RECON: TNO occultation with 12KU50

Event between 12KU50 and star UC4-389-062829 with event index number of 187355

Geocentric closest approach at 2019/05/03 10:46:16 UTC

J2000 position of star is 15:17:34.0 -12:12:20
Equinox of date position of star is 15:18:37.0 -12:16:29
Stellar brightness R=13.6, use SENSEUP=64
Star is 155 degrees from the moon. Moon is 3% illuminated.
TNO apparent brightness V=21.4

[RECON map]
TNO is 32.0 AU from the Sun and 31.1 AU from the Earth.
The TNO is moving 23.8 km/sec on the sky relative to the star, or, 3.8 arcsec/hr.
The 1-sigma error in the time of the event is 68 seconds.
The 1-sigma cross-track error in the shadow position is 1372 km.
The sky-plane scale is 22523.4 km/arcsec.

The TNO has an absolute magnitude Hv=6.4
Diameter=313.3 km assuming a 5% albedo -- 13.2 sec chord
Diameter=127.9 km assuming a 30% albedo -- 5.4 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 12KU50, (2019/05/03 10:46UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:35.8 -26:28:24  0.9 22.08 134
27Bet Lib      15:18:03.0 -09:27:11  2.6  2.83 156
31Eps Lib      15:25:14.9 -10:23:26  4.8  2.49 154
PPM 230042     15:19:28.7 -12:59:40  8.5  0.75 154
PPM 230039     15:19:22.2 -12:30:34  9.6  0.30 155
12KU50         15:18:37.7 -12:16:32 13.6       155
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=0.9 and success probability=0.3%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 10:45:30 -14.4 AT Down 21.2 215.5 Low 10:39:21 - 10:51:40 6952
Summerland 10:45:31 -14.6 AT Down 21.4 215.2 Low 10:39:21 - 10:51:40 6949
Penticton 10:45:29 -14.8 AT Down 21.6 215.4 Low 10:39:20 - 10:51:39 6935
Okanagan Falls 10:45:29 -14.9 AT Down 21.8 215.5 Low 10:39:20 - 10:51:39 6927
Oliver 10:45:29 -15.0 AT Down 21.9 215.5 Low 10:39:19 - 10:51:38 6919
Anarchist Mountain Observatory 10:45:28 -15.1 AT Down 22.0 215.7 Low 10:39:18 - 10:51:37 6912
Oroville 10:45:28 -15.2 AT Down 22.1 215.7 Low 10:39:19 - 10:51:38 6909
Tonasket 10:45:27 -15.3 AT Down 22.2 215.7 Low 10:39:18 - 10:51:37 6898
Okanogan 10:45:28 -15.6 AT Down 22.6 215.7 Low 10:39:18 - 10:51:37 6882
Brewster 10:45:27 -15.9 AT Down 22.9 215.5 Low 10:39:17 - 10:51:36 6868
Manson/Chelan 10:45:27 -16.3 AT Down 23.2 215.2 Low 10:39:18 - 10:51:37 6856
Entiat 10:45:27 -16.4 AT Down 23.4 215.2 Low 10:39:17 - 10:51:36 6845
Wenatchee 10:45:27 -16.7 AT Down 23.6 215.2 Low 10:39:17 - 10:51:36 6833
Ellensburg 10:45:26 -17.1 AT Down 24.1 215.1 Low 10:39:16 - 10:51:35 6811
Yakima 10:45:25 -17.4 AT Down 24.4 215.2 Low 10:39:16 - 10:51:35 6791
Toppenish/White Swan 10:45:25 -17.5 AT Down 24.5 215.4 Low 10:39:15 - 10:51:34 6781
Pasco 10:45:21 -17.0 AT Down 24.1 216.6 Low 10:39:11 - 10:51:30 6780
PNWRO 10:45:19 -17.1 AT Down 24.2 216.9 Low 10:39:09 - 10:51:28 6769
George/Umatilla 10:45:21 -17.3 AT Down 24.5 216.5 Low 10:39:11 - 10:51:30 6762
Goldendale 10:45:24 -18.1 Dark Down 25.1 215.1 Low 10:39:14 - 10:51:33 6751
The Dalles 10:45:25 -18.4 Dark Down 25.5 214.8 Low 10:39:16 - 10:51:35 6737
Maupin 10:45:23 -18.7 Dark Down 25.8 215.0 Low 10:39:14 - 10:51:33 6716
Madras/Culver 10:45:22 -19.1 Dark Down 26.2 215.1 Low 10:39:13 - 10:51:32 6687
Redmond 10:45:22 -19.4 Dark Down 26.6 215.2 Low 10:39:12 - 10:51:31 6667
Sisters 10:45:23 -19.6 Dark Down 26.7 214.8 Low 10:39:13 - 10:51:32 6666
Bend 10:45:22 -19.6 Dark Down 26.8 215.1 Low 10:39:13 - 10:51:32 6655
Oregon Observatory 10:45:21 -19.8 Dark Down 27.0 215.0 Low 10:39:12 - 10:51:31 6645
La Pine/Gilchrist 10:45:22 -20.0 Dark Down 27.2 215.0 Low 10:39:12 - 10:51:31 6633
North Lake 10:45:19 -20.1 Dark Down 27.3 215.7 Low 10:39:09 - 10:51:28 6612
