RECON: TNO occultation with 12XW159

Event between 12XW159 and star GA0980:02596309 with event index number of 2036418

Geocentric closest approach at 2027/12/16 10:42:07 UTC

J2000 position of star is 07:02:37.7 +08:00:02
Equinox of date position of star is 07:03:50.6 +07:58:00
Stellar brightness G=15.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 21 degrees from the moon. Moon is 90% illuminated.
TNO apparent brightness V=22.6

[RECON map]
TNO is 32.8 AU from the Sun and 31.9 AU from the Earth.
The TNO is moving 22.7 km/sec on the sky relative to the star, or, 3.5 arcsec/hr.
The 1-sigma error in the time of the event is 502 seconds.
The 1-sigma cross-track error in the shadow position is 2317 km.
The sky-plane scale is 23117.7 km/arcsec.

The TNO has an absolute magnitude Hv=7.4
Diameter=200.5 km assuming a 5% albedo -- 8.8 sec chord
Diameter=81.8 km assuming a 30% albedo -- 3.6 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 12XW159, (2027/12/16 10:42UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:41.2 +07:24:36  0.4 16.72  36
Alhena         06:39:19.6 +16:22:23  1.9 10.37  24
PPM 151655     07:00:09.6 +07:34:55  6.2  1.06  22
PPM 151792     07:03:56.0 +08:05:16  8.1  0.14  21
12XW159        07:04:08.7 +07:57:29 15.9        21
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 1.8 sigma about the mid-time.
The median site spacing is 26.3 km RECON observability=1.0 and success probability=10.7%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 10:40:44 -39.2 Dark Up 38.1 224.0 Up 10:25:44 - 10:55:44 4810
Kamloops 10:41:21 -48.1 Dark Up 44.5 207.1 Up 10:26:21 - 10:56:21 4591
Kelowna 10:41:17 -47.9 Dark Up 44.9 208.6 Up 10:26:17 - 10:56:17 4532
Peachland 10:41:18 -48.2 Dark Up 45.1 208.3 Up 10:26:18 - 10:56:18 4521
Summerland 10:41:17 -48.2 Dark Up 45.2 208.5 Up 10:26:17 - 10:56:17 4510
Penticton 10:41:17 -48.1 Dark Up 45.2 208.7 Up 10:26:17 - 10:56:17 4505
Oliver 10:41:16 -48.3 Dark Up 45.5 208.8 Up 10:26:16 - 10:56:16 4477
Anarchist Mountain Observatory 10:41:15 -48.2 Dark Up 45.6 209.2 Up 10:26:15 - 10:56:15 4464
Tonasket 10:41:15 -48.4 Dark Up 45.9 209.2 Up 10:26:15 - 10:56:15 4438
Okanogan 10:41:15 -48.6 Dark Up 46.3 209.2 Up 10:26:15 - 10:56:15 4410
Victoria 10:41:27 -50.8 Dark Up 47.3 203.9 Up 10:26:27 - 10:56:27 4396
Brewster 10:41:15 -48.8 Dark Up 46.6 209.1 Up 10:26:15 - 10:56:15 4386
Manson/Chelan 10:41:16 -49.1 Dark Up 46.9 208.7 Up 10:26:16 - 10:56:16 4366
Wenatchee 10:41:16 -49.4 Dark Up 47.3 208.7 Up 10:26:16 - 10:56:16 4325
Ellensburg 10:41:16 -49.7 Dark Up 47.8 208.6 Up 10:26:16 - 10:56:16 4289
Yakima 10:41:16 -49.9 Dark Up 48.1 208.8 Up 10:26:16 - 10:56:16 4254
Toppenish/White Swan 10:41:15 -49.8 Dark Up 48.3 209.2 Up 10:26:15 - 10:56:15 4237
PNWRO 10:41:09 -49.0 Dark Up 48.1 211.4 Up 10:26:09 - 10:56:09 4217
Goldendale 10:41:16 -50.3 Dark Up 48.9 208.9 Up 10:26:16 - 10:56:16 4187
The Dalles 10:41:17 -50.6 Dark Up 49.2 208.5 Up 10:26:17 - 10:56:17 4165
Maupin 10:41:16 -50.7 Dark Up 49.6 208.8 Up 10:26:16 - 10:56:16 4129
Sisters 10:41:16 -51.3 Dark Up 50.5 208.6 Up 10:26:16 - 10:56:16 4049
Bend 10:41:15 -51.2 Dark Up 50.6 209.2 Up 10:26:15 - 10:56:15 4030
