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 08:15:53.6 +18:40:33
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 -- 16.2 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 09:45:41 -55.8 Dark Up 56.2 213.3 Up 09:30:41 - 10:00:41 9511
Tonasket 09:45:41 -56.0 Dark Up 56.4 213.5 Up 09:30:41 - 10:00:41 9491
Okanogan 09:45:39 -56.3 Dark Up 56.7 213.5 Up 09:30:39 - 10:00:39 9459
Brewster 09:45:40 -56.6 Dark Up 57.0 213.4 Up 09:30:40 - 10:00:40 9430
Manson/Chelan 09:45:40 -56.9 Dark Up 57.3 213.0 Up 09:30:40 - 10:00:40 9404
Entiat 09:45:41 -57.1 Dark Up 57.6 213.1 Up 09:30:41 - 10:00:41 9383
Wenatchee 09:45:39 -57.4 Dark Up 57.8 213.1 Up 09:30:39 - 10:00:39 9358
Ellensburg 09:45:40 -57.8 Dark Up 58.2 213.2 Up 09:30:40 - 10:00:40 9316
Pasco 09:45:34 -57.6 Dark Up 58.3 216.1 Up 09:30:34 - 10:00:34 9283
Yakima 09:45:40 -58.1 Dark Up 58.6 213.5 Up 09:30:40 - 10:00:40 9279
PNWRO 09:45:34 -57.6 Dark Up 58.4 216.8 Up 09:30:34 - 10:00:34 9267
Toppenish/White Swan 09:45:38 -58.1 Dark Up 58.7 214.0 Up 09:30:38 - 10:00:38 9264
George/Umatilla 09:45:34 -57.9 Dark Up 58.7 216.1 Up 09:30:34 - 10:00:34 9248
Goldendale 09:45:38 -58.7 Dark Up 59.3 213.8 Up 09:30:38 - 10:00:38 9204
The Dalles 09:45:40 -59.1 Dark Up 59.6 213.3 Up 09:30:40 - 10:00:40 9176
Maupin 09:45:38 -59.3 Dark Up 60.0 213.9 Up 09:30:38 - 10:00:38 9140
Niwot 09:44:44 -52.0 Dark Down 54.6 242.5 Up 09:29:44 - 09:59:44 9111
Madras/Culver 09:45:37 -59.7 Dark Up 60.4 214.4 Up 09:30:37 - 10:00:37 9089
Redmond 09:45:37 -60.0 Dark Up 60.7 214.6 Up 09:30:37 - 10:00:37 9055
Sisters 09:45:38 -60.2 Dark Up 60.9 213.9 Up 09:30:38 - 10:00:38 9048
Bend 09:45:37 -60.2 Dark Up 61.0 214.6 Up 09:30:37 - 10:00:37 9032
Oregon Observatory 09:45:37 -60.4 Dark Up 61.2 214.6 Up 09:30:37 - 10:00:37 9013
La Pine/Gilchrist 09:45:37 -60.6 Dark Up 61.4 214.7 Up 09:30:37 - 10:00:37 8992
North Lake 09:45:34 -60.6 Dark Up 61.5 216.2 Up 09:30:34 - 10:00:34 8967
Paisley 09:45:32 -60.7 Dark Up 61.8 217.4 Up 09:30:32 - 10:00:32 8924
Lakeview 09:45:31 -60.9 Dark Up 62.1 218.3 Up 09:30:31 - 10:00:31 8882
Chiloquin 09:45:36 -61.5 Dark Up 62.4 215.2 Up 09:30:36 - 10:00:36 8880
Klamath Falls 09:45:35 -61.7 Dark Up 62.7 215.7 Up 09:30:35 - 10:00:35 8850
Tulelake 09:45:34 -61.7 Dark Up 62.8 216.6 Up 09:30:34 - 10:00:34 8832
Cedarville 09:45:28 -61.3 Dark Up 62.5 219.4 Up 09:30:28 - 10:00:28 8825
Fall River/Burney 09:45:31 -62.3 Dark Up 63.5 217.8 Up 09:30:31 - 10:00:31 8748
