RECON: TNO occultation with 523746

Event between (523746) 14UT114 and star GA1200:02958449 with event index number of 2323171

Geocentric closest approach at 2025/02/21 06:33:30 UTC

J2000 position of star is 07:19:25.3 +30:19:07
Equinox of date position of star is 07:20:58.0 +30:16:19
Stellar brightness G=16.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 142 degrees from the moon. Moon is 45% illuminated.
Apparent brightness V=21.2

[RECON map]
Object is 16.6 AU from the Sun and 15.9 AU from the Earth.
Apparent velocity is 13.8 km/sec on the sky relative to the star, or, 4.3 arcsec/hr.
The 1-sigma error in the time of the event is 58 seconds.
The 1-sigma cross-track error in the shadow position is 612 km.
The sky-plane scale is 11527.8 km/arcsec.

The object has an absolute magnitude Hv=8.8
Diameter=95.5 km assuming a 5% albedo -- 7.6 sec chord
Diameter=39.0 km assuming a 30% albedo -- 3.1 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 523746, (2025/02/21 06:42UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:51.2 +27:57:48  1.1  6.10 136
PPM 072652     07:19:40.3 +30:54:31  6.0  0.70 142
PPM 072660     07:20:02.4 +30:46:38  8.4  0.55 142
PPM 072687     07:22:10.7 +30:12:00 10.0  0.26 142
523746         07:21:01.0 +30:16:14 16.6       142
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 37.9 km RECON observability=1.0 and success probability=0.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 06:30:18 -47.3 Dark Down 57.3 241.3 Up 06:24:59 - 06:35:36 -857
Kamloops 06:31:22 -44.5 Dark Down 65.2 222.2 Up 06:26:04 - 06:36:41 -1020
Kelowna 06:31:17 -45.5 Dark Down 65.4 224.9 Up 06:25:58 - 06:36:35 -1109
Peachland 06:31:19 -45.5 Dark Down 65.6 224.6 Up 06:26:00 - 06:36:37 -1120
Summerland 06:31:18 -45.6 Dark Down 65.6 225.0 Up 06:26:00 - 06:36:37 -1136
Penticton 06:31:18 -45.7 Dark Down 65.6 225.3 Up 06:25:59 - 06:36:36 -1143
Oliver 06:31:18 -46.0 Dark Down 65.9 225.8 Up 06:25:59 - 06:36:36 -1181
Anarchist Mountain Observatory 06:31:17 -46.2 Dark Down 65.9 226.5 Up 06:25:58 - 06:36:35 -1199
Victoria 06:31:37 -44.9 Dark Down 68.1 219.8 Up 06:26:18 - 06:36:55 -1234
Okanogan 06:31:18 -46.6 Dark Down 66.5 227.1 Up 06:25:59 - 06:36:36 -1268
Brewster 06:31:18 -46.8 Dark Down 66.7 227.2 Up 06:26:00 - 06:36:37 -1296
Manson/Chelan 06:31:20 -46.8 Dark Down 67.1 226.9 Up 06:26:02 - 06:36:39 -1317
Wenatchee 06:31:21 -47.1 Dark Down 67.5 227.5 Up 06:26:03 - 06:36:40 -1367
Ellensburg 06:31:22 -47.3 Dark Down 67.9 227.8 Up 06:26:04 - 06:36:41 -1411
Yakima 06:31:22 -47.6 Dark Down 68.1 228.5 Up 06:26:04 - 06:36:41 -1455
Toppenish/White Swan 06:31:21 -47.9 Dark Down 68.2 229.2 Up 06:26:02 - 06:36:39 -1478
PNWRO 06:31:13 -48.8 Dark Down 67.6 232.6 Up 06:25:55 - 06:36:32 -1523
The Dalles 06:31:25 -48.1 Dark Down 69.1 229.3 Up 06:26:07 - 06:36:44 -1559
