RECON: TNO occultation with 12LB27

Event between 12LB27 and star GA0980:17110484 with event index number of 1793884

Geocentric closest approach at 2021/08/10 09:44:56 UTC

J2000 position of star is 20:21:16.1 +08:18:26
Equinox of date position of star is 20:22:18.2 +08:22:33
Stellar brightness G=14.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 136 degrees from the moon. Moon is 4% illuminated.
TNO apparent brightness V=21.7

[RECON map]
TNO is 15.7 AU from the Sun and 14.8 AU from the Earth.
The TNO is moving 20.9 km/sec on the sky relative to the star, or, 7.0 arcsec/hr.
The 1-sigma error in the time of the event is 81 seconds.
The 1-sigma cross-track error in the shadow position is 839 km.
The sky-plane scale is 10713.0 km/arcsec.

The TNO has an absolute magnitude Hv=9.7
Diameter=70.5 km assuming a 5% albedo -- 3.4 sec chord
Diameter=28.8 km assuming a 30% albedo -- 1.4 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 12LB27, (2021/08/10 09:45UT)
Object            RA         Dec     mag  sep  mel
Vega           18:37:40.2 +38:48:17  0.0 38.44 101
Tarazed        19:47:17.2 +10:40:02  2.7  8.93 128
PPM 170088     20:29:10.6 +08:30:37  6.3  1.70 138
PPM 169817     20:21:28.9 +07:41:03  8.2  0.72 137
PPM 169864     20:22:37.7 +08:31:47 10.0  0.17 136
12LB27         20:22:19.1 +08:22:37 14.6       137
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 26.1 km RECON observability=1.0 and success probability=53.4%
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 09:41:42 -20.8 Dark Down 36.6 232.3 Up 09:34:26 - 09:48:59 1388
Kelowna 09:41:42 -21.2 Dark Down 36.9 232.3 Up 09:34:26 - 09:48:59 1353
Peachland 09:41:42 -21.4 Dark Down 37.2 232.1 Up 09:34:26 - 09:48:59 1347
Summerland 09:41:42 -21.5 Dark Down 37.2 232.3 Up 09:34:26 - 09:48:59 1331
Penticton 09:41:41 -21.5 Dark Down 37.2 232.4 Up 09:34:25 - 09:48:58 1323
Oliver 09:41:41 -21.8 Dark Down 37.4 232.6 Up 09:34:25 - 09:48:58 1290
Victoria 09:41:51 -23.4 Dark Down 39.8 228.9 Up 09:34:35 - 09:49:08 1288
Anarchist Mountain Observatory 09:41:41 -21.9 Dark Down 37.4 232.9 Up 09:34:24 - 09:48:57 1271
Tonasket 09:41:41 -22.2 Dark Down 37.6 233.0 Up 09:34:24 - 09:48:57 1242
Okanogan 09:41:40 -22.6 Dark Down 37.9 233.1 Up 09:34:24 - 09:48:57 1212
Brewster 09:41:41 -22.9 Dark Down 38.2 233.1 Up 09:34:24 - 09:48:57 1189
Manson/Chelan 09:41:42 -23.2 Dark Down 38.5 232.8 Up 09:34:25 - 09:48:58 1174
Wenatchee 09:41:42 -23.6 Dark Down 38.9 232.9 Up 09:34:25 - 09:48:58 1131
Ellensburg 09:41:42 -24.1 Dark Down 39.2 233.0 Up 09:34:26 - 09:48:59 1095
Yakima 09:41:42 -24.5 Dark Down 39.5 233.2 Up 09:34:25 - 09:48:58 1055
Toppenish/White Swan 09:41:42 -24.6 Dark Down 39.5 233.5 Up 09:34:25 - 09:48:58 1031
Pasco 09:41:38 -24.3 Dark Down 38.9 234.9 Up 09:34:21 - 09:48:54 999
Goldendale 09:41:42 -25.2 Dark Down 40.1 233.4 Up 09:34:26 - 09:48:59 984
PNWRO 09:41:37 -24.5 Dark Down 38.9 235.3 Up 09:34:21 - 09:48:54 971
The Dalles 09:41:43 -25.5 Dark Down 40.4 233.2 Up 09:34:26 - 09:48:59 968
Maupin 09:41:43 -25.9 Dark Down 40.6 233.6 Up 09:34:26 - 09:48:59 925
Sisters 09:41:43 -26.8 Dark Down 41.4 233.7 Up 09:34:27 - 09:49:00 847
Redmond 09:41:42 -26.7 Dark Down 41.2 234.1 Up 09:34:26 - 09:48:59 838
Bend 09:41:43 -27.0 Dark Down 41.4 234.1 Up 09:34:26 - 09:48:59 819
Oregon Observatory 09:41:43 -27.2 Dark Down 41.6 234.1 Up 09:34:26 - 09:48:59 804
