RECON: TNO occultation with 12UD178

Event between 12UD178 and star GA1160:01748206 with event index number of 1749196

Geocentric closest approach at 2027/08/24 10:41:44 UTC

J2000 position of star is 05:57:55.2 +26:35:07
Equinox of date position of star is 05:59:12.4 +26:35:09
Stellar brightness G=15.9, use SENSEUP=128
Star is 37 degrees from the moon. Moon is 57% illuminated.
TNO apparent brightness V=26.0

[RECON map]
TNO is 38.2 AU from the Sun and 38.7 AU from the Earth.
The TNO is moving 19.2 km/sec on the sky relative to the star, or, 2.5 arcsec/hr.
The 1-sigma error in the time of the event is 1099 seconds.
The 1-sigma cross-track error in the shadow position is 4631 km.
The sky-plane scale is 28047.9 km/arcsec.

The TNO has an absolute magnitude Hv=10.0
Diameter=201.4 km assuming a 5% albedo -- 3.1 sec chord
Diameter=82.2 km assuming a 30% albedo -- 1.3 sec chord
Dynamical classification is 5:2EEE
 
 
 
 
 
 

Star training set for 12UD178, (2027/08/24 10:42UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:40.2 +07:24:35  0.4 19.19  41
Alnath         05:28:02.5 +28:37:42  1.6  7.29  30
139 Tau        05:59:42.6 +25:57:17  4.7  0.63  37
PPM 095183     06:00:35.7 +25:46:37  7.7  0.84  37
PPM 095137     05:59:03.0 +26:51:17  9.0  0.30  36
PPM 095168     06:00:12.6 +26:48:38 10.7  0.26  37
12UD178        05:59:38.7 +26:35:10 15.9        37
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 0.8 sigma about the mid-time.
The median site spacing is 17.9 km RECON observability=1.0 and success probability=8.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Victoria 10:38:32 -22.6 Dark Up 25.5 77.9 Low 10:23:32 - 10:53:32 3587
Clarence Fulton 10:38:42 -19.5 Dark Up 28.4 81.7 Low 10:23:42 - 10:53:42 3556
Peachland 10:38:40 -20.1 Dark Up 28.1 81.1 Low 10:23:40 - 10:53:40 3540
Kelowna 10:38:40 -19.9 Dark Up 28.3 81.4 Low 10:23:40 - 10:53:40 3537
Summerland 10:38:39 -20.2 Dark Up 28.1 81.1 Low 10:23:39 - 10:53:39 3528
Penticton 10:38:39 -20.2 Dark Up 28.2 81.1 Low 10:23:39 - 10:53:39 3520
Oliver 10:38:37 -20.5 Dark Up 28.1 80.9 Low 10:23:37 - 10:53:37 3498
Anarchist Mountain Observatory 10:38:37 -20.5 Dark Up 28.2 81.0 Low 10:23:37 - 10:53:37 3481
Tonasket 10:38:35 -20.8 Dark Up 28.1 80.8 Low 10:23:35 - 10:53:35 3463
Okanogan 10:38:33 -21.1 Dark Up 28.0 80.5 Low 10:23:33 - 10:53:33 3447
Brewster 10:38:32 -21.4 Dark Up 27.8 80.2 Low 10:23:32 - 10:53:32 3436
Manson/Chelan 10:38:31 -21.7 Dark Up 27.5 79.8 Low 10:23:31 - 10:53:31 3436
Entiat 10:38:30 -21.9 Dark Up 27.4 79.7 Low 10:23:30 - 10:53:30 3424
Wenatchee 10:38:28 -22.1 Dark Up 27.3 79.5 Low 10:23:28 - 10:53:28 3411
Ellensburg 10:38:27 -22.5 Dark Up 27.1 79.1 Low 10:23:27 - 10:53:27 3392
Yakima 10:38:25 -22.9 Dark Up 27.0 78.9 Low 10:23:25 - 10:53:25 3366
Toppenish/White Swan 10:38:24 -22.9 Dark Up 27.0 78.9 Low 10:23:24 - 10:53:24 3346
Goldendale 10:38:21 -23.6 Dark Up 26.6 78.3 Low 10:23:21 - 10:53:21 3325
The Dalles 10:38:20 -23.9 Dark Up 26.3 78.0 Low 10:23:20 - 10:53:20 3323
Pasco 10:38:24 -22.4 Dark Up 27.9 79.7 Low 10:23:24 - 10:53:24 3293
Maupin 10:38:18 -24.2 Dark Up 26.3 77.8 Low 10:23:18 - 10:53:18 3291
PNWRO 10:38:23 -22.5 Dark Up 28.0 79.7 Low 10:23:23 - 10:53:23 3268
Sisters 10:38:13 -25.1 Dark Up 25.8 77.1 Low 10:23:13 - 10:53:13 3250
Redmond 10:38:14 -24.9 Dark Up 26.0 77.3 Low 10:23:14 - 10:53:14 3234
Bend 10:38:12 -25.1 Dark Up 25.9 77.1 Low 10:23:12 - 10:53:12 3225
Oregon Observatory 10:38:12 -25.3 Dark Up 25.7 77.0 Low 10:23:12 - 10:53:12 3218
