RECON: TNO occultation with 19255

Event between (19255) 94VK8 and star GA1120:02346560 with event index number of 1388838

Geocentric closest approach at 2025/02/08 08:46:11 UTC

J2000 position of star is 06:39:52.0 +23:49:34
Equinox of date position of star is 06:41:13.3 +23:48:15
Stellar brightness G=15.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 11 degrees from the moon. Moon is 81% illuminated.
TNO apparent brightness V=23.4

[RECON map]
TNO is 42.7 AU from the Sun and 41.9 AU from the Earth.
The TNO is moving 18.6 km/sec on the sky relative to the star, or, 2.2 arcsec/hr.
The 1-sigma error in the time of the event is 2850 seconds.
The 1-sigma cross-track error in the shadow position is 3030 km.
The sky-plane scale is 30418.1 km/arcsec.

The TNO has an absolute magnitude Hv=7.0
Diameter=239.9 km assuming a 5% albedo -- 12.9 sec chord
Diameter=97.9 km assuming a 30% albedo -- 5.3 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 19255, (2025/02/08 08:46UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:51.1 +27:57:49  1.1 15.29  24
Alhena         06:39:09.7 +16:22:33  1.9  7.44  16
PPM 096264     06:38:59.6 +24:34:04  6.5  0.94  10
PPM 096281     06:39:24.1 +23:34:52  7.7  0.51  11
PPM 096343     06:41:43.2 +23:48:55  9.8  0.08  11
19255          06:41:23.7 +23:48:05 15.9        12
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 0.3 sigma about the mid-time.
The median site spacing is 20.4 km RECON observability=1.0 and success probability=6.7%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 08:43:14 -49.1 Dark Up 34.6 265.0 Up 08:28:14 - 08:58:14 7050
Kamloops 08:43:38 -53.7 Dark Up 43.7 253.5 Up 08:28:38 - 08:58:38 6571
Kelowna 08:43:33 -54.4 Dark Up 43.4 255.1 Up 08:28:33 - 08:58:33 6525
Peachland 08:43:33 -54.6 Dark Up 43.6 254.9 Up 08:28:33 - 08:58:33 6508
Summerland 08:43:32 -54.7 Dark Up 43.6 255.1 Up 08:28:32 - 08:58:32 6498
Penticton 08:43:31 -54.8 Dark Up 43.5 255.3 Up 08:28:31 - 08:58:31 6495
Oliver 08:43:30 -55.1 Dark Up 43.6 255.6 Up 08:28:30 - 08:58:30 6465
Anarchist Mountain Observatory 08:43:29 -55.2 Dark Up 43.5 255.9 Up 08:28:29 - 08:58:29 6456
Tonasket 08:43:28 -55.5 Dark Up 43.6 256.1 Up 08:28:28 - 08:58:28 6428
Okanogan 08:43:28 -55.9 Dark Up 43.8 256.3 Up 08:28:28 - 08:58:28 6395
Brewster 08:43:26 -56.2 Dark Up 44.0 256.4 Up 08:28:26 - 08:58:26 6367
Manson/Chelan 08:43:27 -56.5 Dark Up 44.3 256.2 Up 08:28:27 - 08:58:27 6339
Victoria 08:43:37 -56.2 Dark Up 46.2 252.6 Up 08:28:37 - 08:58:37 6313
Wenatchee 08:43:25 -56.9 Dark Up 44.5 256.5 Up 08:28:25 - 08:58:25 6294
Ellensburg 08:43:25 -57.4 Dark Up 44.8 256.7 Up 08:28:25 - 08:58:25 6252
Yakima 08:43:23 -57.8 Dark Up 44.9 257.1 Up 08:28:23 - 08:58:23 6216
PNWRO 08:43:17 -58.1 Dark Up 43.9 259.1 Up 08:28:17 - 08:58:17 6209
Toppenish/White Swan 08:43:22 -58.0 Dark Up 44.8 257.5 Up 08:28:22 - 08:58:22 6201
Goldendale 08:43:21 -58.6 Dark Up 45.2 257.6 Up 08:28:21 - 08:58:21 6142
Dunrhomin 08:42:24 -58.2 Dark Up 34.4 273.5 Up 08:27:24 - 08:57:24 6121
The Dalles 08:43:21 -58.8 Dark Up 45.5 257.5 Up 08:28:21 - 08:58:21 6112
CU-SBO 08:42:24 -58.5 Dark Up 34.5 273.6 Up 08:27:24 - 08:57:24 6096
Maupin 08:43:20 -59.2 Dark Up 45.5 258.0 Up 08:28:20 - 08:58:20 6077
