RECON: TNO occultation with 12YF12

Event between 12YF12 and star GA0880:01585001 with event index number of 1560876

Geocentric closest approach at 2025/11/26 12:40:24 UTC

J2000 position of star is 06:39:20.0 -00:42:59
Equinox of date position of star is 06:40:19.7 -00:44:07
Stellar brightness G=15.9, use SENSEUP=128
Star is 139 degrees from the moon. Moon is 32% illuminated.
TNO apparent brightness V=22.2

[RECON map]
TNO is 40.8 AU from the Sun and 40.0 AU from the Earth.
The TNO is moving 20.6 km/sec on the sky relative to the star, or, 2.6 arcsec/hr.
The 1-sigma error in the time of the event is 1049 seconds.
The 1-sigma cross-track error in the shadow position is 4994 km.
The sky-plane scale is 29034.5 km/arcsec.

The TNO has an absolute magnitude Hv=6.0
Diameter=382.0 km assuming a 5% albedo -- 18.5 sec chord
Diameter=155.9 km assuming a 30% albedo -- 7.6 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 12YF12, (2025/11/26 12:40UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:34.5 +07:24:35  0.4 13.68 132
Saiph          05:48:59.2 -09:39:44  2.1 15.64 123
PPM 176316     06:34:56.8 -01:14:31  5.1  1.51 137
PPM 176351     06:39:15.6 -00:42:23  8.3  0.35 138
PPM 176363     06:40:55.9 -00:50:53  8.7  0.13 139
PPM 176362     06:40:37.2 -00:47:55 10.9  0.06 138
12YF12         06:40:39.2 -00:44:30 15.9       139
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 0.9 sigma about the mid-time.
The median site spacing is 20.5 km RECON observability=1.0 and success probability=8.3%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 12:37:41 -26.6 Dark Down 30.8 223.1 Up 12:22:41 - 12:52:41 -2113
Summerland 12:37:41 -26.8 Dark Down 31.2 222.9 Up 12:22:41 - 12:52:41 -2133
Penticton 12:37:41 -26.7 Dark Down 31.2 223.0 Up 12:22:41 - 12:52:41 -2140
Okanagan Falls 12:37:41 -26.8 Dark Down 31.3 223.1 Up 12:22:41 - 12:52:41 -2155
Oliver 12:37:40 -26.7 Dark Down 31.4 223.2 Up 12:22:40 - 12:52:40 -2168
Anarchist Mountain Observatory 12:37:39 -26.6 Dark Down 31.5 223.4 Up 12:22:39 - 12:52:39 -2184
Oroville 12:37:40 -26.7 Dark Down 31.5 223.4 Up 12:22:40 - 12:52:40 -2190
Tonasket 12:37:39 -26.6 Dark Down 31.7 223.5 Up 12:22:39 - 12:52:39 -2208
Okanogan 12:37:39 -26.7 Dark Down 32.0 223.5 Up 12:22:39 - 12:52:39 -2234
Brewster 12:37:39 -26.9 Dark Down 32.3 223.4 Up 12:22:39 - 12:52:39 -2253
Manson/Chelan 12:37:40 -27.1 Dark Down 32.6 223.1 Up 12:22:40 - 12:52:40 -2266
Wenatchee 12:37:40 -27.2 Dark Down 33.1 223.1 Up 12:22:40 - 12:52:40 -2302
Ellensburg 12:37:40 -27.3 Dark Down 33.5 223.1 Up 12:22:40 - 12:52:40 -2333
Yakima 12:37:39 -27.3 Dark Down 33.8 223.2 Up 12:22:39 - 12:52:39 -2367
Toppenish/White Swan 12:37:39 -27.2 Dark Down 33.8 223.5 Up 12:22:39 - 12:52:39 -2387
Pasco 12:37:34 -26.3 Dark Down 33.3 224.9 Up 12:22:34 - 12:52:34 -2414
Goldendale 12:37:39 -27.5 Dark Down 34.4 223.3 Up 12:22:39 - 12:52:39 -2428
PNWRO 12:37:34 -26.2 Dark Down 33.4 225.2 Up 12:22:34 - 12:52:34 -2438
George/Umatilla 12:37:35 -26.5 Dark Down 33.7 224.8 Up 12:22:35 - 12:52:35 -2440
The Dalles 12:37:40 -27.7 Dark Down 34.8 223.0 Up 12:22:40 - 12:52:40 -2442
Maupin 12:37:39 -27.6 Dark Down 35.0 223.3 Up 12:22:39 - 12:52:39 -2479
Madras/Culver 12:37:38 -27.6 Dark Down 35.5 223.6 Up 12:22:38 - 12:52:38 -2525
Sisters 12:37:39 -27.9 Dark Down 35.9 223.2 Up 12:22:39 - 12:52:39 -2547
Redmond 12:37:38 -27.6 Dark Down 35.7 223.7 Up 12:22:38 - 12:52:38 -2554
Bend 12:37:38 -27.7 Dark Down 36.0 223.6 Up 12:22:38 - 12:52:38 -2571
Oregon Observatory 12:37:38 -27.8 Dark Down 36.2 223.6 Up 12:22:38 - 12:52:38 -2584