La Pine/Gilchrist 10:38:11 -25.5 Dark Up 25.7 76.8 Low 10:23:11 - 10:53:11 3206
North Lake 10:38:09 -25.5 Dark Up 26.0 77.0 Low 10:23:09 - 10:53:09 3153
Klamath Falls 10:38:05 -26.7 Dark Up 25.1 76.0 Low 10:23:05 - 10:53:05 3115
Paisley 10:38:07 -25.8 Dark Up 26.1 76.9 Low 10:23:07 - 10:53:07 3101
Lakeview 10:38:05 -26.1 Dark Up 26.1 76.8 Low 10:23:05 - 10:53:05 3058
Fall River/Burney 10:38:00 -27.4 Dark Up 25.1 75.7 Low 10:23:00 - 10:53:00 3017
Cedarville 10:38:03 -26.5 Dark Up 26.1 76.6 Low 10:23:03 - 10:53:03 3005
Susanville 10:37:57 -27.5 Dark Up 25.5 75.8 Low 10:22:57 - 10:52:57 2943
Greenville 10:37:55 -27.9 Dark Up 25.2 75.5 Low 10:22:55 - 10:52:55 2934
Gimple 10:37:56 -27.8 Dark Up 25.2 75.5 Low 10:22:56 - 10:52:56 2931
Quincy 10:37:56 -28.0 Dark Up 25.1 75.4 Low 10:22:56 - 10:52:56 2919
Portola 10:37:55 -27.9 Dark Up 25.4 75.6 Low 10:22:55 - 10:52:55 2891
Reno 10:37:54 -27.7 Dark Up 25.9 75.8 Low 10:22:54 - 10:52:54 2846
Carson City 10:37:53 -28.0 Dark Up 25.8 75.7 Low 10:22:53 - 10:52:53 2818
Gardnerville 10:37:53 -28.1 Dark Up 25.8 75.6 Low 10:22:53 - 10:52:53 2798
Yerington 10:37:53 -27.8 Dark Up 26.2 75.9 Low 10:22:53 - 10:52:53 2778
Hawthorne 10:37:51 -27.8 Dark Up 26.5 76.0 Low 10:22:51 - 10:52:51 2722
Lee Vining 10:37:49 -28.5 Dark Up 26.0 75.4 Low 10:22:49 - 10:52:49 2699
Tonopah 10:37:50 -27.3 Dark Up 27.5 76.5 Low 10:22:50 - 10:52:50 2629
Bishop 10:37:47 -28.5 Dark Up 26.4 75.5 Low 10:22:47 - 10:52:47 2623
CPSLO 10:37:37 -31.2 Dark Up 24.0 73.5 Low 10:22:37 - 10:52:37 2556
Beatty 10:37:47 -27.8 Dark Up 27.5 76.1 Low 10:22:47 - 10:52:47 2520
Indian Springs 10:37:46 -27.4 Dark Up 28.3 76.5 Low 10:22:46 - 10:52:46 2450
Henderson 10:37:45 -27.3 Dark Up 28.7 76.6 Low 10:22:45 - 10:52:45 2378
Wildwood 10:37:34 -30.9 Dark Up 25.3 73.9 Low 10:22:34 - 10:52:34 2373
Searchlight/Boulder City 10:37:42 -27.7 Dark Up 28.6 76.3 Low 10:22:42 - 10:52:42 2329
Niwot 10:38:15 -18.6 Dark Up 37.1 84.5 Up 10:23:15 - 10:53:15 2316
SwRI 10:38:15 -18.8 Dark Up 37.0 84.3 Up 10:23:15 - 10:53:15 2311
Laughlin/Bullhead City 10:37:42 -27.6 Dark Up 28.8 76.3 Low 10:22:42 - 10:52:42 2290
Patrick 10:37:44 -27.0 Dark Up 29.4 76.7 Low 10:22:44 - 10:52:44 2281
Kingman/Dolan Springs 10:37:43 -27.3 Dark Up 29.2 76.5 Low 10:22:43 - 10:52:43 2270
Mohave Valley 10:37:41 -27.8 Dark Up 28.8 76.1 Low 10:22:41 - 10:52:41 2267
Idyllwild 10:37:34 -29.9 Dark Up 26.7 74.6 Low 10:22:34 - 10:52:34 2264
DCO 10:37:44 -26.8 Dark Up 29.9 76.9 Low 10:22:44 - 10:52:44 2226
Lake Havasu City 10:37:40 -27.9 Dark Up 28.8 76.0 Low 10:22:40 - 10:52:40 2224
Parker 10:37:39 -28.1 Dark Up 28.8 75.9 Low 10:22:39 - 10:52:39 2194
Blythe 10:37:37 -28.6 Dark Up 28.4 75.4 Low 10:22:37 - 10:52:37 2163
Calipatria 10:37:34 -29.6 Dark Up 27.5 74.8 Low 10:22:34 - 10:52:34 2162
Yuma 10:37:33 -29.3 Dark Up 28.1 74.9 Low 10:22:33 - 10:52:33 2088
George/Scottsdale 10:37:41 -26.8 Dark Up 30.7 76.7 Up 10:22:41 - 10:52:41 2055

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 12UD178, (2027/08/24 10:42UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 19.19  41
Alnath         05:26:17.5 +28:36:23  1.6  7.29  30
139 Tau        05:57:59.6 +25:57:14  4.7  0.63  37
PPM 095183     05:58:52.8 +25:46:37  7.7  0.84  37
PPM 095137     05:57:19.2 +26:51:12  9.0  0.30  36
PPM 095168     05:58:28.9 +26:48:36 10.7  0.26  37
12UD178        05:57:55.2 +26:35:07 15.9        37
Positions are for J2000

Event circumstances last updated at 2020/08/15 22:15:08 UT

Marc W. Buie, Southwest Research Institute

RECON