RECON: TNO occultation with 98WY31

Event between 98WY31 and star UC4-572-033437 with event index number of 225636

Geocentric closest approach at 2019/11/21 11:53:47 UTC

J2000 position of star is 06:44:41.5 +24:13:08
Equinox of date position of star is 06:45:47.2 +24:11:57
Stellar brightness R=13.8, use SENSEUP=64
Star is 70 degrees from the moon. Moon is 32% illuminated.
TNO apparent brightness V=23.2

[RECON map]
TNO is 43.0 AU from the Sun and 42.2 AU from the Earth.
The TNO is moving 18.2 km/sec on the sky relative to the star, or, 2.1 arcsec/hr.
The 1-sigma error in the time of the event is 1221 seconds.
The 1-sigma cross-track error in the shadow position is 3953 km.
The sky-plane scale is 30640.3 km/arcsec.

The TNO has an absolute magnitude Hv=6.8
Diameter=257.0 km assuming a 5% albedo -- 14.2 sec chord
Diameter=104.9 km assuming a 30% albedo -- 5.8 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 98WY31, (2019/11/21 11:54UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:31.9 +27:58:36  1.1 14.12  57
Alhena         06:38:51.6 +16:22:50  1.9  7.99  72
PPM 096264     06:38:40.4 +24:34:21  6.5  1.69  72
PPM 096508     06:47:22.7 +23:20:57  7.4  0.91  70
PPM 096499     06:46:49.8 +24:06:16  8.7  0.23  70
PPM 096470     06:45:47.0 +24:04:19 11.0  0.13  70
98WY31         06:45:54.4 +24:11:49 13.8        70
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 0.7 sigma about the mid-time.
The median site spacing is 22.4 km RECON observability=1.0 and success probability=6.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 11:52:53 -32.9 Dark Up 61.6 215.9 Up 11:37:53 - 12:07:53 6601
Tonasket 11:52:53 -32.9 Dark Up 61.8 216.2 Up 11:37:53 - 12:07:53 6579
Okanogan 11:52:53 -33.1 Dark Up 62.1 216.3 Up 11:37:53 - 12:07:53 6544
Brewster 11:52:53 -33.2 Dark Up 62.4 216.2 Up 11:37:53 - 12:07:53 6514
Manson/Chelan 11:52:54 -33.5 Dark Up 62.7 215.8 Up 11:37:54 - 12:07:54 6488
Entiat 11:52:54 -33.6 Dark Up 62.9 215.9 Up 11:37:54 - 12:07:54 6466
Wenatchee 11:52:54 -33.7 Dark Up 63.2 216.0 Up 11:37:54 - 12:07:54 6439
Ellensburg 11:52:54 -33.9 Dark Up 63.6 216.1 Up 11:37:54 - 12:07:54 6395
Yakima 11:52:53 -33.9 Dark Up 63.9 216.6 Up 11:37:53 - 12:07:53 6355
Pasco 11:52:47 -33.0 Dark Up 63.6 219.6 Up 11:37:47 - 12:07:47 6346
Toppenish/White Swan 11:52:53 -33.9 Dark Up 64.0 217.2 Up 11:37:53 - 12:07:53 6336
PNWRO 11:52:44 -32.9 Dark Up 63.7 220.3 Up 11:37:44 - 12:07:44 6325
George/Umatilla 11:52:47 -33.2 Dark Up 64.0 219.6 Up 11:37:47 - 12:07:47 6309
Goldendale 11:52:53 -34.2 Dark Up 64.7 217.1 Up 11:37:53 - 12:07:53 6274
The Dalles 11:52:54 -34.5 Dark Up 65.0 216.7 Up 11:37:54 - 12:07:54 6246
Maupin 11:52:53 -34.5 Dark Up 65.3 217.4 Up 11:37:53 - 12:07:53 6206
Madras/Culver 11:52:52 -34.5 Dark Up 65.7 218.0 Up 11:37:52 - 12:07:52 6151
Redmond 11:52:52 -34.6 Dark Up 66.0 218.4 Up 11:37:52 - 12:07:52 6114
Sisters 11:52:53 -34.9 Dark Up 66.2 217.6 Up 11:37:53 - 12:07:53 6110
Bend 11:52:51 -34.7 Dark Up 66.3 218.5 Up 11:37:51 - 12:07:51 6090
Oregon Observatory 11:52:52 -34.8 Dark Up 66.5 218.4 Up 11:37:52 - 12:07:52 6070
La Pine/Gilchrist 11:52:52 -34.9 Dark Up 66.7 218.6 Up 11:37:52 - 12:07:52 6049
Niwot 11:51:38 -22.9 Dark Up 59.0 248.9 Up 11:36:38 - 12:06:38 6041
North Lake 11:52:48 -34.5 Dark Up 66.7 220.4 Up 11:37:48 - 12:07:48 6015
Paisley 11:52:46 -34.3 Dark Up 67.0 222.0 Up 11:37:46 - 12:07:46 5966
