RECON: TNO occultation with 12UV177

Event between 12UV177 and star GA1180:00625121 with event index number of 2307556

Geocentric closest approach at 2025/12/10 04:52:49 UTC

J2000 position of star is 03:51:26.3 +29:09:43
Equinox of date position of star is 03:52:48.9 +29:13:40
Stellar brightness G=13.9, use SENSEUP=64 with the MallinCam and and exposure time of 1 seconds with the QHY174 camera.
Star is 87 degrees from the moon. Moon is 67% illuminated.
TNO apparent brightness V=23.8

[RECON map]
TNO is 28.5 AU from the Sun and 27.6 AU from the Earth.
The TNO is moving 23.8 km/sec on the sky relative to the star, or, 4.3 arcsec/hr.
The 1-sigma error in the time of the event is 241 seconds.
The 1-sigma cross-track error in the shadow position is 3085 km.
The sky-plane scale is 20002.5 km/arcsec.

The TNO has an absolute magnitude Hv=9.2
Diameter=87.5 km assuming a 5% albedo -- 3.7 sec chord
Diameter=35.7 km assuming a 30% albedo -- 1.5 sec chord
Dynamical classification is 1:1
 
 
 
 
 
 

Star training set for 12UV177, (2025/12/10 04:53UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:24.7 +16:33:34  0.8 16.26  79
44Zet Per      03:55:46.2 +31:57:31  2.8  2.78  85
PPM 068850     03:53:42.1 +31:14:39  6.3  2.01  86
PPM 092964     03:51:46.4 +29:43:17  7.9  0.56  87
PPM 093006     03:53:45.3 +29:41:13  9.1  0.47  86
PPM 092982     03:52:46.0 +29:11:01 10.9  0.08  87
12UV177        03:53:02.5 +29:14:19 13.9        86
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 3.7 sigma about the mid-time.
The median site spacing is 26.2 km RECON observability=1.0 and success probability=4.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kamloops 04:53:26 -45.5 Dark Down 61.1 128.4 Up 04:38:26 - 05:08:26 8059
Victoria 04:53:39 -44.3 Dark Down 60.7 120.9 Up 04:38:39 - 05:08:39 7997
Peachland 04:53:27 -46.2 Dark Down 62.0 128.0 Up 04:38:27 - 05:08:27 7962
Kelowna 04:53:25 -46.3 Dark Down 62.1 128.6 Up 04:38:25 - 05:08:25 7960
Summerland 04:53:26 -46.3 Dark Down 62.1 127.9 Up 04:38:26 - 05:08:26 7946
Penticton 04:53:27 -46.4 Dark Down 62.2 127.9 Up 04:38:27 - 05:08:27 7937
Oliver 04:53:28 -46.5 Dark Down 62.5 127.4 Up 04:38:28 - 05:08:28 7907
Anarchist Mountain Observatory 04:53:28 -46.7 Dark Down 62.7 127.5 Up 04:38:28 - 05:08:28 7886
Tonasket 04:53:28 -46.7 Dark Down 62.8 126.9 Up 04:38:28 - 05:08:28 7863
Okanogan 04:53:31 -46.8 Dark Down 62.9 126.1 Up 04:38:31 - 05:08:31 7840
Brewster 04:53:32 -46.7 Dark Down 63.0 125.4 Up 04:38:32 - 05:08:32 7825
Manson/Chelan 04:53:34 -46.6 Dark Down 62.9 124.5 Up 04:38:34 - 05:08:34 7822
Wenatchee 04:53:35 -46.6 Dark Down 63.1 123.5 Up 04:38:35 - 05:08:35 7788
Ellensburg 04:53:38 -46.6 Dark Down 63.2 122.5 Up 04:38:38 - 05:08:38 7762
Yakima 04:53:39 -46.7 Dark Down 63.4 121.8 Up 04:38:39 - 05:08:39 7728
Sleaford 04:52:47 -52.5 Dark Up 65.6 155.3 Up 04:37:47 - 05:07:47 7712
Toppenish/White Swan 04:53:38 -46.9 Dark Down 63.6 121.7 Up 04:38:38 - 05:08:38 7704
Goldendale 04:53:42 -46.8 Dark Down 63.6 120.1 Up 04:38:42 - 05:08:42 7674
The Dalles 04:53:42 -46.6 Dark Down 63.5 119.2 Up 04:38:42 - 05:08:42 7669
Maupin 04:53:43 -46.8 Dark Down 63.8 118.6 Up 04:38:43 - 05:08:43 7629
PNWRO 04:53:37 -48.0 Dark Down 64.7 123.3 Up 04:38:37 - 05:08:37 7614
Sisters 04:53:47 -46.7 Dark Down 63.9 116.4 Up 04:38:47 - 05:08:47 7574
