RECON: TNO occultation with 524834

Event between (524834) 03YL179 and star GA1120:02408936 with event index number of 2217959

Geocentric closest approach at 2025/02/19 06:22:19 UTC

J2000 position of star is 06:44:16.6 +22:12:01
Equinox of date position of star is 06:45:36.9 +22:10:34
Stellar brightness G=15.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 124 degrees from the moon. Moon is 64% illuminated.
TNO apparent brightness V=23.3

[RECON map]
TNO is 38.7 AU from the Sun and 38.1 AU from the Earth.
The TNO is moving 14.7 km/sec on the sky relative to the star, or, 1.9 arcsec/hr.
The 1-sigma error in the time of the event is 1143 seconds.
The 1-sigma cross-track error in the shadow position is 3431 km.
The sky-plane scale is 27638.7 km/arcsec.

The TNO has an absolute magnitude Hv=7.3
Diameter=208.9 km assuming a 5% albedo -- 14.2 sec chord
Diameter=85.3 km assuming a 30% albedo -- 5.8 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 524834, (2025/02/19 06:22UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:51.2 +27:57:48  1.1 14.98 112
Alhena         06:39:09.8 +16:22:32  1.9  6.00 125
PPM 096308     06:40:36.0 +22:00:23  6.0  1.21 126
PPM 096536     06:48:43.8 +22:09:53  8.2  0.68 124
PPM 096445     06:45:16.1 +22:26:17  9.6  0.29 125
524834         06:45:47.3 +22:10:23 15.7       124
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 0.8 sigma about the mid-time.
The median site spacing is 26.4 km RECON observability=1.0 and success probability=3.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 06:19:56 -47.5 Dark Down 48.6 238.3 Up 06:04:56 - 06:34:56 9917
Kamloops 06:20:49 -44.1 Dark Down 56.3 221.1 Up 06:05:49 - 06:35:49 9532
Kelowna 06:20:42 -45.1 Dark Down 56.5 223.2 Up 06:05:42 - 06:35:42 9471
Peachland 06:20:44 -45.0 Dark Down 56.7 222.9 Up 06:05:44 - 06:35:44 9456
Summerland 06:20:43 -45.2 Dark Down 56.8 223.2 Up 06:05:43 - 06:35:43 9443
Penticton 06:20:43 -45.3 Dark Down 56.8 223.4 Up 06:05:43 - 06:35:43 9439
Oliver 06:20:41 -45.5 Dark Down 57.0 223.8 Up 06:05:41 - 06:35:41 9406
Anarchist Mountain Observatory 06:20:41 -45.8 Dark Down 57.1 224.2 Up 06:05:41 - 06:35:41 9394
Tonasket 06:20:38 -46.0 Dark Down 57.3 224.5 Up 06:05:38 - 06:35:38 9364
Okanogan 06:20:39 -46.1 Dark Down 57.6 224.6 Up 06:05:39 - 06:35:39 9329
Brewster 06:20:39 -46.3 Dark Down 57.9 224.6 Up 06:05:39 - 06:35:39 9300
Victoria 06:20:57 -44.3 Dark Down 59.2 218.6 Up 06:05:57 - 06:35:57 9283
Manson/Chelan 06:20:40 -46.2 Dark Down 58.2 224.3 Up 06:05:40 - 06:35:40 9274
Wenatchee 06:20:40 -46.5 Dark Down 58.6 224.6 Up 06:05:40 - 06:35:40 9227
Ellensburg 06:20:40 -46.7 Dark Down 59.0 224.7 Up 06:05:40 - 06:35:40 9183
Yakima 06:20:38 -47.0 Dark Down 59.3 225.2 Up 06:05:38 - 06:35:38 9144
Toppenish/White Swan 06:20:38 -47.2 Dark Down 59.4 225.7 Up 06:05:38 - 06:35:38 9126
PNWRO 06:20:30 -48.2 Dark Down 58.9 228.3 Up 06:05:30 - 06:35:30 9117
Goldendale 06:20:38 -47.4 Dark Down 60.0 225.7 Up 06:05:38 - 06:35:38 9066
The Dalles 06:20:38 -47.4 Dark Down 60.4 225.4 Up 06:05:38 - 06:35:38 9038
Maupin 06:20:37 -47.7 Dark Down 60.6 226.1 Up 06:05:37 - 06:35:37 8999
Sisters 06:20:37 -48.1 Dark Down 61.5 226.5 Up 06:05:37 - 06:35:37 8904
Bend 06:20:36 -48.4 Dark Down 61.5 227.2 Up 06:05:36 - 06:35:36 8886
