RECON: TNO occultation with 139775

Event between (139775) 01QG298 and star GA0980:00228117 with event index number of 1295435

Geocentric closest approach at 2023/09/09 08:49:40 UTC

J2000 position of star is 02:40:19.2 +09:47:06
Equinox of date position of star is 02:41:32.7 +09:52:55
Stellar brightness G=13.4, use SENSEUP=32 with the MallinCam and and exposure time of 500 milli-seconds with the QHY174 camera.
Star is 64 degrees from the moon. Moon is 27% illuminated.
TNO apparent brightness V=22.1

[RECON map]
TNO is 32.4 AU from the Sun and 31.8 AU from the Earth.
The TNO is moving 12.1 km/sec on the sky relative to the star, or, 1.9 arcsec/hr.
The 1-sigma error in the time of the event is 118 seconds.
The 1-sigma cross-track error in the shadow position is 1277 km.
The sky-plane scale is 23045.8 km/arcsec.

The TNO has an absolute magnitude Hv=6.9
Diameter=253.5 km assuming a 5% albedo -- 20.4 sec chord
Diameter=103.5 km assuming a 30% albedo -- 8.3 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 139775, (2023/09/09 08:51UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:17.0 +16:33:18  0.8 28.90  36
Menkar         03:03:31.2 +04:10:53  2.5  7.88  62
PPM 118474     02:43:45.7 +10:50:29  6.3  1.09  63
PPM 118463     02:43:16.8 +10:38:40  7.7  0.86  63
PPM 145803     02:41:52.9 +09:36:15 10.0  0.29  64
PPM 145813     02:42:30.5 +09:52:12 10.1  0.23  64
139775         02:41:35.6 +09:53:09 13.4        64
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 13.9 km RECON observability=1.0 and success probability=1.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Victoria 08:50:19 -35.4 Dark Up 37.3 122.7 Up 08:39:59 - 09:00:38 5420
Kamloops 08:49:53 -32.9 Dark Up 37.7 127.1 Up 08:39:33 - 09:00:12 5410
Peachland 08:49:57 -33.7 Dark Up 38.5 127.2 Up 08:39:37 - 09:00:16 5350
Kelowna 08:49:55 -33.5 Dark Up 38.6 127.6 Up 08:39:36 - 09:00:15 5344
Summerland 08:49:57 -33.8 Dark Up 38.7 127.2 Up 08:39:38 - 09:00:17 5340
Penticton 08:49:58 -33.9 Dark Up 38.8 127.3 Up 08:39:38 - 09:00:17 5333
Oliver 08:49:59 -34.2 Dark Up 39.0 127.1 Up 08:39:40 - 09:00:19 5317
Anarchist Mountain Observatory 08:50:01 -34.3 Dark Up 39.2 127.2 Up 08:39:41 - 09:00:20 5303
Tonasket 08:50:03 -34.6 Dark Up 39.4 126.9 Up 08:39:44 - 09:00:23 5290
Okanogan 08:50:06 -35.0 Dark Up 39.5 126.5 Up 08:39:47 - 09:00:26 5280
Manson/Chelan 08:50:11 -35.5 Dark Up 39.5 125.6 Up 08:39:51 - 09:00:30 5278
Brewster 08:50:08 -35.3 Dark Up 39.5 126.2 Up 08:39:49 - 09:00:28 5274
Wenatchee 08:50:16 -36.0 Dark Up 39.7 125.2 Up 08:39:56 - 09:00:35 5261
Ellensburg 08:50:20 -36.5 Dark Up 39.8 124.7 Up 08:40:00 - 09:00:39 5249
Yakima 08:50:23 -36.9 Dark Up 40.0 124.4 Up 08:40:03 - 09:00:42 5230
Toppenish/White Swan 08:50:24 -37.0 Dark Up 40.2 124.4 Up 08:40:04 - 09:00:43 5213
The Dalles 08:50:32 -37.9 Dark Up 40.2 123.1 Up 08:40:13 - 09:00:52 5203
Goldendale 08:50:29 -37.6 Dark Up 40.3 123.6 Up 08:40:10 - 09:00:49 5202
Maupin 08:50:35 -38.3 Dark Up 40.5 122.9 Up 08:40:15 - 09:00:54 5179
Sisters 08:50:43 -39.2 Dark Up 40.7 121.8 Up 08:40:23 - 09:01:02 5152
PNWRO 08:50:20 -37.1 Dark Up 41.3 125.7 Up 08:40:01 - 09:00:40 5140
Bend 08:50:43 -39.4 Dark Up 41.0 121.9 Up 08:40:24 - 09:01:03 5130
Oregon Observatory 08:50:46 -39.6 Dark Up 41.0 121.6 Up 08:40:26 - 09:01:05 5126
