up 11:48:30 - 12:18:30 9992
Kelowna 12:03:30 -35.7 Dark Up 69.7 205.3 Up 11:48:30 - 12:18:30 9957
Penticton 12:03:29 -35.7 Dark Up 70.0 205.5 Up 11:48:29 - 12:18:29 9931
Summerland 12:03:29 -35.8 Dark Up 70.0 205.1 Up 11:48:29 - 12:18:29 9930
Okanagan Falls 12:03:29 -35.8 Dark Up 70.2 205.7 Up 11:48:29 - 12:18:29 9917
Oliver 12:03:27 -35.8 Dark Up 70.3 205.9 Up 11:48:27 - 12:18:27 9907
Anarchist Mountain Observatory 12:03:26 -35.7 Dark Up 70.4 206.6 Up 11:48:26 - 12:18:26 9906
Oroville 12:03:25 -35.7 Dark Up 70.5 206.5 Up 11:48:25 - 12:18:25 9896
Tonasket 12:03:24 -35.7 Dark Up 70.7 206.8 Up 11:48:24 - 12:18:24 9881
Okanogan 12:03:23 -35.9 Dark Up 71.1 206.8 Up 11:48:23 - 12:18:23 9850
Brewster 12:03:23 -36.0 Dark Up 71.4 206.7 Up 11:48:23 - 12:18:23 9820
Manson/Chelan 12:03:23 -36.3 Dark Up 71.7 206.0 Up 11:48:23 - 12:18:23 9786
Entiat 12:03:21 -36.3 Dark Up 71.9 206.1 Up 11:48:21 - 12:18:21 9767
Wenatchee 12:03:21 -36.4 Dark Up 72.1 206.2 Up 11:48:21 - 12:18:21 9743
Pasco 12:03:13 -35.7 Dark Up 72.8 211.0 Up 11:48:13 - 12:18:13 9729
PNWRO 12:03:10 -35.6 Dark Up 72.9 212.0 Up 11:48:10 - 12:18:10 9725
Ellensburg 12:03:20 -36.6 Dark Up 72.6 206.2 Up 11:48:20 - 12:18:20 9702
Yakima 12:03:19 -36.7 Dark Up 73.0 206.7 Up 11:48:19 - 12:18:19 9672
Toppenish/White Swan 12:03:18 -36.6 Dark Up 73.1 207.5 Up 11:48:18 - 12:18:18 9667
Goldendale 12:03:16 -36.9 Dark Up 73.7 207.1 Up 11:48:16 - 12:18:16 9604
The Dalles 12:03:17 -37.2 Dark Up 74.0 206.4 Up 11:48:17 - 12:18:17 9567
Maupin 12:03:15 -37.1 Dark Up 74.4 207.4 Up 11:48:15 - 12:18:15 9543
Madras/Culver 12:03:10 -37.2 Dark Up 74.9 208.1 Up 11:48:10 - 12:18:10 9501
Redmond 12:03:12 -37.2 Dark Up 75.2 208.6 Up 11:48:12 - 12:18:12 9472
Sisters 12:03:10 -37.5 Dark Up 75.3 207.3 Up 11:48:10 - 12:18:10 9451
Bend 12:03:09 -37.4 Dark Up 75.5 208.5 Up 11:48:09 - 12:18:09 9449
Oregon Observatory 12:03:08 -37.5 Dark Up 75.7 208.4 Up 11:48:08 - 12:18:08 9428
North Lake 12:03:05 -37.1 Dark Up 76.0 211.4 Up 11:48:05 - 12:18:05 9413
La Pine/Gilchrist 12:03:09 -37.5 Dark Up 75.9 208.6 Up 11:48:09 - 12:18:09 9410
Paisley 12:03:01 -36.9 Dark Up 76.3 213.7 Up 11:48:01 - 12:18:01 9395
Lakeview 12:02:58 -36.7 Dark Up 76.7 215.4 Up 11:47:58 - 12:17:58 9369
Cedarville 12:02:54 -36.6 Dark Up 77.1 217.7 Up 11:47:54 - 12:17:54 9332
DCO 12:02:05 -30.8 Dark Up 76.0 257.3 Up 11:47:05 - 12:17:05 9328
George/Scottsdale 12:01:53 -29.5 Dark Down 75.2 264.0 Up 11:46:53 - 12:16:53 9321
Chiloquin 12:03:07 -37.8 Dark Up 77.0 209.6 Up 11:48:07 - 12:18:07 9307
Patrick 12:02:09 -31.4 Dark Up 76.5 255.1 Up 11:47:09 - 12:17:09 9301
