RECON: TNO occultation with 55638

Event between (55638) 02VE95 and star UC4-489-015235 with event index number of 101229

Geocentric closest approach at 2018/01/16 08:44:15 UTC

J2000 position of star is 05:53:20.6 +07:38:07
Equinox of date position of star is 05:54:17.2 +07:38:16
Stellar brightness R=15.1, use SENSEUP=128
Star is 156 degrees from the moon. Moon is 1% illuminated.
TNO apparent brightness V=20.3

[RECON map]
TNO is 29.8 AU from the Sun and 28.9 AU from the Earth.
The TNO is moving 21.1 km/sec on the sky relative to the star, or, 3.6 arcsec/hr.
The 1-sigma error in the time of the event is 82 seconds.
The 1-sigma cross-track error in the shadow position is 1056 km.
The sky-plane scale is 20982.3 km/arcsec.

The TNO has an absolute magnitude Hv=5.5
Diameter=478.6 km assuming a 5% albedo -- 22.6 sec chord
Diameter=195.4 km assuming a 30% albedo -- 9.2 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 55638, (2018/01/16 08:44UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:08.9 +07:24:32  0.4  0.51 156
Bellatrix      05:26:06.0 +06:21:53  1.6  7.12 150
52 Ori         05:48:58.4 +06:27:33  5.5  1.78 154
PPM 149627     05:55:27.6 +08:03:23  7.2  0.50 157
PPM 149617     05:55:02.3 +07:42:56  9.5  0.19 156
PPM 149610     05:54:38.2 +07:34:45 10.7  0.10 156
55638          05:54:19.4 +07:38:16 15.1       156
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 17.6 km RECON observability=1.0 and success probability=0.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 08:42:40 -61.1 Dark Down 37.5 231.3 Up 08:35:20 - 08:50:00 10117
Tonasket 08:42:38 -61.3 Dark Down 37.6 231.4 Up 08:35:18 - 08:49:58 10100
Okanogan 08:42:38 -61.7 Dark Down 37.9 231.4 Up 08:35:18 - 08:49:58 10073
Brewster 08:42:38 -62.0 Dark Down 38.2 231.4 Up 08:35:18 - 08:49:58 10050
Manson/Chelan 08:42:38 -62.3 Dark Down 38.5 231.1 Up 08:35:18 - 08:49:58 10030
Entiat 08:42:38 -62.5 Dark Down 38.7 231.2 Up 08:35:18 - 08:49:58 10012
Wenatchee 08:42:37 -62.7 Dark Down 38.9 231.2 Up 08:35:17 - 08:49:57 9992
Ellensburg 08:42:36 -63.2 Dark Down 39.3 231.2 Up 08:35:16 - 08:49:56 9957
Yakima 08:42:35 -63.6 Dark Down 39.6 231.5 Up 08:35:15 - 08:49:55 9926
Pasco 08:42:30 -63.6 Dark Down 39.0 233.2 Up 08:35:10 - 08:49:50 9921
Toppenish/White Swan 08:42:34 -63.8 Dark Down 39.6 231.8 Up 08:35:14 - 08:49:54 9912
PNWRO 08:42:29 -63.8 Dark Down 39.0 233.6 Up 08:35:09 - 08:49:49 9905
George/Umatilla 08:42:30 -64.0 Dark Down 39.3 233.2 Up 08:35:10 - 08:49:50 9892
Goldendale 08:42:34 -64.4 Dark Down 40.2 231.7 Up 08:35:14 - 08:49:54 9863
The Dalles 08:42:34 -64.7 Dark Down 40.5 231.5 Up 08:35:14 - 08:49:54 9840
Maupin 08:42:34 -65.0 Dark Down 40.7 231.9 Up 08:35:14 - 08:49:54 9809
Madras/Culver 08:42:31 -65.6 Dark Down 41.1 232.2 Up 08:35:11 - 08:49:51 9765
Redmond 08:42:31 -65.9 Dark Down 41.3 232.4 Up 08:35:11 - 08:49:51 9736
Sisters 08:42:33 -66.0 Dark Down 41.6 231.9 Up 08:35:13 - 08:49:53 9732
Bend 08:42:31 -66.2 Dark Down 41.6 232.4 Up 08:35:11 - 08:49:51 9717
Oregon Observatory 08:42:30 -66.4 Dark Down 41.7 232.3 Up 08:35:10 - 08:49:50 9701
La Pine/Gilchrist 08:42:30 -66.6 Dark Down 41.9 232.4 Up 08:35:10 - 08:49:50 9683
North Lake 08:42:28 -66.9 Dark Down 41.8 233.4 Up 08:35:08 - 08:49:48 9657
Niwot 08:41:36 -62.7 Dark Down 33.1 250.1 Up 08:34:16 - 08:48:56 9652
Paisley 08:42:25 -67.3 Dark Down 41.9 234.1 Up 08:35:05 - 08:49:45 9618
