RECON: TNO occultation with 503858

Event between (503858) 98HQ151 and star UC4-381-118023 with event index number of 227533

Geocentric closest approach at 2018/06/14 09:07:41 UTC

J2000 position of star is 18:34:18.3 -13:49:34
Equinox of date position of star is 18:35:19.2 -13:48:40
Stellar brightness R=15.2, use SENSEUP=128
Star is 170 degrees from the moon. Moon is 1% illuminated.
TNO apparent brightness V=23.9

[RECON map]
TNO is 32.2 AU from the Sun and 31.2 AU from the Earth.
The TNO is moving 22.8 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 141 seconds.
The 1-sigma cross-track error in the shadow position is 1286 km.
The sky-plane scale is 22626.4 km/arcsec.

The TNO has an absolute magnitude Hv=8.8
Diameter=104.7 km assuming a 5% albedo -- 4.6 sec chord
Diameter=42.8 km assuming a 30% albedo -- 1.9 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 503858, (2018/06/14 09:08UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:32.5 -26:28:17  0.9 31.79 157
Nunki          18:56:24.5 -26:16:20  2.0 13.40 167
PPM 234707     18:34:42.3 -14:50:19  6.1  1.04 171
PPM 234699     18:34:25.9 -14:05:33  7.7  0.36 171
PPM 234725     18:35:21.4 -13:28:12  8.8  0.34 170
503858         18:35:21.0 -13:48:38 15.2       170
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 14.5 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 09:07:44 -16.1 AT Down 27.2 181.7 Low 08:55:31 - 09:19:57 9604
Tonasket 09:07:43 -16.4 AT Down 27.5 181.7 Low 08:55:30 - 09:19:56 9592
Okanogan 09:07:44 -16.7 AT Down 27.8 181.5 Low 08:55:31 - 09:19:57 9575
Brewster 09:07:45 -17.0 AT Down 28.1 181.3 Low 08:55:32 - 09:19:58 9560
Manson/Chelan 09:07:46 -17.3 AT Down 28.3 180.9 Low 08:55:33 - 09:19:59 9549
Entiat 09:07:46 -17.5 AT Down 28.5 180.8 Low 08:55:33 - 09:19:59 9537
Wenatchee 09:07:46 -17.8 AT Down 28.8 180.7 Low 08:55:33 - 09:19:59 9523
Ellensburg 09:07:47 -18.2 Dark Down 29.2 180.5 Low 08:55:34 - 09:20:00 9500
Yakima 09:07:47 -18.6 Dark Down 29.6 180.5 Low 08:55:34 - 09:20:00 9478
Toppenish/White Swan 09:07:47 -18.8 Dark Down 29.8 180.7 Low 08:55:34 - 09:20:00 9467
Pasco 09:07:43 -18.6 Dark Down 29.9 182.1 Low 08:55:30 - 09:19:56 9462
PNWRO 09:07:41 -18.8 Dark Down 30.1 182.3 Up 08:55:28 - 09:19:54 9449
George/Umatilla 09:07:43 -19.0 Dark Down 30.2 181.8 Up 08:55:30 - 09:19:56 9443
Goldendale 09:07:48 -19.4 Dark Down 30.4 180.2 Up 08:55:35 - 09:20:01 9435
The Dalles 09:07:48 -19.7 Dark Down 30.6 179.8 Up 08:55:35 - 09:20:01 9421
Maupin 09:07:48 -20.1 Dark Down 31.0 179.9 Up 08:55:35 - 09:20:01 9398
Madras/Culver 09:07:49 -20.6 Dark Down 31.5 179.9 Up 08:55:36 - 09:20:02 9366
Sisters 09:07:51 -21.0 Dark Down 31.9 179.3 Up 08:55:38 - 09:20:04 9346
Redmond 09:07:48 -20.9 Dark Down 31.9 179.8 Up 08:55:35 - 09:20:01 9345
Bend 09:07:50 -21.2 Dark Down 32.1 179.6 Up 08:55:37 - 09:20:03 9332
Oregon Observatory 09:07:51 -21.4 Dark Down 32.3 179.5 Up 08:55:38 - 09:20:04 9322
La Pine/Gilchrist 09:07:50 -21.6 Dark Down 32.5 179.4 Up 08:55:37 - 09:20:03 9309
North Lake 09:07:47 -21.9 Dark Down 32.9 180.1 Up 08:55:34 - 09:20:00 9285
Paisley 09:07:47 -22.3 Dark Down 33.5 180.5 Up 08:55:34 - 09:20:00 9252
Chiloquin 09:07:51 -22.7 Dark Down 33.6 179.0 Up 08:55:38 - 09:20:04 9241
Lakeview 09:07:46 -22.8 Dark Down 34.0 180.7 Up 08:55:33 - 09:19:59 9221
