RECON: TNO occultation with 98WY31

Event between 98WY31 and star GA1140:02646860 with event index number of 1238383

Geocentric closest approach at 2022/12/23 07:18:33 UTC

J2000 position of star is 06:59:47.4 +24:01:38
Equinox of date position of star is 07:00:58.1 +23:59:57
Stellar brightness G=14.7, use SENSEUP=128
Star is 166 degrees from the moon. Moon is 0% illuminated.
TNO apparent brightness V=23.1

[RECON map]
TNO is 42.7 AU from the Sun and 41.7 AU from the Earth.
The TNO is moving 24.9 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 711 seconds.
The 1-sigma cross-track error in the shadow position is 2350 km.
The sky-plane scale is 30253.2 km/arcsec.

The TNO has an absolute magnitude Hv=6.8
Diameter=237.7 km assuming a 5% albedo -- 10.3 sec chord
Diameter=97.0 km assuming a 30% albedo -- 4.2 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 98WY31, (2022/12/23 07:19UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:43.3 +27:58:08  1.1 10.97 156
Alhena         06:39:02.3 +16:22:40  1.9  9.22 166
42Ome Gem      07:03:48.7 +24:10:50  5.2  0.63 165
PPM 096887     07:02:17.0 +24:26:49  8.5  0.52 166
PPM 096907     07:02:53.5 +24:12:43  9.9  0.45 166
98WY31         07:01:11.3 +23:59:38 14.7       166
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 23.0 km RECON observability=1.0 and success probability=12.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 07:19:46 -62.6 Dark Down 58.7 137.5 Up 07:04:46 - 07:34:46 4559
Summerland 07:19:46 -62.8 Dark Down 58.8 136.7 Up 07:04:46 - 07:34:46 4531
Penticton 07:19:46 -62.9 Dark Down 58.9 136.8 Up 07:04:46 - 07:34:46 4523
Okanagan Falls 07:19:46 -63.1 Dark Down 59.0 136.6 Up 07:04:46 - 07:34:46 4505
Oliver 07:19:46 -63.2 Dark Down 59.2 136.4 Up 07:04:46 - 07:34:46 4488
Anarchist Mountain Observatory 07:19:46 -63.4 Dark Down 59.4 136.5 Up 07:04:46 - 07:34:46 4470
Oroville 07:19:46 -63.5 Dark Down 59.4 136.3 Up 07:04:46 - 07:34:46 4463
Tonasket 07:19:46 -63.7 Dark Down 59.6 136.1 Up 07:04:46 - 07:34:46 4439
Okanogan 07:19:46 -64.0 Dark Down 59.8 135.4 Up 07:04:46 - 07:34:46 4406
Brewster 07:19:46 -64.2 Dark Down 59.8 134.8 Up 07:04:46 - 07:34:46 4380
Manson/Chelan 07:19:46 -64.3 Dark Down 59.8 134.0 Up 07:04:46 - 07:34:46 4362
Entiat 07:19:46 -64.5 Dark Down 59.9 133.6 Up 07:04:46 - 07:34:46 4340
Wenatchee 07:19:46 -64.7 Dark Down 60.1 133.1 Up 07:04:46 - 07:34:46 4315
Ellensburg 07:19:56 -65.0 Dark Down 60.3 132.3 Up 07:04:56 - 07:34:56 4267
Yakima 07:19:57 -65.4 Dark Down 60.5 131.7 Up 07:04:57 - 07:34:57 4226
Toppenish/White Swan 07:19:56 -65.6 Dark Down 60.7 131.7 Up 07:04:56 - 07:34:56 4203
Pasco 07:19:46 -66.1 Dark Down 61.5 133.5 Up 07:04:46 - 07:34:46 4188
PNWRO 07:19:46 -66.4 Dark Down 61.7 133.5 Up 07:04:46 - 07:34:46 4162
George/Umatilla 07:19:46 -66.3 Dark Down 61.6 132.7 Up 07:04:46 - 07:34:46 4156
Goldendale 07:19:58 -66.0 Dark Down 60.9 130.3 Up 07:04:58 - 07:34:58 4147
The Dalles 07:19:59 -66.1 Dark Down 60.8 129.5 Up 07:04:59 - 07:34:59 4126
Maupin 07:19:59 -66.5 Dark Down 61.2 129.0 Up 07:04:59 - 07:34:59 4082
Madras/Culver 07:20:00 -67.0 Dark Down 61.5 128.2 Up 07:05:00 - 07:35:00 4025
Sisters 07:20:01 -67.2 Dark Down 61.4 127.1 Up 07:05:01 - 07:35:01 3993
Redmond 07:20:00 -67.3 Dark Down 61.7 127.6 Up 07:05:00 - 07:35:00 3988
Bend 07:20:00 -67.5 Dark Down 61.7 127.1 Up 07:05:00 - 07:35:00 3966
Oregon Observatory 07:20:01 -67.6 Dark Down 61.8 126.6 Up 07:05:01 - 07:35:01 3949
La Pine/Gilchrist 07:20:02 -67.7 Dark Down 61.8 126.2 Up 07:05:02 - 07:35:02 3928
North Lake 07:20:00 -68.3 Dark Down 62.5 126.5 Up 07:05:00 - 07:35:00 3879
