RECON: TNO occultation with 69990

Event between (69990) 98WU31 and star UC4-550-019478 with event index number of 178060

Geocentric closest approach at 2019/01/30 06:48:01 UTC

J2000 position of star is 05:48:21.3 +19:55:24
Equinox of date position of star is 05:49:23.9 +19:55:41
Stellar brightness R=16.5, use SENSEUP=128
Star is 161 degrees from the moon. Moon is 26% illuminated.
TNO apparent brightness V=23.9

[RECON map]
TNO is 35.6 AU from the Sun and 34.8 AU from the Earth.
The TNO is moving 17.3 km/sec on the sky relative to the star, or, 2.5 arcsec/hr.
The 1-sigma error in the time of the event is 2705 seconds.
The 1-sigma cross-track error in the shadow position is 5468 km.
The sky-plane scale is 25263.8 km/arcsec.

The TNO has an absolute magnitude Hv=8.3
Diameter=131.8 km assuming a 5% albedo -- 7.6 sec chord
Diameter=53.8 km assuming a 30% albedo -- 3.1 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 69990, (2019/01/30 06:48UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:12.3 +07:24:33  0.4 12.62 157
Alnath         05:27:30.0 +28:37:19  1.6 10.03 163
PPM 121513     05:53:31.3 +19:52:16  6.4  0.95 160
PPM 121502     05:52:59.8 +19:31:29  7.1  0.92 160
PPM 121423     05:49:58.3 +19:55:49  8.8  0.11 161
69990          05:49:29.2 +19:55:43 16.5       161
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 0.3 sigma about the mid-time.
The median site spacing is 23.3 km RECON observability=1.0 and success probability=8.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 06:46:25 -54.4 Dark Down 55.1 222.5 Up 06:31:25 - 07:01:25 1253
Tonasket 06:46:25 -54.6 Dark Down 55.2 222.7 Up 06:31:25 - 07:01:25 1231
Okanogan 06:46:25 -54.8 Dark Down 55.6 222.8 Up 06:31:25 - 07:01:25 1198
Brewster 06:46:25 -54.9 Dark Down 55.8 222.8 Up 06:31:25 - 07:01:25 1169
Manson/Chelan 06:46:26 -55.0 Dark Down 56.2 222.5 Up 06:31:26 - 07:01:26 1145
Entiat 06:46:26 -55.1 Dark Down 56.4 222.6 Up 06:31:26 - 07:01:26 1124
Wenatchee 06:46:26 -55.3 Dark Down 56.6 222.7 Up 06:31:26 - 07:01:26 1098
Ellensburg 06:46:26 -55.5 Dark Down 57.0 222.8 Up 06:31:26 - 07:01:26 1056
Yakima 06:46:25 -55.8 Dark Down 57.3 223.2 Up 06:31:25 - 07:01:25 1017
Pasco 06:46:19 -56.7 Dark Down 56.9 225.7 Up 06:31:19 - 07:01:19 1001
Toppenish/White Swan 06:46:24 -56.0 Dark Down 57.4 223.7 Up 06:31:24 - 07:01:24 998
PNWRO 06:46:17 -57.0 Dark Down 56.9 226.3 Up 06:31:17 - 07:01:17 980
George/Umatilla 06:46:19 -56.8 Dark Down 57.2 225.7 Up 06:31:19 - 07:01:19 966
Goldendale 06:46:25 -56.3 Dark Down 58.0 223.7 Up 06:31:25 - 07:01:25 939
The Dalles 06:46:26 -56.3 Dark Down 58.3 223.4 Up 06:31:26 - 07:01:26 913
Maupin 06:46:24 -56.6 Dark Down 58.6 224.0 Up 06:31:24 - 07:01:24 873
Madras/Culver 06:46:23 -57.0 Dark Down 59.0 224.5 Up 06:31:23 - 07:01:23 819
Redmond 06:46:23 -57.2 Dark Down 59.3 224.9 Up 06:31:23 - 07:01:23 784
Sisters 06:46:25 -57.0 Dark Down 59.4 224.2 Up 06:31:25 - 07:01:25 781
Bend 06:46:23 -57.3 Dark Down 59.5 224.9 Up 06:31:23 - 07:01:23 761
Oregon Observatory 06:46:23 -57.4 Dark Down 59.7 224.9 Up 06:31:23 - 07:01:23 742
La Pine/Gilchrist 06:46:23 -57.5 Dark Down 59.9 225.1 Up 06:31:23 - 07:01:23 721
North Lake 06:46:20 -58.1 Dark Down 59.9 226.5 Up 06:31:20 - 07:01:20 685
Paisley 06:46:18 -58.7 Dark Down 60.0 227.8 Up 06:31:18 - 07:01:18 635
