RECON: TNO occultation with 98WG24

Event between 98WG24 and star UC4-567-034942 with event index number of 95962

Geocentric closest approach at 2017/12/27 08:01:39 UTC

J2000 position of star is 07:00:47.6 +23:18:47
Equinox of date position of star is 07:01:50.7 +23:17:15
Stellar brightness R=15.3, use SENSEUP=128
Star is 87 degrees from the moon. Moon is 60% illuminated.
TNO apparent brightness V=22.6

[RECON map]
TNO is 40.1 AU from the Sun and 39.1 AU from the Earth.
The TNO is moving 25.0 km/sec on the sky relative to the star, or, 3.2 arcsec/hr.
The 1-sigma error in the time of the event is 303 seconds.
The 1-sigma cross-track error in the shadow position is 1803 km.
The sky-plane scale is 28345.2 km/arcsec.

The TNO has an absolute magnitude Hv=6.6
Diameter=295.1 km assuming a 5% albedo -- 11.8 sec chord
Diameter=120.5 km assuming a 30% albedo -- 4.8 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 98WG24, (2017/12/27 08:02UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:24.9 +27:58:53  1.1 11.07  96
Alhena         06:38:45.1 +16:22:57  1.9  8.79  81
42Ome Gem      07:03:30.5 +24:11:18  5.2  0.98  87
PPM 096879     07:01:45.8 +23:24:49  7.2  0.13  87
98WG24         07:01:52.9 +23:17:12 15.3        87
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 3.0 sigma about the mid-time.
The median site spacing is 24.7 km RECON observability=1.0 and success probability=8.6%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 08:02:15 -64.4 Dark Up 63.6 163.1 Up 07:47:15 - 08:17:15 4693
Tonasket 08:02:15 -64.6 Dark Up 63.8 163.0 Up 07:47:15 - 08:17:15 4670
Okanogan 08:02:15 -64.9 Dark Up 64.1 162.5 Up 07:47:15 - 08:17:15 4635
Brewster 08:02:16 -65.2 Dark Up 64.3 161.9 Up 07:47:16 - 08:17:16 4607
Manson/Chelan 08:02:17 -65.4 Dark Up 64.5 161.0 Up 07:47:17 - 08:17:17 4584
Entiat 08:02:17 -65.6 Dark Up 64.6 160.7 Up 07:47:17 - 08:17:17 4561
Wenatchee 08:02:18 -65.9 Dark Up 64.9 160.3 Up 07:47:18 - 08:17:18 4535
Ellensburg 08:02:19 -66.3 Dark Up 65.2 159.6 Up 07:47:19 - 08:17:19 4492
Yakima 08:02:19 -66.7 Dark Up 65.6 159.2 Up 07:47:19 - 08:17:19 4450
Toppenish/White Swan 08:02:18 -66.9 Dark Up 65.8 159.4 Up 07:47:18 - 08:17:18 4429
Pasco 08:02:14 -67.0 Dark Up 66.2 162.1 Up 07:47:14 - 08:17:14 4422
PNWRO 08:02:13 -67.3 Dark Up 66.5 162.4 Up 07:47:13 - 08:17:13 4398
George/Umatilla 08:02:15 -67.4 Dark Up 66.5 161.4 Up 07:47:15 - 08:17:15 4386
Goldendale 08:02:20 -67.5 Dark Up 66.2 158.1 Up 07:47:20 - 08:17:20 4370
The Dalles 08:02:20 -67.7 Dark Up 66.3 157.1 Up 07:47:20 - 08:17:20 4346
Maupin 08:02:20 -68.1 Dark Up 66.8 156.9 Up 07:47:20 - 08:17:20 4303
Madras/Culver 08:02:20 -68.7 Dark Up 67.2 156.3 Up 07:47:20 - 08:17:20 4246
Sisters 08:02:22 -69.0 Dark Up 67.4 155.0 Up 07:47:22 - 08:17:22 4210
Redmond 08:02:20 -69.0 Dark Up 67.6 155.9 Up 07:47:20 - 08:17:20 4209
Bend 08:02:21 -69.2 Dark Up 67.7 155.3 Up 07:47:21 - 08:17:21 4186
Oregon Observatory 08:02:22 -69.4 Dark Up 67.8 154.9 Up 07:47:22 - 08:17:22 4167
La Pine/Gilchrist 08:02:22 -69.6 Dark Up 68.0 154.5 Up 07:47:22 - 08:17:22 4146
North Lake 08:02:20 -70.1 Dark Up 68.6 155.4 Up 07:47:20 - 08:17:20 4102
Paisley 08:02:18 -70.6 Dark Up 69.2 155.7 Up 07:47:18 - 08:17:18 4046