Klamath Falls 09:07:51 -23.0 Dark Down 33.9 179.1 Up 08:55:38 - 09:20:04 9220
Tulelake 09:07:50 -23.2 Dark Down 34.2 179.4 Up 08:55:37 - 09:20:03 9204
Cedarville 09:07:45 -23.4 Dark Down 34.6 181.0 Up 08:55:32 - 09:19:58 9180
Fall River/Burney 09:07:50 -24.1 Dark Down 35.1 179.5 Up 08:55:37 - 09:20:03 9147
Susanville 09:07:47 -24.6 Dark Down 35.8 180.4 Up 08:55:34 - 09:20:00 9108
Gimple 09:07:47 -24.9 Dark Down 36.0 180.2 Up 08:55:34 - 09:20:00 9089
Greenville 09:07:48 -24.9 Dark Down 36.0 180.1 Up 08:55:35 - 09:20:01 9089
Niwot 09:06:51 -20.2 Dark Down 34.2 198.4 Up 08:54:38 - 09:19:04 9082
Quincy 09:07:48 -25.1 Dark Down 36.2 180.1 Up 08:55:35 - 09:20:01 9076
Portola 09:07:46 -25.1 Dark Down 36.4 180.6 Up 08:55:33 - 09:19:59 9069
Reno 09:07:43 -25.2 Dark Down 36.6 181.4 Up 08:55:30 - 09:19:56 9053
Carson City 09:07:43 -25.5 Dark Down 37.0 181.4 Up 08:55:30 - 09:19:56 9029
Yerington 09:07:42 -25.6 Dark Down 37.2 182.2 Up 08:55:29 - 09:19:55 9017
Gardnerville 09:07:43 -25.8 Dark Down 37.2 181.5 Up 08:55:30 - 09:19:56 9012
Hawthorne 09:07:39 -25.9 Dark Down 37.6 182.8 Up 08:55:26 - 09:19:52 8986
Tonopah 09:07:34 -26.0 Dark Down 38.0 184.6 Up 08:55:21 - 09:19:47 8956
Lee Vining 09:07:41 -26.5 Dark Down 38.2 182.3 Up 08:55:28 - 09:19:54 8947
Bishop 09:07:39 -26.9 Dark Down 38.8 183.2 Up 08:55:26 - 09:19:52 8907
Beatty 09:07:32 -26.9 Dark Down 39.1 185.2 Up 08:55:19 - 09:19:45 8877
Indian Springs 09:07:27 -26.9 Dark Down 39.4 186.6 Up 08:55:14 - 09:19:40 8855
Lone Pine 09:07:37 -27.6 Dark Down 39.5 183.6 Up 08:55:24 - 09:19:50 8854
Henderson 09:07:25 -27.2 Dark Down 39.8 187.5 Up 08:55:12 - 09:19:38 8817
Searchlight/Boulder City 09:07:24 -27.7 Dark Down 40.4 187.6 Up 08:55:11 - 09:19:37 8776
Patrick 09:07:20 -27.4 Dark Down 40.3 188.9 Up 08:55:07 - 09:19:33 8772
CPSLO 09:07:47 -29.4 Dark Down 40.9 180.4 Up 08:55:34 - 09:20:00 8756
Kingman/Dolan Springs 09:07:21 -27.7 Dark Down 40.6 188.7 Up 08:55:08 - 09:19:34 8756
Laughlin/Bullhead City 09:07:22 -27.9 Dark Down 40.6 188.1 Up 08:55:09 - 09:19:35 8754
DCO 09:07:17 -27.5 Dark Down 40.5 189.9 Up 08:55:04 - 09:19:30 8750
Mohave Valley 09:07:22 -28.1 Dark Down 40.9 188.1 Up 08:55:09 - 09:19:35 8734
Lake Havasu City 09:07:22 -28.4 Dark Down 41.3 188.5 Up 08:55:09 - 09:19:35 8705
Parker 09:07:21 -28.7 Dark Down 41.6 188.6 Up 08:55:08 - 09:19:34 8679
Wildwood 09:07:38 -30.1 Dark Down 42.0 183.1 Up 08:55:25 - 09:19:51 8672
Idyllwild 09:07:31 -29.9 Dark Down 42.3 185.5 Up 08:55:18 - 09:19:44 8647
Blythe 09:07:22 -29.3 Dark Down 42.2 188.3 Up 08:55:09 - 09:19:35 8640
Calipatria 09:07:25 -30.1 Dark Down 42.8 187.1 Up 08:55:12 - 09:19:38 8602
Yuma 09:07:22 -30.2 Dark Down 43.1 188.3 Up 08:55:09 - 09:19:35 8570

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 503858, (2018/06/14 09:08UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 31.79 157
Nunki          18:55:15.9 -26:17:49  2.0 13.40 167
PPM 234707     18:33:39.1 -14:51:13  6.1  1.04 171
PPM 234699     18:33:23.0 -14:06:27  7.7  0.36 171
PPM 234725     18:34:18.8 -13:29:08  8.8  0.34 170
503858         18:34:18.3 -13:49:34 15.2       170
Positions are for J2000

Event circumstances last updated at 2017/12/04 18:44:48 UT

Marc W. Buie, Southwest Research Institute

RECON