RECON: TNO occultation with 524531

Event between (524531) 02XH91 and star GA1120:03003926 with event index number of 1592694

Geocentric closest approach at 2023/02/13 08:48:12 UTC

J2000 position of star is 08:16:53.2 +23:10:01
Equinox of date position of star is 08:18:11.9 +23:05:49
Stellar brightness G=11.5, use SENSEUP=8 with the MallinCam and and exposure time of 125 milli-seconds with the QHY174 camera.
Star is 110 degrees from the moon. Moon is 53% illuminated.
TNO apparent brightness V=22.4

[RECON map]
TNO is 47.0 AU from the Sun and 46.1 AU from the Earth.
The TNO is moving 23.8 km/sec on the sky relative to the star, or, 2.6 arcsec/hr.
The 1-sigma error in the time of the event is 165 seconds.
The 1-sigma cross-track error in the shadow position is 1834 km.
The sky-plane scale is 33423.5 km/arcsec.

The TNO has an absolute magnitude Hv=5.7
Diameter=444.6 km assuming a 5% albedo -- 18.7 sec chord
Diameter=181.5 km assuming a 30% albedo -- 7.6 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 524531, (2023/02/13 08:50UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:43.7 +27:58:07  1.1  8.62 117
PPM 098486     08:15:03.7 +23:03:59  6.5  0.73 110
PPM 098538     08:17:53.8 +22:52:04  9.2  0.24 110
524531         08:18:15.2 +23:05:39 11.5       109
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 19.5 km RECON observability=1.0 and success probability=2.6%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 08:46:50 -47.4 Dark Up 45.4 247.1 Up 08:32:37 - 09:01:02 6832
Kamloops 08:47:16 -52.2 Dark Down 53.8 231.9 Up 08:33:04 - 09:01:29 6325
Kelowna 08:47:12 -52.8 Dark Down 53.8 233.9 Up 08:32:59 - 09:01:24 6281
Peachland 08:47:13 -53.0 Dark Down 54.1 233.7 Up 08:33:00 - 09:01:25 6264
Summerland 08:47:12 -53.1 Dark Down 54.1 234.0 Up 08:32:59 - 09:01:24 6254
Penticton 08:47:11 -53.2 Dark Down 54.1 234.2 Up 08:32:59 - 09:01:24 6251
Oliver 08:47:10 -53.5 Dark Down 54.3 234.6 Up 08:32:58 - 09:01:23 6221
Anarchist Mountain Observatory 08:47:09 -53.6 Dark Down 54.3 235.0 Up 08:32:57 - 09:01:22 6213
Tonasket 08:47:08 -54.0 Dark Down 54.5 235.3 Up 08:32:56 - 09:01:21 6184
Okanogan 08:47:08 -54.3 Dark Down 54.8 235.5 Up 08:32:55 - 09:01:20 6151
Brewster 08:47:08 -54.6 Dark Down 55.0 235.5 Up 08:32:55 - 09:01:20 6123
Manson/Chelan 08:47:08 -54.9 Dark Down 55.4 235.3 Up 08:32:56 - 09:01:21 6095
Victoria 08:47:18 -54.6 Dark Down 56.7 230.2 Up 08:33:06 - 09:01:31 6061
Wenatchee 08:47:07 -55.4 Dark Down 55.7 235.6 Up 08:32:55 - 09:01:20 6049
Ellensburg 08:47:07 -55.8 Dark Down 56.1 235.9 Up 08:32:54 - 09:01:19 6007
Yakima 08:47:05 -56.2 Dark Down 56.3 236.3 Up 08:32:52 - 09:01:17 5971
PNWRO 08:47:01 -56.5 Dark Down 55.7 239.2 Up 08:32:48 - 09:01:13 5968
Toppenish/White Swan 08:47:05 -56.4 Dark Down 56.4 236.8 Up 08:32:53 - 09:01:18 5957
Dunrhomin 08:46:11 -56.5 Dark Up 48.4 259.8 Up 08:31:58 - 09:00:23 5915
Goldendale 08:47:04 -57.0 Dark Down 56.9 237.0 Up 08:32:52 - 09:01:17 5896
CU-SBO 08:46:10 -56.7 Dark Up 48.5 260.0 Up 08:31:57 - 09:00:22 5891
The Dalles 08:47:05 -57.3 Dark Down 57.2 236.8 Up 08:32:53 - 09:01:18 5865
Maupin 08:47:03 -57.6 Dark Down 57.4 237.5 Up 08:32:51 - 09:01:16 5831