Chiloquin 08:02:22 -70.7 Dark Up 68.9 152.4 Up 07:47:22 - 08:17:22 4028
Lakeview 08:02:18 -71.1 Dark Up 69.7 155.6 Up 07:47:18 - 08:17:18 3994
Klamath Falls 08:02:22 -71.0 Dark Up 69.2 152.2 Up 07:47:22 - 08:17:22 3992
Tulelake 08:02:21 -71.3 Dark Up 69.5 152.6 Up 07:47:21 - 08:17:21 3965
Cedarville 08:02:17 -71.8 Dark Up 70.4 155.3 Up 07:47:17 - 08:17:17 3925
Niwot 08:01:27 -69.0 Dark Down 72.5 198.6 Up 07:46:27 - 08:16:27 3907
Fall River/Burney 08:02:21 -72.2 Dark Up 70.4 151.6 Up 07:47:21 - 08:17:21 3869
Susanville 08:02:19 -72.9 Dark Up 71.2 152.7 Up 07:47:19 - 08:17:19 3805
Gimple 08:02:20 -73.2 Dark Up 71.4 151.7 Up 07:47:20 - 08:17:20 3774
Greenville 08:02:20 -73.2 Dark Up 71.3 151.5 Up 07:47:20 - 08:17:20 3774
Quincy 08:02:20 -73.4 Dark Up 71.5 151.2 Up 07:47:20 - 08:17:20 3752
Portola 08:02:18 -73.5 Dark Up 71.8 152.3 Up 07:47:18 - 08:17:18 3741
Reno 08:02:16 -73.8 Dark Up 72.3 153.7 Up 07:47:16 - 08:17:16 3716
Carson City 08:02:16 -74.1 Dark Up 72.6 153.3 Up 07:47:16 - 08:17:16 3677
Yerington 08:02:13 -74.3 Dark Up 73.0 154.8 Up 07:47:13 - 08:17:13 3660
Gardnerville 08:02:15 -74.4 Dark Up 72.8 153.0 Up 07:47:15 - 08:17:15 3651
Hawthorne 08:02:12 -74.7 Dark Up 73.6 155.7 Up 07:47:12 - 08:17:12 3613
Tonopah 08:02:08 -75.0 Dark Up 74.4 159.5 Up 07:47:08 - 08:17:08 3571
Lee Vining 08:02:13 -75.3 Dark Up 73.9 153.4 Up 07:47:13 - 08:17:13 3550
Bishop 08:02:11 -75.9 Dark Up 74.7 154.7 Up 07:47:11 - 08:17:11 3489
Beatty 08:02:05 -76.1 Dark Up 75.6 159.5 Up 07:47:05 - 08:17:05 3450
Indian Springs 08:02:02 -76.2 Dark Up 76.2 162.9 Up 07:47:02 - 08:17:02 3422
Lone Pine 08:02:10 -76.6 Dark Up 75.5 154.6 Up 07:47:10 - 08:17:10 3409
Henderson 08:01:59 -76.5 Dark Up 76.9 164.9 Up 07:46:59 - 08:16:59 3370
Patrick 08:01:55 -76.7 Dark Up 77.7 168.8 Up 07:46:55 - 08:16:55 3311
Searchlight/Boulder City 08:01:59 -77.0 Dark Up 77.4 164.5 Up 07:46:59 - 08:16:59 3308
Kingman/Dolan Springs 08:01:55 -77.0 Dark Up 77.9 167.8 Up 07:46:55 - 08:16:55 3286
DCO 08:01:52 -76.7 Dark Up 78.1 171.6 Up 07:46:52 - 08:16:52 3285
Laughlin/Bullhead City 08:01:57 -77.2 Dark Up 77.8 165.6 Up 07:46:57 - 08:16:57 3279
CPSLO 08:02:19 -78.0 Dark Up 75.5 143.6 Up 07:47:19 - 08:17:19 3254
Mohave Valley 08:01:57 -77.4 Dark Up 78.1 165.3 Up 07:46:57 - 08:16:57 3249
Lake Havasu City 08:01:56 -77.7 Dark Up 78.5 165.9 Up 07:46:56 - 08:16:56 3208
Parker 08:01:56 -78.0 Dark Up 78.9 165.6 Up 07:46:56 - 08:16:56 3170
Wildwood 08:02:11 -79.1 Dark Up 77.5 147.6 Up 07:47:11 - 08:17:11 3133
Blythe 08:01:57 -78.6 Dark Up 79.3 163.5 Up 07:46:57 - 08:16:57 3110
Idyllwild 08:02:05 -79.1 Dark Up 78.6 154.2 Up 07:47:05 - 08:17:05 3107
Calipatria 08:02:00 -79.3 Dark Up 79.5 158.2 Up 07:47:00 - 08:17:00 3049
Yuma 08:01:57 -79.4 Dark Up 80.2 161.7 Up 07:46:57 - 08:16:57 3009

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 98WG24, (2017/12/27 08:02UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:18.1 +28:01:33  1.1 11.07  96
Alhena         06:37:42.8 +16:23:57  1.9  8.79  81
42Ome Gem      07:02:24.8 +24:12:55  5.2  0.98  87
PPM 096879     07:00:40.4 +23:26:24  7.2  0.13  87
98WG24         07:00:47.6 +23:18:47 15.3        87
Positions are for J2000

Event circumstances last updated at 2017/05/20 18:04:59 UT

Marc W. Buie, Southwest Research Institute

RECON