Chiloquin 11:52:51 -35.3 Dark Up 67.7 219.6 Up 11:37:51 - 12:07:51 5930
Lakeview 11:52:44 -34.2 Dark Up 67.2 223.2 Up 11:37:44 - 12:07:44 5917
Klamath Falls 11:52:51 -35.2 Dark Up 67.9 220.3 Up 11:37:51 - 12:07:51 5896
Tulelake 11:52:49 -35.0 Dark Up 68.0 221.3 Up 11:37:49 - 12:07:49 5874
Cedarville 11:52:42 -34.1 Dark Up 67.6 224.6 Up 11:37:42 - 12:07:42 5854
Fall River/Burney 11:52:47 -35.0 Dark Up 68.6 223.0 Up 11:37:47 - 12:07:47 5782
Susanville 11:52:42 -34.5 Dark Up 68.7 225.6 Up 11:37:42 - 12:07:42 5731
Gimple 11:52:44 -34.7 Dark Up 69.0 225.7 Up 11:37:44 - 12:07:44 5699
Greenville 11:52:43 -34.8 Dark Up 69.0 225.5 Up 11:37:43 - 12:07:43 5697
Quincy 11:52:44 -34.8 Dark Up 69.2 225.9 Up 11:37:44 - 12:07:44 5676
Portola 11:52:41 -34.4 Dark Up 69.0 227.1 Up 11:37:41 - 12:07:41 5672
Reno 11:52:37 -33.9 Dark Up 68.8 228.8 Up 11:37:37 - 12:07:37 5657
Carson City 11:52:37 -33.9 Dark Up 69.0 229.6 Up 11:37:37 - 12:07:37 5620
Yerington 11:52:34 -33.4 Dark Up 68.8 231.2 Up 11:37:34 - 12:07:34 5612
Gardnerville 11:52:37 -33.9 Dark Up 69.2 230.2 Up 11:37:37 - 12:07:37 5596
Hawthorne 11:52:30 -33.0 Dark Up 68.8 233.1 Up 11:37:30 - 12:07:30 5575
Tonopah 11:52:23 -32.0 Dark Up 68.1 236.5 Up 11:37:23 - 12:07:23 5555
Lee Vining 11:52:32 -33.4 Dark Up 69.4 233.4 Up 11:37:32 - 12:07:32 5507
Bishop 11:52:27 -32.9 Dark Up 69.3 235.9 Up 11:37:27 - 12:07:27 5459
Beatty 11:52:19 -31.6 Dark Up 68.5 239.7 Up 11:37:19 - 12:07:19 5445
Indian Springs 11:52:14 -30.7 Dark Up 67.9 242.1 Up 11:37:14 - 12:07:14 5434
Henderson 11:52:10 -30.1 Dark Up 67.6 244.2 Up 11:37:10 - 12:07:10 5394
Lone Pine 11:52:25 -32.6 Dark Up 69.5 238.2 Up 11:37:25 - 12:07:25 5387
Patrick 11:52:04 -29.2 Dark Up 67.1 247.1 Up 11:37:04 - 12:07:04 5354
DCO 11:52:00 -28.6 Dark Up 66.7 248.7 Up 11:37:00 - 12:07:00 5339
Searchlight/Boulder City 11:52:08 -30.0 Dark Up 67.8 245.6 Up 11:37:08 - 12:07:08 5336
Kingman/Dolan Springs 11:52:04 -29.3 Dark Up 67.3 247.4 Up 11:37:04 - 12:07:04 5327
Laughlin/Bullhead City 11:52:07 -29.7 Dark Up 67.7 246.7 Up 11:37:07 - 12:07:07 5313
Mohave Valley 11:52:06 -29.7 Dark Up 67.8 247.3 Up 11:37:06 - 12:07:06 5285
Lake Havasu City 11:52:04 -29.5 Dark Up 67.8 248.6 Up 11:37:04 - 12:07:04 5249
Parker 11:52:03 -29.4 Dark Up 67.9 249.4 Up 11:37:03 - 12:07:03 5213
CPSLO 11:52:34 -34.6 Dark Up 71.9 236.6 Up 11:37:34 - 12:07:34 5199
Blythe 11:52:03 -29.6 Dark Up 68.3 250.3 Up 11:37:03 - 12:07:03 5151
Idyllwild 11:52:13 -31.4 Dark Up 69.9 247.2 Up 11:37:13 - 12:07:13 5115
Wildwood 11:52:23 -32.9 Dark Up 71.1 243.4 Up 11:37:23 - 12:07:23 5113
Calipatria 11:52:07 -30.4 Dark Up 69.2 250.3 Up 11:37:07 - 12:07:07 5078
Yuma 11:52:02 -29.6 Dark Up 68.6 252.4 Up 11:37:02 - 12:07:02 5053

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 98WY31, (2019/11/21 11:54UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:18.1 +28:01:33  1.1 14.12  57
Alhena         06:37:42.8 +16:23:57  1.9  7.99  72
PPM 096264     06:37:27.2 +24:35:27  6.5  1.69  72
PPM 096508     06:46:10.3 +23:22:17  7.4  0.91  70
PPM 096499     06:45:37.0 +24:07:36  8.7  0.23  70
PPM 096470     06:44:34.2 +24:05:37 11.0  0.13  70
98WY31         06:44:41.5 +24:13:08 13.8        70
Positions are for J2000

Event circumstances last updated at 2017/12/07 17:07:03 UT

Marc W. Buie, Southwest Research Institute

RECON