RECON: TNO occultation with 495603

Event between (495603) 15AM281 and star UC4-640-045324 with event index number of 200793

Geocentric closest approach at 2018/03/25 06:32:37 UTC

J2000 position of star is 10:04:45.2 +37:50:06
Equinox of date position of star is 10:05:48.0 +37:44:57
Stellar brightness R=16.5, use SENSEUP=128
Star is 45 degrees from the moon. Moon is 57% illuminated.
TNO apparent brightness V=21.3

[RECON map]
TNO is 43.7 AU from the Sun and 43.0 AU from the Earth.
The TNO is moving 19.2 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 113 seconds.
The 1-sigma cross-track error in the shadow position is 1900 km.
The sky-plane scale is 31187.4 km/arcsec.

The TNO has an absolute magnitude Hv=4.8
Diameter=660.7 km assuming a 5% albedo -- 34.4 sec chord
Diameter=269.7 km assuming a 30% albedo -- 14.0 sec chord
Dynamical classification is 5:2EEE+5:2EII
 
 
 
 
 
 

Star training set for 495603, (2018/03/25 06:33UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:20.5 +11:52:39  1.3 25.88  47
Merak          11:02:55.8 +56:17:03  2.4 20.84  58
21 LMi         10:08:30.0 +35:09:18  4.6  2.65  45
PPM 074956     10:04:58.6 +37:55:52  7.2  0.25  45
PPM 074970     10:06:23.3 +37:33:20  9.1  0.22  45
495603         10:05:50.3 +37:44:45 16.5        45
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 27.7 km RECON observability=1.0 and success probability=2.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 06:31:51 -35.5 Dark Up 76.8 216.8 Up 06:21:55 - 06:41:47 6862
Tonasket 06:31:52 -35.7 Dark Up 76.9 217.4 Up 06:21:56 - 06:41:48 6837
Okanogan 06:31:52 -35.9 Dark Up 77.3 217.9 Up 06:21:56 - 06:41:48 6800
Brewster 06:31:53 -36.1 Dark Up 77.6 218.0 Up 06:21:57 - 06:41:49 6771
Manson/Chelan 06:31:54 -36.2 Dark Up 77.9 217.4 Up 06:21:58 - 06:41:50 6749
Entiat 06:31:55 -36.4 Dark Up 78.1 217.9 Up 06:21:59 - 06:41:51 6725
Wenatchee 06:31:55 -36.5 Dark Up 78.3 218.3 Up 06:21:59 - 06:41:51 6697
Ellensburg 06:31:56 -36.8 Dark Up 78.7 218.8 Up 06:22:00 - 06:41:52 6652
Yakima 06:31:56 -37.2 Dark Up 79.1 220.1 Up 06:22:00 - 06:41:52 6607
Toppenish/White Swan 06:31:55 -37.4 Dark Up 79.1 221.4 Up 06:21:59 - 06:41:51 6583
Pasco 06:31:50 -37.9 Dark Up 78.6 225.9 Up 06:21:54 - 06:41:46 6568
PNWRO 06:31:49 -38.2 Dark Up 78.7 227.5 Up 06:21:53 - 06:41:45 6540
George/Umatilla 06:31:51 -38.2 Dark Up 79.0 226.4 Up 06:21:55 - 06:41:47 6531
Goldendale 06:31:57 -37.7 Dark Up 79.7 221.9 Up 06:22:01 - 06:41:53 6523
The Dalles 06:31:59 -37.8 Dark Up 80.1 221.4 Up 06:22:03 - 06:41:55 6499
Maupin 06:31:58 -38.2 Dark Up 80.3 223.4 Up 06:22:02 - 06:41:54 6453
Madras/Culver 06:31:59 -38.6 Dark Up 80.8 225.6 Up 06:22:03 - 06:41:55 6393
Sisters 06:32:00 -38.7 Dark Up 81.2 225.4 Up 06:22:04 - 06:41:56 6357
Redmond 06:31:59 -38.9 Dark Up 81.0 227.0 Up 06:22:03 - 06:41:55 6353
Bend 06:31:59 -39.0 Dark Up 81.2 227.5 Up 06:22:03 - 06:41:55 6330
Oregon Observatory 06:31:59 -39.1 Dark Up 81.4 227.8 Up 06:22:03 - 06:41:55 6311
La Pine/Gilchrist 06:32:00 -39.3 Dark Up 81.6 228.6 Up 06:22:04 - 06:41:56 6289
North Lake 06:31:58 -39.9 Dark Up 81.5 233.2 Up 06:22:02 - 06:41:54 6239
Paisley 06:31:56 -40.5 Dark Up 81.6 237.5 Up 06:22:00 - 06:41:52 6177
Chiloquin 06:32:02 -40.1 Dark Up 82.5 233.5 Up 06:22:06 - 06:41:58 6167
