RECON: TNO occultation with 01XR254

Event between 01XR254 and star UC4-544-045373 with event index number of 174291

Geocentric closest approach at 2019/01/16 09:46:04 UTC

J2000 position of star is 08:14:51.7 +18:43:53
Equinox of date position of star is 08:15:50.7 +18:40:42
Stellar brightness R=15.3, use SENSEUP=128
Star is 70 degrees from the moon. Moon is 71% illuminated.
TNO apparent brightness V=22.2

[RECON map]
TNO is 43.9 AU from the Sun and 42.9 AU from the Earth.
The TNO is moving 25.7 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 469 seconds.
The 1-sigma cross-track error in the shadow position is 2215 km.
The sky-plane scale is 31147.9 km/arcsec.

The TNO has an absolute magnitude Hv=5.8
Diameter=416.9 km assuming a 5% albedo -- 16.3 sec chord
Diameter=170.2 km assuming a 30% albedo -- 6.6 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 01XR254, (2019/01/16 09:46UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:28.8 +27:58:43  1.1 11.50  63
16Zet2Cnc      08:13:18.3 +17:35:22  5.2  1.25  70
PPM 125077     08:18:02.0 +17:52:26  8.5  0.94  71
PPM 124991     08:13:37.5 +18:27:30  9.4  0.59  70
PPM 125056     08:17:08.6 +18:38:18 10.4  0.28  71
01XR254        08:15:57.4 +18:40:21 15.3        71
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 1.9 sigma about the mid-time.
The median site spacing is 20.4 km RECON observability=1.0 and success probability=0.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 09:45:40 -55.8 Dark Up 56.2 213.3 Up 09:30:40 - 10:00:40 9518
Tonasket 09:45:40 -56.0 Dark Up 56.4 213.5 Up 09:30:40 - 10:00:40 9498
Okanogan 09:45:39 -56.3 Dark Up 56.7 213.5 Up 09:30:39 - 10:00:39 9465
Brewster 09:45:39 -56.6 Dark Up 57.0 213.4 Up 09:30:39 - 10:00:39 9437
Manson/Chelan 09:45:39 -56.9 Dark Up 57.3 213.0 Up 09:30:39 - 10:00:39 9410
Entiat 09:45:39 -57.1 Dark Up 57.6 213.1 Up 09:30:39 - 10:00:39 9389
Wenatchee 09:45:41 -57.4 Dark Up 57.8 213.2 Up 09:30:41 - 10:00:41 9365
Ellensburg 09:45:40 -57.8 Dark Up 58.2 213.2 Up 09:30:40 - 10:00:40 9323
Pasco 09:45:34 -57.6 Dark Up 58.3 216.1 Up 09:30:34 - 10:00:34 9290
Yakima 09:45:38 -58.1 Dark Up 58.6 213.5 Up 09:30:38 - 10:00:38 9286
PNWRO 09:45:33 -57.6 Dark Up 58.4 216.7 Up 09:30:33 - 10:00:33 9274
Toppenish/White Swan 09:45:38 -58.1 Dark Up 58.7 214.0 Up 09:30:38 - 10:00:38 9271
George/Umatilla 09:45:34 -57.9 Dark Up 58.7 216.1 Up 09:30:34 - 10:00:34 9255
Goldendale 09:45:37 -58.7 Dark Up 59.3 213.7 Up 09:30:37 - 10:00:37 9211
The Dalles 09:45:39 -59.1 Dark Up 59.6 213.3 Up 09:30:39 - 10:00:39 9182
Maupin 09:45:37 -59.3 Dark Up 60.0 213.9 Up 09:30:37 - 10:00:37 9147
Niwot 09:44:45 -52.0 Dark Down 54.6 242.5 Up 09:29:45 - 09:59:45 9121
Madras/Culver 09:45:37 -59.7 Dark Up 60.4 214.4 Up 09:30:37 - 10:00:37 9096
Redmond 09:45:36 -60.0 Dark Up 60.7 214.6 Up 09:30:36 - 10:00:36 9062
Sisters 09:45:37 -60.2 Dark Up 60.9 213.9 Up 09:30:37 - 10:00:37 9055
Bend 09:45:36 -60.2 Dark Up 61.0 214.6 Up 09:30:36 - 10:00:36 9039
Oregon Observatory 09:45:36 -60.4 Dark Up 61.2 214.6 Up 09:30:36 - 10:00:36 9020
La Pine/Gilchrist 09:45:36 -60.6 Dark Up 61.4 214.7 Up 09:30:36 - 10:00:36 9000
North Lake 09:45:34 -60.6 Dark Up 61.5 216.2 Up 09:30:34 - 10:00:34 8974
Paisley 09:45:32 -60.7 Dark Up 61.8 217.4 Up 09:30:32 - 10:00:32 8932