Oregon Observatory 10:41:15 -51.4 Dark Up 50.8 209.1 Up 10:26:15 - 10:56:15 4014
North Lake 10:41:13 -51.2 Dark Up 51.2 210.2 Up 10:26:13 - 10:56:13 3962
Chiloquin 10:41:15 -52.1 Dark Up 52.1 209.3 Up 10:26:15 - 10:56:15 3894
Lakeview 10:41:10 -51.1 Dark Up 51.9 211.7 Up 10:26:10 - 10:56:10 3872
Klamath Falls 10:41:14 -52.1 Dark Up 52.4 209.6 Up 10:26:14 - 10:56:14 3864
Dunrhomin 10:40:17 -40.3 Dark Up 45.7 232.7 Up 10:25:17 - 10:55:17 3838
CU-SBO 10:40:17 -40.4 Dark Up 45.9 232.7 Up 10:25:17 - 10:55:17 3814
Cedarville 10:41:08 -51.2 Dark Up 52.4 212.4 Up 10:26:08 - 10:56:08 3814
Fall River/Burney 10:41:11 -52.2 Dark Up 53.3 210.9 Up 10:26:11 - 10:56:11 3760
Susanville 10:41:08 -51.8 Dark Up 53.5 212.5 Up 10:26:08 - 10:56:08 3708
Gimple 10:41:09 -52.0 Dark Up 53.8 212.4 Up 10:26:09 - 10:56:09 3681
Greenville 10:41:09 -52.1 Dark Up 53.9 212.2 Up 10:26:09 - 10:56:09 3681
Quincy 10:41:08 -52.2 Dark Up 54.0 212.4 Up 10:26:08 - 10:56:08 3662
Portola 10:41:07 -51.8 Dark Up 53.9 213.2 Up 10:26:07 - 10:56:07 3654
Reno 10:41:04 -51.4 Dark Up 53.9 214.4 Up 10:26:04 - 10:56:04 3635
Carson City 10:41:04 -51.5 Dark Up 54.2 214.7 Up 10:26:04 - 10:56:04 3602
Yerington 10:41:01 -51.0 Dark Up 54.0 215.8 Up 10:26:01 - 10:56:01 3589
Gardnerville 10:41:03 -51.5 Dark Up 54.3 215.0 Up 10:26:03 - 10:56:03 3580
Hawthorne 10:40:59 -50.7 Dark Up 54.2 216.9 Up 10:25:59 - 10:55:59 3550
Tonopah 10:40:53 -49.7 Dark Up 53.9 219.4 Up 10:25:53 - 10:55:53 3519
Lee Vining 10:40:59 -51.2 Dark Up 54.9 216.7 Up 10:25:59 - 10:55:59 3493
Bishop 10:40:56 -50.7 Dark Up 55.0 218.3 Up 10:25:56 - 10:55:56 3443
Beatty 10:40:50 -49.5 Dark Up 54.5 221.1 Up 10:25:50 - 10:55:50 3414
Indian Springs 10:40:46 -48.7 Dark Up 54.2 222.9 Up 10:25:46 - 10:55:46 3393
Henderson 10:40:43 -48.2 Dark Up 54.2 224.4 Up 10:25:43 - 10:55:43 3348
Patrick 10:40:38 -47.4 Dark Up 54.0 226.5 Up 10:25:38 - 10:55:38 3299
Kingman/Dolan Springs 10:40:38 -47.5 Dark Up 54.3 226.5 Up 10:25:38 - 10:55:38 3276
Laughlin/Bullhead City 10:40:40 -47.9 Dark Up 54.6 225.8 Up 10:25:40 - 10:55:40 3268
Mohave Valley 10:40:39 -48.0 Dark Up 54.8 226.1 Up 10:25:39 - 10:55:39 3242
Lake Havasu City 10:40:38 -47.8 Dark Up 54.9 226.8 Up 10:25:38 - 10:55:38 3205
Parker 10:40:37 -47.8 Dark Up 55.1 227.2 Up 10:25:37 - 10:55:37 3172
George/Scottsdale 10:40:28 -45.8 Dark Up 53.9 230.8 Up 10:25:28 - 10:55:28 3155
Wildwood 10:40:53 -51.3 Dark Up 57.6 221.1 Up 10:25:53 - 10:55:53 3126
Idyllwild 10:40:46 -49.8 Dark Up 56.8 224.3 Up 10:25:46 - 10:55:46 3109
Calipatria 10:40:40 -48.8 Dark Up 56.6 226.6 Up 10:25:40 - 10:55:40 3060
Yuma 10:40:37 -48.1 Dark Up 56.3 228.3 Up 10:25:37 - 10:55:37 3026

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 12XW159, (2027/12/16 10:42UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 16.72  36
Alhena         06:37:42.8 +16:23:57  1.9 10.37  24
PPM 151655     06:58:38.9 +07:37:19  6.2  1.06  22
PPM 151792     07:02:24.9 +08:07:49  8.1  0.14  21
12XW159        07:02:37.7 +08:00:02 15.9        21
Positions are for J2000

Event circumstances last updated at 2022/05/19 23:02:12 UT

Marc W. Buie, Southwest Research Institute

RECON