RECON: TNO occultation with 12UL177

Event between 12UL177 and star GA1200:00462550 with event index number of 2306922

Geocentric closest approach at 2022/12/20 10:07:00 UTC

J2000 position of star is 02:48:42.4 +30:21:27
Equinox of date position of star is 02:50:01.0 +30:26:50
Stellar brightness G=15.1, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 167 degrees from the moon. Moon is 12% illuminated.
TNO apparent brightness V=23.0

[RECON map]
TNO is 36.0 AU from the Sun and 35.3 AU from the Earth.
The TNO is moving 19.1 km/sec on the sky relative to the star, or, 2.7 arcsec/hr.
The 1-sigma error in the time of the event is 146 seconds.
The 1-sigma cross-track error in the shadow position is 1973 km.
The sky-plane scale is 25571.5 km/arcsec.

The TNO has an absolute magnitude Hv=7.4
Diameter=193.2 km assuming a 5% albedo -- 10.4 sec chord
Diameter=78.9 km assuming a 30% albedo -- 4.3 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 12UL177, (2022/12/20 10:07UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:14.5 +16:33:13  0.8 28.11 157
Algol          03:09:40.3 +41:02:33  2.1 11.31 156
39 Ari         02:49:17.0 +29:20:28  5.6  1.12 168
PPM 067804     02:51:23.3 +30:37:12  7.2  0.33 167
PPM 067767     02:49:41.6 +30:26:15  9.3  0.09 167
12UL177        02:50:05.1 +30:27:07 15.1       167
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 28.1 km RECON observability=1.0 and success probability=16.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Clarence Fulton 10:02:17 -53.5 Dark Down 30.2 282.4 Up 09:49:37 - 10:14:57 -1706
Kelowna 10:02:17 -53.8 Dark Down 30.2 282.5 Up 09:49:37 - 10:14:57 -1750
Peachland 10:02:17 -54.0 Dark Down 30.4 282.4 Up 09:49:37 - 10:14:57 -1768
Summerland 10:02:17 -54.1 Dark Down 30.3 282.5 Up 09:49:37 - 10:14:57 -1782
Penticton 10:02:16 -54.0 Dark Down 30.2 282.7 Up 09:49:36 - 10:14:56 -1787
Oliver 10:02:16 -54.2 Dark Down 30.1 282.9 Up 09:49:36 - 10:14:56 -1824
Anarchist Mountain Observatory 10:02:15 -54.2 Dark Down 29.9 283.1 Low 09:49:35 - 10:14:55 -1838
Tonasket 10:02:15 -54.5 Dark Down 29.9 283.2 Low 09:49:35 - 10:14:55 -1872
Okanogan 10:02:15 -54.7 Dark Down 29.9 283.3 Low 09:49:35 - 10:14:55 -1911
Brewster 10:02:15 -55.0 Dark Down 30.0 283.3 Up 09:49:35 - 10:14:55 -1944
Victoria 10:02:22 -56.7 Dark Down 32.4 280.7 Up 09:49:42 - 10:15:02 -1967
Manson/Chelan 10:02:15 -55.3 Dark Down 30.2 283.2 Up 09:49:35 - 10:14:55 -1974
Wenatchee 10:02:15 -55.7 Dark Down 30.2 283.3 Up 09:49:35 - 10:14:55 -2028
Ellensburg 10:02:15 -56.0 Dark Down 30.3 283.4 Up 09:49:35 - 10:14:55 -2077
Yakima 10:02:15 -56.2 Dark Down 30.2 283.7 Up 09:49:35 - 10:14:55 -2121
Pasco 10:02:11 -55.6 Dark Down 29.1 284.7 Low 09:49:31 - 10:14:51 -2126
Toppenish/White Swan 10:02:14 -56.3 Dark Down 30.0 283.9 Up 09:49:34 - 10:14:54 -2140
PNWRO 10:02:11 -55.6 Dark Down 28.9 285.0 Low 09:49:31 - 10:14:51 -2148
Goldendale 10:02:14 -56.8 Dark Down 30.2 283.9 Up 09:49:34 - 10:14:54 -2208
The Dalles 10:02:15 -57.1 Dark Down 30.4 283.8 Up 09:49:35 - 10:14:55 -2240
Maupin 10:02:14 -57.3 Dark Down 30.2 284.1 Up 09:49:34 - 10:14:54 -2283
Dunrhomin 10:01:45 -48.1 Dark Down 17.6 295.2 Really Low 09:49:05 - 10:14:25 -2340
Redmond 10:02:13 -57.8 Dark Down 30.0 284.6 Up 09:49:33 - 10:14:53 -2381
Sisters 10:02:14 -58.1 Dark Down 30.3 284.3 Up 09:49:34 - 10:14:54 -2387
Bend 10:02:14 -58.0 Dark Down 30.1 284.6 Up 09:49:34 - 10:14:54 -2407
