RECON: TNO occultation with 612332

Event between (612332) 02CW224 and star GA1180:02647222 with event index number of 2812592

Geocentric closest approach at 2025/11/21 09:49:17 UTC

J2000 position of star is 06:31:10.0 +29:02:36
Equinox of date position of star is 06:32:35.1 +29:01:34
Stellar brightness G=16.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 155 degrees from the moon. Moon is 1% illuminated.
TNO apparent brightness V=22.4

[RECON map]
TNO is 33.1 AU from the Sun and 32.4 AU from the Earth.
The TNO is moving 18.6 km/sec on the sky relative to the star, or, 2.9 arcsec/hr.
The 1-sigma error in the time of the event is 483 seconds.
The 1-sigma cross-track error in the shadow position is 2013 km.
The sky-plane scale is 23469.6 km/arcsec.

The TNO has an absolute magnitude Hv=7.1
Diameter=224.9 km assuming a 5% albedo -- 12.1 sec chord
Diameter=91.8 km assuming a 30% albedo -- 4.9 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 612332, (2025/11/21 09:49UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:53.9 +27:57:42  1.1 16.30 139
Alhena         06:39:12.4 +16:22:30  1.9 12.73 150
49 Aur         06:36:49.9 +27:59:59  5.0  1.35 154
PPM 096061     06:31:17.9 +28:45:41  7.5  0.42 155
PPM 096110     06:33:23.6 +29:13:48 10.0  0.24 155
612332         06:32:48.7 +29:01:23 16.5       154
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 1.9 sigma about the mid-time.
The median site spacing is 31.2 km RECON observability=1.0 and success probability=28.9%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 09:49:23 -42.7 Dark Down 66.7 189.5 Up 09:34:23 - 10:04:23 1746
Kamloops 09:50:15 -50.9 Dark Down 67.1 157.2 Up 09:35:15 - 10:05:15 1477
Kelowna 09:50:12 -51.0 Dark Down 68.1 158.4 Up 09:35:12 - 10:05:12 1397
Peachland 09:50:13 -51.2 Dark Down 68.1 157.6 Up 09:35:13 - 10:05:13 1384
Summerland 09:50:12 -51.3 Dark Down 68.3 157.7 Up 09:35:12 - 10:05:12 1369
Penticton 09:50:13 -51.3 Dark Down 68.4 157.9 Up 09:35:13 - 10:05:13 1362
Oliver 09:50:12 -51.5 Dark Down 68.7 157.5 Up 09:35:12 - 10:05:12 1325
Anarchist Mountain Observatory 09:50:11 -51.5 Dark Down 68.9 157.8 Up 09:35:11 - 10:05:11 1309
Tonasket 09:50:11 -51.7 Dark Down 69.2 157.3 Up 09:35:11 - 10:05:11 1276
Victoria 09:50:27 -53.8 Dark Down 68.1 148.3 Up 09:35:27 - 10:05:27 1241
Okanogan 09:50:12 -52.0 Dark Down 69.4 156.6 Up 09:35:12 - 10:05:12 1240
Brewster 09:50:13 -52.3 Dark Down 69.6 155.9 Up 09:35:13 - 10:05:13 1210
Manson/Chelan 09:50:14 -52.6 Dark Down 69.7 154.8 Up 09:35:14 - 10:05:14 1186
Wenatchee 09:50:15 -53.0 Dark Down 70.1 153.8 Up 09:35:15 - 10:05:15 1135
Ellensburg 09:50:15 -53.3 Dark Down 70.4 152.7 Up 09:35:15 - 10:05:15 1090
Yakima 09:50:16 -53.6 Dark Down 70.8 152.2 Up 09:35:16 - 10:05:16 1047
Toppenish/White Swan 09:50:15 -53.6 Dark Down 71.0 152.3 Up 09:35:15 - 10:05:15 1025
PNWRO 09:50:09 -53.0 Dark Down 71.8 155.6 Up 09:35:09 - 10:05:09 993
Goldendale 09:50:17 -54.2 Dark Down 71.3 150.5 Up 09:35:17 - 10:05:17 964
The Dalles 09:50:18 -54.5 Dark Down 71.4 149.2 Up 09:35:18 - 10:05:18 938
Maupin 09:50:18 -54.7 Dark Down 71.8 148.8 Up 09:35:18 - 10:05:18 894
Sisters 09:50:20 -55.5 Dark Down 72.4 146.1 Up 09:35:20 - 10:05:20 797
Bend 09:50:18 -55.5 Dark Down 72.7 146.4 Up 09:35:18 - 10:05:18 773
