RECON: TNO occultation with 12VR128

Event between 12VR128 and star GA1200:00384197 with event index number of 2034676

Geocentric closest approach at 2025/12/20 06:36:38 UTC

J2000 position of star is 02:21:13.5 +31:17:56
Equinox of date position of star is 02:22:31.6 +31:23:56
Stellar brightness G=14.3, use SENSEUP=64 with the MallinCam and and exposure time of 1 seconds with the QHY174 camera.
Star is 132 degrees from the moon. Moon is 0% illuminated.
TNO apparent brightness V=21.5

[RECON map]
TNO is 46.8 AU from the Sun and 46.1 AU from the Earth.
The TNO is moving 18.6 km/sec on the sky relative to the star, or, 2.0 arcsec/hr.
The 1-sigma error in the time of the event is 119 seconds.
The 1-sigma cross-track error in the shadow position is 2103 km.
The sky-plane scale is 33437.2 km/arcsec.

The TNO has an absolute magnitude Hv=4.7
Diameter=701.5 km assuming a 5% albedo -- 37.7 sec chord
Diameter=286.4 km assuming a 30% albedo -- 15.4 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 12VR128, (2025/12/20 06:37UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:24.8 +16:33:34  0.8 33.96 157
Hamal          02:08:38.6 +23:35:03  2.0  8.43 127
5 Tri          02:12:56.6 +31:38:51  6.2  2.10 130
PPM 067143     02:17:54.0 +31:09:48  7.9  1.07 131
PPM 067262     02:24:04.9 +31:39:12  9.2  0.37 132
PPM 067246     02:23:12.3 +31:17:02 10.4  0.16 132
12VR128        02:22:45.6 +31:25:00 14.3       132
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 30.5 km RECON observability=1.0 and success probability=26.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kamloops 06:33:48 -58.1 Dark Down 59.5 242.8 Up 06:23:23 - 06:44:14 603
Kelowna 06:33:46 -59.1 Dark Down 59.3 245.1 Up 06:23:21 - 06:44:12 497
Sleaford 06:33:03 -60.8 Dark Down 50.7 256.5 Up 06:22:38 - 06:43:29 496
Peachland 06:33:47 -59.1 Dark Down 59.6 244.9 Up 06:23:22 - 06:44:13 492
Summerland 06:33:48 -59.3 Dark Down 59.6 245.3 Up 06:23:22 - 06:44:13 475
Penticton 06:33:47 -59.3 Dark Down 59.5 245.5 Up 06:23:22 - 06:44:13 465
Victoria 06:34:01 -58.4 Dark Down 62.2 242.3 Up 06:23:36 - 06:44:27 460
Oliver 06:33:48 -59.6 Dark Down 59.7 246.1 Up 06:23:22 - 06:44:13 428
Anarchist Mountain Observatory 06:33:47 -59.8 Dark Down 59.6 246.6 Up 06:23:22 - 06:44:13 405
Tonasket 06:33:48 -60.0 Dark Down 59.8 247.0 Up 06:23:23 - 06:44:14 375
Okanogan 06:33:49 -60.2 Dark Down 60.0 247.3 Up 06:23:24 - 06:44:15 343
Brewster 06:33:50 -60.4 Dark Down 60.2 247.5 Up 06:23:25 - 06:44:16 320
Manson/Chelan 06:33:52 -60.4 Dark Down 60.5 247.5 Up 06:23:26 - 06:44:17 307
Wenatchee 06:33:53 -60.6 Dark Down 60.8 248.0 Up 06:23:28 - 06:44:19 262
Ellensburg 06:33:55 -60.8 Dark Down 61.1 248.5 Up 06:23:29 - 06:44:20 225
Yakima 06:33:56 -61.1 Dark Down 61.3 249.2 Up 06:23:30 - 06:44:21 183
Toppenish/White Swan 06:33:55 -61.4 Dark Down 61.2 249.7 Up 06:23:30 - 06:44:21 156
Goldendale 06:33:58 -61.5 Dark Down 61.7 250.2 Up 06:23:32 - 06:44:23 109
The Dalles 06:33:59 -61.5 Dark Down 62.0 250.2 Up 06:23:34 - 06:44:25 96
PNWRO 06:33:51 -62.3 Dark Down 60.4 252.0 Up 06:23:25 - 06:44:16 78
Maupin 06:34:00 -61.9 Dark Down 62.1 251.0 Up 06:23:34 - 06:44:25 50
Sisters 06:34:03 -62.2 Dark Down 62.7 252.1 Up 06:23:38 - 06:44:29 -28
Bend 06:34:03 -62.5 Dark Down 62.6 252.8 Up 06:23:37 - 06:44:28 -60