Maupin 06:31:25 -48.5 Dark Down 69.3 230.3 Up 06:26:06 - 06:36:43 -1605
Sisters 06:31:27 -48.9 Dark Down 70.2 231.3 Up 06:26:09 - 06:36:46 -1698
Bend 06:31:26 -49.2 Dark Down 70.2 232.3 Up 06:26:08 - 06:36:45 -1725
Oregon Observatory 06:31:27 -49.2 Dark Down 70.3 232.4 Up 06:26:08 - 06:36:45 -1743
Chiloquin 06:31:29 -50.0 Dark Down 71.4 234.7 Up 06:26:10 - 06:36:47 -1884
Klamath Falls 06:31:28 -50.3 Dark Down 71.5 235.7 Up 06:26:10 - 06:36:47 -1922
Cedarville 06:31:20 -51.6 Dark Down 70.9 240.3 Up 06:26:01 - 06:36:38 -2006
Fall River/Burney 06:31:27 -51.3 Dark Down 71.9 239.4 Up 06:26:08 - 06:36:45 -2053
Dunrhomin 06:29:57 -58.6 Dark Down 60.8 260.8 Up 06:24:38 - 06:35:15 -2123
Nikitin 06:29:57 -58.8 Dark Down 60.9 261.1 Up 06:24:38 - 06:35:15 -2143
CU-SBO 06:29:57 -58.8 Dark Down 60.9 261.2 Up 06:24:38 - 06:35:15 -2151
Greenville 06:31:24 -52.2 Dark Down 72.0 242.6 Up 06:26:06 - 06:36:43 -2155
Gimple 06:31:24 -52.2 Dark Down 72.0 242.7 Up 06:26:05 - 06:36:42 -2156
Quincy 06:31:24 -52.3 Dark Down 72.1 243.2 Up 06:26:05 - 06:36:42 -2177
Portola 06:31:22 -52.7 Dark Down 71.9 244.3 Up 06:26:03 - 06:36:40 -2193
Reno 06:31:17 -53.2 Dark Down 71.5 246.0 Up 06:25:58 - 06:36:35 -2225
Carson City 06:31:18 -53.5 Dark Down 71.7 247.1 Up 06:25:59 - 06:36:36 -2265
Yerington 06:31:14 -53.9 Dark Down 71.3 248.5 Up 06:25:55 - 06:36:32 -2289
Gardnerville 06:31:17 -53.7 Dark Down 71.7 247.8 Up 06:25:59 - 06:36:36 -2292
Hawthorne 06:31:11 -54.5 Dark Down 71.1 250.6 Up 06:25:53 - 06:36:30 -2342
Lee Vining 06:31:13 -54.7 Dark Down 71.6 251.5 Up 06:25:55 - 06:36:32 -2403
Bishop 06:31:09 -55.5 Dark Down 71.3 254.1 Up 06:25:51 - 06:36:28 -2471
Beatty 06:31:00 -56.7 Dark Down 70.1 257.3 Up 06:25:42 - 06:36:19 -2526
Patrick 06:30:43 -59.3 Dark Down 68.1 263.8 Up 06:25:24 - 06:36:01 -2692
Laughlin/Bullhead City 06:30:47 -59.2 Dark Down 68.7 263.8 Up 06:25:28 - 06:36:05 -2720
Lake Havasu City 06:30:45 -59.8 Dark Down 68.6 265.7 Up 06:25:27 - 06:36:04 -2794
Wildwood 06:31:11 -57.6 Dark Down 72.1 263.6 Up 06:25:53 - 06:36:30 -2832
Idyllwild 06:30:59 -59.0 Dark Down 70.6 266.1 Up 06:25:41 - 06:36:18 -2877
George/Scottsdale 06:30:30 -61.7 Dark Down 66.6 269.2 Up 06:25:12 - 06:35:49 -2877
Calipatria 06:30:52 -60.1 Dark Down 69.6 268.5 Up 06:25:34 - 06:36:11 -2946
Yuma 06:30:47 -60.9 Dark Down 68.9 270.2 Up 06:25:28 - 06:36:05 -2994

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 523746, (2025/02/21 06:42UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1  6.10 136
PPM 072652     07:18:04.1 +30:57:21  6.0  0.70 142
PPM 072660     07:18:26.2 +30:49:29  8.4  0.55 142
PPM 072687     07:20:35.1 +30:14:55 10.0  0.26 142
523746         07:19:25.3 +30:19:07 16.6       142
Positions are for J2000

Event circumstances last updated at 2024/05/05 03:30:17 UT

Marc W. Buie, Southwest Research Institute

RECON