Oregon Observatory 09:50:19 -55.7 Dark Down 72.8 145.7 Up 09:35:19 - 10:05:19 754
North Lake 09:50:17 -55.7 Dark Down 73.5 146.0 Up 09:35:17 - 10:05:17 687
Chiloquin 09:50:21 -56.6 Dark Down 73.6 142.1 Up 09:35:21 - 10:05:21 609
Lakeview 09:50:14 -55.9 Dark Down 74.6 145.4 Up 09:35:14 - 10:05:14 575
Klamath Falls 09:50:20 -56.8 Dark Down 74.0 141.6 Up 09:35:20 - 10:05:20 573
Dunrhomin 09:49:06 -46.3 Dark Down 78.1 201.5 Up 09:34:06 - 10:04:06 528
Cedarville 09:50:13 -56.1 Dark Down 75.2 144.5 Up 09:35:13 - 10:05:13 505
CU-SBO 09:49:07 -46.4 Dark Down 78.3 201.6 Up 09:34:07 - 10:04:07 500
Fall River/Burney 09:50:19 -57.2 Dark Down 75.0 139.9 Up 09:35:19 - 10:05:19 446
Susanville 09:50:15 -57.0 Dark Down 75.9 140.5 Up 09:35:15 - 10:05:15 381
Gimple 09:50:16 -57.3 Dark Down 76.0 139.1 Up 09:35:16 - 10:05:16 350
Greenville 09:50:16 -57.3 Dark Down 75.9 138.9 Up 09:35:16 - 10:05:16 349
Quincy 09:50:16 -57.4 Dark Down 76.1 138.4 Up 09:35:16 - 10:05:16 327
Portola 09:50:14 -57.2 Dark Down 76.4 139.4 Up 09:35:14 - 10:05:14 316
Reno 09:50:11 -56.9 Dark Down 77.0 140.7 Up 09:35:11 - 10:05:11 291
Carson City 09:50:11 -57.0 Dark Down 77.2 139.8 Up 09:35:11 - 10:05:11 252
Yerington 09:50:08 -56.6 Dark Down 77.7 141.3 Up 09:35:08 - 10:05:08 234
Gardnerville 09:50:11 -57.1 Dark Down 77.4 139.2 Up 09:35:11 - 10:05:11 225
Hawthorne 09:50:06 -56.5 Dark Down 78.3 141.8 Up 09:35:06 - 10:05:06 187
Tonopah 09:49:59 -55.7 Dark Down 79.3 145.7 Up 09:34:59 - 10:04:59 146
Lee Vining 09:50:08 -57.1 Dark Down 78.5 138.3 Up 09:35:08 - 10:05:08 122
Bishop 09:50:04 -56.8 Dark Down 79.3 138.9 Up 09:35:04 - 10:05:04 61
Beatty 09:49:56 -55.7 Dark Down 80.5 143.8 Up 09:34:56 - 10:04:56 23
Indian Springs 09:49:51 -55.1 Dark Down 81.2 147.7 Up 09:34:51 - 10:04:51 -4
Henderson 09:49:48 -54.7 Dark Down 82.0 149.3 Up 09:34:48 - 10:04:48 -56
Patrick 09:49:42 -54.0 Dark Down 83.0 153.6 Up 09:34:42 - 10:04:42 -113
Kingman/Dolan Springs 09:49:43 -54.2 Dark Down 83.1 151.6 Up 09:34:43 - 10:04:43 -139
Laughlin/Bullhead City 09:49:45 -54.6 Dark Down 82.9 148.3 Up 09:34:45 - 10:04:45 -147
Mohave Valley 09:49:45 -54.7 Dark Down 83.1 147.1 Up 09:34:45 - 10:04:45 -177
Lake Havasu City 09:49:44 -54.6 Dark Down 83.6 146.8 Up 09:34:44 - 10:04:44 -219
Parker 09:49:43 -54.7 Dark Down 83.9 145.2 Up 09:34:43 - 10:04:43 -257
George/Scottsdale 09:49:31 -52.8 Dark Down 85.1 163.2 Up 09:34:31 - 10:04:31 -276
Wildwood 09:50:04 -58.0 Dark Down 81.4 123.6 Up 09:35:04 - 10:05:04 -300
Idyllwild 09:49:55 -56.7 Dark Down 82.8 129.1 Up 09:34:55 - 10:04:55 -325
Calipatria 09:49:49 -55.9 Dark Down 84.0 131.1 Up 09:34:49 - 10:04:49 -381
Yuma 09:49:44 -55.3 Dark Down 84.8 133.3 Up 09:34:44 - 10:04:44 -420

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 612332, (2025/11/21 09:49UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1 16.30 139
Alhena         06:37:42.8 +16:23:56  1.9 12.73 150
49 Aur         06:35:12.1 +28:01:20  5.0  1.35 154
PPM 096061     06:29:39.5 +28:46:50  7.5  0.42 155
PPM 096110     06:31:44.8 +29:15:01 10.0  0.24 155
612332         06:31:10.0 +29:02:36 16.5       155
Positions are for J2000

Event circumstances last updated at 2022/05/04 23:04:25 UT

Marc W. Buie, Southwest Research Institute

RECON