RECON: TNO occultation with 98WV31

Event between 98WV31 and star GA1140:00873958 with event index number of 333089

Geocentric closest approach at 2019/12/18 11:02:12 UTC

J2000 position of star is 04:55:00.1 +24:19:38
Equinox of date position of star is 04:56:09.9 +24:21:24
Stellar brightness G=15.0, use SENSEUP=128
Star is 91 degrees from the moon. Moon is 59% illuminated.
TNO apparent brightness V=24.0

[RECON map]
TNO is 38.8 AU from the Sun and 37.8 AU from the Earth.
The TNO is moving 25.1 km/sec on the sky relative to the star, or, 3.3 arcsec/hr.
The 1-sigma error in the time of the event is 221 seconds.
The 1-sigma cross-track error in the shadow position is 1796 km.
The sky-plane scale is 27407.9 km/arcsec.

The TNO has an absolute magnitude Hv=8.1
Diameter=144.5 km assuming a 5% albedo -- 5.8 sec chord
Diameter=59.0 km assuming a 30% albedo -- 2.4 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 98WV31, (2019/12/18 11:02UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:04.1 +16:32:52  0.8  9.00  97
Alnath         05:27:33.3 +28:37:21  1.6  8.20  83
98 Tau         04:59:22.8 +25:04:46  5.8  1.02  90
PPM 093905     04:57:28.7 +24:37:21  7.0  0.39  91
PPM 093880     04:55:57.8 +24:07:38 11.3  0.24  91
98WV31         04:56:13.1 +24:21:29 15.0        91
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 4.1 sigma about the mid-time.
The median site spacing is 19.9 km RECON observability=1.0 and success probability=10.9%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 10:59:40 -45.3 Dark Up 38.4 262.8 Up 10:44:40 - 11:14:40 -2450
Summerland 10:59:40 -45.6 Dark Up 38.7 262.5 Up 10:44:40 - 11:14:40 -2462
Penticton 10:59:39 -45.5 Dark Up 38.6 262.9 Up 10:44:39 - 11:14:39 -2487
Okanagan Falls 10:59:39 -45.6 Dark Up 38.6 263.1 Up 10:44:39 - 11:14:39 -2504
Oliver 10:59:38 -45.7 Dark Up 38.6 263.2 Up 10:44:38 - 11:14:38 -2519
Anarchist Mountain Observatory 10:59:37 -45.6 Dark Up 38.5 263.5 Up 10:44:37 - 11:14:37 -2530
Oroville 10:59:37 -45.7 Dark Up 38.6 263.5 Up 10:44:37 - 11:14:37 -2539
Tonasket 10:59:37 -45.7 Dark Up 38.6 263.7 Up 10:44:37 - 11:14:37 -2560
Okanogan 10:59:36 -45.9 Dark Up 38.7 263.8 Up 10:44:36 - 11:14:36 -2594
Brewster 10:59:36 -46.1 Dark Up 38.9 263.9 Up 10:44:36 - 11:14:36 -2624
Manson/Chelan 10:59:36 -46.4 Dark Up 39.2 263.8 Up 10:44:36 - 11:14:36 -2651
Entiat 10:59:35 -46.6 Dark Up 39.2 263.9 Up 10:44:35 - 11:14:35 -2673
Wenatchee 10:59:35 -46.7 Dark Up 39.3 264.0 Up 10:44:35 - 11:14:35 -2699
Ellensburg 10:59:35 -47.0 Dark Up 39.5 264.2 Up 10:44:35 - 11:14:35 -2743
Pasco 10:59:31 -46.2 Dark Up 38.6 265.9 Up 10:44:31 - 11:14:31 -2781
Yakima 10:59:34 -47.1 Dark Up 39.6 264.5 Up 10:44:34 - 11:14:34 -2781
Toppenish/White Swan 10:59:33 -47.1 Dark Up 39.5 264.8 Up 10:44:33 - 11:14:33 -2798
PNWRO 10:59:29 -46.2 Dark Up 38.5 266.2 Up 10:44:29 - 11:14:29 -2799
George/Umatilla 10:59:30 -46.5 Dark Up 38.8 266.0 Up 10:44:30 - 11:14:30 -2817
Goldendale 10:59:32 -47.5 Dark Up 39.8 264.9 Up 10:44:32 - 11:14:32 -2860
The Dalles 10:59:33 -47.8 Dark Up 40.1 264.8 Up 10:44:33 - 11:14:33 -2889
Maupin 10:59:31 -47.8 Dark Up 40.1 265.3 Up 10:44:31 - 11:14:31 -2927
Madras/Culver 10:59:30 -48.0 Dark Up 40.1 265.7 Up 10:44:30 - 11:14:30 -2980
Niwot 10:58:56 -37.0 Dark Up 28.3 279.1 Low 10:43:56 - 11:13:56 -2981
SwRI 10:58:56 -37.1 Dark Up 28.3 279.1 Low 10:43:56 - 11:13:56 -2994
Redmond 10:59:29 -48.2 Dark Up 40.2 265.9 Up 10:44:29 - 11:14:29 -3016
Sisters 10:59:30 -48.4 Dark Up 40.5 265.6 Up 10:44:30 - 11:14:30 -3023
Bend 10:59:29 -48.3 Dark Up 40.3 266.0 Up 10:44:29 - 11:14:29 -3040