Sisters 08:43:18 -60.2 Dark Up 46.1 258.5 Up 08:28:18 - 08:58:18 5985
Bend 08:43:16 -60.4 Dark Up 45.9 258.9 Up 08:28:16 - 08:58:16 5971
Oregon Observatory 08:43:16 -60.6 Dark Up 46.1 259.0 Up 08:28:16 - 08:58:16 5952
North Lake 08:43:13 -61.1 Dark Up 45.8 260.1 Up 08:28:13 - 08:58:13 5908
Lakeview 08:43:08 -62.0 Dark Up 45.6 261.6 Up 08:28:08 - 08:58:08 5827
Chiloquin 08:43:14 -61.9 Dark Up 46.6 260.0 Up 08:28:14 - 08:58:14 5820
Klamath Falls 08:43:12 -62.2 Dark Up 46.6 260.4 Up 08:28:12 - 08:58:12 5790
Cedarville 08:43:05 -62.6 Dark Up 45.6 262.4 Up 08:28:05 - 08:58:05 5772
Fall River/Burney 08:43:07 -63.3 Dark Up 46.5 262.0 Up 08:28:07 - 08:58:07 5692
Susanville 08:43:03 -63.8 Dark Up 46.1 263.2 Up 08:28:03 - 08:58:03 5654
Gimple 08:43:03 -64.1 Dark Up 46.3 263.3 Up 08:28:03 - 08:58:03 5622
Greenville 08:43:03 -64.1 Dark Up 46.3 263.2 Up 08:28:03 - 08:58:03 5620
Portola 08:43:00 -64.4 Dark Up 46.0 263.9 Up 08:28:00 - 08:58:00 5603
Quincy 08:43:02 -64.3 Dark Up 46.4 263.4 Up 08:28:02 - 08:58:02 5601
Reno 08:42:58 -64.5 Dark Up 45.5 264.6 Up 08:27:58 - 08:57:58 5597
Yerington 08:42:54 -64.9 Dark Up 45.1 265.6 Up 08:27:54 - 08:57:54 5565
Carson City 08:42:56 -64.8 Dark Up 45.6 265.0 Up 08:27:56 - 08:57:56 5564
Gardnerville 08:42:56 -65.0 Dark Up 45.5 265.3 Up 08:27:56 - 08:57:56 5543
Hawthorne 08:42:51 -65.2 Dark Up 44.7 266.5 Up 08:27:51 - 08:57:51 5537
Tonopah 08:42:46 -65.2 Dark Up 43.7 267.8 Up 08:27:46 - 08:57:46 5537
Lee Vining 08:42:50 -65.8 Dark Up 45.1 266.7 Up 08:27:50 - 08:57:50 5469
Indian Springs 08:42:37 -66.0 Dark Up 42.5 270.1 Up 08:27:37 - 08:57:37 5445
Beatty 08:42:40 -66.1 Dark Up 43.3 269.2 Up 08:27:40 - 08:57:40 5442
Bishop 08:42:47 -66.2 Dark Up 44.6 267.7 Up 08:27:47 - 08:57:47 5435
Henderson 08:42:32 -66.2 Dark Up 41.9 271.0 Up 08:27:32 - 08:57:32 5417
Patrick 08:42:28 -66.3 Dark Up 41.0 272.2 Up 08:27:28 - 08:57:28 5395
Kingman/Dolan Springs 08:42:28 -66.6 Dark Up 41.2 272.3 Up 08:27:28 - 08:57:28 5367
Laughlin/Bullhead City 08:42:29 -66.8 Dark Up 41.6 272.0 Up 08:27:29 - 08:57:29 5348
Mohave Valley 08:42:28 -67.0 Dark Up 41.6 272.3 Up 08:27:28 - 08:57:28 5322
George/Scottsdale 08:42:17 -66.7 Dark Up 39.3 274.7 Up 08:27:17 - 08:57:17 5302
Lake Havasu City 08:42:26 -67.3 Dark Up 41.4 272.8 Up 08:27:26 - 08:57:26 5292
Parker 08:42:25 -67.5 Dark Up 41.3 273.1 Up 08:27:25 - 08:57:25 5260
Idyllwild 08:42:30 -68.9 Dark Up 43.3 272.2 Up 08:27:30 - 08:57:30 5141
Calipatria 08:42:25 -68.9 Dark Up 42.3 273.4 Up 08:27:25 - 08:57:25 5121
Wildwood 08:42:38 -69.3 Dark Up 44.8 270.8 Up 08:27:38 - 08:57:38 5114
Yuma 08:42:22 -68.9 Dark Up 41.5 274.2 Up 08:27:22 - 08:57:22 5109

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 19255, (2025/02/08 08:46UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1 15.29  24
Alhena         06:37:42.8 +16:23:57  1.9  7.44  16
PPM 096264     06:37:27.2 +24:35:27  6.5  0.94  10
PPM 096281     06:37:52.4 +23:36:17  7.7  0.51  11
PPM 096343     06:40:11.5 +23:50:24  9.8  0.08  11
19255          06:39:52.0 +23:49:34 15.9        11
Positions are for J2000

Event circumstances last updated at 2022/04/05 23:10:03 UT

Marc W. Buie, Southwest Research Institute

RECON