RECON: TNO occultation with 98WY31

Event between 98WY31 and star GA1140:02489559 with event index number of 332733

Geocentric closest approach at 2019/11/21 10:46:56 UTC

J2000 position of star is 06:44:41.5 +24:13:07
Equinox of date position of star is 06:45:52.6 +24:11:51
Stellar brightness G=13.8, use SENSEUP=64
Star is 69 degrees from the moon. Moon is 33% 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 18.1 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 684 seconds.
The 1-sigma cross-track error in the shadow position is 1682 km.
The sky-plane scale is 30640.3 km/arcsec.

The TNO has an absolute magnitude Hv=6.8
Diameter=237.7 km assuming a 5% albedo -- 14.2 sec chord
Diameter=97.0 km assuming a 30% albedo -- 5.8 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 98WY31, (2019/11/21 10:47UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:31.8 +27:58:36  1.1 14.12  56
Alhena         06:38:51.6 +16:22:50  1.9  7.99  71
PPM 096264     06:38:40.4 +24:34:21  6.5  1.69  71
PPM 096508     06:47:22.7 +23:20:57  7.4  0.91  69
PPM 096499     06:46:49.8 +24:06:16  8.7  0.23  69
PPM 096470     06:45:47.0 +24:04:19 11.0  0.13  69
98WY31         06:45:54.4 +24:11:49 13.8        69
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 1.3 sigma about the mid-time.
The median site spacing is 23.7 km RECON observability=1.0 and success probability=6.3%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 10:47:07 -42.9 Dark Up 64.3 182.9 Up 10:32:07 - 11:02:07 5120
Summerland 10:47:09 -43.2 Dark Up 64.6 182.3 Up 10:32:09 - 11:02:09 5088
Penticton 10:47:08 -43.2 Dark Up 64.7 182.6 Up 10:32:08 - 11:02:08 5082
Okanagan Falls 10:47:08 -43.3 Dark Up 64.9 182.5 Up 10:32:08 - 11:02:08 5063
Oliver 10:47:08 -43.3 Dark Up 65.0 182.6 Up 10:32:08 - 11:02:08 5047
Anarchist Mountain Observatory 10:47:07 -43.3 Dark Up 65.2 183.0 Up 10:32:07 - 11:02:07 5031
Oroville 10:47:06 -43.3 Dark Up 65.3 182.9 Up 10:32:06 - 11:02:06 5023
Tonasket 10:47:08 -43.4 Dark Up 65.5 182.9 Up 10:32:08 - 11:02:08 5000
Okanogan 10:47:07 -43.6 Dark Up 65.8 182.6 Up 10:32:07 - 11:02:07 4965
Brewster 10:47:07 -43.9 Dark Up 66.1 182.2 Up 10:32:07 - 11:02:07 4935
Manson/Chelan 10:47:09 -44.2 Dark Up 66.3 181.4 Up 10:32:09 - 11:02:09 4911
Entiat 10:47:09 -44.3 Dark Up 66.5 181.2 Up 10:32:09 - 11:02:09 4888
Wenatchee 10:47:10 -44.4 Dark Up 66.8 181.0 Up 10:32:10 - 11:02:10 4862
Ellensburg 10:47:10 -44.7 Dark Up 67.2 180.5 Up 10:32:10 - 11:02:10 4818
Yakima 10:47:10 -44.9 Dark Up 67.6 180.5 Up 10:32:10 - 11:02:10 4776
Toppenish/White Swan 10:47:10 -44.9 Dark Up 67.8 180.9 Up 10:32:10 - 11:02:10 4756
Pasco 10:47:04 -44.1 Dark Up 67.9 184.0 Up 10:32:04 - 11:02:04 4754
PNWRO 10:47:03 -44.0 Dark Up 68.2 184.5 Up 10:32:03 - 11:02:03 4731
George/Umatilla 10:47:05 -44.3 Dark Up 68.3 183.5 Up 10:32:05 - 11:02:05 4718
Goldendale 10:47:11 -45.3 Dark Up 68.4 179.9 Up 10:32:11 - 11:02:11 4695
The Dalles 10:47:12 -45.6 Dark Up 68.6 179.0 Up 10:32:12 - 11:02:12 4669
Maupin 10:47:12 -45.7 Dark Up 69.0 179.2 Up 10:32:12 - 11:02:12 4627
Madras/Culver 10:47:12 -45.9 Dark Up 69.6 179.1 Up 10:32:12 - 11:02:12 4570
Redmond 10:47:11 -46.1 Dark Up 69.9 178.9 Up 10:32:11 - 11:02:11 4533
Sisters 10:47:12 -46.3 Dark Up 69.9 177.9 Up 10:32:12 - 11:02:12 4532
Bend 10:47:12 -46.2 Dark Up 70.2 178.6 Up 10:32:12 - 11:02:12 4509
Oregon Observatory 10:47:12 -46.4 Dark Up 70.3 178.2 Up 10:32:12 - 11:02:12 4490
La Pine/Gilchrist 10:47:12 -46.5 Dark Up 70.5 178.0 Up 10:32:12 - 11:02:12 4468
North Lake 10:47:10 -46.2 Dark Up 71.0 179.6 Up 10:32:10 - 11:02:10 4428
