RECON: TNO occultation with 99XY143

Event between 99XY143 and star UC4-551-030915 with event index number of 92279

Geocentric closest approach at 2017/11/28 12:24:55 UTC

J2000 position of star is 06:40:45.8 +20:11:04
Equinox of date position of star is 06:41:43.6 +20:10:06
Stellar brightness R=16.2
Star is 102 degrees from the moon. Moon is 68% illuminated.
TNO apparent brightness V=22.7

[RECON map]
TNO is 44.7 AU from the Sun and 43.9 AU from the Earth.
The TNO is moving 21.1 km/sec on the sky relative to the star, or, 2.4 arcsec/hr.
The 1-sigma error in the time of the event is 327 seconds.
The 1-sigma cross-track error in the shadow position is 1675 km.

The TNO has an absolute magnitude Hv=6.1
Diameter=363.1 km assuming a 5% albedo -- 17.2 sec chord
Diameter=148.2 km assuming a 30% albedo -- 7.0 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 99XY143, (2017/11/28 12:25UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:24.6 +27:58:54  1.1 16.66 116
Alhena         06:38:44.8 +16:22:57  1.9  3.85 101
PPM 123009     06:47:24.2 +18:49:03  6.5  1.88 103
PPM 096368     06:42:07.2 +20:37:38  8.3  0.47 102
PPM 122856     06:41:20.2 +19:55:41  9.4  0.26 102
99XY143        06:41:49.6 +20:10:00 16.2       102
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 24.9 km RECON observability=1.0 and success probability=6.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 12:23:05 -29.4 Dark Down 50.6 235.2 Up 11:55:18 - 12:50:52 4824
Tonasket 12:23:05 -29.4 Dark Down 50.7 235.5 Up 11:55:18 - 12:50:52 4803
Okanogan 12:23:04 -29.5 Dark Down 51.0 235.6 Up 11:55:17 - 12:50:51 4769
Brewster 12:23:04 -29.6 Dark Down 51.3 235.7 Up 11:55:17 - 12:50:51 4741
Manson/Chelan 12:23:05 -29.9 Dark Down 51.6 235.4 Up 11:55:18 - 12:50:52 4716
Entiat 12:23:05 -29.9 Dark Down 51.8 235.6 Up 11:55:18 - 12:50:52 4694
Wenatchee 12:23:04 -30.0 Dark Down 52.0 235.7 Up 11:55:17 - 12:50:51 4669
Ellensburg 12:23:04 -30.2 Dark Down 52.3 235.9 Up 11:55:17 - 12:50:51 4627
Yakima 12:23:03 -30.2 Dark Down 52.6 236.3 Up 11:55:16 - 12:50:50 4588
Toppenish/White Swan 12:23:02 -30.1 Dark Down 52.6 236.7 Up 11:55:15 - 12:50:49 4570
Pasco 12:22:58 -29.2 Dark Down 51.9 238.4 Up 11:55:11 - 12:50:45 4578
PNWRO 12:22:57 -29.0 Dark Down 51.9 238.9 Up 11:55:10 - 12:50:44 4558
George/Umatilla 12:22:58 -29.3 Dark Down 52.2 238.5 Up 11:55:11 - 12:50:45 4542
Goldendale 12:23:02 -30.4 Dark Down 53.1 236.8 Up 11:55:15 - 12:50:49 4511
The Dalles 12:23:03 -30.6 Dark Down 53.5 236.6 Up 11:55:16 - 12:50:50 4484
Maupin 12:23:02 -30.5 Dark Down 53.6 237.2 Up 11:55:15 - 12:50:49 4445
Madras/Culver 12:23:01 -30.6 Dark Down 54.0 237.8 Up 11:55:14 - 12:50:48 4392
Sisters 12:23:02 -30.9 Dark Down 54.4 237.6 Up 11:55:15 - 12:50:49 4353
Redmond 12:23:00 -30.6 Dark Down 54.2 238.2 Up 11:55:13 - 12:50:47 4357
Bend 12:23:01 -30.7 Dark Down 54.4 238.2 Up 11:55:14 - 12:50:48 4334
Oregon Observatory 12:23:00 -30.8 Dark Down 54.6 238.3 Up 11:55:13 - 12:50:47 4315
