RECON: TNO occultation with 50000

Event between (50000) Quaoar and star UC4-374-112195 with event index number of 198076

Geocentric closest approach at 2019/06/11 08:30:51 UTC

J2000 position of star is 18:09:38.4 -15:17:58
Equinox of date position of star is 18:10:40.0 -15:17:42
Stellar brightness R=16.5, use SENSEUP=128
Star is 87 degrees from the moon. Moon is 63% illuminated.
TNO apparent brightness V=18.7

[RECON map]
TNO is 42.9 AU from the Sun and 41.9 AU from the Earth.
The TNO is moving 24.0 km/sec on the sky relative to the star, or, 2.8 arcsec/hr.
The 1-sigma error in the time of the event is 101 seconds.
The 1-sigma cross-track error in the shadow position is 1525 km.
The sky-plane scale is 30370.5 km/arcsec.

The TNO has an absolute magnitude Hv=2.4
Diameter=1995.3 km assuming a 5% albedo -- 83.0 sec chord
Diameter=814.6 km assuming a 30% albedo -- 33.9 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 50000, (2019/06/11 08:31UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:36.2 -26:28:25  0.9 25.86  66
35Eta Oph      17:11:29.7 -15:44:52  2.6 14.28  73
PPM 234113     18:10:49.6 -13:55:47  6.4  1.37  87
PPM 234112     18:10:49.9 -15:16:39  7.7  0.03  87
50000          18:10:45.2 -15:17:41 16.5        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 14.2 km RECON observability=1.0 and success probability=6.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 08:31:12 -17.6 AT Up 25.6 175.0 Low 08:22:18 - 08:40:06 3718
Tonasket 08:31:12 -17.8 AT Up 25.9 175.0 Low 08:22:18 - 08:40:06 3707
Okanogan 08:31:12 -18.2 Dark Up 26.2 174.8 Low 08:22:18 - 08:40:06 3690
Brewster 08:31:13 -18.5 Dark Up 26.5 174.6 Low 08:22:19 - 08:40:07 3676
Manson/Chelan 08:31:14 -18.7 Dark Up 26.6 174.2 Low 08:22:20 - 08:40:08 3664
Entiat 08:31:14 -18.9 Dark Up 26.8 174.1 Low 08:22:20 - 08:40:08 3653
Wenatchee 08:31:15 -19.2 Dark Up 27.1 174.0 Low 08:22:21 - 08:40:09 3639
Ellensburg 08:31:15 -19.6 Dark Up 27.5 173.8 Low 08:22:21 - 08:40:09 3617
Yakima 08:31:15 -20.0 Dark Up 27.9 173.7 Low 08:22:21 - 08:40:09 3596
Toppenish/White Swan 08:31:15 -20.2 Dark Up 28.1 173.9 Low 08:22:21 - 08:40:09 3585
Pasco 08:31:11 -20.2 Dark Up 28.3 175.2 Low 08:22:17 - 08:40:05 3583
PNWRO 08:31:10 -20.4 Dark Up 28.6 175.5 Low 08:22:16 - 08:40:04 3571
George/Umatilla 08:31:12 -20.6 Dark Up 28.6 175.0 Low 08:22:18 - 08:40:06 3564
Goldendale 08:31:16 -20.8 Dark Up 28.6 173.4 Low 08:22:22 - 08:40:10 3554
The Dalles 08:31:18 -21.1 Dark Up 28.8 173.0 Low 08:22:24 - 08:40:12 3540
Maupin 08:31:18 -21.5 Dark Up 29.3 173.1 Low 08:22:24 - 08:40:12 3518
Madras/Culver 08:31:18 -22.0 Dark Up 29.8 173.0 Low 08:22:24 - 08:40:12 3487
Redmond 08:31:18 -22.4 Dark Up 30.1 172.9 Up 08:22:24 - 08:40:12 3467
Sisters 08:31:20 -22.4 Dark Up 30.1 172.5 Up 08:22:26 - 08:40:14 3466
Bend 08:31:19 -22.6 Dark Up 30.3 172.7 Up 08:22:25 - 08:40:13 3454
Oregon Observatory 08:31:19 -22.8 Dark Up 30.5 172.6 Up 08:22:25 - 08:40:13 3443
La Pine/Gilchrist 08:31:19 -23.0 Dark Up 30.7 172.5 Up 08:22:25 - 08:40:13 3431
North Lake 08:31:18 -23.4 Dark Up 31.2 173.1 Up 08:22:24 - 08:40:12 3409
Paisley 08:31:16 -23.9 Dark Up 31.8 173.5 Up 08:22:22 - 08:40:10 3378
Chiloquin 08:31:21 -24.1 Dark Up 31.8 172.0 Up 08:22:27 - 08:40:15 3365
