RECON: TNO occultation with 503858

Event between (503858) 98HQ151 and star UC4-381-116631 with event index number of 227547

Geocentric closest approach at 2018/06/21 08:00:02 UTC

J2000 position of star is 18:33:36.0 -13:49:25
Equinox of date position of star is 18:34:37.0 -13:48:31
Stellar brightness R=13.4, use SENSEUP=32
Star is 87 degrees from the moon. Moon is 60% 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 23.5 km/sec on the sky relative to the star, or, 3.7 arcsec/hr.
The 1-sigma error in the time of the event is 137 seconds.
The 1-sigma cross-track error in the shadow position is 1281 km.
The sky-plane scale is 22612.3 km/arcsec.

The TNO has an absolute magnitude Hv=8.8
Diameter=104.7 km assuming a 5% albedo -- 4.5 sec chord
Diameter=42.8 km assuming a 30% albedo -- 1.8 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 503858, (2018/06/21 08:00UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:32.6 -26:28:17  0.9 31.65  60
Nunki          18:56:24.6 -26:16:20  2.0 13.47  92
PPM 234707     18:34:42.4 -14:50:19  6.1  1.03  87
PPM 234699     18:34:26.0 -14:05:33  7.7  0.29  87
503858         18:34:38.8 -13:48:30 13.4        87
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 13.9 km RECON observability=1.0 and success probability=7.3%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 08:00:30 -17.6 AT Up 26.8 171.0 Low 07:48:37 - 08:12:23 3261
Tonasket 08:00:29 -17.9 AT Up 27.0 171.0 Low 07:48:36 - 08:12:22 3249
Okanogan 08:00:30 -18.2 Dark Up 27.4 170.8 Low 07:48:37 - 08:12:23 3231
Brewster 08:00:31 -18.5 Dark Up 27.6 170.6 Low 07:48:38 - 08:12:24 3216
Manson/Chelan 08:00:32 -18.7 Dark Up 27.8 170.2 Low 07:48:39 - 08:12:25 3204
Entiat 08:00:33 -18.9 Dark Up 28.0 170.1 Low 07:48:40 - 08:12:26 3192
Wenatchee 08:00:33 -19.2 Dark Up 28.2 169.9 Low 07:48:40 - 08:12:26 3178
Ellensburg 08:00:34 -19.6 Dark Up 28.6 169.7 Low 07:48:41 - 08:12:27 3155
Yakima 08:00:34 -20.0 Dark Up 29.0 169.6 Low 07:48:41 - 08:12:27 3133
Toppenish/White Swan 08:00:34 -20.2 Dark Up 29.2 169.8 Low 07:48:41 - 08:12:27 3122
Pasco 08:00:30 -20.3 Dark Up 29.5 171.2 Low 07:48:37 - 08:12:23 3119
PNWRO 08:00:29 -20.6 Dark Up 29.8 171.4 Low 07:48:36 - 08:12:22 3105
George/Umatilla 08:00:31 -20.6 Dark Up 29.8 170.9 Low 07:48:38 - 08:12:24 3099
Goldendale 08:00:36 -20.7 Dark Up 29.7 169.3 Low 07:48:43 - 08:12:29 3089
The Dalles 08:00:37 -21.0 Dark Up 29.9 168.8 Low 07:48:44 - 08:12:30 3075
Maupin 08:00:37 -21.4 Dark Up 30.3 168.9 Up 07:48:44 - 08:12:30 3052
Madras/Culver 08:00:37 -21.9 Dark Up 30.9 168.8 Up 07:48:44 - 08:12:30 3020
Redmond 08:00:38 -22.3 Dark Up 31.2 168.7 Up 07:48:45 - 08:12:31 2999
Sisters 08:00:39 -22.2 Dark Up 31.1 168.3 Up 07:48:46 - 08:12:32 2999
Bend 08:00:38 -22.5 Dark Up 31.4 168.5 Up 07:48:45 - 08:12:31 2985
Oregon Observatory 08:00:39 -22.7 Dark Up 31.5 168.3 Up 07:48:46 - 08:12:32 2975
La Pine/Gilchrist 08:00:39 -22.9 Dark Up 31.7 168.3 Up 07:48:46 - 08:12:32 2962
North Lake 08:00:37 -23.3 Dark Up 32.2 168.9 Up 07:48:44 - 08:12:30 2938
Paisley 08:00:36 -23.9 Dark Up 32.8 169.2 Up 07:48:43 - 08:12:29 2905
Chiloquin 08:00:41 -24.0 Dark Up 32.8 167.7 Up 07:48:48 - 08:12:34 2893