Oregon Observatory 06:20:37 -48.4 Dark Down 61.7 227.2 Up 06:05:37 - 06:35:37 8866
Dunrhomin 06:19:08 -58.5 Dark Down 53.2 252.2 Up 06:04:08 - 06:34:08 8859
CU-SBO 06:19:08 -58.6 Dark Down 53.4 252.4 Up 06:04:08 - 06:34:08 8833
North Lake 06:20:32 -49.2 Dark Down 61.8 228.9 Up 06:05:32 - 06:35:32 8813
Chiloquin 06:20:36 -49.1 Dark Down 62.8 228.4 Up 06:05:36 - 06:35:36 8729
Lakeview 06:20:26 -50.2 Dark Down 62.2 231.3 Up 06:05:26 - 06:35:26 8718
Klamath Falls 06:20:33 -49.4 Dark Down 63.0 229.0 Up 06:05:33 - 06:35:33 8696
Cedarville 06:20:25 -50.7 Dark Down 62.5 232.5 Up 06:05:25 - 06:35:25 8656
Fall River/Burney 06:20:30 -50.3 Dark Down 63.5 231.4 Up 06:05:30 - 06:35:30 8585
Susanville 06:20:24 -51.2 Dark Down 63.5 233.5 Up 06:05:24 - 06:35:24 8535
Gimple 06:20:25 -51.2 Dark Down 63.8 233.7 Up 06:05:25 - 06:35:25 8503
Greenville 06:20:24 -51.2 Dark Down 63.8 233.5 Up 06:05:24 - 06:35:24 8502
Quincy 06:20:23 -51.3 Dark Down 63.9 233.8 Up 06:05:23 - 06:35:23 8481
Portola 06:20:21 -51.7 Dark Down 63.7 234.8 Up 06:05:21 - 06:35:21 8477
Reno 06:20:17 -52.2 Dark Down 63.5 236.2 Up 06:05:17 - 06:35:17 8463
Carson City 06:20:16 -52.4 Dark Down 63.6 236.8 Up 06:05:16 - 06:35:16 8427
Yerington 06:20:12 -52.9 Dark Down 63.3 238.1 Up 06:05:12 - 06:35:12 8420
Gardnerville 06:20:15 -52.6 Dark Down 63.7 237.3 Up 06:05:15 - 06:35:15 8403
Hawthorne 06:20:09 -53.5 Dark Down 63.2 239.6 Up 06:05:09 - 06:35:09 8383
Tonopah 06:19:59 -54.7 Dark Down 62.5 242.3 Up 06:04:59 - 06:34:59 8365
Lee Vining 06:20:10 -53.6 Dark Down 63.9 239.9 Up 06:05:10 - 06:35:10 8316
Bishop 06:20:04 -54.4 Dark Down 63.7 241.9 Up 06:05:04 - 06:35:04 8270
Beatty 06:19:55 -55.7 Dark Down 62.7 244.8 Up 06:04:55 - 06:34:55 8257
Indian Springs 06:19:48 -56.5 Dark Down 62.1 246.7 Up 06:04:48 - 06:34:48 8247
Henderson 06:19:43 -57.3 Dark Down 61.8 248.4 Up 06:04:43 - 06:34:43 8207
Patrick 06:19:35 -58.4 Dark Down 61.2 250.7 Up 06:04:35 - 06:34:35 8169
Kingman/Dolan Springs 06:19:36 -58.4 Dark Down 61.4 250.9 Up 06:04:36 - 06:34:36 8142
Laughlin/Bullhead City 06:19:37 -58.1 Dark Down 61.8 250.4 Up 06:04:37 - 06:34:37 8127
Mohave Valley 06:19:37 -58.3 Dark Down 61.9 250.8 Up 06:04:37 - 06:34:37 8100
Lake Havasu City 06:19:35 -58.7 Dark Down 61.8 251.8 Up 06:04:35 - 06:34:35 8064
George/Scottsdale 06:19:21 -60.7 Dark Down 60.1 255.5 Up 06:04:21 - 06:34:21 8043
Parker 06:19:34 -59.0 Dark Down 61.9 252.5 Up 06:04:34 - 06:34:34 8029
Idyllwild 06:19:47 -57.8 Dark Down 63.9 250.7 Up 06:04:47 - 06:34:47 7932
Wildwood 06:19:58 -56.3 Dark Down 65.2 247.8 Up 06:04:58 - 06:34:58 7928
Calipatria 06:19:38 -58.9 Dark Down 63.2 253.1 Up 06:04:38 - 06:34:38 7895
Yuma 06:19:32 -59.7 Dark Down 62.6 254.8 Up 06:04:32 - 06:34:32 7871

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 524834, (2025/02/19 06:22UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1 14.98 112
Alhena         06:37:42.8 +16:23:57  1.9  6.00 125
PPM 096308     06:39:05.3 +22:01:51  6.0  1.21 126
PPM 096536     06:47:13.1 +22:11:38  8.2  0.68 124
PPM 096445     06:43:45.2 +22:27:55  9.6  0.29 125
524834         06:44:16.6 +22:12:01 15.7       124
Positions are for J2000

Event circumstances last updated at 2022/04/05 23:11:30 UT

Marc W. Buie, Southwest Research Institute

RECON