RECON: TNO occultation with 181855

Event between (181855) 98WT31 and star GA1320:02848007 with event index number of 1300448

Geocentric closest approach at 2024/01/09 05:55:30 UTC

J2000 position of star is 05:17:47.2 +43:19:55
Equinox of date position of star is 05:19:11.0 +43:21:05
Stellar brightness G=15.1, use SENSEUP=128
Star is 164 degrees from the moon. Moon is 7% illuminated.
TNO apparent brightness V=23.1

[RECON map]
TNO is 37.6 AU from the Sun and 36.8 AU from the Earth.
The TNO is moving 22.4 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 452 seconds.
The 1-sigma cross-track error in the shadow position is 5304 km.
The sky-plane scale is 26671.2 km/arcsec.

The TNO has an absolute magnitude Hv=7.3
Diameter=208.9 km assuming a 5% albedo -- 9.3 sec chord
Diameter=85.3 km assuming a 30% albedo -- 3.8 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 181855, (2024/01/09 05:55UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:18.1 +16:33:21  0.8 28.26 167
34Bet Aur      06:01:17.5 +44:56:50  1.9  7.66 159
20Rho Aur      05:23:30.6 +41:49:33  4.9  1.70 165
PPM 047955     05:19:58.9 +42:48:55  7.0  0.55 164
PPM 047931     05:18:50.4 +43:27:07  9.8  0.16 164
181855         05:19:30.8 +43:21:21 15.1       164
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 2.0 sigma about the mid-time.
The median site spacing is 25.3 km RECON observability=1.0 and success probability=8.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 05:55:29 -52.5 Dark Down 83.3 169.4 Up 05:40:29 - 06:10:29 -3817
Summerland 05:55:30 -52.5 Dark Down 83.6 167.1 Up 05:40:30 - 06:10:30 -3845
Penticton 05:55:30 -52.6 Dark Down 83.7 167.7 Up 05:40:30 - 06:10:30 -3854
Okanagan Falls 05:55:30 -52.7 Dark Down 83.9 167.2 Up 05:40:30 - 06:10:30 -3874
Oliver 05:55:31 -52.8 Dark Down 84.0 167.0 Up 05:40:31 - 06:10:31 -3892
Anarchist Mountain Observatory 05:55:31 -53.0 Dark Down 84.2 168.0 Up 05:40:31 - 06:10:31 -3913
Oroville 05:55:30 -53.0 Dark Down 84.3 167.3 Up 05:40:30 - 06:10:30 -3920
Tonasket 05:55:31 -53.2 Dark Down 84.5 166.8 Up 05:40:31 - 06:10:31 -3945
Okanogan 05:55:31 -53.3 Dark Down 84.8 164.8 Up 05:40:31 - 06:10:31 -3979
Brewster 05:55:32 -53.3 Dark Down 85.0 162.4 Up 05:40:32 - 06:10:32 -4005
Manson/Chelan 05:55:34 -53.2 Dark Down 85.1 158.6 Up 05:40:34 - 06:10:34 -4022
Entiat 05:55:34 -53.3 Dark Down 85.3 157.1 Up 05:40:34 - 06:10:34 -4044
Wenatchee 05:55:35 -53.4 Dark Down 85.5 155.0 Up 05:40:35 - 06:10:35 -4070
Ellensburg 05:55:36 -53.5 Dark Down 85.8 150.6 Up 05:40:36 - 06:10:36 -4111
Yakima 05:55:37 -53.7 Dark Down 86.2 147.4 Up 05:40:37 - 06:10:37 -4155
Toppenish/White Swan 05:55:36 -53.9 Dark Down 86.4 147.3 Up 05:40:36 - 06:10:36 -4181
Pasco 05:55:32 -54.7 Dark Down 86.9 160.7 Up 05:40:32 - 06:10:32 -4216
Goldendale 05:55:39 -53.9 Dark Down 86.7 137.5 Up 05:40:39 - 06:10:39 -4233
PNWRO 05:55:31 -55.0 Dark Down 87.2 162.2 Up 05:40:31 - 06:10:31 -4246
George/Umatilla 05:55:34 -54.7 Dark Down 87.2 155.4 Up 05:40:34 - 06:10:34 -4248
The Dalles 05:55:40 -53.8 Dark Down 86.7 131.5 Up 05:40:40 - 06:10:40 -4251
Maupin 05:55:40 -54.1 Dark Down 87.0 126.5 Up 05:40:40 - 06:10:40 -4298
Madras/Culver 05:55:40 -54.3 Dark Down 87.2 117.0 Up 05:40:40 - 06:10:40 -4356
Sisters 05:55:42 -54.2 Dark Down 87.1 108.0 Up 05:40:42 - 06:10:42 -4384
Redmond 05:55:41 -54.4 Dark Down 87.4 109.7 Up 05:40:41 - 06:10:41 -4394
Bend 05:55:42 -54.4 Dark Down 87.3 104.5 Up 05:40:42 - 06:10:42 -4414
Oregon Observatory 05:55:43 -54.4 Dark Down 87.3 100.4 Up 05:40:43 - 06:10:43 -4431
La Pine/Gilchrist 05:55:43 -54.5 Dark Down 87.3 96.0 Up 05:40:43 - 06:10:43 -4452
