RECON: TNO occultation with 55638

Event between (55638) 02VE95 and star UC4-487-016786 with event index number of 178026

Geocentric closest approach at 2019/01/11 03:27:38 UTC

J2000 position of star is 06:03:55.0 +07:23:08
Equinox of date position of star is 06:04:53.8 +07:23:01
Stellar brightness R=14.8, use SENSEUP=128
Star is 104 degrees from the moon. Moon is 22% illuminated.
TNO apparent brightness V=20.1

[RECON map]
TNO is 30.0 AU from the Sun and 29.1 AU from the Earth.
The TNO is moving 22.8 km/sec on the sky relative to the star, or, 3.9 arcsec/hr.
The 1-sigma error in the time of the event is 79 seconds.
The 1-sigma cross-track error in the shadow position is 1066 km.
The sky-plane scale is 21094.7 km/arcsec.

The TNO has an absolute magnitude Hv=5.3
Diameter=478.6 km assuming a 5% albedo -- 23.0 sec chord
Diameter=195.4 km assuming a 30% albedo -- 9.4 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 55638, (2019/01/11 03:28UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:12.2 +07:24:33  0.4  2.17 101
Bellatrix      05:26:09.2 +06:21:55  1.6  9.68  94
63 Ori         06:05:59.1 +05:25:02  6.4  1.98 104
PPM 149822     06:04:11.9 +07:37:31  8.0  0.30 103
PPM 149836     06:04:43.9 +07:11:21  9.7  0.20 104
55638          06:04:56.8 +07:23:00 14.8       104
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 5.0 sigma about the mid-time.
The median site spacing is 21.5 km RECON observability=1.0 and success probability=0.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 03:30:14 -30.1 Dark Up 32.5 119.9 Up 03:23:09 - 03:37:20 6313
Tonasket 03:30:15 -30.1 Dark Up 32.6 119.8 Up 03:23:10 - 03:37:21 6293
Okanogan 03:30:16 -30.0 Dark Up 32.7 119.5 Up 03:23:11 - 03:37:22 6264
Brewster 03:30:17 -29.9 Dark Up 32.7 119.1 Up 03:23:12 - 03:37:23 6241
Manson/Chelan 03:30:18 -29.6 Dark Up 32.6 118.7 Up 03:23:13 - 03:37:24 6223
Entiat 03:30:19 -29.6 Dark Up 32.7 118.5 Up 03:23:13 - 03:37:24 6204
Wenatchee 03:30:20 -29.5 Dark Up 32.7 118.2 Up 03:23:15 - 03:37:26 6182
Ellensburg 03:30:21 -29.3 Dark Up 32.8 117.8 Up 03:23:16 - 03:37:27 6146
Yakima 03:30:21 -29.3 Dark Up 33.0 117.6 Up 03:23:16 - 03:37:27 6110
Toppenish/White Swan 03:30:22 -29.4 Dark Up 33.2 117.6 Up 03:23:17 - 03:37:28 6090
Pasco 03:30:20 -30.3 Dark Up 34.0 118.7 Up 03:23:14 - 03:37:25 6077
PNWRO 03:30:20 -30.5 Dark Up 34.3 118.8 Up 03:23:14 - 03:37:25 6055
George/Umatilla 03:30:21 -30.1 Dark Up 34.0 118.3 Up 03:23:15 - 03:37:26 6048
Goldendale 03:30:24 -29.1 Dark Up 33.2 116.9 Up 03:23:19 - 03:37:30 6042
The Dalles 03:30:26 -28.9 Dark Up 33.0 116.4 Up 03:23:21 - 03:37:32 6023
Maupin 03:30:27 -28.9 Dark Up 33.3 116.3 Up 03:23:22 - 03:37:33 5985
Madras/Culver 03:30:28 -28.9 Dark Up 33.5 115.9 Up 03:23:22 - 03:37:33 5935
Sisters 03:30:29 -28.5 Dark Up 33.4 115.3 Up 03:23:24 - 03:37:35 5906
Redmond 03:30:29 -28.8 Dark Up 33.6 115.7 Up 03:23:23 - 03:37:34 5903
Bend 03:30:29 -28.7 Dark Up 33.6 115.4 Up 03:23:24 - 03:37:35 5884
Oregon Observatory 03:30:30 -28.6 Dark Up 33.6 115.2 Up 03:23:24 - 03:37:35 5868
La Pine/Gilchrist 03:30:31 -28.5 Dark Up 33.7 115.0 Up 03:23:25 - 03:37:36 5849
North Lake 03:30:31 -29.0 Dark Up 34.3 115.3 Up 03:23:25 - 03:37:36 5808
Paisley 03:30:31 -29.2 Dark Up 34.7 115.3 Up 03:23:25 - 03:37:36 5756