Chiloquin 08:42:28 -67.7 Dark Down 42.8 232.8 Up 08:35:08 - 08:49:48 9587
Lakeview 08:42:23 -67.7 Dark Down 42.1 234.7 Up 08:35:03 - 08:49:43 9579
Klamath Falls 08:42:28 -68.0 Dark Down 42.9 233.2 Up 08:35:08 - 08:49:48 9560
Tulelake 08:42:26 -68.2 Dark Down 42.9 233.7 Up 08:35:06 - 08:49:46 9543
Cedarville 08:42:21 -68.3 Dark Down 42.4 235.4 Up 08:35:01 - 08:49:41 9528
Fall River/Burney 08:42:23 -69.1 Dark Down 43.4 234.5 Up 08:35:03 - 08:49:43 9468
Susanville 08:42:20 -69.5 Dark Down 43.3 235.7 Up 08:35:00 - 08:49:40 9427
Gimple 08:42:19 -69.8 Dark Down 43.6 235.7 Up 08:34:59 - 08:49:39 9400
Greenville 08:42:20 -69.8 Dark Down 43.7 235.6 Up 08:35:00 - 08:49:40 9399
Quincy 08:42:20 -70.0 Dark Down 43.8 235.8 Up 08:35:00 - 08:49:40 9381
Portola 08:42:17 -70.0 Dark Down 43.6 236.4 Up 08:34:57 - 08:49:37 9379
Reno 08:42:15 -70.1 Dark Down 43.3 237.2 Up 08:34:55 - 08:49:35 9366
Carson City 08:42:15 -70.4 Dark Down 43.5 237.6 Up 08:34:55 - 08:49:35 9336
Yerington 08:42:10 -70.4 Dark Down 43.2 238.3 Up 08:34:50 - 08:49:30 9330
Gardnerville 08:42:13 -70.6 Dark Down 43.6 237.8 Up 08:34:53 - 08:49:33 9316
Hawthorne 08:42:09 -70.6 Dark Down 43.1 239.2 Up 08:34:49 - 08:49:29 9298
Tonopah 08:42:02 -70.5 Dark Down 42.3 241.0 Up 08:34:42 - 08:49:22 9282
Lee Vining 08:42:08 -71.3 Dark Down 43.7 239.2 Up 08:34:48 - 08:49:28 9242
Bishop 08:42:04 -71.5 Dark Down 43.5 240.4 Up 08:34:44 - 08:49:24 9201
Beatty 08:41:59 -71.2 Dark Down 42.6 242.3 Up 08:34:39 - 08:49:19 9188
Indian Springs 08:41:54 -71.0 Dark Down 42.0 243.6 Up 08:34:34 - 08:49:14 9178
Henderson 08:41:50 -71.1 Dark Down 41.7 244.6 Up 08:34:30 - 08:49:10 9142
Lone Pine 08:42:01 -72.0 Dark Down 43.6 241.3 Up 08:34:41 - 08:49:21 9140
Patrick 08:41:45 -70.9 Dark Down 41.2 246.1 Up 08:34:25 - 08:49:05 9106
Searchlight/Boulder City 08:41:49 -71.5 Dark Down 41.9 245.1 Up 08:34:29 - 08:49:09 9093
DCO 08:41:42 -70.7 Dark Down 40.8 246.9 Up 08:34:22 - 08:49:02 9091
Kingman/Dolan Springs 08:41:45 -71.2 Dark Down 41.4 246.1 Up 08:34:25 - 08:49:05 9083
Laughlin/Bullhead City 08:41:47 -71.5 Dark Down 41.8 245.7 Up 08:34:27 - 08:49:07 9072
Mohave Valley 08:41:47 -71.7 Dark Down 41.9 245.9 Up 08:34:27 - 08:49:07 9047
Lake Havasu City 08:41:45 -71.8 Dark Down 41.9 246.5 Up 08:34:25 - 08:49:05 9016
Parker 08:41:44 -72.1 Dark Down 42.0 246.8 Up 08:34:24 - 08:49:04 8985
CPSLO 08:42:06 -74.2 Dark Down 46.1 239.9 Up 08:34:46 - 08:49:26 8979
Blythe 08:41:43 -72.6 Dark Down 42.4 246.9 Up 08:34:23 - 08:49:03 8932
Idyllwild 08:41:50 -73.7 Dark Down 44.0 245.0 Up 08:34:30 - 08:49:10 8906
Wildwood 08:41:57 -74.4 Dark Down 45.2 243.0 Up 08:34:37 - 08:49:17 8905
Calipatria 08:41:45 -73.5 Dark Down 43.3 246.6 Up 08:34:25 - 08:49:05 8870
Yuma 08:41:41 -73.3 Dark Down 42.8 247.7 Up 08:34:21 - 08:49:01 8847

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, (2018/01/16 08:44UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  0.51 156
Bellatrix      05:25:07.8 +06:20:58  1.6  7.12 150
52 Ori         05:48:00.2 +06:27:15  5.5  1.78 154
PPM 149627     05:54:28.7 +08:03:15  7.2  0.50 157
PPM 149617     05:54:03.6 +07:42:48  9.5  0.19 156
PPM 149610     05:53:39.5 +07:34:36 10.7  0.10 156
55638          05:53:20.6 +07:38:07 15.1       156
Positions are for J2000

Event circumstances last updated at 2017/05/17 17:59:25 UT

Marc W. Buie, Southwest Research Institute

RECON