La Pine/Gilchrist 12:37:38 -27.8 Dark Down 36.3 223.6 Up 12:22:38 - 12:52:38 -2601
North Lake 12:37:36 -27.4 Dark Down 36.3 224.5 Up 12:22:36 - 12:52:36 -2647
Chiloquin 12:37:38 -28.0 Dark Down 37.3 223.8 Up 12:22:38 - 12:52:38 -2692
Paisley 12:37:34 -27.1 Dark Down 36.6 225.1 Up 12:22:34 - 12:52:34 -2701
Klamath Falls 12:37:38 -28.0 Dark Down 37.5 224.1 Up 12:22:38 - 12:52:38 -2724
Lakeview 12:37:33 -26.9 Dark Down 36.8 225.6 Up 12:22:33 - 12:52:33 -2748
Tulelake 12:37:36 -27.7 Dark Down 37.6 224.5 Up 12:22:36 - 12:52:36 -2752
Cedarville 12:37:32 -26.7 Dark Down 37.2 226.1 Up 12:22:32 - 12:52:32 -2809
Fall River/Burney 12:37:35 -27.6 Dark Down 38.2 225.1 Up 12:22:35 - 12:52:35 -2834
Susanville 12:37:32 -27.0 Dark Down 38.2 226.3 Up 12:22:32 - 12:52:32 -2902
Greenville 12:37:33 -27.2 Dark Down 38.6 226.1 Up 12:22:33 - 12:52:33 -2922
Gimple 12:37:32 -27.1 Dark Down 38.5 226.2 Up 12:22:32 - 12:52:32 -2924
Quincy 12:37:32 -27.2 Dark Down 38.7 226.2 Up 12:22:32 - 12:52:32 -2941
Portola 12:37:31 -26.8 Dark Down 38.5 226.8 Up 12:22:31 - 12:52:31 -2959
Reno 12:37:28 -26.3 Dark Down 38.3 227.6 Up 12:22:28 - 12:52:28 -2993
Carson City 12:37:28 -26.2 Dark Down 38.6 227.9 Up 12:22:28 - 12:52:28 -3026
Gardnerville 12:37:27 -26.1 Dark Down 38.7 228.1 Up 12:22:27 - 12:52:27 -3050
Yerington 12:37:26 -25.7 Dark Down 38.3 228.6 Up 12:22:26 - 12:52:26 -3054
Hawthorne 12:37:23 -25.2 Dark Down 38.3 229.4 Up 12:22:23 - 12:52:23 -3105
SwRI 12:36:46 -15.5 AT Down 29.1 240.9 Low 12:21:46 - 12:51:46 -3149
Lee Vining 12:37:24 -25.5 Dark Down 39.0 229.3 Up 12:22:24 - 12:52:24 -3150
Tonopah 12:37:18 -24.1 Dark Down 37.8 231.1 Up 12:22:18 - 12:52:18 -3169
Bishop 12:37:21 -24.9 Dark Down 39.0 230.4 Up 12:22:21 - 12:52:21 -3217
Beatty 12:37:15 -23.6 Dark Down 38.2 232.3 Up 12:22:15 - 12:52:15 -3285
Lone Pine 12:37:19 -24.5 Dark Down 39.2 231.2 Up 12:22:19 - 12:52:19 -3293
Indian Springs 12:37:11 -22.7 Dark Down 37.8 233.5 Up 12:22:11 - 12:52:11 -3332
CPSLO 12:37:27 -26.4 Dark Down 41.7 229.4 Up 12:22:27 - 12:52:27 -3376
Henderson 12:37:09 -22.0 Dark Down 37.6 234.5 Up 12:22:09 - 12:52:09 -3393
Searchlight/Boulder City 12:37:08 -21.9 Dark Down 37.9 234.9 Up 12:22:08 - 12:52:08 -3449
Patrick 12:37:04 -21.0 Dark Down 37.2 236.0 Up 12:22:04 - 12:52:04 -3470
Laughlin/Bullhead City 12:37:06 -21.5 Dark Down 37.9 235.5 Up 12:22:06 - 12:52:06 -3483
Kingman/Dolan Springs 12:37:05 -21.1 Dark Down 37.5 235.9 Up 12:22:05 - 12:52:05 -3489
Mohave Valley 12:37:06 -21.5 Dark Down 38.0 235.6 Up 12:22:06 - 12:52:06 -3509
Wildwood 12:37:18 -24.6 Dark Down 41.1 232.3 Up 12:22:18 - 12:52:18 -3525
Lake Havasu City 12:37:05 -21.2 Dark Down 38.1 236.1 Up 12:22:05 - 12:52:05 -3552
Parker 12:37:04 -21.1 Dark Down 38.2 236.4 Up 12:22:04 - 12:52:04 -3587
Idyllwild 12:37:12 -23.0 Dark Down 40.1 234.4 Up 12:22:12 - 12:52:12 -3589
Blythe 12:37:05 -21.3 Dark Down 38.7 236.4 Up 12:22:05 - 12:52:05 -3633
Calipatria 12:37:08 -21.9 Dark Down 39.7 235.9 Up 12:22:08 - 12:52:08 -3667
Yuma 12:37:04 -21.1 Dark Down 39.3 237.0 Up 12:22:04 - 12:52:04 -3724

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 12YF12, (2025/11/26 12:40UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 13.68 132
Saiph          05:47:45.4 -09:40:11  2.1 15.64 123
PPM 176316     06:33:37.9 -01:13:13  5.1  1.51 137
PPM 176351     06:37:56.3 -00:40:56  8.3  0.35 138
PPM 176363     06:39:36.7 -00:49:23  8.7  0.13 139
PPM 176362     06:39:18.0 -00:46:25 10.9  0.06 138
12YF12         06:39:20.0 -00:42:59 15.9       139
Positions are for J2000

Event circumstances last updated at 2019/07/08 22:53:14 UT

Marc W. Buie, Southwest Research Institute

RECON