Paisley 10:45:16 -20.3 Dark Down 27.6 216.3 Low 10:39:07 - 10:51:26 6583
Chiloquin 10:45:20 -21.0 Dark Down 28.2 215.0 Low 10:39:10 - 10:51:29 6569
Lakeview 10:45:15 -20.6 Dark Down 27.9 216.6 Low 10:39:05 - 10:51:24 6555
Klamath Falls 10:45:19 -21.2 Dark Down 28.5 215.2 Low 10:39:09 - 10:51:28 6550
Tulelake 10:45:18 -21.3 Dark Down 28.6 215.6 Low 10:39:08 - 10:51:27 6536
Cedarville 10:45:13 -21.0 Dark Down 28.4 217.0 Low 10:39:04 - 10:51:23 6518
Fall River/Burney 10:45:16 -21.9 Dark Down 29.3 215.9 Low 10:39:06 - 10:51:25 6483
Niwot 10:44:29 -13.3 AT Down 21.6 230.9 Low 10:38:19 - 10:50:38 6461
SwRI 10:44:29 -13.4 AT Down 21.7 230.9 Low 10:38:20 - 10:50:39 6455
Susanville 10:45:12 -22.0 Dark Down 29.5 216.9 Low 10:39:03 - 10:51:22 6449
Gimple 10:45:12 -22.3 Dark Down 29.8 216.7 Low 10:39:02 - 10:51:21 6431
Greenville 10:45:12 -22.4 Dark Down 29.8 216.7 Low 10:39:03 - 10:51:22 6431
Quincy 10:45:13 -22.5 Dark Down 30.0 216.7 Low 10:39:03 - 10:51:22 6418
Portola 10:45:10 -22.4 Dark Down 29.9 217.2 Low 10:39:00 - 10:51:19 6413
Reno 10:45:08 -22.2 Dark Down 29.8 218.0 Low 10:38:58 - 10:51:17 6400
Carson City 10:45:07 -22.5 Dark Down 30.0 218.1 Up 10:38:57 - 10:51:16 6378
Yerington 10:45:04 -22.2 Dark Down 29.9 218.8 Low 10:38:54 - 10:51:13 6369
Gardnerville 10:45:06 -22.6 Dark Down 30.2 218.3 Up 10:38:57 - 10:51:16 6363
Hawthorne 10:45:02 -22.3 Dark Down 30.0 219.5 Up 10:38:52 - 10:51:11 6342
Tonopah 10:44:56 -21.8 Dark Down 29.7 221.0 Low 10:38:46 - 10:51:05 6318
Lee Vining 10:45:03 -23.0 Dark Down 30.7 219.2 Up 10:38:53 - 10:51:12 6304
Bishop 10:44:59 -23.0 Dark Down 30.8 220.1 Up 10:38:49 - 10:51:08 6268
Beatty 10:44:52 -22.3 Dark Down 30.3 221.9 Up 10:38:43 - 10:51:02 6245
Indian Springs 10:44:49 -21.9 Dark Down 30.0 223.0 Low 10:38:39 - 10:50:58 6227
Lone Pine 10:44:56 -23.3 Dark Down 31.2 220.7 Up 10:38:46 - 10:51:05 6220
Henderson 10:44:46 -21.9 Dark Down 30.0 223.8 Low 10:38:37 - 10:50:56 6194
Searchlight/Boulder City 10:44:44 -22.2 Dark Down 30.4 224.1 Up 10:38:34 - 10:50:53 6155
Patrick 10:44:41 -21.6 Dark Down 29.8 225.1 Low 10:38:31 - 10:50:50 6155
Kingman/Dolan Springs 10:44:40 -21.9 Dark Down 30.1 225.0 Up 10:38:31 - 10:50:50 6139
Laughlin/Bullhead City 10:44:42 -22.2 Dark Down 30.4 224.5 Up 10:38:33 - 10:50:52 6136
DCO 10:44:38 -21.3 Dark Down 29.6 225.8 Low 10:38:28 - 10:50:47 6136
CPSLO 10:45:01 -25.7 Dark Down 33.5 218.7 Up 10:38:51 - 10:51:10 6119
Mohave Valley 10:44:41 -22.4 Dark Down 30.6 224.7 Up 10:38:31 - 10:50:50 6117
Lake Havasu City 10:44:40 -22.5 Dark Down 30.7 225.1 Up 10:38:31 - 10:50:50 6091
Parker 10:44:39 -22.7 Dark Down 30.9 225.2 Up 10:38:29 - 10:50:48 6066
Wildwood 10:44:53 -25.4 Dark Down 33.4 221.2 Up 10:38:43 - 10:51:02 6046
Idyllwild 10:44:45 -24.5 Dark Down 32.6 223.2 Up 10:38:36 - 10:50:55 6029
Blythe 10:44:38 -23.2 Dark Down 31.5 225.2 Up 10:38:29 - 10:50:48 6028
Calipatria 10:44:40 -24.1 Dark Down 32.4 224.5 Up 10:38:31 - 10:50:50 5990
Yuma 10:44:36 -23.8 Dark Down 32.2 225.5 Up 10:38:27 - 10:50:46 5962

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 12KU50, (2019/05/03 10:46UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 22.08 134
27Bet Lib      15:17:00.3 -09:22:59  2.6  2.83 156
31Eps Lib      15:24:11.8 -10:19:23  4.8  2.49 154
PPM 230042     15:18:24.7 -12:55:29  8.5  0.75 154
PPM 230039     15:18:18.4 -12:26:23  9.6  0.30 155
12KU50         15:17:34.0 -12:12:20 13.6       155
Positions are for J2000

Event circumstances last updated at 2019/02/12 07:34:14 UT

Marc W. Buie, Southwest Research Institute

RECON