Chiloquin 03:30:34 -28.2 Dark Up 33.9 114.0 Up 03:23:28 - 03:37:39 5747
Klamath Falls 03:30:34 -28.2 Dark Up 34.1 113.9 Up 03:23:29 - 03:37:40 5715
Lakeview 03:30:31 -29.3 Dark Up 35.1 115.1 Up 03:23:26 - 03:37:37 5708
Tulelake 03:30:34 -28.5 Dark Up 34.4 114.0 Up 03:23:29 - 03:37:40 5689
Cedarville 03:30:32 -29.4 Dark Up 35.5 114.9 Up 03:23:26 - 03:37:37 5647
Fall River/Burney 03:30:36 -28.4 Dark Up 34.9 113.5 Up 03:23:30 - 03:37:41 5604
Susanville 03:30:35 -28.9 Dark Up 35.6 113.7 Up 03:23:29 - 03:37:40 5542
Greenville 03:30:37 -28.7 Dark Up 35.5 113.3 Up 03:23:31 - 03:37:42 5517
Gimple 03:30:36 -28.8 Dark Up 35.6 113.4 Up 03:23:31 - 03:37:42 5516
Niwot 03:29:52 -40.6 Dark Up 45.8 128.6 Up 03:22:47 - 03:36:58 5507
Quincy 03:30:37 -28.7 Dark Up 35.6 113.2 Up 03:23:31 - 03:37:42 5497
Portola 03:30:36 -29.0 Dark Up 36.0 113.5 Up 03:23:30 - 03:37:41 5484
Reno 03:30:35 -29.5 Dark Up 36.6 113.9 Up 03:23:30 - 03:37:41 5457
Carson City 03:30:36 -29.5 Dark Up 36.7 113.6 Up 03:23:30 - 03:37:41 5423
Yerington 03:30:34 -30.0 Dark Up 37.2 114.1 Up 03:23:29 - 03:37:40 5402
Gardnerville 03:30:36 -29.5 Dark Up 36.8 113.5 Up 03:23:30 - 03:37:41 5399
Hawthorne 03:30:34 -30.3 Dark Up 37.8 114.2 Up 03:23:28 - 03:37:39 5357
Tonopah 03:30:31 -31.4 Dark Up 39.0 115.1 Up 03:23:25 - 03:37:36 5309
Lee Vining 03:30:36 -29.9 Dark Up 37.7 113.4 Up 03:23:30 - 03:37:41 5302
Bishop 03:30:35 -30.4 Dark Up 38.5 113.6 Up 03:23:30 - 03:37:41 5243
Beatty 03:30:31 -31.7 Dark Up 39.8 114.6 Up 03:23:26 - 03:37:37 5195
Lone Pine 03:30:36 -30.6 Dark Up 39.0 113.3 Up 03:23:30 - 03:37:41 5167
Indian Springs 03:30:29 -32.5 Dark Up 40.7 115.3 Up 03:23:23 - 03:37:34 5161
Henderson 03:30:28 -33.0 Dark Up 41.5 115.5 Up 03:23:22 - 03:37:33 5107
Searchlight/Boulder City 03:30:28 -33.0 Dark Up 41.8 115.1 Up 03:23:23 - 03:37:34 5050
Patrick 03:30:25 -33.9 Dark Up 42.6 116.0 Up 03:23:20 - 03:37:31 5044
CPSLO 03:30:45 -28.4 Dark Up 37.6 110.2 Up 03:23:39 - 03:37:50 5043
Kingman/Dolan Springs 03:30:26 -33.7 Dark Up 42.5 115.7 Up 03:23:21 - 03:37:32 5022
Laughlin/Bullhead City 03:30:28 -33.3 Dark Up 42.1 115.2 Up 03:23:22 - 03:37:33 5020
DCO 03:30:24 -34.4 Dark Up 43.2 116.4 Up 03:23:18 - 03:37:29 5013
Mohave Valley 03:30:28 -33.2 Dark Up 42.3 115.0 Up 03:23:23 - 03:37:34 4993
Lake Havasu City 03:30:28 -33.4 Dark Up 42.6 114.9 Up 03:23:23 - 03:37:34 4952
Wildwood 03:30:41 -29.9 Dark Up 39.6 111.0 Up 03:23:35 - 03:37:46 4918
Parker 03:30:28 -33.4 Dark Up 42.8 114.6 Up 03:23:23 - 03:37:34 4917
Idyllwild 03:30:36 -31.4 Dark Up 41.1 112.2 Up 03:23:30 - 03:37:41 4878
Blythe 03:30:30 -33.1 Dark Up 42.8 113.9 Up 03:23:24 - 03:37:35 4864
Calipatria 03:30:33 -32.3 Dark Up 42.3 112.7 Up 03:23:28 - 03:37:39 4815
Yuma 03:30:31 -33.0 Dark Up 43.1 113.1 Up 03:23:26 - 03:37:37 4770

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 55638, (2019/01/11 03:28UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  2.17 101
Bellatrix      05:25:07.8 +06:20:58  1.6  9.68  94
63 Ori         06:04:58.1 +05:25:12  6.4  1.98 104
PPM 149822     06:03:10.0 +07:37:37  8.0  0.30 103
PPM 149836     06:03:42.2 +07:11:28  9.7  0.20 104
55638          06:03:55.0 +07:23:08 14.8       104
Positions are for J2000

Event circumstances last updated at 2018/02/14 17:18:31 UT

Marc W. Buie, Southwest Research Institute

RECON