Lakeview 08:00:36 -24.4 Dark Up 33.4 169.4 Up 07:48:43 - 08:12:29 2875
Klamath Falls 08:00:41 -24.3 Dark Up 33.1 167.8 Up 07:48:48 - 08:12:34 2872
Tulelake 08:00:40 -24.6 Dark Up 33.4 168.1 Up 07:48:47 - 08:12:33 2856
Cedarville 08:00:36 -25.0 Dark Up 34.0 169.5 Up 07:48:43 - 08:12:29 2834
Fall River/Burney 08:00:40 -25.5 Dark Up 34.3 168.0 Up 07:48:47 - 08:12:33 2799
Susanville 08:00:38 -26.1 Dark Up 35.1 168.8 Up 07:48:45 - 08:12:31 2761
Niwot 07:59:43 -25.1 Dark Down 35.8 187.0 Up 07:47:50 - 08:11:36 2754
Gimple 08:00:39 -26.4 Dark Up 35.3 168.5 Up 07:48:46 - 08:12:32 2742
Greenville 08:00:39 -26.4 Dark Up 35.3 168.4 Up 07:48:46 - 08:12:32 2742
Quincy 08:00:39 -26.6 Dark Up 35.5 168.4 Up 07:48:46 - 08:12:32 2728
Portola 08:00:38 -26.8 Dark Up 35.7 168.9 Up 07:48:45 - 08:12:31 2722
Reno 08:00:36 -27.0 Dark Up 36.0 169.7 Up 07:48:43 - 08:12:29 2706
Carson City 08:00:36 -27.4 Dark Up 36.4 169.6 Up 07:48:43 - 08:12:29 2682
Yerington 08:00:33 -27.6 Dark Up 36.7 170.4 Up 07:48:40 - 08:12:26 2671
Gardnerville 08:00:36 -27.6 Dark Up 36.6 169.7 Up 07:48:43 - 08:12:29 2666
Hawthorne 08:00:32 -28.0 Dark Up 37.2 170.9 Up 07:48:39 - 08:12:25 2641
Tonopah 08:00:27 -28.5 Dark Up 37.8 172.6 Up 07:48:34 - 08:12:20 2613
Lee Vining 08:00:34 -28.6 Dark Up 37.7 170.3 Up 07:48:41 - 08:12:27 2601
Bishop 08:00:31 -29.2 Dark Up 38.4 171.1 Up 07:48:38 - 08:12:24 2562
Beatty 08:00:26 -29.6 Dark Up 39.0 173.0 Up 07:48:33 - 08:12:19 2534
Indian Springs 08:00:22 -29.9 Dark Up 39.4 174.3 Up 07:48:29 - 08:12:15 2513
Lone Pine 08:00:30 -29.9 Dark Up 39.2 171.4 Up 07:48:37 - 08:12:23 2509
Henderson 08:00:19 -30.4 Dark Up 40.0 175.1 Up 07:48:26 - 08:12:12 2476
Searchlight/Boulder City 08:00:19 -30.9 Dark Up 40.6 175.2 Up 07:48:26 - 08:12:12 2435
Patrick 08:00:15 -30.9 Dark Up 40.7 176.5 Up 07:48:22 - 08:12:08 2433
Kingman/Dolan Springs 08:00:15 -31.1 Dark Up 40.9 176.3 Up 07:48:22 - 08:12:08 2416
Laughlin/Bullhead City 08:00:17 -31.2 Dark Up 40.9 175.6 Up 07:48:24 - 08:12:10 2414
DCO 08:00:12 -31.1 Dark Up 41.0 177.4 Up 07:48:19 - 08:12:05 2411
CPSLO 08:00:40 -31.3 Dark Up 40.1 168.0 Up 07:48:47 - 08:12:33 2408
Mohave Valley 08:00:17 -31.5 Dark Up 41.2 175.6 Up 07:48:24 - 08:12:10 2394
Lake Havasu City 08:00:16 -31.9 Dark Up 41.6 175.9 Up 07:48:23 - 08:12:09 2365
Parker 08:00:17 -32.2 Dark Up 41.9 175.9 Up 07:48:24 - 08:12:10 2339
Wildwood 08:00:33 -32.5 Dark Up 41.6 170.4 Up 07:48:40 - 08:12:26 2326
Idyllwild 08:00:26 -32.8 Dark Up 42.2 172.7 Up 07:48:33 - 08:12:19 2304
Blythe 08:00:18 -32.7 Dark Up 42.4 175.5 Up 07:48:25 - 08:12:11 2299
Calipatria 08:00:22 -33.3 Dark Up 42.9 174.2 Up 07:48:29 - 08:12:15 2260
Yuma 08:00:18 -33.7 Dark Up 43.4 175.4 Up 07:48:25 - 08:12:11 2229

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, (2018/06/21 08:00UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 31.65  60
Nunki          18:55:15.9 -26:17:49  2.0 13.47  92
PPM 234707     18:33:39.1 -14:51:13  6.1  1.03  87
PPM 234699     18:33:23.0 -14:06:27  7.7  0.29  87
503858         18:33:36.0 -13:49:25 13.4        87
Positions are for J2000

Event circumstances last updated at 2017/12/04 18:46:12 UT

Marc W. Buie, Southwest Research Institute

RECON