RECON: TNO occultation with 181855

Event between (181855) 98WT31 and star GA1320:02649907 with event index number of 1211430

Geocentric closest approach at 2023/04/01 04:29:29 UTC

J2000 position of star is 05:07:35.0 +42:02:43
Equinox of date position of star is 05:08:57.6 +42:04:10
Stellar brightness G=15.6, use SENSEUP=128
Star is 55 degrees from the moon. Moon is 78% illuminated.
TNO apparent brightness V=23.2

[RECON map]
TNO is 37.6 AU from the Sun and 37.9 AU from the Earth.
The TNO is moving 16.8 km/sec on the sky relative to the star, or, 2.2 arcsec/hr.
The 1-sigma error in the time of the event is 479 seconds.
The 1-sigma cross-track error in the shadow position is 4650 km.
The sky-plane scale is 27506.8 km/arcsec.

The TNO has an absolute magnitude Hv=7.3
Diameter=208.9 km assuming a 5% albedo -- 12.4 sec chord
Diameter=85.3 km assuming a 30% albedo -- 5.1 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 181855, (2023/04/01 04:29UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:15.4 +16:33:16  0.8 26.42  66
3Iot Aur       04:58:30.7 +33:12:03  2.7  9.12  58
10Eta Aur      05:08:08.9 +41:15:49  3.2  0.84  56
PPM 047736     05:08:57.2 +42:07:28  8.0  0.07  55
PPM 047743     05:09:28.6 +42:02:23  9.3  0.06  55
181855         05:09:13.8 +42:04:27 15.6        55
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 1.9 sigma about the mid-time.
The median site spacing is 8.8 km RECON observability=1.0 and success probability=6.8%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Niwot 04:33:10 -33.5 Dark Up 35.0 298.6 Up 04:18:10 - 04:48:10 -2201
SwRI 04:33:11 -33.5 Dark Up 35.0 298.7 Up 04:18:11 - 04:48:11 -2211
Kelowna 04:32:05 -19.5 Dark Up 48.1 283.5 Up 04:17:05 - 04:47:05 -2532
Penticton 04:32:07 -19.6 Dark Up 48.1 283.8 Up 04:17:07 - 04:47:07 -2559
Summerland 04:32:06 -19.5 Dark Up 48.2 283.7 Up 04:17:06 - 04:47:06 -2562
Okanagan Falls 04:32:08 -19.7 Dark Up 48.1 284.0 Up 04:17:08 - 04:47:08 -2570
Anarchist Mountain Observatory 04:32:10 -20.0 Dark Up 47.8 284.5 Up 04:17:10 - 04:47:10 -2576
Oliver 04:32:09 -19.8 Dark Up 48.0 284.2 Up 04:17:09 - 04:47:09 -2577
Oroville 04:32:11 -20.0 Dark Up 47.9 284.5 Up 04:17:11 - 04:47:11 -2583
Tonasket 04:32:12 -20.1 Dark Up 47.8 284.8 Up 04:17:12 - 04:47:12 -2595
Okanogan 04:32:14 -20.2 Dark Up 47.8 285.1 Up 04:17:14 - 04:47:14 -2620
Brewster 04:32:16 -20.2 Dark Up 47.8 285.3 Up 04:17:16 - 04:47:16 -2645
Manson/Chelan 04:32:17 -20.1 Dark Up 48.0 285.3 Up 04:17:17 - 04:47:17 -2676
Entiat 04:32:17 -20.2 Dark Up 48.0 285.5 Up 04:17:17 - 04:47:17 -2691
Pasco 04:32:27 -21.6 Dark Up 46.9 287.5 Up 04:17:27 - 04:47:27 -2705
PNWRO 04:32:28 -21.9 Dark Up 46.6 287.9 Up 04:17:28 - 04:47:28 -2706
Wenatchee 04:32:19 -20.3 Dark Up 48.0 285.7 Up 04:17:19 - 04:47:19 -2710
George/Umatilla 04:32:29 -21.7 Dark Up 46.9 287.8 Up 04:17:29 - 04:47:29 -2736
Ellensburg 04:32:21 -20.4 Dark Up 48.0 286.0 Up 04:17:21 - 04:47:21 -2744
Yakima 04:32:23 -20.6 Dark Up 47.9 286.5 Up 04:17:23 - 04:47:23 -2767
Toppenish/White Swan 04:32:25 -20.8 Dark Up 47.7 286.8 Up 04:17:25 - 04:47:25 -2769
Goldendale 04:32:28 -20.8 Dark Up 47.9 287.2 Up 04:17:28 - 04:47:28 -2823
The Dalles 04:32:29 -20.7 Dark Up 48.0 287.2 Up 04:17:29 - 04:47:29 -2856
Maupin 04:32:31 -21.0 Dark Up 47.8 287.7 Up 04:17:31 - 04:47:31 -2874
Madras/Culver 04:32:34 -21.3 Dark Up 47.7 288.3 Up 04:17:34 - 04:47:34 -2907
Redmond 04:32:37 -21.4 Dark Up 47.6 288.6 Up 04:17:37 - 04:47:37 -2930
Bend 04:32:37 -21.5 Dark Up 47.6 288.8 Up 04:17:37 - 04:47:37 -2950
Sisters 04:32:35 -21.2 Dark Up 47.9 288.4 Up 04:17:35 - 04:47:35 -2952