Niwot 06:45:10 -66.8 Dark Down 51.6 249.7 Up 06:30:10 - 07:00:10 624
Chiloquin 06:46:23 -58.1 Dark Down 60.8 225.9 Up 06:31:23 - 07:01:23 606
Lakeview 06:46:16 -59.1 Dark Down 60.3 228.7 Up 06:31:16 - 07:01:16 587
Klamath Falls 06:46:22 -58.4 Dark Down 61.0 226.5 Up 06:31:22 - 07:01:22 573
Tulelake 06:46:20 -58.7 Dark Down 61.0 227.3 Up 06:31:20 - 07:01:20 549
Cedarville 06:46:14 -59.7 Dark Down 60.6 229.9 Up 06:31:14 - 07:01:14 523
Fall River/Burney 06:46:19 -59.4 Dark Down 61.6 228.6 Up 06:31:19 - 07:01:19 458
Susanville 06:46:14 -60.2 Dark Down 61.6 230.7 Up 06:31:14 - 07:01:14 404
Gimple 06:46:15 -60.3 Dark Down 61.9 230.7 Up 06:31:15 - 07:01:15 373
Greenville 06:46:15 -60.2 Dark Down 61.9 230.6 Up 06:31:15 - 07:01:15 372
Quincy 06:46:15 -60.4 Dark Down 62.1 230.9 Up 06:31:15 - 07:01:15 352
Portola 06:46:12 -60.7 Dark Down 61.9 231.8 Up 06:31:12 - 07:01:12 345
Reno 06:46:09 -61.3 Dark Down 61.6 233.2 Up 06:31:09 - 07:01:09 327
Carson City 06:46:09 -61.5 Dark Down 61.8 233.7 Up 06:31:09 - 07:01:09 291
Yerington 06:46:05 -62.0 Dark Down 61.6 234.9 Up 06:31:05 - 07:01:05 279
Gardnerville 06:46:08 -61.7 Dark Down 62.0 234.2 Up 06:31:08 - 07:01:08 266
Hawthorne 06:46:02 -62.6 Dark Down 61.5 236.4 Up 06:31:02 - 07:01:02 239
Tonopah 06:45:55 -63.7 Dark Down 60.8 239.0 Up 06:30:55 - 07:00:55 212
Lee Vining 06:46:04 -62.7 Dark Down 62.1 236.6 Up 06:31:04 - 07:01:04 175
Bishop 06:45:59 -63.5 Dark Down 62.0 238.5 Up 06:30:59 - 07:00:59 123
Beatty 06:45:51 -64.8 Dark Down 61.1 241.4 Up 06:30:51 - 07:00:51 99
Indian Springs 06:45:45 -65.6 Dark Down 60.5 243.3 Up 06:30:45 - 07:00:45 83
Lone Pine 06:45:56 -64.2 Dark Down 62.1 240.2 Up 06:30:56 - 07:00:56 49
Henderson 06:45:41 -66.4 Dark Down 60.2 244.9 Up 06:30:41 - 07:00:41 39
Patrick 06:45:35 -67.4 Dark Down 59.7 247.2 Up 06:30:35 - 07:00:35 -10
Searchlight/Boulder City 06:45:40 -66.8 Dark Down 60.4 245.9 Up 06:30:40 - 07:00:40 -20
DCO 06:45:31 -68.1 Dark Down 59.3 248.4 Up 06:30:31 - 07:00:31 -28
Kingman/Dolan Springs 06:45:35 -67.5 Dark Down 59.9 247.3 Up 06:30:35 - 07:00:35 -34
Laughlin/Bullhead City 06:45:38 -67.2 Dark Down 60.3 246.8 Up 06:30:38 - 07:00:38 -46
Mohave Valley 06:45:37 -67.4 Dark Down 60.4 247.2 Up 06:30:37 - 07:00:37 -74
Lake Havasu City 06:45:35 -67.9 Dark Down 60.4 248.2 Up 06:30:35 - 07:00:35 -111
CPSLO 06:46:06 -63.4 Dark Down 64.6 238.8 Up 06:31:06 - 07:01:06 -124
Parker 06:45:34 -68.1 Dark Down 60.5 248.8 Up 06:30:34 - 07:00:34 -147
Blythe 06:45:35 -68.3 Dark Down 60.9 249.3 Up 06:30:35 - 07:00:35 -207
Wildwood 06:45:54 -65.5 Dark Down 63.7 243.8 Up 06:30:54 - 07:00:54 -221
Idyllwild 06:45:45 -66.9 Dark Down 62.5 246.8 Up 06:30:45 - 07:00:45 -229
Calipatria 06:45:38 -68.1 Dark Down 61.8 249.2 Up 06:30:38 - 07:00:38 -274
Yuma 06:45:33 -68.9 Dark Down 61.3 250.8 Up 06:30:33 - 07:00:33 -305

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 69990, (2019/01/30 06:48UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 12.62 157
Alnath         05:26:17.5 +28:36:24  1.6 10.03 163
PPM 121513     05:52:23.4 +19:52:04  6.4  0.95 160
PPM 121502     05:51:52.1 +19:31:17  7.1  0.92 160
PPM 121423     05:48:50.4 +19:55:32  8.8  0.11 161
69990          05:48:21.3 +19:55:24 16.5       161
Positions are for J2000

Event circumstances last updated at 2017/08/04 18:04:15 UT

Marc W. Buie, Southwest Research Institute

RECON