Susanville 09:45:29 -62.2 Dark Up 63.6 219.9 Up 09:30:29 - 10:00:29 8707
Gimple 09:45:29 -62.5 Dark Up 63.9 219.9 Up 09:30:29 - 10:00:29 8676
Greenville 09:45:29 -62.6 Dark Up 64.0 219.8 Up 09:30:29 - 10:00:29 8674
Portola 09:45:27 -62.5 Dark Up 64.0 221.1 Up 09:30:27 - 10:00:27 8655
Quincy 09:45:29 -62.7 Dark Up 64.1 220.0 Up 09:30:29 - 10:00:29 8654
Reno 09:45:25 -62.2 Dark Up 63.8 222.6 Up 09:30:25 - 10:00:25 8646
Carson City 09:45:25 -62.4 Dark Up 64.1 223.1 Up 09:30:25 - 10:00:25 8612
Yerington 09:45:22 -62.1 Dark Up 63.9 224.5 Up 09:30:22 - 10:00:22 8611
Gardnerville 09:45:23 -62.5 Dark Up 64.2 223.5 Up 09:30:23 - 10:00:23 8590
Hawthorne 09:45:20 -62.0 Dark Up 63.9 226.1 Up 09:30:20 - 10:00:20 8580
Tonopah 09:45:14 -61.3 Dark Up 63.4 229.1 Up 09:30:14 - 10:00:14 8574
Lee Vining 09:45:20 -62.7 Dark Up 64.6 226.1 Up 09:30:20 - 10:00:20 8513
Beatty 09:45:11 -61.6 Dark Up 63.9 231.7 Up 09:30:11 - 10:00:11 8476
Bishop 09:45:16 -62.5 Dark Up 64.6 228.3 Up 09:30:16 - 10:00:16 8475
Indian Springs 09:45:07 -60.9 Dark Up 63.4 233.9 Up 09:30:07 - 10:00:07 8475
Henderson 09:45:03 -60.7 Dark Up 63.3 235.8 Up 09:30:03 - 10:00:03 8444
Patrick 09:44:59 -60.1 Dark Up 62.9 238.4 Up 09:29:59 - 09:59:59 8416
Lone Pine 09:45:15 -62.6 Dark Up 64.9 230.0 Up 09:30:15 - 10:00:15 8411
DCO 09:44:57 -59.6 Dark Up 62.5 239.9 Up 09:29:57 - 09:59:57 8408
Searchlight/Boulder City 09:45:02 -60.8 Dark Up 63.6 236.8 Up 09:30:02 - 10:00:02 8390
Kingman/Dolan Springs 09:44:59 -60.3 Dark Up 63.1 238.5 Up 09:29:59 - 09:59:59 8389
Laughlin/Bullhead City 09:45:01 -60.7 Dark Up 63.5 237.8 Up 09:30:01 - 10:00:01 8371
Mohave Valley 09:45:00 -60.8 Dark Up 63.6 238.3 Up 09:30:00 - 10:00:00 8345
Lake Havasu City 09:44:59 -60.7 Dark Up 63.7 239.3 Up 09:29:59 - 09:59:59 8314
Parker 09:44:59 -60.8 Dark Up 63.8 240.0 Up 09:29:59 - 09:59:59 8280
Blythe 09:44:59 -61.2 Dark Up 64.3 240.5 Up 09:29:59 - 09:59:59 8220
CPSLO 09:45:20 -65.1 Dark Up 67.3 227.6 Up 09:30:20 - 10:00:20 8212
Idyllwild 09:45:05 -62.8 Dark Up 65.7 237.2 Up 09:30:05 - 10:00:05 8169
Wildwood 09:45:12 -64.1 Dark Up 66.8 233.5 Up 09:30:12 - 10:00:12 8150
Calipatria 09:45:01 -62.1 Dark Up 65.2 240.1 Up 09:30:01 - 10:00:01 8144
Yuma 09:44:57 -61.5 Dark Up 64.8 242.1 Up 09:29:57 - 09:59:57 8128

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 2017/12/05 19:11:09 UT

Marc W. Buie, Southwest Research Institute

RECON