Lakeview 09:45:30 -60.9 Dark Up 62.1 218.3 Up 09:30:30 - 10:00:30 8890
Chiloquin 09:45:35 -61.5 Dark Up 62.4 215.2 Up 09:30:35 - 10:00:35 8888
Klamath Falls 09:45:34 -61.7 Dark Up 62.7 215.7 Up 09:30:34 - 10:00:34 8858
Tulelake 09:45:33 -61.7 Dark Up 62.8 216.6 Up 09:30:33 - 10:00:33 8840
Cedarville 09:45:28 -61.3 Dark Up 62.5 219.4 Up 09:30:28 - 10:00:28 8833
Fall River/Burney 09:45:31 -62.3 Dark Up 63.5 217.8 Up 09:30:31 - 10:00:31 8756
Susanville 09:45:28 -62.2 Dark Up 63.6 219.9 Up 09:30:28 - 10:00:28 8715
Gimple 09:45:28 -62.5 Dark Up 63.9 219.9 Up 09:30:28 - 10:00:28 8683
Greenville 09:45:28 -62.6 Dark Up 64.0 219.8 Up 09:30:28 - 10:00:28 8681
Portola 09:45:26 -62.5 Dark Up 64.0 221.1 Up 09:30:26 - 10:00:26 8663
Quincy 09:45:28 -62.7 Dark Up 64.1 220.0 Up 09:30:28 - 10:00:28 8662
Reno 09:45:24 -62.2 Dark Up 63.8 222.6 Up 09:30:24 - 10:00:24 8654
Carson City 09:45:23 -62.4 Dark Up 64.1 223.1 Up 09:30:23 - 10:00:23 8621
Yerington 09:45:21 -62.1 Dark Up 63.9 224.5 Up 09:30:21 - 10:00:21 8619
Gardnerville 09:45:23 -62.5 Dark Up 64.2 223.5 Up 09:30:23 - 10:00:23 8598
Hawthorne 09:45:19 -62.0 Dark Up 63.9 226.1 Up 09:30:19 - 10:00:19 8589
Tonopah 09:45:12 -61.3 Dark Up 63.4 229.1 Up 09:30:12 - 10:00:12 8583
Lee Vining 09:45:19 -62.7 Dark Up 64.6 226.1 Up 09:30:19 - 10:00:19 8521
Beatty 09:45:09 -61.6 Dark Up 63.9 231.7 Up 09:30:09 - 10:00:09 8484
Indian Springs 09:45:06 -60.9 Dark Up 63.4 233.9 Up 09:30:06 - 10:00:06 8484
Bishop 09:45:16 -62.5 Dark Up 64.6 228.2 Up 09:30:16 - 10:00:16 8483
Henderson 09:45:03 -60.7 Dark Up 63.3 235.8 Up 09:30:03 - 10:00:03 8452
Patrick 09:44:59 -60.1 Dark Up 62.9 238.4 Up 09:29:59 - 09:59:59 8425
Lone Pine 09:45:12 -62.6 Dark Up 64.9 230.0 Up 09:30:12 - 10:00:12 8419
DCO 09:44:56 -59.6 Dark Up 62.5 239.9 Up 09:29:56 - 09:59:56 8417
Searchlight/Boulder City 09:45:03 -60.8 Dark Up 63.6 236.8 Up 09:30:03 - 10:00:03 8399
Kingman/Dolan Springs 09:44:59 -60.3 Dark Up 63.1 238.5 Up 09:29:59 - 09:59:59 8398
Laughlin/Bullhead City 09:45:01 -60.7 Dark Up 63.5 237.8 Up 09:30:01 - 10:00:01 8380
Mohave Valley 09:45:00 -60.8 Dark Up 63.6 238.3 Up 09:30:00 - 10:00:00 8354
Lake Havasu City 09:44:59 -60.7 Dark Up 63.7 239.3 Up 09:29:59 - 09:59:59 8322
Parker 09:44:58 -60.8 Dark Up 63.8 240.0 Up 09:29:58 - 09:59:58 8289
Blythe 09:44:57 -61.2 Dark Up 64.3 240.5 Up 09:29:57 - 09:59:57 8229
CPSLO 09:45:19 -65.1 Dark Up 67.3 227.6 Up 09:30:19 - 10:00:19 8220
Idyllwild 09:45:05 -62.8 Dark Up 65.7 237.2 Up 09:30:05 - 10:00:05 8178
Wildwood 09:45:11 -64.1 Dark Up 66.8 233.5 Up 09:30:11 - 10:00:11 8158
Calipatria 09:44:59 -62.1 Dark Up 65.2 240.1 Up 09:29:59 - 09:59:59 8152
Yuma 09:44:56 -61.5 Dark Up 64.8 242.1 Up 09:29:56 - 09:59:56 8137

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 01XR254, (2019/01/16 09:46UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:18.1 +28:01:33  1.1 11.50  63
16Zet2Cnc      08:12:12.9 +17:38:51  5.2  1.25  70
PPM 125077     08:16:56.7 +17:56:01  8.5  0.94  71
PPM 124991     08:12:31.8 +18:30:59  9.4  0.59  70
PPM 125056     08:16:02.9 +18:41:52 10.4  0.28  71
01XR254        08:14:51.7 +18:43:53 15.3        70
Positions are for J2000

Event circumstances last updated at 2017/02/01 18:24:49 UT

Marc W. Buie, Southwest Research Institute

RECON