Bend 04:53:47 -46.9 Dark Down 64.2 116.3 Up 04:38:47 - 05:08:47 7543
Oregon Observatory 04:53:47 -46.9 Dark Down 64.2 115.8 Up 04:38:47 - 05:08:47 7534
North Lake 04:53:48 -47.4 Dark Down 64.8 115.3 Up 04:38:48 - 05:08:48 7456
Chiloquin 04:53:53 -46.9 Dark Down 64.5 112.8 Up 04:38:53 - 05:08:53 7437
Klamath Falls 04:53:53 -47.0 Dark Down 64.6 112.2 Up 04:38:53 - 05:08:53 7404
Lakeview 04:53:49 -48.0 Dark Down 65.6 114.0 Up 04:38:49 - 05:08:49 7341
Fall River/Burney 04:53:55 -47.5 Dark Down 65.3 110.4 Up 04:38:55 - 05:08:55 7285
Cedarville 04:53:51 -48.3 Dark Down 66.0 112.9 Up 04:38:51 - 05:08:51 7276
Susanville 04:53:55 -48.2 Dark Down 66.1 110.0 Up 04:38:55 - 05:08:55 7198
Greenville 04:53:57 -48.0 Dark Down 66.0 109.0 Up 04:38:57 - 05:08:57 7186
Gimple 04:53:57 -48.1 Dark Down 66.0 109.1 Up 04:38:57 - 05:08:57 7182
Quincy 04:53:57 -48.1 Dark Down 66.0 108.6 Up 04:38:57 - 05:08:57 7168
Portola 04:53:57 -48.4 Dark Down 66.4 108.9 Up 04:38:57 - 05:08:57 7136
Reno 04:53:56 -49.0 Dark Down 67.0 109.1 Up 04:38:56 - 05:08:56 7085
Carson City 04:53:57 -49.1 Dark Down 67.1 108.4 Up 04:38:57 - 05:08:57 7051
Gardnerville 04:53:57 -49.1 Dark Down 67.2 107.9 Up 04:38:57 - 05:08:57 7027
Yerington 04:53:55 -49.6 Dark Down 67.7 108.7 Up 04:38:55 - 05:08:55 7006
Hawthorne 04:53:55 -50.1 Dark Down 68.2 108.2 Up 04:38:55 - 05:08:55 6941
Lee Vining 04:53:58 -49.8 Dark Down 68.0 106.3 Up 04:38:58 - 05:08:58 6911
Tonopah 04:53:53 -51.2 Dark Down 69.4 108.9 Up 04:38:53 - 05:08:53 6838
Bishop 04:53:58 -50.4 Dark Down 68.7 105.7 Up 04:38:58 - 05:08:58 6825
Beatty 04:53:54 -51.8 Dark Down 70.1 106.5 Up 04:38:54 - 05:08:54 6711
Indian Springs 04:53:51 -52.7 Dark Down 71.0 106.9 Up 04:38:51 - 05:08:51 6634
Dunrhomin 04:53:10 -59.3 Dark Down 75.9 138.8 Up 04:38:10 - 05:08:10 6575
CU-SBO 04:53:11 -59.4 Dark Down 76.1 137.9 Up 04:38:11 - 05:08:11 6554
Henderson 04:53:50 -53.3 Dark Down 71.7 106.3 Up 04:38:50 - 05:08:50 6554
Wildwood 04:54:06 -50.7 Dark Down 69.2 97.2 Up 04:39:06 - 05:09:06 6531
Laughlin/Bullhead City 04:53:52 -53.8 Dark Down 72.2 104.2 Up 04:38:52 - 05:08:52 6454
Patrick 04:53:48 -54.3 Dark Down 72.7 105.8 Up 04:38:48 - 05:08:48 6447
Kingman/Dolan Springs 04:53:49 -54.2 Dark Down 72.6 104.9 Up 04:38:49 - 05:08:49 6434
Mohave Valley 04:53:52 -53.9 Dark Down 72.3 103.4 Up 04:38:52 - 05:08:52 6428
Idyllwild 04:54:01 -52.3 Dark Down 70.8 97.8 Up 04:39:01 - 05:09:01 6412
Lake Havasu City 04:53:53 -54.1 Dark Down 72.6 102.5 Up 04:38:53 - 05:08:53 6379
Parker 04:53:52 -54.2 Dark Down 72.7 101.4 Up 04:38:52 - 05:08:52 6344
Calipatria 04:54:00 -53.3 Dark Down 71.9 97.1 Up 04:39:00 - 05:09:00 6301
Yuma 04:53:56 -54.1 Dark Down 72.7 96.5 Up 04:38:56 - 05:08:56 6220
George/Scottsdale 04:53:46 -56.2 Dark Down 74.7 102.7 Up 04:38:46 - 05:08:46 6199

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 12UV177, (2025/12/10 04:53UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 16.26  79
44Zet Per      03:54:07.9 +31:53:01  2.8  2.78  85
PPM 068850     03:52:04.4 +31:10:06  6.3  2.01  86
PPM 092964     03:50:10.0 +29:38:39  7.9  0.56  87
PPM 093006     03:52:08.7 +29:36:39  9.1  0.47  86
PPM 092982     03:51:09.9 +29:06:26 10.9  0.08  87
12UV177        03:51:26.3 +29:09:43 13.9        87
Positions are for J2000

Event circumstances last updated at 2022/04/11 23:08:11 UT

Marc W. Buie, Southwest Research Institute

RECON