Klamath Falls 12:03:03 -37.8 Dark Up 77.2 210.6 Up 11:48:03 - 12:18:03 9287
Tulelake 12:03:02 -37.6 Dark Up 77.3 212.3 Up 11:48:02 - 12:18:02 9285
Kingman/Dolan Springs 12:02:07 -31.5 Dark Up 76.7 255.7 Up 11:47:07 - 12:17:07 9272
Henderson 12:02:14 -32.3 Dark Up 77.2 250.7 Up 11:47:14 - 12:17:14 9269
Tonopah 12:02:30 -34.3 Dark Up 77.9 237.8 Up 11:47:30 - 12:17:30 9266
Indian Springs 12:02:21 -32.9 Dark Up 77.5 247.3 Up 11:47:21 - 12:17:21 9261
Laughlin/Bullhead City 12:02:08 -31.9 Dark Up 77.1 255.0 Up 11:47:08 - 12:17:08 9235
Searchlight/Boulder City 12:02:10 -32.2 Dark Up 77.3 253.2 Up 11:47:10 - 12:17:10 9233
Fall River/Burney 12:02:56 -37.5 Dark Up 78.1 214.8 Up 11:47:56 - 12:17:56 9222
Susanville 12:02:51 -37.0 Dark Up 78.2 219.2 Up 11:47:51 - 12:17:51 9221
Mohave Valley 12:02:07 -31.9 Dark Up 77.2 256.2 Up 11:47:07 - 12:17:07 9217
Beatty 12:02:23 -33.8 Dark Up 78.1 243.6 Up 11:47:23 - 12:17:23 9213
Yerington 12:02:40 -35.8 Dark Up 78.5 228.8 Up 11:47:40 - 12:17:40 9209
Hawthorne 12:02:38 -35.4 Dark Up 78.5 232.2 Up 11:47:38 - 12:17:38 9209
Reno 12:02:46 -36.3 Dark Up 78.5 224.8 Up 11:47:46 - 12:17:46 9209
Lake Havasu City 12:02:06 -31.6 Dark Up 77.1 258.2 Up 11:47:06 - 12:17:06 9205
Portola 12:02:48 -36.8 Dark Up 78.6 221.7 Up 11:47:48 - 12:17:48 9188
Gimple 12:02:53 -37.1 Dark Up 78.6 219.3 Up 11:47:53 - 12:17:53 9188
Carson City 12:02:44 -36.3 Dark Up 78.7 226.1 Up 11:47:44 - 12:17:44 9184
Greenville 12:02:52 -37.2 Dark Up 78.6 219.0 Up 11:47:52 - 12:17:52 9183
Parker 12:02:03 -31.6 Dark Up 77.1 259.8 Up 11:47:03 - 12:17:03 9182
Gardnerville 12:02:44 -36.3 Dark Up 78.9 227.1 Up 11:47:44 - 12:17:44 9169
Quincy 12:02:52 -37.2 Dark Up 78.8 219.6 Up 11:47:52 - 12:17:52 9168
Bishop 12:02:30 -35.1 Dark Up 79.0 237.5 Up 11:47:30 - 12:17:30 9140
Lee Vining 12:02:35 -35.7 Dark Up 79.1 232.9 Up 11:47:35 - 12:17:35 9137
Blythe 12:02:01 -31.7 Dark Up 77.5 261.7 Up 11:47:01 - 12:17:01 9124
Lone Pine 12:02:27 -34.8 Dark Up 79.2 241.8 Up 11:47:27 - 12:17:27 9106
Yuma 12:01:57 -31.6 Dark Up 77.6 265.8 Up 11:46:57 - 12:16:57 9056
Calipatria 12:02:03 -32.4 Dark Up 78.3 263.0 Up 11:47:03 - 12:17:03 9024
Idyllwild 12:02:07 -33.5 Dark Up 79.2 258.6 Up 11:47:07 - 12:17:07 8987
Wildwood 12:02:16 -35.1 Dark Up 80.6 253.5 Up 11:47:16 - 12:17:16 8885
CPSLO 12:02:31 -36.8 Dark Up 81.6 241.1 Up 11:47:31 - 12:17:31 8839

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 12:03UT)
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 2019/09/02 20:55:52 UT

Marc W. Buie, Southwest Research Institute

RECON