RECON: TNO occultation with 181855

Event between (181855) 98WT31 and star GA1360:03585552 with event index number of 2664197

Geocentric closest approach at 2029/01/09 04:20:57 UTC

J2000 position of star is 06:03:15.9 +46:35:14
Equinox of date position of star is 06:04:56.5 +46:35:06
Stellar brightness G=14.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 128 degrees from the moon. Moon is 32% illuminated.
TNO apparent brightness V=23.5

[RECON map]
TNO is 37.7 AU from the Sun and 36.9 AU from the Earth.
The TNO is moving 23.9 km/sec on the sky relative to the star, or, 3.2 arcsec/hr.
The 1-sigma error in the time of the event is 675 seconds.
The 1-sigma cross-track error in the shadow position is 5626 km.
The sky-plane scale is 26729.1 km/arcsec.

The TNO has an absolute magnitude Hv=7.7
Diameter=173.8 km assuming a 5% albedo -- 7.3 sec chord
Diameter=70.9 km assuming a 30% albedo -- 3.0 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 181855, (2029/01/09 04:21UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:47:05.6 +27:57:13  1.1 27.27 108
34Bet Aur      06:01:39.6 +44:56:49  1.9  1.76 129
35Pi Aur       06:02:05.4 +45:56:09  5.9  0.87 129
PPM 048675     06:04:39.2 +46:38:31  8.2  0.15 128
PPM 048691     06:05:22.6 +46:37:53  9.1  0.05 128
181855         06:05:26.1 +46:35:03 14.5       128
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 1.3 sigma about the mid-time.
The median site spacing is 27.2 km RECON observability=1.0 and success probability=9.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kamloops 04:22:34 -37.9 Dark Down 65.8 85.4 Up 04:07:34 - 04:37:34 -2446
Victoria 04:22:47 -36.4 Dark Down 63.5 79.1 Up 04:07:47 - 04:37:47 -2536
Kelowna 04:22:34 -38.7 Dark Down 66.3 84.1 Up 04:07:34 - 04:37:34 -2554
Peachland 04:22:35 -38.5 Dark Down 66.1 83.7 Up 04:07:35 - 04:37:35 -2554
Summerland 04:22:35 -38.6 Dark Down 66.1 83.4 Up 04:07:35 - 04:37:35 -2572
Penticton 04:22:35 -38.7 Dark Down 66.2 83.3 Up 04:07:35 - 04:37:35 -2582
Oliver 04:22:36 -38.7 Dark Down 66.1 82.5 Up 04:07:36 - 04:37:36 -2616
Anarchist Mountain Observatory 04:22:36 -38.9 Dark Down 66.2 82.3 Up 04:07:36 - 04:37:36 -2639
Tonasket 04:22:37 -38.9 Dark Down 66.1 81.5 Up 04:07:37 - 04:37:37 -2666
Okanogan 04:22:38 -38.9 Dark Down 66.0 80.7 Up 04:07:38 - 04:37:38 -2693
Brewster 04:22:39 -38.8 Dark Down 65.8 80.0 Up 04:07:39 - 04:37:39 -2712
Manson/Chelan 04:22:41 -38.6 Dark Down 65.5 79.4 Up 04:07:41 - 04:37:41 -2718
Sleaford 04:21:57 -45.9 Dark Down 74.6 102.0 Up 04:06:57 - 04:36:57 -2730
Wenatchee 04:22:42 -38.6 Dark Down 65.3 78.3 Up 04:07:42 - 04:37:42 -2757
Ellensburg 04:22:43 -38.5 Dark Down 65.1 77.3 Up 04:07:43 - 04:37:43 -2789
Yakima 04:22:45 -38.5 Dark Down 65.0 76.5 Up 04:07:45 - 04:37:45 -2827
Toppenish/White Swan 04:22:45 -38.7 Dark Down 65.1 76.1 Up 04:07:45 - 04:37:45 -2854
Goldendale 04:22:47 -38.5 Dark Down 64.7 74.8 Up 04:07:47 - 04:37:47 -2891
The Dalles 04:22:48 -38.2 Dark Down 64.4 74.2 Up 04:07:48 - 04:37:48 -2898
Maupin 04:22:49 -38.4 Dark Down 64.3 73.4 Up 04:07:49 - 04:37:49 -2942
PNWRO 04:22:42 -39.8 Dark Down 66.0 75.8 Up 04:07:42 - 04:37:42 -2946
Sisters 04:22:52 -38.1 Dark Down 63.7 71.6 Up 04:07:52 - 04:37:52 -3007
Bend 04:22:52 -38.3 Dark Down 63.8 71.2 Up 04:07:52 - 04:37:52 -3040