Paisley 10:47:08 -46.1 Dark Up 71.5 180.6 Up 10:32:08 - 11:02:08 4373
Chiloquin 10:47:14 -47.1 Dark Up 71.6 176.9 Up 10:32:14 - 11:02:14 4349
Lakeview 10:47:07 -46.2 Dark Up 72.0 181.2 Up 10:32:07 - 11:02:07 4322
Klamath Falls 10:47:13 -47.1 Dark Up 72.0 177.1 Up 10:32:13 - 11:02:13 4314
Niwot 10:45:56 -35.5 Dark Up 69.6 223.6 Up 10:30:56 - 11:00:56 4306
SwRI 10:45:56 -35.5 Dark Up 69.7 223.6 Up 10:30:56 - 11:00:56 4294
Tulelake 10:47:12 -47.0 Dark Up 72.3 177.9 Up 10:32:12 - 11:02:12 4288
Cedarville 10:47:05 -46.2 Dark Up 72.7 181.8 Up 10:32:05 - 11:02:05 4254
Fall River/Burney 10:47:10 -47.2 Dark Up 73.2 178.0 Up 10:32:10 - 11:02:10 4192
Susanville 10:47:07 -46.8 Dark Up 73.8 180.3 Up 10:32:07 - 11:02:07 4132
Gimple 10:47:08 -47.1 Dark Up 74.1 179.7 Up 10:32:08 - 11:02:08 4101
Greenville 10:47:08 -47.1 Dark Up 74.1 179.4 Up 10:32:08 - 11:02:08 4100
Quincy 10:47:07 -47.2 Dark Up 74.3 179.4 Up 10:32:07 - 11:02:07 4079
Portola 10:47:05 -46.9 Dark Up 74.4 181.0 Up 10:32:05 - 11:02:05 4069
Reno 10:47:02 -46.5 Dark Up 74.7 183.2 Up 10:32:02 - 11:02:02 4047
Carson City 10:47:02 -46.5 Dark Up 75.0 183.3 Up 10:32:02 - 11:02:02 4009
Yerington 10:46:59 -46.1 Dark Up 75.2 185.6 Up 10:31:59 - 11:01:59 3995
Gardnerville 10:47:01 -46.5 Dark Up 75.3 183.5 Up 10:32:01 - 11:02:01 3984
Hawthorne 10:46:56 -45.8 Dark Up 75.6 187.7 Up 10:31:56 - 11:01:56 3951
Tonopah 10:46:49 -44.8 Dark Up 75.8 193.0 Up 10:31:49 - 11:01:49 3916
Lee Vining 10:46:58 -46.3 Dark Up 76.2 186.1 Up 10:31:58 - 11:01:58 3885
Bishop 10:46:54 -45.8 Dark Up 76.7 189.2 Up 10:31:54 - 11:01:54 3829
Beatty 10:46:46 -44.6 Dark Up 76.9 195.9 Up 10:31:46 - 11:01:46 3797
Indian Springs 10:46:41 -43.8 Dark Up 76.9 200.5 Up 10:31:41 - 11:01:41 3775
Lone Pine 10:46:52 -45.7 Dark Up 77.4 191.1 Up 10:31:52 - 11:01:52 3751
Henderson 10:46:36 -43.4 Dark Up 77.2 203.9 Up 10:31:36 - 11:01:36 3727
Patrick 10:46:31 -42.5 Dark Up 77.4 209.4 Up 10:31:31 - 11:01:31 3674
Searchlight/Boulder City 10:46:36 -43.4 Dark Up 77.7 205.3 Up 10:31:36 - 11:01:36 3666
DCO 10:46:27 -42.0 Dark Up 77.3 212.6 Up 10:31:27 - 11:01:27 3651
Kingman/Dolan Springs 10:46:32 -42.7 Dark Up 77.6 209.1 Up 10:31:32 - 11:01:32 3648
Laughlin/Bullhead City 10:46:34 -43.1 Dark Up 77.9 207.2 Up 10:31:34 - 11:01:34 3639
Mohave Valley 10:46:33 -43.1 Dark Up 78.1 207.8 Up 10:31:33 - 11:01:33 3609
CPSLO 10:47:04 -47.9 Dark Up 78.9 180.4 Up 10:32:04 - 11:02:04 3584
Lake Havasu City 10:46:32 -43.0 Dark Up 78.4 209.7 Up 10:31:32 - 11:01:32 3569
Parker 10:46:32 -43.0 Dark Up 78.7 210.7 Up 10:31:32 - 11:01:32 3532
Wildwood 10:46:53 -46.5 Dark Up 80.0 191.0 Up 10:31:53 - 11:01:53 3474
Blythe 10:46:32 -43.3 Dark Up 79.2 210.8 Up 10:31:32 - 11:01:32 3471
Idyllwild 10:46:43 -45.0 Dark Up 79.9 200.9 Up 10:31:43 - 11:01:43 3457
Calipatria 10:46:37 -44.1 Dark Up 80.0 208.0 Up 10:31:37 - 11:01:37 3406
Yuma 10:46:32 -43.3 Dark Up 80.0 213.3 Up 10:31:32 - 11:01:32 3371

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 10:47UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:18.0 +28:01:33  1.1 14.12  56
Alhena         06:37:42.8 +16:23:57  1.9  7.99  71
PPM 096264     06:37:27.2 +24:35:27  6.5  1.69  71
PPM 096508     06:46:10.3 +23:22:17  7.4  0.91  69
PPM 096499     06:45:37.0 +24:07:36  8.7  0.23  69
PPM 096470     06:44:34.2 +24:05:37 11.0  0.13  69
98WY31         06:44:41.5 +24:13:07 13.8        69
Positions are for J2000

Event circumstances last updated at 2019/05/23 22:42:56 UT

Marc W. Buie, Southwest Research Institute

RECON