RECON: TNO occultation with 12UN177

Event between 12UN177 and star GA1260:00603827 with event index number of 1118017

Geocentric closest approach at 2021/09/26 04:58:29 UTC

J2000 position of star is 02:47:51.6 +36:11:47
Equinox of date position of star is 02:49:07.0 +36:16:47
Stellar brightness G=11.4, use SENSEUP=8
Star is 22 degrees from the moon. Moon is 76% illuminated.
TNO apparent brightness V=25.7

[RECON map]
TNO is 36.3 AU from the Sun and 35.7 AU from the Earth.
The TNO is moving 17.0 km/sec on the sky relative to the star, or, 2.4 arcsec/hr.
The 1-sigma error in the time of the event is 466 seconds.
The 1-sigma cross-track error in the shadow position is 3986 km.
The sky-plane scale is 25882.7 km/arcsec.

The TNO has an absolute magnitude Hv=10.0
Diameter=186.2 km assuming a 5% albedo -- 3.6 sec chord
Diameter=76.0 km assuming a 30% albedo -- 1.4 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 12UN177, (2021/09/26 04:58UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:10.2 +16:33:05  0.8 31.01   9
Algol          03:09:35.5 +41:02:16  2.1  6.19  23
17 Per         02:52:51.6 +35:08:53  5.8  1.36  21
PPM 067734     02:48:19.3 +36:04:25  7.2  0.28  22
PPM 067771     02:49:59.8 +36:17:58  9.0  0.16  22
12UN177        02:49:12.7 +36:17:10 11.4        22
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 23.2 km RECON observability=1.0 and success probability=7.6%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Victoria 05:03:12 -28.8 Dark Up 29.7 67.6 Low 04:48:12 - 05:18:12 6599
Clarence Fulton 05:03:00 -29.8 Dark Up 32.8 71.1 Up 04:48:00 - 05:18:00 6567
Peachland 05:03:02 -29.9 Dark Up 32.3 70.5 Up 04:48:02 - 05:18:02 6546
Kelowna 05:03:02 -30.0 Dark Up 32.5 70.7 Up 04:48:02 - 05:18:02 6543
Summerland 05:03:03 -30.1 Dark Up 32.3 70.4 Up 04:48:03 - 05:18:03 6530
Penticton 05:03:03 -30.2 Dark Up 32.4 70.5 Up 04:48:03 - 05:18:03 6520
Oliver 05:03:05 -30.4 Dark Up 32.3 70.3 Up 04:48:05 - 05:18:05 6493
Anarchist Mountain Observatory 05:03:05 -30.6 Dark Up 32.3 70.3 Up 04:48:05 - 05:18:05 6471
Tonasket 05:03:07 -30.8 Dark Up 32.2 70.1 Up 04:48:07 - 05:18:07 6450
Okanogan 05:03:09 -30.9 Dark Up 32.0 69.8 Up 04:48:09 - 05:18:09 6429
Brewster 05:03:10 -31.0 Dark Up 31.8 69.5 Up 04:48:10 - 05:18:10 6415
Manson/Chelan 05:03:11 -30.9 Dark Up 31.5 69.2 Up 04:48:11 - 05:18:11 6414
Entiat 05:03:13 -31.0 Dark Up 31.3 69.0 Up 04:48:13 - 05:18:13 6399
Wenatchee 05:03:13 -31.1 Dark Up 31.2 68.8 Up 04:48:13 - 05:18:13 6383
Ellensburg 05:03:15 -31.3 Dark Up 30.9 68.4 Up 04:48:15 - 05:18:15 6359
Yakima 05:03:17 -31.5 Dark Up 30.7 68.2 Up 04:48:17 - 05:18:17 6327
Toppenish/White Swan 05:03:18 -31.7 Dark Up 30.8 68.2 Up 04:48:18 - 05:18:18 6302
Goldendale 05:03:20 -31.8 Dark Up 30.3 67.7 Up 04:48:20 - 05:18:20 6276
The Dalles 05:03:20 -31.8 Dark Up 30.0 67.3 Low 04:48:20 - 05:18:20 6274
Pasco 05:03:16 -32.5 Dark Up 31.5 68.8 Up 04:48:16 - 05:18:16 6238
Maupin 05:03:24 -32.1 Dark Up 29.9 67.2 Low 04:48:24 - 05:18:24 6235
PNWRO 05:03:17 -32.8 Dark Up 31.6 68.8 Up 04:48:17 - 05:18:17 6209
Sisters 05:03:27 -32.3 Dark Up 29.2 66.5 Low 04:48:27 - 05:18:27 6185
Redmond 05:03:26 -32.6 Dark Up 29.5 66.7 Low 04:48:26 - 05:18:26 6165
Bend 05:03:27 -32.6 Dark Up 29.3 66.5 Low 04:48:27 - 05:18:27 6154
Oregon Observatory 05:03:27 -32.6 Dark Up 29.2 66.3 Low 04:48:27 - 05:18:27 6146
La Pine/Gilchrist 05:03:30 -32.7 Dark Up 29.0 66.2 Low 04:48:30 - 05:18:30 6132