Chiloquin 08:50:56 -40.9 Dark Up 41.5 120.3 Up 08:40:37 - 09:01:16 5072
North Lake 08:50:48 -40.1 Dark Up 41.7 121.7 Up 08:40:29 - 09:01:08 5072
Klamath Falls 08:50:58 -41.3 Dark Up 41.7 120.1 Up 08:40:39 - 09:01:18 5050
Lakeview 08:50:53 -41.0 Dark Up 42.6 121.5 Up 08:40:34 - 09:01:13 4993
Sleaford 08:48:48 -28.2 Dark Up 42.8 144.4 Up 08:38:28 - 08:59:07 4979
Fall River/Burney 08:51:06 -42.3 Dark Up 42.6 119.6 Up 08:40:46 - 09:01:25 4970
Cedarville 08:50:58 -41.6 Dark Up 43.1 121.2 Up 08:40:38 - 09:01:17 4949
Susanville 08:51:07 -42.8 Dark Up 43.4 119.8 Up 08:40:47 - 09:01:26 4904
Greenville 08:51:10 -43.1 Dark Up 43.3 119.3 Up 08:40:51 - 09:01:30 4900
Gimple 08:51:09 -43.1 Dark Up 43.4 119.4 Up 08:40:50 - 09:01:29 4897
Quincy 08:51:11 -43.3 Dark Up 43.4 119.1 Up 08:40:52 - 09:01:31 4888
Portola 08:51:10 -43.3 Dark Up 43.8 119.5 Up 08:40:51 - 09:01:30 4862
Reno 08:51:10 -43.4 Dark Up 44.4 119.9 Up 08:40:51 - 09:01:30 4819
Carson City 08:51:12 -43.7 Dark Up 44.6 119.7 Up 08:40:52 - 09:01:31 4797
Gardnerville 08:51:13 -43.9 Dark Up 44.7 119.5 Up 08:40:53 - 09:01:32 4780
Yerington 08:51:10 -43.7 Dark Up 45.1 120.1 Up 08:40:51 - 09:01:30 4759
Hawthorne 08:51:12 -44.0 Dark Up 45.7 120.3 Up 08:40:52 - 09:01:31 4708
Lee Vining 08:51:18 -44.7 Dark Up 45.6 119.3 Up 08:40:59 - 09:01:38 4695
Bishop 08:51:18 -45.0 Dark Up 46.4 119.5 Up 08:40:59 - 09:01:38 4626
Tonopah 08:51:08 -44.0 Dark Up 46.9 121.3 Up 08:40:48 - 09:01:27 4620
Beatty 08:51:14 -45.0 Dark Up 47.8 120.7 Up 08:40:54 - 09:01:33 4526
Indian Springs 08:51:10 -44.9 Dark Up 48.7 121.6 Up 08:40:51 - 09:01:30 4457
Wildwood 08:51:41 -48.1 Dark Up 47.9 116.3 Up 08:41:21 - 09:02:00 4421
Henderson 08:51:11 -45.1 Dark Up 49.4 121.8 Up 08:40:52 - 09:01:31 4391
Laughlin/Bullhead City 08:51:15 -45.8 Dark Up 50.2 121.4 Up 08:40:56 - 09:01:35 4314
Idyllwild 08:51:34 -47.8 Dark Up 49.4 117.7 Up 08:41:15 - 09:01:54 4312
Patrick 08:51:09 -45.3 Dark Up 50.5 122.4 Up 08:40:50 - 09:01:29 4299
Mohave Valley 08:51:17 -46.0 Dark Up 50.3 121.1 Up 08:40:58 - 09:01:37 4295
Kingman/Dolan Springs 08:51:13 -45.5 Dark Up 50.5 122.0 Up 08:40:53 - 09:01:32 4293
Lake Havasu City 08:51:17 -46.2 Dark Up 50.7 121.0 Up 08:40:58 - 09:01:37 4256
Dunrhomin 08:49:56 -37.7 Dark Up 52.5 137.6 Up 08:39:36 - 09:00:15 4244
CU-SBO 08:49:57 -37.9 Dark Up 52.7 137.2 Up 08:39:38 - 09:00:17 4231
Parker 08:51:19 -46.5 Dark Up 50.9 120.6 Up 08:41:00 - 09:01:39 4230
Calipatria 08:51:33 -47.9 Dark Up 50.6 118.3 Up 08:41:13 - 09:01:52 4215
Yuma 08:51:31 -47.9 Dark Up 51.4 118.8 Up 08:41:11 - 09:01:50 4144
George/Scottsdale 08:51:10 -45.9 Dark Up 52.9 122.9 Up 08:40:51 - 09:01:30 4089

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 139775, (2023/09/09 08:51UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 28.90  36
Menkar         03:02:16.8 +04:05:21  2.5  7.88  62
PPM 118474     02:42:28.9 +10:44:29  6.3  1.09  63
PPM 118463     02:42:00.1 +10:32:40  7.7  0.86  63
PPM 145803     02:40:36.6 +09:30:13 10.0  0.29  64
PPM 145813     02:41:14.1 +09:46:11 10.1  0.23  64
139775         02:40:19.2 +09:47:06 13.4        64
Positions are for J2000

Event circumstances last updated at 2022/10/10 04:17:51 UT

Marc W. Buie, Southwest Research Institute

RECON