La Pine/Gilchrist 09:41:43 -27.4 Dark Down 41.8 234.2 Up 09:34:26 - 09:48:59 785
North Lake 09:41:41 -27.6 Dark Down 41.7 235.2 Up 09:34:24 - 09:48:57 731
Chiloquin 09:41:43 -28.5 Dark Down 42.6 234.7 Up 09:34:27 - 09:49:00 680
Paisley 09:41:40 -28.0 Dark Down 41.8 235.9 Up 09:34:23 - 09:48:56 670
Klamath Falls 09:41:43 -28.8 Dark Down 42.8 235.0 Up 09:34:27 - 09:49:00 644
Lakeview 09:41:39 -28.4 Dark Down 41.9 236.5 Up 09:34:22 - 09:48:55 615
Cedarville 09:41:38 -28.9 Dark Down 42.2 237.2 Up 09:34:21 - 09:48:54 546
Fall River/Burney 09:41:42 -29.7 Dark Down 43.2 236.3 Up 09:34:25 - 09:48:58 518
Susanville 09:41:39 -30.1 Dark Down 43.1 237.6 Up 09:34:23 - 09:48:56 441
Greenville 09:41:40 -30.4 Dark Down 43.4 237.5 Up 09:34:23 - 09:48:56 418
Gimple 09:41:39 -30.4 Dark Down 43.4 237.6 Up 09:34:23 - 09:48:56 417
Quincy 09:41:40 -30.6 Dark Down 43.5 237.6 Up 09:34:23 - 09:48:56 398
Portola 09:41:38 -30.5 Dark Down 43.3 238.2 Up 09:34:22 - 09:48:55 376
Reno 09:41:36 -30.5 Dark Down 43.0 239.1 Up 09:34:20 - 09:48:53 337
Carson City 09:41:36 -30.9 Dark Down 43.2 239.4 Up 09:34:20 - 09:48:53 300
Gardnerville 09:41:36 -31.1 Dark Down 43.3 239.6 Up 09:34:19 - 09:48:52 274
Yerington 09:41:34 -30.8 Dark Down 42.8 240.2 Up 09:34:18 - 09:48:51 269
Hawthorne 09:41:32 -31.0 Dark Down 42.7 241.1 Up 09:34:16 - 09:48:49 211
Dunrhomin 09:40:57 -23.7 Dark Down 32.6 251.5 Up 09:33:40 - 09:48:13 208
Lee Vining 09:41:34 -31.7 Dark Down 43.3 241.1 Up 09:34:17 - 09:48:50 162
Tonopah 09:41:28 -30.9 Dark Down 42.0 242.8 Up 09:34:11 - 09:48:44 139
Bishop 09:41:31 -31.9 Dark Down 43.1 242.2 Up 09:34:15 - 09:48:48 86
Beatty 09:41:26 -31.7 Dark Down 42.2 244.1 Up 09:34:10 - 09:48:43 10
Indian Springs 09:41:23 -31.5 Dark Down 41.5 245.4 Up 09:34:06 - 09:48:39 -42
CPSLO 09:41:38 -34.6 Dark Down 45.7 241.9 Up 09:34:22 - 09:48:55 -87
Henderson 09:41:21 -31.7 Dark Down 41.2 246.4 Up 09:34:04 - 09:48:37 -110
Patrick 09:41:17 -31.7 Dark Down 40.7 247.8 Up 09:34:00 - 09:48:33 -194
Laughlin/Bullhead City 09:41:19 -32.2 Dark Down 41.3 247.5 Up 09:34:03 - 09:48:36 -209
Kingman/Dolan Springs 09:41:18 -32.0 Dark Down 40.9 247.9 Up 09:34:01 - 09:48:34 -215
Mohave Valley 09:41:19 -32.4 Dark Down 41.4 247.7 Up 09:34:03 - 09:48:36 -238
Wildwood 09:41:32 -34.9 Dark Down 44.7 244.9 Up 09:34:15 - 09:48:48 -254
Lake Havasu City 09:41:18 -32.6 Dark Down 41.3 248.2 Up 09:34:02 - 09:48:35 -284
Parker 09:41:18 -32.9 Dark Down 41.5 248.5 Up 09:34:01 - 09:48:34 -322
Idyllwild 09:41:25 -34.4 Dark Down 43.4 246.8 Up 09:34:09 - 09:48:42 -325
Blythe 09:41:19 -33.5 Dark Down 41.9 248.7 Up 09:34:02 - 09:48:35 -374
George/Scottsdale 09:41:11 -32.1 Dark Down 39.7 250.8 Up 09:33:54 - 09:48:27 -405
Calipatria 09:41:22 -34.3 Dark Down 42.8 248.4 Up 09:34:05 - 09:48:38 -411
Yuma 09:41:19 -34.3 Dark Down 42.2 249.5 Up 09:34:03 - 09:48:36 -472

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 12LB27, (2021/08/10 09:45UT)
Object            RA         Dec     mag  sep  mel
Vega           18:36:56.7 +38:47:07  0.0 38.44 101
Tarazed        19:46:15.6 +10:36:48  2.7  8.93 128
PPM 170088     20:28:07.6 +08:26:15  6.3  1.70 138
PPM 169817     20:20:25.6 +07:36:53  8.2  0.72 137
PPM 169864     20:21:34.8 +08:27:35 10.0  0.17 136
12LB27         20:21:16.1 +08:18:26 14.6       136
Positions are for J2000

Event circumstances last updated at 2021/04/21 22:33:21 UT

Marc W. Buie, Southwest Research Institute

RECON