LaPine/Gilchrist 12:23:00 -30.8 Dark Down 54.7 238.5 Up 11:55:13 - 12:50:47 4294
North Lake 12:22:58 -30.4 Dark Down 54.6 239.7 Up 11:55:11 - 12:50:45 4261
Paisley 12:22:55 -30.1 Dark Down 54.6 240.8 Up 11:55:08 - 12:50:42 4212
Chiloquin 12:22:59 -31.1 Dark Down 55.5 239.4 Up 11:55:12 - 12:50:46 4180
Klamath Falls 12:22:58 -31.0 Dark Down 55.6 239.9 Up 11:55:11 - 12:50:45 4147
Lakeview 12:22:54 -29.9 Dark Down 54.7 241.6 Up 11:55:07 - 12:50:41 4166
Tulelake 12:22:57 -30.8 Dark Down 55.6 240.6 Up 11:55:10 - 12:50:44 4125
Cedarville 12:22:52 -29.8 Dark Down 54.9 242.7 Up 11:55:05 - 12:50:39 4103
Fall River/Burney 12:22:55 -30.7 Dark Down 56.0 241.9 Up 11:55:08 - 12:50:42 4036
Susanville 12:22:52 -30.1 Dark Down 55.8 243.5 Up 11:55:05 - 12:50:39 3985
Greenville 12:22:51 -30.3 Dark Down 56.1 243.6 Up 11:55:04 - 12:50:38 3952
Niwot 12:22:03 -18.5 Dark Down 44.8 258.4 Up 11:54:16 - 12:49:50 4253
Quincy 12:22:51 -30.3 Dark Down 56.2 243.8 Up 11:55:04 - 12:50:38 3932
Portola 12:22:49 -29.9 Dark Down 55.9 244.5 Up 11:55:02 - 12:50:36 3927
Reno 12:22:47 -29.4 Dark Down 55.6 245.6 Up 11:55:00 - 12:50:34 3911
Carson City 12:22:46 -29.4 Dark Down 55.7 246.1 Up 11:54:59 - 12:50:33 3875
Yerington 12:22:43 -28.9 Dark Down 55.3 247.0 Up 11:54:56 - 12:50:30 3867
Gardnerville 12:22:45 -29.3 Dark Down 55.8 246.5 Up 11:54:58 - 12:50:32 3852
Hawthorne 12:22:40 -28.4 Dark Down 55.1 248.2 Up 11:54:53 - 12:50:27 3829
Lee Vining 12:22:41 -28.7 Dark Down 55.7 248.5 Up 11:54:54 - 12:50:28 3763
Tonopah 12:22:35 -27.3 Dark Down 54.3 250.2 Up 11:54:48 - 12:50:22 3807
Bishop 12:22:38 -28.1 Dark Down 55.4 250.0 Up 11:54:51 - 12:50:25 3715
Lone Pine 12:22:35 -27.8 Dark Down 55.4 251.4 Up 11:54:48 - 12:50:22 3644
Beatty 12:22:31 -26.8 Dark Down 54.3 252.2 Up 11:54:44 - 12:50:18 3698
Indian Springs 12:22:27 -25.9 Dark Down 53.6 253.6 Up 11:54:40 - 12:50:14 3685
Henderson 12:22:24 -25.3 Dark Down 53.2 254.9 Up 11:54:37 - 12:50:11 3644
Searchlight/Boulder City 12:22:23 -25.1 Dark Down 53.3 255.7 Up 11:54:36 - 12:50:10 3587
CPSLO 12:22:42 -29.7 Dark Down 57.8 250.7 Up 11:54:55 - 12:50:29 3464
Kingman/Dolan Springs 12:22:19 -24.4 Dark Down 52.7 256.8 Up 11:54:32 - 12:50:06 3576
Laughlin/Bullhead City 12:22:21 -24.8 Dark Down 53.1 256.4 Up 11:54:34 - 12:50:08 3563
DCO 12:22:16 -23.7 Dark Down 52.0 257.6 Up 11:54:29 - 12:50:03 3586
Mohave Valley 12:22:21 -24.8 Dark Down 53.2 256.7 Up 11:54:34 - 12:50:08 3535
Lake Havasu City 12:22:19 -24.5 Dark Down 53.1 257.4 Up 11:54:32 - 12:50:06 3499
Parker 12:22:18 -24.4 Dark Down 53.1 257.9 Up 11:54:31 - 12:50:05 3464
Idyllwild 12:22:25 -26.3 Dark Down 55.2 256.5 Up 11:54:38 - 12:50:12 3374
Blythe 12:22:18 -24.6 Dark Down 53.5 258.4 Up 11:54:31 - 12:50:05 3404
Calipatria 12:22:21 -25.2 Dark Down 54.3 258.3 Up 11:54:34 - 12:50:08 3334
Yuma 12:22:17 -24.4 Dark Down 53.7 259.6 Up 11:54:30 - 12:50:04 3307

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.

Event circumstances last updated at 2016/03/21 17:22:46 UT

Marc W. Buie, Southwest Research Institute

RECON