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 08:31:27 UTC

J2000 position of star is 18:09:38.4 -15:17:58
Equinox of date position of star is 18:10:38.9 -15:17:43
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 99 seconds.
The 1-sigma cross-track error in the shadow position is 1527 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=8.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 08:31:45 -17.6 AT Up 25.6 175.2 Low 08:23:02 - 08:40:29 3259
Tonasket 08:31:45 -17.8 AT Up 25.9 175.2 Low 08:23:02 - 08:40:29 3248
Okanogan 08:31:46 -18.2 Dark Up 26.2 175.0 Low 08:23:02 - 08:40:29 3231
Brewster 08:31:47 -18.4 Dark Up 26.5 174.8 Low 08:23:03 - 08:40:30 3217
Manson/Chelan 08:31:48 -18.7 Dark Up 26.6 174.4 Low 08:23:04 - 08:40:31 3205
Entiat 08:31:48 -18.9 Dark Up 26.9 174.3 Low 08:23:04 - 08:40:31 3194
Wenatchee 08:31:48 -19.2 Dark Up 27.1 174.2 Low 08:23:05 - 08:40:32 3180
Ellensburg 08:31:49 -19.6 Dark Up 27.5 173.9 Low 08:23:05 - 08:40:32 3158
Yakima 08:31:49 -20.0 Dark Up 27.9 173.9 Low 08:23:06 - 08:40:33 3137
Toppenish/White Swan 08:31:49 -20.2 Dark Up 28.1 174.0 Low 08:23:05 - 08:40:32 3126
Pasco 08:31:45 -20.2 Dark Up 28.3 175.4 Low 08:23:01 - 08:40:28 3124
PNWRO 08:31:44 -20.4 Dark Up 28.6 175.6 Low 08:23:01 - 08:40:28 3112
George/Umatilla 08:31:46 -20.6 Dark Up 28.7 175.1 Low 08:23:02 - 08:40:29 3105
Goldendale 08:31:51 -20.8 Dark Up 28.6 173.5 Low 08:23:07 - 08:40:34 3095
The Dalles 08:31:51 -21.0 Dark Up 28.8 173.1 Low 08:23:08 - 08:40:35 3081
Maupin 08:31:51 -21.5 Dark Up 29.3 173.2 Low 08:23:08 - 08:40:35 3059
Madras/Culver 08:31:52 -22.0 Dark Up 29.8 173.1 Low 08:23:08 - 08:40:35 3029
Redmond 08:31:52 -22.4 Dark Up 30.2 173.1 Up 08:23:08 - 08:40:35 3009
Sisters 08:31:53 -22.4 Dark Up 30.1 172.6 Up 08:23:10 - 08:40:37 3008
Bend 08:31:52 -22.6 Dark Up 30.4 172.9 Up 08:23:09 - 08:40:36 2996
Oregon Observatory 08:31:53 -22.8 Dark Up 30.5 172.7 Up 08:23:10 - 08:40:37 2986
La Pine/Gilchrist 08:31:53 -23.0 Dark Up 30.7 172.7 Up 08:23:10 - 08:40:37 2974
North Lake 08:31:51 -23.4 Dark Up 31.2 173.3 Up 08:23:08 - 08:40:35 2951
Paisley 08:31:50 -23.9 Dark Up 31.8 173.7 Up 08:23:07 - 08:40:34 2920
Chiloquin 08:31:55 -24.1 Dark Up 31.8 172.2 Up 08:23:12 - 08:40:39 2907
Lakeview 08:31:50 -24.4 Dark Up 32.3 173.8 Up 08:23:06 - 08:40:33 2891
Klamath Falls 08:31:55 -24.4 Dark Up 32.1 172.2 Up 08:23:11 - 08:40:38 2887
Tulelake 08:31:54 -24.7 Dark Up 32.4 172.6 Up 08:23:10 - 08:40:37 2872
Cedarville 08:31:49 -25.0 Dark Up 33.0 174.0 Up 08:23:06 - 08:40:33 2852