Oregon Observatory 04:22:53 -38.3 Dark Down 63.7 70.8 Up 04:07:53 - 04:37:53 -3051
North Lake 04:22:52 -38.7 Dark Down 63.8 69.7 Up 04:07:52 - 04:37:52 -3134
Chiloquin 04:22:57 -38.1 Dark Down 62.9 68.3 Up 04:07:57 - 04:37:57 -3160
Klamath Falls 04:22:57 -38.2 Dark Down 62.9 67.7 Up 04:07:57 - 04:37:57 -3196
Lakeview 04:22:54 -39.2 Dark Down 63.8 67.8 Up 04:07:54 - 04:37:54 -3259
Fall River/Burney 04:22:59 -38.5 Dark Down 62.7 65.6 Up 04:07:59 - 04:37:59 -3325
Cedarville 04:22:55 -39.4 Dark Down 63.7 66.5 Up 04:07:55 - 04:37:55 -3330
Susanville 04:22:58 -39.1 Dark Down 62.9 64.5 Up 04:07:58 - 04:37:58 -3417
Greenville 04:23:00 -38.9 Dark Down 62.6 64.0 Up 04:08:00 - 04:38:00 -3431
Gimple 04:22:59 -39.0 Dark Down 62.6 64.0 Up 04:07:59 - 04:37:59 -3435
Quincy 04:23:00 -38.9 Dark Down 62.5 63.7 Up 04:08:00 - 04:38:00 -3451
Portola 04:22:59 -39.3 Dark Down 62.8 63.4 Up 04:07:59 - 04:37:59 -3483
Reno 04:22:58 -39.8 Dark Down 63.1 63.0 Up 04:07:58 - 04:37:58 -3537
Carson City 04:22:58 -39.9 Dark Down 63.0 62.3 Up 04:07:58 - 04:37:58 -3572
Gardnerville 04:22:59 -39.9 Dark Down 62.9 61.9 Up 04:07:59 - 04:37:59 -3598
Yerington 04:22:57 -40.3 Dark Down 63.3 61.9 Up 04:07:57 - 04:37:57 -3618
Hawthorne 04:22:56 -40.8 Dark Down 63.4 61.1 Up 04:07:56 - 04:37:56 -3685
Lee Vining 04:22:59 -40.4 Dark Down 62.8 60.2 Up 04:07:59 - 04:37:59 -3720
Tonopah 04:22:53 -41.9 Dark Down 64.2 60.0 Up 04:07:53 - 04:37:53 -3789
Bishop 04:22:58 -41.0 Dark Down 63.0 59.0 Up 04:07:58 - 04:37:58 -3809
Beatty 04:22:54 -42.3 Dark Down 63.9 57.9 Up 04:07:54 - 04:37:54 -3921
Dunrhomin 04:22:06 -50.6 Dark Down 73.2 60.7 Up 04:07:06 - 04:37:06 -3986
Indian Springs 04:22:51 -43.2 Dark Down 64.4 57.0 Up 04:07:51 - 04:37:51 -3997
CU-SBO 04:22:06 -50.6 Dark Down 73.1 60.0 Up 04:07:06 - 04:37:06 -4010
Henderson 04:22:50 -43.8 Dark Down 64.6 55.8 Up 04:07:50 - 04:37:50 -4078
Wildwood 04:23:05 -40.9 Dark Down 61.1 53.9 Up 04:08:05 - 04:38:05 -4119
Laughlin/Bullhead City 04:22:50 -44.2 Dark Down 64.4 54.1 Up 04:07:50 - 04:37:50 -4181
Patrick 04:22:48 -44.7 Dark Down 65.0 54.3 Up 04:07:48 - 04:37:48 -4184
Kingman/Dolan Springs 04:22:49 -44.6 Dark Down 64.7 54.0 Up 04:07:49 - 04:37:49 -4199
Mohave Valley 04:22:51 -44.2 Dark Down 64.2 53.7 Up 04:07:51 - 04:37:51 -4208
Idyllwild 04:22:59 -42.5 Dark Down 62.1 52.7 Up 04:07:59 - 04:37:59 -4235
Lake Havasu City 04:22:51 -44.4 Dark Down 64.1 52.9 Up 04:07:51 - 04:37:51 -4258
Parker 04:22:51 -44.4 Dark Down 63.9 52.3 Up 04:07:51 - 04:37:51 -4294
Calipatria 04:22:57 -43.5 Dark Down 62.5 51.3 Up 04:07:57 - 04:37:57 -4345
Yuma 04:22:55 -44.2 Dark Down 62.8 50.2 Up 04:07:55 - 04:37:55 -4424
George/Scottsdale 04:22:44 -46.5 Dark Down 65.2 50.3 Up 04:07:44 - 04:37:44 -4431

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 181855, (2029/01/09 04:21UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1 27.27 108
34Bet Aur      05:59:31.6 +44:56:51  1.9  1.76 129
35Pi Aur       05:59:56.1 +45:56:12  5.9  0.87 129
PPM 048675     06:02:28.9 +46:38:40  8.2  0.15 128
PPM 048691     06:03:12.3 +46:38:03  9.1  0.05 128
181855         06:03:15.9 +46:35:14 14.5       128
Positions are for J2000

Event circumstances last updated at 2022/06/03 23:01:38 UT

Marc W. Buie, Southwest Research Institute

RECON