North Lake 05:55:42 -55.1 Dark Down 87.7 86.7 Up 05:40:42 - 06:10:42 -4510
Chiloquin 05:55:46 -54.7 Dark Down 86.9 74.3 Up 05:40:46 - 06:10:46 -4565
Paisley 05:55:40 -55.6 Dark Down 87.9 71.7 Up 05:40:40 - 06:10:40 -4576
Klamath Falls 05:55:46 -54.9 Dark Down 86.9 68.0 Up 05:40:46 - 06:10:46 -4603
Lakeview 05:55:41 -55.9 Dark Down 87.8 58.1 Up 05:40:41 - 06:10:41 -4635
Tulelake 05:55:45 -55.2 Dark Down 86.9 62.0 Up 05:40:45 - 06:10:45 -4638
Cedarville 05:55:41 -56.3 Dark Down 87.5 43.9 Up 05:40:41 - 06:10:41 -4709
Fall River/Burney 05:55:46 -55.7 Dark Down 86.5 48.4 Up 05:40:46 - 06:10:46 -4738
Susanville 05:55:44 -56.4 Dark Down 86.4 35.5 Up 05:40:44 - 06:10:44 -4821
Greenville 05:55:45 -56.3 Dark Down 86.0 35.6 Up 05:40:45 - 06:10:45 -4844
Gimple 05:55:44 -56.4 Dark Down 86.1 34.9 Up 05:40:44 - 06:10:44 -4846
Quincy 05:55:45 -56.4 Dark Down 85.9 33.9 Up 05:40:45 - 06:10:45 -4866
Portola 05:55:44 -56.8 Dark Down 85.9 29.0 Up 05:40:44 - 06:10:44 -4889
Reno 05:55:42 -57.3 Dark Down 85.9 21.5 Up 05:40:42 - 06:10:42 -4931
Carson City 05:55:42 -57.5 Dark Down 85.6 19.6 Up 05:40:42 - 06:10:42 -4970
Gardnerville 05:55:42 -57.6 Dark Down 85.4 18.2 Up 05:40:42 - 06:10:42 -4997
Yerington 05:55:40 -58.0 Dark Down 85.5 13.3 Up 05:40:40 - 06:10:40 -5003
Niwot 05:54:47 -66.4 Dark Down 80.2 293.3 Up 05:39:47 - 06:09:47 -5038
SwRI 05:54:48 -66.4 Dark Down 80.3 294.0 Up 05:39:48 - 06:09:48 -5049
Hawthorne 05:55:38 -58.6 Dark Down 85.1 7.6 Up 05:40:38 - 06:10:38 -5063
Lee Vining 05:55:40 -58.4 Dark Down 84.5 10.5 Up 05:40:40 - 06:10:40 -5115
Tonopah 05:55:33 -59.8 Dark Down 84.7 356.0 Up 05:40:33 - 06:10:33 -5138
Bishop 05:55:38 -59.2 Dark Down 84.0 4.5 Up 05:40:38 - 06:10:38 -5193
Beatty 05:55:33 -60.5 Dark Down 83.5 353.8 Up 05:40:33 - 06:10:33 -5271
Lone Pine 05:55:38 -59.7 Dark Down 83.3 2.0 Up 05:40:38 - 06:10:38 -5281
Indian Springs 05:55:28 -61.5 Dark Down 83.1 347.7 Up 05:40:28 - 06:10:28 -5323
CPSLO 05:55:49 -58.1 Dark Down 81.7 14.6 Up 05:40:49 - 06:10:49 -5370
Henderson 05:55:26 -62.2 Dark Down 82.4 344.9 Up 05:40:26 - 06:10:26 -5392
Searchlight/Boulder City 05:55:27 -62.4 Dark Down 81.8 345.6 Up 05:40:27 - 06:10:27 -5455
Patrick 05:55:22 -63.2 Dark Down 81.6 340.8 Up 05:40:22 - 06:10:22 -5476
Laughlin/Bullhead City 05:55:26 -62.8 Dark Down 81.5 344.5 Up 05:40:26 - 06:10:26 -5492
Kingman/Dolan Springs 05:55:24 -63.2 Dark Down 81.4 342.1 Up 05:40:24 - 06:10:24 -5497
DCO 05:55:20 -63.9 Dark Down 81.1 338.4 Up 05:40:20 - 06:10:20 -5519
Mohave Valley 05:55:26 -62.9 Dark Down 81.2 344.9 Up 05:40:26 - 06:10:26 -5522
Wildwood 05:55:42 -60.0 Dark Down 80.7 3.8 Up 05:40:42 - 06:10:42 -5541
Lake Havasu City 05:55:25 -63.2 Dark Down 80.8 344.5 Up 05:40:25 - 06:10:25 -5569
Parker 05:55:25 -63.4 Dark Down 80.4 344.9 Up 05:40:25 - 06:10:25 -5607
Idyllwild 05:55:36 -61.6 Dark Down 80.4 355.6 Up 05:40:36 - 06:10:36 -5614
Blythe 05:55:27 -63.3 Dark Down 80.0 346.9 Up 05:40:27 - 06:10:27 -5660
Calipatria 05:55:30 -62.7 Dark Down 79.7 351.1 Up 05:40:30 - 06:10:30 -5698
Yuma 05:55:28 -63.6 Dark Down 79.1 348.1 Up 05:40:28 - 06:10:28 -5759

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, (2024/01/09 05:55UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 28.26 167
34Bet Aur      05:59:31.6 +44:56:51  1.9  7.66 159
20Rho Aur      05:21:48.4 +41:48:15  4.9  1.70 165
PPM 047955     05:18:15.7 +42:47:30  7.0  0.55 164
PPM 047931     05:17:06.6 +43:25:39  9.8  0.16 164
181855         05:17:47.2 +43:19:55 15.1       164
Positions are for J2000

Event circumstances last updated at 2019/06/08 06:23:08 UT

Marc W. Buie, Southwest Research Institute

RECON