Klamath Falls 06:32:02 -40.4 Dark Up 82.6 235.9 Up 06:22:06 - 06:41:58 6129
Lakeview 06:31:56 -41.0 Dark Up 81.8 241.1 Up 06:22:00 - 06:41:52 6121
Tulelake 06:32:00 -40.7 Dark Up 82.6 238.8 Up 06:22:04 - 06:41:56 6098
Cedarville 06:31:55 -41.6 Dark Up 82.0 245.7 Up 06:21:59 - 06:41:51 6047
Fall River/Burney 06:32:00 -41.5 Dark Up 83.0 245.4 Up 06:22:04 - 06:41:56 5997
Niwot 06:30:50 -47.3 Dark Up 71.2 270.8 Up 06:20:54 - 06:40:46 5958
Susanville 06:31:57 -42.4 Dark Up 82.7 252.2 Up 06:22:01 - 06:41:53 5925
Greenville 06:31:59 -42.5 Dark Up 83.0 253.6 Up 06:22:03 - 06:41:55 5895
Gimple 06:31:58 -42.5 Dark Up 82.9 253.8 Up 06:22:02 - 06:41:54 5895
Quincy 06:31:59 -42.6 Dark Up 83.0 255.2 Up 06:22:03 - 06:41:55 5873
Portola 06:31:56 -42.9 Dark Up 82.7 257.1 Up 06:22:00 - 06:41:52 5857
Reno 06:31:53 -43.4 Dark Up 82.3 260.2 Up 06:21:57 - 06:41:49 5827
Carson City 06:31:53 -43.7 Dark Up 82.3 262.9 Up 06:21:57 - 06:41:49 5787
Yerington 06:31:51 -44.2 Dark Up 81.9 265.1 Up 06:21:55 - 06:41:47 5764
Gardnerville 06:31:53 -44.0 Dark Up 82.3 264.8 Up 06:21:57 - 06:41:49 5759
Hawthorne 06:31:49 -44.8 Dark Up 81.5 268.7 Up 06:21:53 - 06:41:45 5712
Tonopah 06:31:42 -45.7 Dark Up 80.4 272.4 Up 06:21:46 - 06:41:38 5660
Lee Vining 06:31:50 -45.0 Dark Up 81.9 272.3 Up 06:21:54 - 06:41:46 5650
Bishop 06:31:47 -45.9 Dark Up 81.2 276.4 Up 06:21:51 - 06:41:43 5583
Beatty 06:31:40 -46.9 Dark Up 79.9 279.1 Up 06:21:44 - 06:41:36 5532
Lone Pine 06:31:45 -46.6 Dark Up 80.9 281.2 Up 06:21:49 - 06:41:41 5498
Indian Springs 06:31:36 -47.6 Dark Up 79.0 280.7 Up 06:21:40 - 06:41:32 5497
Henderson 06:31:32 -48.4 Dark Up 78.4 283.2 Up 06:21:36 - 06:41:28 5439
Searchlight/Boulder City 06:31:32 -48.9 Dark Up 78.2 285.8 Up 06:21:36 - 06:41:28 5376
Patrick 06:31:27 -49.3 Dark Up 77.4 285.6 Up 06:21:31 - 06:41:23 5373
CPSLO 06:31:58 -46.5 Dark Up 82.5 292.3 Up 06:22:02 - 06:41:54 5358
Kingman/Dolan Springs 06:31:28 -49.5 Dark Up 77.4 286.6 Up 06:21:32 - 06:41:24 5348
Laughlin/Bullhead City 06:31:30 -49.3 Dark Up 77.8 287.0 Up 06:21:34 - 06:41:26 5344
DCO 06:31:23 -49.9 Dark Up 76.7 286.6 Up 06:21:27 - 06:41:19 5342
Mohave Valley 06:31:30 -49.5 Dark Up 77.7 288.2 Up 06:21:34 - 06:41:26 5314
Lake Havasu City 06:31:28 -50.0 Dark Up 77.4 289.8 Up 06:21:32 - 06:41:24 5270
Parker 06:31:28 -50.3 Dark Up 77.3 291.2 Up 06:21:32 - 06:41:24 5231
Wildwood 06:31:48 -48.5 Dark Up 80.5 296.2 Up 06:21:52 - 06:41:44 5220
Idyllwild 06:31:40 -49.6 Dark Up 78.9 295.4 Up 06:21:44 - 06:41:36 5181
Blythe 06:31:30 -50.6 Dark Up 77.3 293.6 Up 06:21:34 - 06:41:26 5172
Calipatria 06:31:34 -50.7 Dark Up 77.8 296.6 Up 06:21:38 - 06:41:30 5115
Yuma 06:31:30 -51.4 Dark Up 76.9 297.3 Up 06:21:34 - 06:41:26 5070

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 495603, (2018/03/25 06:33UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:22.0 +11:58:02  1.3 25.88  47
Merak          11:01:50.7 +56:22:57  2.4 20.84  58
21 LMi         10:07:25.9 +35:14:41  4.6  2.65  45
PPM 074956     10:03:53.4 +38:01:12  7.2  0.25  45
PPM 074970     10:05:18.3 +37:38:41  9.1  0.22  45
495603         10:04:45.2 +37:50:06 16.5        45
Positions are for J2000

Event circumstances last updated at 2017/08/01 16:35:56 UT

Marc W. Buie, Southwest Research Institute

RECON