Oregon Observatory 10:02:14 -58.2 Dark Down 30.1 284.6 Up 09:49:34 - 10:14:54 -2429
La Pine/Gilchrist 10:02:14 -58.3 Dark Down 30.1 284.7 Up 09:49:34 - 10:14:54 -2452
North Lake 10:02:12 -58.2 Dark Down 29.6 285.3 Low 09:49:32 - 10:14:52 -2486
Paisley 10:02:11 -58.2 Dark Down 29.2 285.8 Low 09:49:31 - 10:14:51 -2537
Chiloquin 10:02:14 -59.1 Dark Down 30.1 285.1 Up 09:49:34 - 10:14:54 -2579
Lakeview 10:02:11 -58.3 Dark Down 28.9 286.2 Low 09:49:31 - 10:14:51 -2587
Klamath Falls 10:02:13 -59.2 Dark Down 29.9 285.4 Low 09:49:33 - 10:14:53 -2614
Cedarville 10:02:09 -58.5 Dark Down 28.6 286.6 Low 09:49:29 - 10:14:49 -2654
Fall River/Burney 10:02:12 -59.5 Dark Down 29.3 286.2 Low 09:49:32 - 10:14:52 -2733
Susanville 10:02:10 -59.3 Dark Down 28.6 287.0 Low 09:49:30 - 10:14:50 -2784
Gimple 10:02:10 -59.5 Dark Down 28.7 287.0 Low 09:49:30 - 10:14:50 -2818
Greenville 10:02:10 -59.6 Dark Down 28.8 286.9 Low 09:49:30 - 10:14:50 -2820
Quincy 10:02:10 -59.7 Dark Down 28.7 287.0 Low 09:49:30 - 10:14:50 -2841
Portola 10:02:09 -59.4 Dark Down 28.3 287.4 Low 09:49:29 - 10:14:49 -2844
Reno 10:02:08 -59.0 Dark Down 27.8 287.8 Low 09:49:28 - 10:14:48 -2857
Carson City 10:02:07 -59.1 Dark Down 27.6 288.0 Low 09:49:27 - 10:14:47 -2895
Yerington 10:02:07 -58.8 Dark Down 27.1 288.4 Low 09:49:27 - 10:14:47 -2900
Gardnerville 10:02:08 -59.2 Dark Down 27.5 288.2 Low 09:49:28 - 10:14:48 -2920
Hawthorne 10:02:05 -58.5 Dark Down 26.6 288.9 Low 09:49:25 - 10:14:45 -2937
Tonopah 10:02:02 -57.6 Dark Down 25.4 289.8 Low 09:49:22 - 10:14:42 -2950
Lee Vining 10:02:06 -59.1 Dark Down 26.7 288.9 Low 09:49:26 - 10:14:46 -3009
Bishop 10:02:04 -58.7 Dark Down 26.0 289.6 Low 09:49:24 - 10:14:44 -3054
Beatty 10:02:00 -57.6 Dark Down 24.6 290.5 Low 09:49:20 - 10:14:40 -3059
Indian Springs 10:01:58 -56.8 Dark Down 23.7 291.2 Low 09:49:18 - 10:14:38 -3063
Henderson 10:01:57 -56.4 Dark Down 23.0 291.7 Low 09:49:17 - 10:14:37 -3098
Patrick 10:01:55 -55.7 Dark Down 21.9 292.5 Low 09:49:15 - 10:14:35 -3130
Kingman/Dolan Springs 10:01:55 -55.9 Dark Down 22.0 292.5 Low 09:49:15 - 10:14:35 -3159
Laughlin/Bullhead City 10:01:56 -56.3 Dark Down 22.4 292.2 Low 09:49:16 - 10:14:36 -3177
Mohave Valley 10:01:56 -56.3 Dark Down 22.3 292.4 Low 09:49:16 - 10:14:36 -3205
Lake Havasu City 10:01:56 -56.2 Dark Down 21.9 292.6 Low 09:49:16 - 10:14:36 -3239
George/Scottsdale 10:01:51 -54.3 Dark Down 19.8 294.0 Really Low 09:49:11 - 10:14:31 -3240
Parker 10:01:56 -56.2 Dark Down 21.8 292.8 Low 09:49:16 - 10:14:36 -3275
CPSLO 10:02:09 -61.0 Dark Down 27.0 289.5 Low 09:49:29 - 10:14:49 -3328
Blythe 10:01:56 -56.5 Dark Down 21.8 292.8 Low 09:49:16 - 10:14:36 -3338
Idyllwild 10:02:00 -58.2 Dark Down 23.5 291.9 Low 09:49:20 - 10:14:40 -3389
Wildwood 10:02:04 -59.7 Dark Down 25.0 290.9 Low 09:49:24 - 10:14:44 -3404
Calipatria 10:01:58 -57.4 Dark Down 22.3 292.6 Low 09:49:18 - 10:14:38 -3418
Yuma 10:01:56 -56.7 Dark Down 21.5 293.1 Low 09:49:16 - 10:14:36 -3435

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 12UL177, (2022/12/20 10:07UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 28.11 157
Algol          03:08:10.1 +40:57:20  2.1 11.31 156
39 Ari         02:47:54.8 +29:14:46  5.6  1.12 168
PPM 067804     02:50:00.4 +30:31:33  7.2  0.33 167
PPM 067767     02:48:18.9 +30:20:34  9.3  0.09 167
12UL177        02:48:42.4 +30:21:27 15.1       167
Positions are for J2000

Event circumstances last updated at 2021/10/27 00:00:28 UT

Marc W. Buie, Southwest Research Institute

RECON