North Lake 05:03:30 -33.3 Dark Up 29.3 66.3 Low 04:48:30 - 05:18:30 6069
Klamath Falls 05:03:35 -33.4 Dark Up 28.3 65.3 Low 04:48:35 - 05:18:35 6024
Paisley 05:03:31 -33.9 Dark Up 29.3 66.2 Low 04:48:31 - 05:18:31 6007
Lakeview 05:03:34 -34.3 Dark Up 29.2 66.0 Low 04:48:34 - 05:18:34 5955
Fall River/Burney 05:03:39 -34.3 Dark Up 28.0 65.0 Low 04:48:39 - 05:18:39 5908
Cedarville 05:03:36 -34.8 Dark Up 29.1 65.8 Low 04:48:36 - 05:18:36 5892
Susanville 05:03:40 -35.1 Dark Up 28.3 65.0 Low 04:48:40 - 05:18:40 5820
Greenville 05:03:41 -35.1 Dark Up 28.0 64.7 Low 04:48:41 - 05:18:41 5810
Gimple 05:03:41 -35.2 Dark Up 28.0 64.8 Low 04:48:41 - 05:18:41 5806
Quincy 05:03:42 -35.2 Dark Up 27.9 64.6 Low 04:48:42 - 05:18:42 5793
Portola 05:03:42 -35.6 Dark Up 28.2 64.8 Low 04:48:42 - 05:18:42 5759
Reno 05:03:42 -36.2 Dark Up 28.5 65.0 Low 04:48:42 - 05:18:42 5706
Carson City 05:03:43 -36.4 Dark Up 28.4 64.8 Low 04:48:43 - 05:18:43 5674
Gardnerville 05:03:44 -36.6 Dark Up 28.3 64.7 Low 04:48:44 - 05:18:44 5650
Yerington 05:03:43 -36.9 Dark Up 28.7 65.0 Low 04:48:43 - 05:18:43 5627
Hawthorne 05:03:44 -37.5 Dark Up 28.9 65.0 Low 04:48:44 - 05:18:44 5561
Lee Vining 05:03:46 -37.5 Dark Up 28.3 64.5 Low 04:48:46 - 05:18:46 5535
Tonopah 05:03:43 -38.7 Dark Up 29.7 65.4 Low 04:48:43 - 05:18:43 5453
Bishop 05:03:47 -38.3 Dark Up 28.6 64.5 Low 04:48:47 - 05:18:47 5448
CPSLO 05:03:56 -37.9 Dark Up 26.1 62.7 Low 04:48:56 - 05:18:56 5378
Beatty 05:03:46 -39.7 Dark Up 29.6 65.0 Low 04:48:46 - 05:18:46 5328
Indian Springs 05:03:45 -40.6 Dark Up 30.2 65.2 Up 04:48:45 - 05:18:45 5247
Wildwood 05:03:57 -40.0 Dark Up 27.0 62.9 Low 04:48:57 - 05:18:57 5166
Henderson 05:03:46 -41.3 Dark Up 30.5 65.2 Up 04:48:46 - 05:18:46 5165
Niwot 05:03:13 -44.0 Dark Up 39.1 71.9 Up 04:48:13 - 05:18:13 5114
Searchlight/Boulder City 05:03:48 -41.7 Dark Up 30.3 65.0 Up 04:48:48 - 05:18:48 5110
SwRI 05:03:13 -44.1 Dark Up 39.0 71.8 Up 04:48:13 - 05:18:13 5108
Laughlin/Bullhead City 05:03:47 -42.1 Dark Up 30.5 64.9 Up 04:48:47 - 05:18:47 5066
Patrick 05:03:45 -42.4 Dark Up 31.1 65.3 Up 04:48:45 - 05:18:45 5055
Kingman/Dolan Springs 05:03:46 -42.4 Dark Up 30.8 65.1 Up 04:48:46 - 05:18:46 5044
Mohave Valley 05:03:48 -42.3 Dark Up 30.3 64.8 Up 04:48:48 - 05:18:48 5041
Idyllwild 05:03:55 -41.5 Dark Up 28.3 63.4 Low 04:48:55 - 05:18:55 5040
DCO 05:03:44 -43.1 Dark Up 31.5 65.4 Up 04:48:44 - 05:18:44 4993
Lake Havasu City 05:03:48 -42.7 Dark Up 30.4 64.7 Up 04:48:48 - 05:18:48 4992
Parker 05:03:49 -42.9 Dark Up 30.2 64.5 Up 04:48:49 - 05:18:49 4958
Calipatria 05:03:54 -42.7 Dark Up 28.9 63.6 Low 04:48:54 - 05:18:54 4925
Blythe 05:03:51 -43.0 Dark Up 29.8 64.1 Low 04:48:51 - 05:18:51 4925
Yuma 05:03:55 -43.6 Dark Up 29.4 63.6 Low 04:48:55 - 05:18:55 4841
George/Scottsdale 05:03:46 -44.8 Dark Up 31.9 65.1 Up 04:48:46 - 05:18:46 4802

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 12UN177, (2021/09/26 04:58UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 31.01   9
Algol          03:08:10.1 +40:57:20  2.1  6.19  23
17 Per         02:51:30.9 +35:03:34  5.8  1.36  21
PPM 067734     02:46:58.4 +35:59:01  7.2  0.28  22
PPM 067771     02:48:38.6 +36:12:36  9.0  0.16  22
12UN177        02:47:51.6 +36:11:47 11.4        22
Positions are for J2000

Event circumstances last updated at 2020/03/11 23:41:32 UT

Marc W. Buie, Southwest Research Institute

RECON