RECON: TNO occultation with 181855

Event between (181855) 98WT31 and star GA1320:02823453 with event index number of 1300454

Geocentric closest approach at 2024/01/22 07:38:19 UTC

J2000 position of star is 05:16:29.4 +43:16:10
Equinox of date position of star is 05:17:53.1 +43:17:22
Stellar brightness G=14.0, use SENSEUP=64
Star is 16 degrees from the moon. Moon is 89% illuminated.
TNO apparent brightness V=23.1

[RECON map]
TNO is 37.6 AU from the Sun and 36.9 AU from the Earth.
The TNO is moving 19.0 km/sec on the sky relative to the star, or, 2.6 arcsec/hr.
The 1-sigma error in the time of the event is 516 seconds.
The 1-sigma cross-track error in the shadow position is 5321 km.
The sky-plane scale is 26755.5 km/arcsec.

The TNO has an absolute magnitude Hv=7.3
Diameter=208.9 km assuming a 5% albedo -- 11.0 sec chord
Diameter=85.3 km assuming a 30% albedo -- 4.5 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 181855, (2024/01/22 07:38UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:18.2 +16:33:21  0.8 28.12  16
34Bet Aur      06:01:17.7 +44:56:50  1.9  7.90  19
20Rho Aur      05:23:30.7 +41:49:33  4.9  1.76  14
PPM 047916     05:17:55.8 +42:46:52  8.0  0.52  15
PPM 047931     05:18:50.6 +43:27:07  9.8  0.19  16
PPM 047907     05:17:22.8 +43:12:07 11.5  0.18  16
181855         05:18:13.1 +43:17:39 14.0        16
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 1.7 sigma about the mid-time.
The median site spacing is 25.1 km RECON observability=1.0 and success probability=6.6%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 07:35:56 -59.2 Dark Up 64.2 269.3 Up 07:20:56 - 07:50:56 -5647
Summerland 07:35:58 -59.4 Dark Up 64.4 269.7 Up 07:20:58 - 07:50:58 -5682
Penticton 07:35:58 -59.5 Dark Up 64.4 269.9 Up 07:20:58 - 07:50:58 -5689
Okanagan Falls 07:35:58 -59.7 Dark Up 64.4 270.3 Up 07:20:58 - 07:50:58 -5710
Oliver 07:35:57 -59.8 Dark Up 64.4 270.7 Up 07:20:57 - 07:50:57 -5728
Anarchist Mountain Observatory 07:35:56 -60.0 Dark Up 64.2 271.2 Up 07:20:56 - 07:50:56 -5745
Oroville 07:35:56 -60.1 Dark Up 64.3 271.2 Up 07:20:56 - 07:50:56 -5754
Tonasket 07:35:56 -60.3 Dark Up 64.3 271.7 Up 07:20:56 - 07:50:56 -5779
Okanogan 07:35:58 -60.6 Dark Up 64.3 272.3 Up 07:20:58 - 07:50:58 -5818
Brewster 07:35:57 -60.8 Dark Up 64.5 272.8 Up 07:20:57 - 07:50:57 -5850
Manson/Chelan 07:35:58 -61.0 Dark Up 64.7 273.0 Up 07:20:58 - 07:50:58 -5876
Entiat 07:35:58 -61.1 Dark Up 64.7 273.4 Up 07:20:58 - 07:50:58 -5901
Wenatchee 07:35:58 -61.4 Dark Up 64.8 273.8 Up 07:20:58 - 07:50:58 -5930
Ellensburg 07:35:59 -61.7 Dark Up 64.9 274.6 Up 07:20:59 - 07:50:59 -5977
Yakima 07:35:59 -62.1 Dark Up 64.9 275.4 Up 07:20:59 - 07:50:59 -6022
Toppenish/White Swan 07:35:58 -62.3 Dark Up 64.7 276.0 Up 07:20:58 - 07:50:58 -6045
Pasco 07:35:54 -62.7 Dark Up 63.9 277.0 Up 07:20:54 - 07:50:54 -6047
PNWRO 07:35:53 -63.0 Dark Up 63.7 277.6 Up 07:20:53 - 07:50:53 -6072
George/Umatilla 07:35:55 -63.0 Dark Up 64.0 277.5 Up 07:20:55 - 07:50:55 -6086
Goldendale 07:36:01 -62.8 Dark Up 65.0 276.9 Up 07:21:01 - 07:51:01 -6109
The Dalles 07:36:01 -62.9 Dark Up 65.2 277.2 Up 07:21:01 - 07:51:01 -6137
Maupin 07:36:00 -63.3 Dark Up 65.1 278.2 Up 07:21:00 - 07:51:00 -6183
Madras/Culver 07:36:00 -63.8 Dark Up 65.0 279.3 Up 07:21:00 - 07:51:00 -6243
Redmond 07:36:00 -64.1 Dark Up 65.0 280.0 Up 07:21:00 - 07:51:00 -6283
Sisters 07:36:02 -64.0 Dark Up 65.3 279.8 Up 07:21:02 - 07:51:02 -6284
Bend 07:36:01 -64.3 Dark Up 65.1 280.4 Up 07:21:01 - 07:51:01 -6308
Oregon Observatory 07:36:02 -64.4 Dark Up 65.1 280.8 Up 07:21:02 - 07:51:02 -6328
La Pine/Gilchrist 07:36:02 -64.6 Dark Up 65.1 281.2 Up 07:21:02 - 07:51:02 -6352