Fall River/Burney 08:31:54 -25.6 Dark Up 33.3 172.6 Up 08:23:10 - 08:40:37 2817
Susanville 08:31:51 -26.1 Dark Up 34.0 173.4 Up 08:23:08 - 08:40:35 2781
Niwot 08:30:57 -23.4 Dark Down 33.9 191.1 Up 08:22:14 - 08:39:41 2780
Gimple 08:31:52 -26.4 Dark Up 34.3 173.1 Up 08:23:08 - 08:40:35 2762
Greenville 08:31:52 -26.4 Dark Up 34.3 173.0 Up 08:23:09 - 08:40:36 2762
Quincy 08:31:52 -26.6 Dark Up 34.5 173.0 Up 08:23:09 - 08:40:36 2749
Portola 08:31:51 -26.7 Dark Up 34.7 173.5 Up 08:23:07 - 08:40:34 2743
Reno 08:31:48 -26.9 Dark Up 35.0 174.3 Up 08:23:05 - 08:40:32 2729
Carson City 08:31:48 -27.3 Dark Up 35.3 174.3 Up 08:23:05 - 08:40:32 2706
Yerington 08:31:46 -27.4 Dark Up 35.6 175.0 Up 08:23:03 - 08:40:30 2695
Gardnerville 08:31:48 -27.5 Dark Up 35.6 174.3 Up 08:23:05 - 08:40:32 2690
Hawthorne 08:31:44 -27.8 Dark Up 36.1 175.6 Up 08:23:01 - 08:40:28 2667
Tonopah 08:31:39 -28.0 Dark Up 36.6 177.2 Up 08:22:56 - 08:40:23 2641
Lee Vining 08:31:46 -28.4 Dark Up 36.6 175.0 Up 08:23:03 - 08:40:30 2628
Bishop 08:31:44 -28.9 Dark Up 37.2 175.8 Up 08:23:00 - 08:40:27 2590
Beatty 08:31:38 -29.1 Dark Up 37.8 177.7 Up 08:22:54 - 08:40:21 2564
Indian Springs 08:31:33 -29.2 Dark Up 38.1 179.0 Up 08:22:50 - 08:40:17 2544
Lone Pine 08:31:43 -29.6 Dark Up 38.0 176.2 Up 08:22:59 - 08:40:26 2539
Henderson 08:31:31 -29.6 Dark Up 38.7 179.9 Up 08:22:47 - 08:40:14 2508
Searchlight/Boulder City 08:31:31 -30.2 Dark Up 39.2 179.9 Up 08:22:47 - 08:40:14 2469
Patrick 08:31:28 -30.0 Dark Up 39.3 181.2 Up 08:22:44 - 08:40:11 2467
Kingman/Dolan Springs 08:31:28 -30.3 Dark Up 39.5 181.0 Up 08:22:45 - 08:40:12 2451
Laughlin/Bullhead City 08:31:30 -30.4 Dark Up 39.5 180.4 Up 08:22:46 - 08:40:13 2448
DCO 08:31:25 -30.2 Dark Up 39.6 182.1 Up 08:22:42 - 08:40:09 2447
CPSLO 08:31:52 -31.2 Dark Up 39.1 172.9 Up 08:23:09 - 08:40:36 2438
Mohave Valley 08:31:30 -30.7 Dark Up 39.8 180.4 Up 08:22:46 - 08:40:13 2429
Lake Havasu City 08:31:29 -31.0 Dark Up 40.2 180.7 Up 08:22:45 - 08:40:12 2401
Parker 08:31:29 -31.3 Dark Up 40.6 180.7 Up 08:22:45 - 08:40:12 2375
Wildwood 08:31:45 -32.1 Dark Up 40.5 175.3 Up 08:23:01 - 08:40:28 2360
Idyllwild 08:31:37 -32.2 Dark Up 40.9 177.7 Up 08:22:54 - 08:40:21 2341
Blythe 08:31:30 -31.9 Dark Up 41.1 180.4 Up 08:22:46 - 08:40:13 2337
Calipatria 08:31:33 -32.6 Dark Up 41.6 179.2 Up 08:22:50 - 08:40:17 2298
Yuma 08:31:30 -32.8 Dark Up 42.0 180.3 Up 08:22:46 - 08:40:13 2268

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 2017/08/04 18:07:37 UT

Marc W. Buie, Southwest Research Institute

RECON