Lakeview 08:31:16 -24.4 Dark Up 32.3 173.7 Up 08:22:22 - 08:40:10 3348
Klamath Falls 08:31:21 -24.5 Dark Up 32.1 172.1 Up 08:22:27 - 08:40:15 3345
Tulelake 08:31:20 -24.7 Dark Up 32.4 172.4 Up 08:22:26 - 08:40:14 3330
Cedarville 08:31:15 -25.0 Dark Up 33.0 173.8 Up 08:22:21 - 08:40:09 3309
Fall River/Burney 08:31:20 -25.6 Dark Up 33.3 172.4 Up 08:22:26 - 08:40:14 3275
Niwot 08:30:24 -23.4 Dark Down 33.9 191.0 Up 08:21:30 - 08:39:18 3239
Susanville 08:31:18 -26.2 Dark Up 34.0 173.2 Up 08:22:24 - 08:40:12 3238
Gimple 08:31:18 -26.4 Dark Up 34.3 172.9 Up 08:22:24 - 08:40:12 3220
Greenville 08:31:19 -26.5 Dark Up 34.3 172.8 Up 08:22:25 - 08:40:13 3220
Quincy 08:31:19 -26.7 Dark Up 34.5 172.8 Up 08:22:25 - 08:40:13 3207
Portola 08:31:17 -26.7 Dark Up 34.6 173.4 Up 08:22:23 - 08:40:11 3201
Reno 08:31:15 -26.9 Dark Up 35.0 174.1 Up 08:22:21 - 08:40:09 3187
Carson City 08:31:15 -27.3 Dark Up 35.3 174.1 Up 08:22:21 - 08:40:09 3164
Yerington 08:31:12 -27.4 Dark Up 35.6 174.8 Up 08:22:18 - 08:40:06 3153
Gardnerville 08:31:15 -27.5 Dark Up 35.6 174.1 Up 08:22:21 - 08:40:09 3148
Hawthorne 08:31:11 -27.8 Dark Up 36.1 175.4 Up 08:22:17 - 08:40:05 3125
Tonopah 08:31:06 -28.1 Dark Up 36.6 177.1 Up 08:22:12 - 08:40:00 3099
Lee Vining 08:31:12 -28.4 Dark Up 36.6 174.8 Up 08:22:18 - 08:40:06 3086
Bishop 08:31:10 -28.9 Dark Up 37.2 175.6 Up 08:22:16 - 08:40:04 3048
Beatty 08:31:04 -29.1 Dark Up 37.8 177.6 Up 08:22:10 - 08:39:58 3022
Indian Springs 08:31:01 -29.3 Dark Up 38.1 178.9 Up 08:22:07 - 08:39:55 3003
Lone Pine 08:31:09 -29.6 Dark Up 38.0 176.0 Up 08:22:15 - 08:40:03 2998
Henderson 08:30:57 -29.7 Dark Up 38.7 179.7 Up 08:22:03 - 08:39:51 2968
Searchlight/Boulder City 08:30:58 -30.2 Dark Up 39.2 179.8 Up 08:22:04 - 08:39:52 2928
Patrick 08:30:53 -30.0 Dark Up 39.3 181.1 Up 08:21:59 - 08:39:47 2926
Kingman/Dolan Springs 08:30:54 -30.3 Dark Up 39.5 180.8 Up 08:22:00 - 08:39:48 2910
Laughlin/Bullhead City 08:30:56 -30.4 Dark Up 39.5 180.2 Up 08:22:02 - 08:39:50 2907
DCO 08:30:51 -30.2 Dark Up 39.6 181.9 Up 08:21:57 - 08:39:45 2906
CPSLO 08:31:19 -31.2 Dark Up 39.1 172.7 Up 08:22:25 - 08:40:13 2897
Mohave Valley 08:30:56 -30.7 Dark Up 39.8 180.2 Up 08:22:02 - 08:39:50 2888
Lake Havasu City 08:30:55 -31.0 Dark Up 40.2 180.5 Up 08:22:01 - 08:39:49 2860
Parker 08:30:55 -31.4 Dark Up 40.6 180.5 Up 08:22:01 - 08:39:49 2835
Wildwood 08:31:12 -32.2 Dark Up 40.5 175.2 Up 08:22:18 - 08:40:06 2819
Idyllwild 08:31:04 -32.2 Dark Up 40.9 177.5 Up 08:22:10 - 08:39:58 2799
Blythe 08:30:56 -31.9 Dark Up 41.1 180.2 Up 08:22:02 - 08:39:50 2796
Calipatria 08:31:00 -32.6 Dark Up 41.6 179.0 Up 08:22:06 - 08:39:54 2758
Yuma 08:30:56 -32.8 Dark Up 42.0 180.1 Up 08:22:02 - 08:39:50 2728

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 50000, (2019/06/11 08:31UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 25.86  66
35Eta Oph      17:10:22.7 -15:43:29  2.6 14.28  73
PPM 234113     18:09:43.4 -13:56:04  6.4  1.37  87
PPM 234112     18:09:43.1 -15:16:57  7.7  0.03  87
50000          18:09:38.4 -15:17:58 16.5        87
Positions are for J2000

Event circumstances last updated at 2017/12/06 19:01:20 UT

Marc W. Buie, Southwest Research Institute

RECON