North Lake 07:35:58 -65.1 Dark Up 64.6 282.3 Up 07:20:58 - 07:50:58 -6395
Paisley 07:35:57 -65.7 Dark Up 64.2 283.5 Up 07:20:57 - 07:50:57 -6452
Niwot 07:35:00 -69.1 Dark Up 52.6 291.9 Up 07:20:00 - 07:50:00 -6475
Chiloquin 07:36:02 -65.5 Dark Up 65.1 283.4 Up 07:21:02 - 07:51:02 -6477
SwRI 07:35:00 -69.2 Dark Up 52.7 292.0 Up 07:20:00 - 07:50:00 -6488
Lakeview 07:35:57 -66.3 Dark Up 64.0 284.6 Up 07:20:57 - 07:50:57 -6506
Klamath Falls 07:36:01 -65.8 Dark Up 65.0 284.1 Up 07:21:01 - 07:51:01 -6514
Tulelake 07:36:00 -66.2 Dark Up 64.7 284.8 Up 07:21:00 - 07:51:00 -6542
Cedarville 07:35:55 -66.9 Dark Up 63.7 285.9 Up 07:20:55 - 07:50:55 -6577
Fall River/Burney 07:36:00 -67.0 Dark Up 64.4 286.6 Up 07:21:00 - 07:51:00 -6641
Susanville 07:35:56 -67.8 Dark Up 63.7 288.0 Up 07:20:56 - 07:50:56 -6704
Gimple 07:35:58 -68.0 Dark Up 63.8 288.5 Up 07:20:58 - 07:50:58 -6736
Greenville 07:35:58 -68.0 Dark Up 63.8 288.5 Up 07:20:58 - 07:50:58 -6737
Quincy 07:35:58 -68.1 Dark Up 63.7 288.9 Up 07:20:58 - 07:50:58 -6759
Portola 07:35:55 -68.4 Dark Up 63.4 289.2 Up 07:20:55 - 07:50:55 -6769
Reno 07:35:54 -68.9 Dark Up 62.8 289.8 Up 07:20:54 - 07:50:54 -6792
Carson City 07:35:53 -69.2 Dark Up 62.7 290.4 Up 07:20:53 - 07:50:53 -6831
Yerington 07:35:52 -69.6 Dark Up 62.2 290.8 Up 07:20:52 - 07:50:52 -6845
Gardnerville 07:35:52 -69.4 Dark Up 62.6 290.9 Up 07:20:52 - 07:50:52 -6857
Hawthorne 07:35:48 -70.1 Dark Up 61.6 291.7 Up 07:20:48 - 07:50:48 -6890
Tonopah 07:35:43 -71.0 Dark Up 60.4 292.6 Up 07:20:43 - 07:50:43 -6924
Lee Vining 07:35:50 -70.5 Dark Up 61.7 292.6 Up 07:20:50 - 07:50:50 -6957
Bishop 07:35:46 -71.3 Dark Up 61.0 293.7 Up 07:20:46 - 07:50:46 -7014
Beatty 07:35:40 -72.2 Dark Up 59.6 294.5 Up 07:20:40 - 07:50:40 -7043
Indian Springs 07:35:36 -72.7 Dark Up 58.7 295.0 Up 07:20:36 - 07:50:36 -7063
Lone Pine 07:35:45 -72.1 Dark Up 60.4 294.9 Up 07:20:45 - 07:50:45 -7093
Henderson 07:35:33 -73.4 Dark Up 58.0 295.8 Up 07:20:33 - 07:50:33 -7110
Patrick 07:35:28 -74.2 Dark Up 56.9 296.7 Up 07:20:28 - 07:50:28 -7159
Searchlight/Boulder City 07:35:33 -73.9 Dark Up 57.7 296.6 Up 07:20:33 - 07:50:33 -7171
DCO 07:35:25 -74.5 Dark Up 56.3 297.1 Up 07:20:25 - 07:50:25 -7180
Kingman/Dolan Springs 07:35:29 -74.3 Dark Up 57.0 297.0 Up 07:20:29 - 07:50:29 -7186
Laughlin/Bullhead City 07:35:31 -74.3 Dark Up 57.3 297.0 Up 07:20:31 - 07:50:31 -7197
Mohave Valley 07:35:30 -74.6 Dark Up 57.2 297.4 Up 07:20:30 - 07:50:30 -7227
CPSLO 07:35:56 -72.3 Dark Up 61.7 297.2 Up 07:20:56 - 07:50:56 -7262
Lake Havasu City 07:35:29 -75.0 Dark Up 56.8 298.0 Up 07:20:29 - 07:50:29 -7265
Parker 07:35:30 -75.3 Dark Up 56.6 298.4 Up 07:20:30 - 07:50:30 -7302
Blythe 07:35:31 -75.8 Dark Up 56.6 299.1 Up 07:20:31 - 07:50:31 -7364
Wildwood 07:35:47 -74.2 Dark Up 59.7 298.8 Up 07:20:47 - 07:50:47 -7370
Idyllwild 07:35:39 -75.2 Dark Up 58.2 299.1 Up 07:20:39 - 07:50:39 -7384
Calipatria 07:35:34 -76.1 Dark Up 57.0 299.9 Up 07:20:34 - 07:50:34 -7431
Yuma 07:35:31 -76.7 Dark Up 56.2 300.4 Up 07:20:31 - 07:50:31 -7463

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, (2024/01/22 07:38UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 28.12  16
34Bet Aur      05:59:31.6 +44:56:51  1.9  7.90  19
20Rho Aur      05:21:48.4 +41:48:15  4.9  1.76  14
PPM 047916     05:16:12.6 +42:45:22  8.0  0.52  15
PPM 047931     05:17:06.6 +43:25:39  9.8  0.19  16
PPM 047907     05:15:39.2 +43:10:36 11.5  0.18  16
181855         05:16:29.4 +43:16:10 14.0        16
Positions are for J2000

Event circumstances last updated at 2019/06/08 06:26:44 UT

Marc W. Buie, Southwest Research Institute

RECON