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 06:41:03.0 +23:48:25
Stellar brightness G=15.9, use SENSEUP=128
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 3027 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         07:46:51.2 +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 19.3 km RECON observability=1.0 and success probability=5.3%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 08:43:32 -54.4 Dark Up 43.3 255.1 Up 08:28:32 - 08:58:32 6530
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
Okanagan Falls 08:43:31 -54.9 Dark Up 43.6 255.4 Up 08:28:31 - 08:58:31 6478
Oliver 08:43:29 -55.1 Dark Up 43.6 255.6 Up 08:28:29 - 08:58:29 6465
Anarchist Mountain Observatory 08:43:29 -55.2 Dark Up 43.5 255.9 Up 08:28:29 - 08:58:29 6455
Oroville 08:43:29 -55.3 Dark Up 43.6 255.9 Up 08:28:29 - 08:58:29 6447
Tonasket 08:43:28 -55.5 Dark Up 43.6 256.1 Up 08:28:28 - 08:58:28 6428
Okanogan 08:43:27 -55.9 Dark Up 43.8 256.3 Up 08:28:27 - 08:58:27 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
Entiat 08:43:26 -56.7 Dark Up 44.4 256.4 Up 08:28:26 - 08:58:26 6318
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
Pasco 08:43:18 -57.9 Dark Up 44.0 258.7 Up 08:28:18 - 08:58:18 6225
Yakima 08:43:23 -57.8 Dark Up 44.9 257.1 Up 08:28:23 - 08:58:23 6216
PNWRO 08:43:16 -58.1 Dark Up 43.9 259.1 Up 08:28:16 - 08:58:16 6209
Toppenish/White Swan 08:43:21 -58.0 Dark Up 44.8 257.5 Up 08:28:21 - 08:58:21 6201
George/Umatilla 08:43:18 -58.2 Dark Up 44.2 258.8 Up 08:28:18 - 08:58:18 6189
Goldendale 08:43:21 -58.6 Dark Up 45.2 257.6 Up 08:28:21 - 08:58:21 6141
The Dalles 08:43:21 -58.8 Dark Up 45.5 257.5 Up 08:28:21 - 08:58:21 6112
Niwot 08:42:24 -58.3 Dark Up 34.4 273.6 Up 08:27:24 - 08:57:24 6108
SwRI 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
Madras/Culver 08:43:18 -59.8 Dark Up 45.7 258.5 Up 08:28:18 - 08:58:18 6027
Redmond 08:43:17 -60.1 Dark Up 45.8 258.9 Up 08:28:17 - 08:58:17 5994
Sisters 08:43:19 -60.2 Dark Up 46.1 258.5 Up 08:28:19 - 08:58:19 5985
Bend 08:43:17 -60.4 Dark Up 45.9 258.9 Up 08:28:17 - 08:58:17 5970
Oregon Observatory 08:43:16 -60.6 Dark Up 46.1 259.0 Up 08:28:16 - 08:58:16 5951
La Pine/Gilchrist 08:43:15 -60.8 Dark Up 46.2 259.2 Up 08:28:15 - 08:58:15 5931
North Lake 08:43:12 -61.1 Dark Up 45.8 260.1 Up 08:28:12 - 08:58:12 5908
Paisley 08:43:10 -61.6 Dark Up 45.6 260.9 Up 08:28:10 - 08:58:10 5868
Lakeview 08:43:07 -62.0 Dark Up 45.6 261.6 Up 08:28:07 - 08:58:07 5826
Chiloquin 08:43:13 -61.9 Dark Up 46.6 260.0 Up 08:28:13 - 08:58:13 5819
Klamath Falls 08:43:12 -62.2 Dark Up 46.6 260.4 Up 08:28:12 - 08:58:12 5790
Tulelake 08:43:10 -62.5 Dark Up 46.4 261.0 Up 08:28:10 - 08:58:10 5774
Cedarville 08:43:05 -62.6 Dark Up 45.6 262.4 Up 08:28:05 - 08:58:05 5771
Fall River/Burney 08:43:07 -63.3 Dark Up 46.5 262.0 Up 08:28:07 - 08:58:07 5691
Susanville 08:43:03 -63.8 Dark Up 46.1 263.2 Up 08:28:03 - 08:58:03 5654
Gimple 08:43:02 -64.1 Dark Up 46.3 263.3 Up 08:28:02 - 08:58:02 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 08:43:03 -64.3 Dark Up 46.3 263.4 Up 08:28:03 - 08:58:03 5601
Reno 08:42:57 -64.5 Dark Up 45.5 264.6 Up 08:27:57 - 08:57:57 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 08:42:55 -65.0 Dark Up 45.5 265.3 Up 08:27:55 - 08:57:55 5542
Hawthorne 08:42:51 -65.2 Dark Up 44.7 266.5 Up 08:27:51 - 08:57:51 5537
Tonopah 08:42:45 -65.2 Dark Up 43.7 267.8 Up 08:27:45 - 08:57:45 5536
Lee Vining 08:42:50 -65.8 Dark Up 45.1 266.7 Up 08:27:50 - 08:57:50 5469
Indian Springs 08:42:36 -66.0 Dark Up 42.5 270.1 Up 08:27:36 - 08:57:36 5445
Beatty 08:42:40 -66.1 Dark Up 43.3 269.2 Up 08:27:40 - 08:57:40 5442
Bishop 08:42:46 -66.2 Dark Up 44.6 267.7 Up 08:27:46 - 08:57:46 5434
Henderson 08:42:33 -66.2 Dark Up 41.9 271.0 Up 08:27:33 - 08:57:33 5417
Patrick 08:42:27 -66.3 Dark Up 41.0 272.2 Up 08:27:27 - 08:57:27 5394
DCO 08:42:24 -66.2 Dark Up 40.4 272.8 Up 08:27:24 - 08:57:24 5389
Lone Pine 08:42:43 -66.8 Dark Up 44.4 268.7 Up 08:27:43 - 08:57:43 5372
Kingman/Dolan Springs 08:42:28 -66.6 Dark Up 41.2 272.3 Up 08:27:28 - 08:57:28 5367
Searchlight/Boulder City 08:42:31 -66.7 Dark Up 41.9 271.6 Up 08:27:31 - 08:57:31 5365
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
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
Blythe 08:42:24 -68.1 Dark Up 41.5 273.4 Up 08:27:24 - 08:57:24 5199
CPSLO 08:42:48 -68.7 Dark Up 46.5 268.4 Up 08:27:48 - 08:57:48 5167
Idyllwild 08:42:31 -68.9 Dark Up 43.3 272.2 Up 08:27:31 - 08:57:31 5140
Calipatria 08:42:26 -68.9 Dark Up 42.3 273.4 Up 08:27:26 - 08:57:26 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         07:45:18.0 +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 2019/06/08 10:05:24 UT

Marc W. Buie, Southwest Research Institute

RECON