Paisley 07:19:59 -68.9 Dark Down 63.0 126.2 Up 07:04:59 - 07:34:59 3819
Chiloquin 07:20:04 -68.6 Dark Down 62.3 124.0 Up 07:05:04 - 07:35:04 3813
Klamath Falls 07:20:03 -68.9 Dark Down 62.5 123.6 Up 07:05:03 - 07:35:03 3776
Lakeview 07:20:00 -69.5 Dark Down 63.4 125.6 Up 07:05:00 - 07:35:00 3765
Tulelake 07:20:03 -69.3 Dark Down 62.9 123.6 Up 07:05:03 - 07:35:03 3746
Cedarville 07:19:59 -70.1 Dark Down 63.9 124.8 Up 07:04:59 - 07:34:59 3694
Fall River/Burney 07:20:03 -70.1 Dark Down 63.4 122.2 Up 07:05:03 - 07:35:03 3649
Susanville 07:20:01 -70.9 Dark Down 64.2 122.2 Up 07:05:01 - 07:35:01 3578
Greenville 07:20:02 -71.0 Dark Down 64.2 121.3 Up 07:05:02 - 07:35:02 3550
Gimple 07:20:02 -71.1 Dark Down 64.2 121.4 Up 07:05:02 - 07:35:02 3550
Niwot 07:19:11 -72.8 Dark Down 72.4 153.5 Up 07:04:11 - 07:34:11 3541
SwRI 07:19:11 -72.9 Dark Down 72.5 153.1 Up 07:04:11 - 07:34:11 3529
Quincy 07:20:02 -71.2 Dark Down 64.3 120.9 Up 07:05:02 - 07:35:02 3529
Portola 07:20:01 -71.5 Dark Down 64.6 121.4 Up 07:05:01 - 07:35:01 3513
Reno 07:19:59 -72.0 Dark Down 65.2 121.9 Up 07:04:59 - 07:34:59 3481
Carson City 07:19:59 -72.3 Dark Down 65.4 121.3 Up 07:04:59 - 07:34:59 3443
Yerington 07:19:58 -72.7 Dark Down 65.9 121.8 Up 07:04:58 - 07:34:58 3419
Gardnerville 07:19:59 -72.5 Dark Down 65.6 120.9 Up 07:04:59 - 07:34:59 3416
Hawthorne 07:19:56 -73.3 Dark Down 66.5 121.8 Up 07:04:56 - 07:34:56 3367
Tonopah 07:19:46 -74.2 Dark Down 67.7 123.0 Up 07:04:46 - 07:34:46 3315
Lee Vining 07:19:58 -73.6 Dark Down 66.5 119.9 Up 07:04:58 - 07:34:58 3308
Bishop 07:19:46 -74.4 Dark Down 67.2 119.7 Up 07:04:46 - 07:34:46 3251
Beatty 07:19:46 -75.4 Dark Down 68.6 121.4 Up 07:04:46 - 07:34:46 3187
Lone Pine 07:19:46 -75.2 Dark Down 67.8 118.6 Up 07:04:46 - 07:34:46 3166
Indian Springs 07:19:46 -76.0 Dark Down 69.5 122.5 Up 07:04:46 - 07:34:46 3147
Henderson 07:19:45 -76.7 Dark Down 70.3 122.5 Up 07:04:45 - 07:34:45 3087
CPSLO 07:20:05 -75.1 Dark Down 66.6 112.3 Up 07:05:05 - 07:35:05 3027
Searchlight/Boulder City 07:19:45 -77.3 Dark Down 70.6 121.2 Up 07:04:45 - 07:34:45 3025
Patrick 07:19:41 -77.6 Dark Down 71.4 123.0 Up 07:04:41 - 07:34:41 3018
Kingman/Dolan Springs 07:19:42 -77.8 Dark Down 71.4 122.1 Up 07:04:42 - 07:34:42 2993
Laughlin/Bullhead City 07:19:44 -77.7 Dark Down 71.0 121.1 Up 07:04:44 - 07:34:44 2992
DCO 07:19:39 -78.0 Dark Down 72.0 123.6 Up 07:04:39 - 07:34:39 2984
Mohave Valley 07:19:44 -77.9 Dark Down 71.1 120.4 Up 07:04:44 - 07:34:44 2962
Lake Havasu City 07:19:43 -78.4 Dark Down 71.5 119.8 Up 07:04:43 - 07:34:43 2918
Wildwood 07:19:58 -77.1 Dark Down 68.6 112.3 Up 07:04:58 - 07:34:58 2885
Parker 07:19:43 -78.7 Dark Down 71.7 119.0 Up 07:04:43 - 07:34:43 2879
Idyllwild 07:19:46 -78.2 Dark Down 70.1 114.0 Up 07:04:46 - 07:34:46 2844
Blythe 07:19:44 -79.1 Dark Down 71.7 117.1 Up 07:04:44 - 07:34:44 2822
Calipatria 07:19:46 -79.2 Dark Down 71.3 114.2 Up 07:04:46 - 07:34:46 2770
Yuma 07:19:45 -80.0 Dark Down 72.1 114.4 Up 07:04:45 - 07:34:45 2721

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, (2022/12/23 07:19UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:18.0 +28:01:33  1.1 10.97 156
Alhena         06:37:42.8 +16:23:57  1.9  9.22 166
42Ome Gem      07:02:24.8 +24:12:55  5.2  0.63 165
PPM 096887     07:00:52.9 +24:28:51  8.5  0.52 166
PPM 096907     07:01:29.5 +24:14:46  9.9  0.45 166
98WY31         06:59:47.4 +24:01:38 14.7       166
Positions are for J2000

Event circumstances last updated at 2019/05/13 22:52:12 UT

Marc W. Buie, Southwest Research Institute

RECON