Sisters 08:47:03 -58.6 Dark Down 58.2 238.0 Up 08:32:51 - 09:01:16 5738
Bend 08:47:02 -58.8 Dark Down 58.1 238.7 Up 08:32:49 - 09:01:14 5725
Oregon Observatory 08:47:02 -59.0 Dark Down 58.3 238.7 Up 08:32:49 - 09:01:14 5705
North Lake 08:47:00 -59.5 Dark Down 58.3 240.3 Up 08:32:47 - 09:01:12 5663
Lakeview 08:46:55 -60.4 Dark Down 58.5 242.5 Up 08:32:42 - 09:01:07 5584
Chiloquin 08:47:00 -60.3 Dark Down 59.3 240.0 Up 08:32:47 - 09:01:12 5573
Klamath Falls 08:46:59 -60.6 Dark Down 59.4 240.6 Up 08:32:46 - 09:01:11 5544
Cedarville 08:46:53 -61.0 Dark Down 58.7 243.6 Up 08:32:40 - 09:01:05 5529
Fall River/Burney 08:46:55 -61.7 Dark Down 59.7 242.9 Up 08:32:42 - 09:01:07 5447
Susanville 08:46:52 -62.2 Dark Down 59.5 244.7 Up 08:32:39 - 09:01:04 5411
Gimple 08:46:51 -62.5 Dark Down 59.7 244.9 Up 08:32:39 - 09:01:04 5379
Greenville 08:46:51 -62.5 Dark Down 59.8 244.8 Up 08:32:39 - 09:01:04 5376
Portola 08:46:49 -62.7 Dark Down 59.6 245.9 Up 08:32:37 - 09:01:02 5361
Quincy 08:46:51 -62.7 Dark Down 59.9 245.1 Up 08:32:38 - 09:01:03 5357
Reno 08:46:46 -62.8 Dark Up 59.3 247.0 Up 08:32:34 - 09:00:59 5357
Yerington 08:46:44 -63.2 Dark Up 59.0 248.6 Up 08:32:32 - 09:00:57 5326
Carson City 08:46:46 -63.2 Dark Up 59.4 247.6 Up 08:32:34 - 09:00:59 5324
Tonopah 08:46:37 -63.5 Dark Up 57.9 252.1 Up 08:32:24 - 09:00:49 5303
Gardnerville 08:46:45 -63.4 Dark Up 59.4 248.0 Up 08:32:32 - 09:00:57 5302
Hawthorne 08:46:42 -63.5 Dark Up 58.8 249.9 Up 08:32:30 - 09:00:55 5300
Lee Vining 08:46:41 -64.2 Dark Up 59.3 250.3 Up 08:32:29 - 09:00:54 5231
Indian Springs 08:46:27 -64.3 Dark Up 57.2 255.7 Up 08:32:15 - 09:00:40 5217
Beatty 08:46:31 -64.4 Dark Up 57.9 254.2 Up 08:32:19 - 09:00:44 5210
Bishop 08:46:37 -64.5 Dark Up 59.0 251.9 Up 08:32:24 - 09:00:49 5199
Henderson 08:46:24 -64.5 Dark Up 56.8 257.1 Up 08:32:12 - 09:00:37 5191
Patrick 08:46:19 -64.5 Dark Up 56.0 259.0 Up 08:32:07 - 09:00:32 5171
Kingman/Dolan Springs 08:46:20 -64.8 Dark Up 56.2 259.1 Up 08:32:08 - 09:00:33 5144
Laughlin/Bullhead City 08:46:21 -65.1 Dark Up 56.6 258.8 Up 08:32:09 - 09:00:34 5123
Mohave Valley 08:46:20 -65.3 Dark Up 56.7 259.2 Up 08:32:08 - 09:00:33 5098
George/Scottsdale 08:46:10 -64.9 Dark Up 54.7 262.9 Up 08:31:57 - 09:00:22 5085
Lake Havasu City 08:46:19 -65.5 Dark Up 56.6 260.0 Up 08:32:07 - 09:00:32 5069
Parker 08:46:18 -65.8 Dark Up 56.6 260.5 Up 08:32:06 - 09:00:31 5036
Idyllwild 08:46:24 -67.2 Dark Up 58.6 259.3 Up 08:32:12 - 09:00:37 4912
Calipatria 08:46:19 -67.2 Dark Up 57.8 261.1 Up 08:32:07 - 09:00:32 4895
Yuma 08:46:16 -67.2 Dark Up 57.1 262.4 Up 08:32:03 - 09:00:28 4886
Wildwood 08:46:30 -67.6 Dark Up 60.1 257.1 Up 08:32:18 - 09:00:43 4880

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 524531, (2023/02/13 08:50UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1  8.62 117
PPM 098486     08:13:41.6 +23:08:15  6.5  0.73 110
PPM 098538     08:16:31.9 +22:56:25  9.2  0.24 110
524531         08:16:53.2 +23:10:01 11.5       110
Positions are for J2000

Event circumstances last updated at 2022/03/12 01:53:07 UT

Marc W. Buie, Southwest Research Institute

RECON