Oregon Observatory 10:59:29 -48.4 Dark Up 40.4 266.1 Up 10:44:29 - 11:14:29 -3059
La Pine/Gilchrist 10:59:29 -48.5 Dark Up 40.5 266.2 Up 10:44:29 - 11:14:29 -3081
North Lake 10:59:27 -48.2 Dark Up 40.1 267.0 Up 10:44:27 - 11:14:27 -3109
Paisley 10:59:25 -48.1 Dark Up 39.9 267.7 Up 10:44:25 - 11:14:25 -3154
Chiloquin 10:59:27 -49.1 Dark Up 40.8 266.9 Up 10:44:27 - 11:14:27 -3197
Lakeview 10:59:23 -48.1 Dark Up 39.7 268.3 Up 10:44:23 - 11:14:23 -3199
Klamath Falls 10:59:26 -49.1 Dark Up 40.8 267.2 Up 10:44:26 - 11:14:26 -3229
Tulelake 10:59:25 -48.9 Dark Up 40.6 267.7 Up 10:44:25 - 11:14:25 -3248
Cedarville 10:59:22 -48.1 Dark Up 39.6 268.9 Up 10:44:22 - 11:14:22 -3259
Fall River/Burney 10:59:23 -49.1 Dark Up 40.5 268.5 Up 10:44:23 - 11:14:23 -3336
Susanville 10:59:20 -48.7 Dark Up 40.0 269.5 Up 10:44:20 - 11:14:20 -3380
Gimple 10:59:20 -48.9 Dark Up 40.2 269.6 Up 10:44:20 - 11:14:20 -3413
Greenville 10:59:20 -48.9 Dark Up 40.2 269.6 Up 10:44:20 - 11:14:20 -3415
Quincy 10:59:20 -49.0 Dark Up 40.2 269.7 Up 10:44:20 - 11:14:20 -3435
Portola 10:59:19 -48.6 Dark Up 39.9 270.1 Up 10:44:19 - 11:14:19 -3436
Reno 10:59:17 -48.2 Dark Up 39.4 270.8 Up 10:44:17 - 11:14:17 -3446
Carson City 10:59:16 -48.2 Dark Up 39.4 271.1 Up 10:44:16 - 11:14:16 -3481
Yerington 10:59:15 -47.8 Dark Up 38.9 271.6 Up 10:44:15 - 11:14:15 -3484
Gardnerville 10:59:15 -48.2 Dark Up 39.3 271.3 Up 10:44:15 - 11:14:15 -3504
Hawthorne 10:59:13 -47.4 Dark Up 38.4 272.3 Up 10:44:13 - 11:14:13 -3517
Tonopah 10:59:09 -46.4 Dark Up 37.3 273.5 Up 10:44:09 - 11:14:09 -3526
Lee Vining 10:59:13 -47.9 Dark Up 38.8 272.5 Up 10:44:13 - 11:14:13 -3586
Bishop 10:59:10 -47.4 Dark Up 38.2 273.4 Up 10:44:10 - 11:14:10 -3626
Beatty 10:59:06 -46.1 Dark Up 36.9 274.6 Up 10:44:06 - 11:14:06 -3629
Indian Springs 10:59:04 -45.3 Dark Up 36.0 275.5 Up 10:44:04 - 11:14:04 -3631
Henderson 10:59:02 -44.7 Dark Up 35.4 276.2 Up 10:44:02 - 11:14:02 -3665
Lone Pine 10:59:08 -47.2 Dark Up 37.9 274.1 Up 10:44:08 - 11:14:08 -3694
Patrick 10:58:58 -43.8 Dark Up 34.4 277.2 Up 10:43:58 - 11:13:58 -3695
DCO 10:58:57 -43.3 Dark Up 33.8 277.8 Up 10:43:57 - 11:13:57 -3705
Searchlight/Boulder City 10:59:00 -44.7 Dark Up 35.3 276.6 Up 10:44:00 - 11:14:00 -3720
Kingman/Dolan Springs 10:58:58 -44.0 Dark Up 34.6 277.3 Up 10:43:58 - 11:13:58 -3723
Laughlin/Bullhead City 10:58:59 -44.4 Dark Up 35.0 277.0 Up 10:43:59 - 11:13:59 -3740
Mohave Valley 10:58:59 -44.4 Dark Up 34.9 277.2 Up 10:43:59 - 11:13:59 -3767
Lake Havasu City 10:58:58 -44.2 Dark Up 34.7 277.6 Up 10:43:58 - 11:13:58 -3800
Parker 10:58:57 -44.2 Dark Up 34.6 277.9 Up 10:43:57 - 11:13:57 -3835
CPSLO 10:59:11 -49.3 Dark Up 39.9 273.8 Up 10:44:11 - 11:14:11 -3894
Blythe 10:58:56 -44.4 Dark Up 34.8 278.1 Up 10:43:56 - 11:13:56 -3896
Idyllwild 10:59:00 -46.2 Dark Up 36.5 277.0 Up 10:44:00 - 11:14:00 -3946
Wildwood 10:59:05 -47.7 Dark Up 38.1 275.8 Up 10:44:05 - 11:14:05 -3962
Calipatria 10:58:57 -45.2 Dark Up 35.5 278.0 Up 10:43:57 - 11:13:57 -3974
Yuma 10:58:55 -44.5 Dark Up 34.7 278.7 Up 10:43:55 - 11:13:55 -3991

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 98WV31, (2019/12/18 11:02UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8  9.00  97
Alnath         05:26:17.5 +28:36:23  1.6  8.20  83
98 Tau         04:58:09.4 +25:03:00  5.8  1.02  90
PPM 093905     04:56:15.5 +24:35:32  7.0  0.39  91
PPM 093880     04:54:44.9 +24:05:46 11.3  0.24  91
98WV31         04:55:00.1 +24:19:38 15.0        91
Positions are for J2000

Event circumstances last updated at 2019/01/30 20:45:38 UT

Marc W. Buie, Southwest Research Institute

RECON