Oregon Observatory 06:34:04 -62.5 Dark Down 62.7 253.0 Up 06:23:38 - 06:44:29 -75
North Lake 06:34:03 -63.3 Dark Down 62.5 254.8 Up 06:23:37 - 06:44:28 -157
Chiloquin 06:34:08 -63.2 Dark Down 63.4 255.1 Up 06:23:42 - 06:44:33 -199
Klamath Falls 06:34:08 -63.4 Dark Down 63.4 255.8 Up 06:23:42 - 06:44:33 -237
Lakeview 06:34:03 -64.3 Dark Down 62.4 257.3 Up 06:23:37 - 06:44:28 -283
Cedarville 06:34:03 -64.8 Dark Down 62.4 258.7 Up 06:23:38 - 06:44:29 -356
Fall River/Burney 06:34:09 -64.4 Dark Down 63.4 258.5 Up 06:23:44 - 06:44:35 -370
Susanville 06:34:08 -65.2 Dark Down 62.9 260.4 Up 06:23:42 - 06:44:33 -458
Greenville 06:34:09 -65.2 Dark Down 63.2 260.7 Up 06:23:44 - 06:44:35 -478
Gimple 06:34:09 -65.2 Dark Down 63.1 260.7 Up 06:23:43 - 06:44:34 -480
Quincy 06:34:10 -65.3 Dark Down 63.2 261.1 Up 06:23:44 - 06:44:35 -499
Portola 06:34:08 -65.7 Dark Down 62.9 261.7 Up 06:23:43 - 06:44:34 -526
Reno 06:34:06 -66.2 Dark Down 62.4 262.8 Up 06:23:41 - 06:44:32 -572
Carson City 06:34:07 -66.4 Dark Down 62.5 263.5 Up 06:23:41 - 06:44:32 -610
Gardnerville 06:34:07 -66.6 Dark Down 62.4 264.0 Up 06:23:42 - 06:44:33 -637
Yerington 06:34:05 -67.0 Dark Down 62.0 264.3 Up 06:23:39 - 06:44:30 -649
Hawthorne 06:34:04 -67.6 Dark Down 61.6 265.6 Up 06:23:38 - 06:44:29 -712
Lee Vining 06:34:07 -67.6 Dark Down 62.0 266.3 Up 06:23:41 - 06:44:32 -757
Tonopah 06:33:59 -68.7 Dark Down 60.6 267.4 Up 06:23:34 - 06:44:25 -800
Dunrhomin 06:33:12 -72.4 Dark Down 51.4 271.8 Up 06:22:47 - 06:43:38 -808
Bishop 06:34:05 -68.4 Dark Down 61.5 267.9 Up 06:23:40 - 06:44:31 -840
Beatty 06:34:00 -69.7 Dark Down 60.2 269.8 Up 06:23:34 - 06:44:25 -933
Indian Springs 06:33:56 -70.6 Dark Down 59.4 271.0 Up 06:23:31 - 06:44:22 -995
Henderson 06:33:55 -71.4 Dark Down 58.8 272.2 Up 06:23:29 - 06:44:20 -1069
Patrick 06:33:52 -72.4 Dark Down 57.9 273.8 Up 06:23:26 - 06:44:17 -1162
Laughlin/Bullhead City 06:33:55 -72.1 Dark Down 58.4 273.9 Up 06:23:29 - 06:44:20 -1170
Wildwood 06:34:13 -70.0 Dark Down 61.6 273.9 Up 06:23:48 - 06:44:39 -1171
Kingman/Dolan Springs 06:33:53 -72.5 Dark Down 58.0 274.1 Up 06:23:27 - 06:44:18 -1180
Mohave Valley 06:33:56 -72.3 Dark Down 58.4 274.3 Up 06:23:30 - 06:44:21 -1198
Lake Havasu City 06:33:55 -72.7 Dark Down 58.2 275.1 Up 06:23:30 - 06:44:21 -1246
Idyllwild 06:34:06 -71.5 Dark Down 60.0 275.3 Up 06:23:41 - 06:44:32 -1263
Parker 06:33:56 -72.9 Dark Down 58.1 275.6 Up 06:23:30 - 06:44:21 -1284
Calipatria 06:34:03 -72.6 Dark Down 59.0 276.8 Up 06:23:37 - 06:44:28 -1357
George/Scottsdale 06:33:47 -74.8 Dark Down 56.1 277.3 Up 06:23:22 - 06:44:13 -1386
Yuma 06:34:00 -73.5 Dark Down 58.2 277.8 Up 06:23:35 - 06:44:26 -1425

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 12VR128, (2025/12/20 06:37UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 33.96 157
Hamal          02:07:10.7 +23:27:41  2.0  8.43 127
5 Tri          02:11:25.1 +31:31:35  6.2  2.10 130
PPM 067143     02:16:22.3 +31:02:38  7.9  1.07 131
PPM 067262     02:22:32.5 +31:32:10  9.2  0.37 132
PPM 067246     02:21:40.2 +31:09:58 10.4  0.16 132
12VR128        02:21:13.5 +31:17:56 14.3       132
Positions are for J2000

Event circumstances last updated at 2022/01/07 23:38:56 UT

Marc W. Buie, Southwest Research Institute

RECON