DCO 04:33:34 -31.6 Dark Up 38.1 299.3 Up 04:18:34 - 04:48:34 -2959
Oregon Observatory 04:32:38 -21.5 Dark Up 47.7 288.9 Up 04:17:38 - 04:47:38 -2968
North Lake 04:32:41 -22.1 Dark Up 47.1 289.8 Up 04:17:41 - 04:47:41 -2973
La Pine/Gilchrist 04:32:39 -21.5 Dark Up 47.6 289.1 Up 04:17:39 - 04:47:39 -2983
Paisley 04:32:46 -22.6 Dark Up 46.6 290.5 Up 04:17:46 - 04:47:46 -2984
Patrick 04:33:31 -31.0 Dark Up 38.7 298.9 Up 04:18:31 - 04:48:31 -2988
Lakeview 04:32:48 -23.0 Dark Up 46.3 291.1 Up 04:17:48 - 04:47:48 -3001
Kingman/Dolan Springs 04:33:32 -31.0 Dark Up 38.7 299.0 Up 04:18:32 - 04:48:32 -3013
Henderson 04:33:27 -29.9 Dark Up 39.8 298.1 Up 04:18:27 - 04:48:27 -3024
Cedarville 04:32:52 -23.5 Dark Up 45.9 291.8 Up 04:17:52 - 04:47:52 -3029
Indian Springs 04:33:24 -29.1 Dark Up 40.6 297.5 Up 04:18:24 - 04:48:24 -3037
Laughlin/Bullhead City 04:33:32 -30.6 Dark Up 39.1 298.9 Up 04:18:32 - 04:48:32 -3048
Tonopah 04:33:15 -27.3 Dark Up 42.4 295.9 Up 04:18:15 - 04:48:15 -3049
Searchlight/Boulder City 04:33:30 -30.2 Dark Up 39.5 298.6 Up 04:18:30 - 04:48:30 -3053
Mohave Valley 04:33:34 -30.8 Dark Up 39.0 299.1 Up 04:18:34 - 04:48:34 -3064
Chiloquin 04:32:44 -21.9 Dark Up 47.5 290.1 Up 04:17:44 - 04:47:44 -3069
Lake Havasu City 04:33:35 -31.2 Dark Up 38.6 299.4 Up 04:18:35 - 04:48:35 -3071
Tulelake 04:32:49 -22.4 Dark Up 47.0 290.9 Up 04:17:49 - 04:47:49 -3082
Klamath Falls 04:32:46 -22.1 Dark Up 47.3 290.5 Up 04:17:46 - 04:47:46 -3084
Beatty 04:33:20 -28.2 Dark Up 41.5 297.0 Up 04:18:20 - 04:48:20 -3088
Parker 04:33:37 -31.4 Dark Up 38.4 299.7 Up 04:18:37 - 04:48:37 -3090
Hawthorne 04:33:11 -26.1 Dark Up 43.6 295.1 Up 04:18:11 - 04:48:11 -3110
Yerington 04:33:07 -25.5 Dark Up 44.2 294.5 Up 04:18:07 - 04:48:07 -3116
Susanville 04:32:58 -23.7 Dark Up 45.8 292.7 Up 04:17:58 - 04:47:58 -3124
Reno 04:33:03 -24.7 Dark Up 44.9 293.8 Up 04:18:03 - 04:48:03 -3124
Fall River/Burney 04:32:54 -22.9 Dark Up 46.6 291.8 Up 04:17:54 - 04:47:54 -3131
Blythe 04:33:40 -31.4 Dark Up 38.3 300.0 Up 04:18:40 - 04:48:40 -3141
Carson City 04:33:06 -24.9 Dark Up 44.7 294.1 Up 04:18:06 - 04:48:06 -3144
Portola 04:33:01 -24.2 Dark Up 45.4 293.3 Up 04:18:01 - 04:48:01 -3148
Gimple 04:32:59 -23.7 Dark Up 45.9 292.9 Up 04:17:59 - 04:47:59 -3153
Gardnerville 04:33:07 -25.1 Dark Up 44.6 294.4 Up 04:18:07 - 04:48:07 -3156
Greenville 04:32:59 -23.7 Dark Up 45.9 292.9 Up 04:17:59 - 04:47:59 -3158
Bishop 04:33:18 -26.8 Dark Up 42.9 296.2 Up 04:18:18 - 04:48:18 -3165
Quincy 04:32:59 -23.8 Dark Up 45.8 293.1 Up 04:17:59 - 04:47:59 -3170
Lee Vining 04:33:12 -26.0 Dark Up 43.7 295.4 Up 04:18:12 - 04:48:12 -3175
Lone Pine 04:33:21 -27.4 Dark Up 42.3 296.9 Up 04:18:21 - 04:48:21 -3189
Yuma 04:33:45 -31.9 Dark Up 37.9 300.6 Up 04:18:45 - 04:48:45 -3199
Calipatria 04:33:42 -31.0 Dark Up 38.8 300.1 Up 04:18:42 - 04:48:42 -3233
Idyllwild 04:33:37 -29.8 Dark Up 39.9 299.4 Up 04:18:37 - 04:48:37 -3275
Wildwood 04:33:32 -28.3 Dark Up 41.5 298.7 Up 04:18:32 - 04:48:32 -3379
CPSLO 04:33:25 -26.2 Dark Up 43.6 297.3 Up 04:18:25 - 04:48:25 -3438

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, (2023/04/01 04:29UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 26.42  66
3Iot Aur       04:56:59.6 +33:09:58  2.7  9.12  58
10Eta Aur      05:06:30.9 +41:14:03  3.2  0.84  56
PPM 047736     05:07:18.4 +42:05:44  8.0  0.07  55
PPM 047743     05:07:49.9 +42:00:40  9.3  0.06  55
181855         05:07:35.0 +42:02:43 15.6        55
Positions are for J2000

Event circumstances last updated at 2019/06/08 04:55:06 UT

Marc W. Buie, Southwest Research Institute

RECON