RECON: TNO occultation with 538691

Event between (538691) 16FW59 and star GA0780:04243551 with event index number of 1624440

Geocentric closest approach at 2021/02/15 06:48:26 UTC

J2000 position of star is 12:31:07.7 -10:13:21
Equinox of date position of star is 12:32:13.2 -10:20:18
Stellar brightness G=13.3, use SENSEUP=32 with the MallinCam and and exposure time of 500 milli-seconds with the QHY174 camera.
Star is 168 degrees from the moon. Moon is 12% illuminated.
TNO apparent brightness V=22.7

[RECON map]
TNO is 45.2 AU from the Sun and 44.5 AU from the Earth.
The TNO is moving 17.1 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 427 seconds.
The 1-sigma cross-track error in the shadow position is 5430 km.
The sky-plane scale is 32303.2 km/arcsec.

The TNO has an absolute magnitude Hv=6.1
Diameter=363.1 km assuming a 5% albedo -- 21.3 sec chord
Diameter=148.2 km assuming a 30% albedo -- 8.7 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 538691, (2021/02/15 06:48UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:18.5 -11:16:15  1.0 13.31 162
4Gam Crv       12:16:53.7 -17:39:33  2.6  8.21 161
21 Vir         12:34:52.3 -09:34:06  5.6  1.01 169
PPM 195560     12:31:44.2 -09:56:27  7.9  0.42 169
PPM 225960     12:32:47.6 -10:18:35  9.4  0.14 168
538691         12:32:13.4 -10:20:20 13.3       168
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 2.1 sigma about the mid-time.
The median site spacing is 26.8 km RECON observability=0.2 and success probability=3.7%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Clarence Fulton 06:53:04 -49.1 Dark Down 11.2 121.4 Really Low 06:38:04 - 07:08:04 -4688
Kelowna 06:53:04 -49.4 Dark Down 11.3 121.2 Really Low 06:38:04 - 07:08:04 -4721
Peachland 06:53:06 -49.4 Dark Down 11.2 120.9 Really Low 06:38:06 - 07:08:06 -4736
Summerland 06:53:06 -49.5 Dark Down 11.3 121.0 Really Low 06:38:06 - 07:08:06 -4746
Penticton 06:53:07 -49.6 Dark Down 11.4 121.1 Really Low 06:38:07 - 07:08:07 -4749
Oliver 06:53:07 -49.9 Dark Down 11.6 121.0 Really Low 06:38:07 - 07:08:07 -4777
Anarchist Mountain Observatory 06:53:08 -50.1 Dark Down 11.8 121.1 Really Low 06:38:08 - 07:08:08 -4787
Tonasket 06:53:08 -50.4 Dark Down 11.9 121.0 Really Low 06:38:08 - 07:08:08 -4813
Okanogan 06:53:09 -50.6 Dark Down 12.0 120.8 Really Low 06:38:09 - 07:08:09 -4844
Brewster 06:53:12 -50.8 Dark Down 12.1 120.6 Really Low 06:38:12 - 07:08:12 -4870
Manson/Chelan 06:53:12 -50.8 Dark Down 11.9 120.3 Really Low 06:38:12 - 07:08:12 -4895
Victoria 06:53:16 -49.1 Dark Down 9.7 117.8 Really Low 06:38:16 - 07:08:16 -4910
Wenatchee 06:53:15 -51.2 Dark Down 12.1 120.1 Really Low 06:38:15 - 07:08:15 -4937
Ellensburg 06:53:15 -51.4 Dark Down 12.2 119.8 Really Low 06:38:15 - 07:08:15 -4976
Pasco 06:53:14 -52.6 Dark Down 13.4 120.8 Really Low 06:38:14 - 07:08:14 -5007
Yakima 06:53:17 -51.8 Dark Down 12.4 119.7 Really Low 06:38:17 - 07:08:17 -5010
PNWRO 06:53:15 -52.9 Dark Down 13.7 121.0 Really Low 06:38:15 - 07:08:15 -5023
Toppenish/White Swan 06:53:17 -52.0 Dark Down 12.6 119.8 Really Low 06:38:17 - 07:08:17 -5025
Goldendale 06:53:20 -52.3 Dark Down 12.6 119.4 Really Low 06:38:20 - 07:08:20 -5080
The Dalles 06:53:21 -52.3 Dark Down 12.5 119.1 Really Low 06:38:21 - 07:08:21 -5107
Maupin 06:53:23 -52.7 Dark Down 12.8 119.1 Really Low 06:38:23 - 07:08:23 -5141
Dunrhomin 06:52:53 -61.9 Dark Down 25.1 130.7 Low 06:37:53 - 07:07:53 -5177
Redmond 06:53:24 -53.4 Dark Down 13.1 118.8 Really Low 06:38:24 - 07:08:24 -5220
Sisters 06:53:25 -53.2 Dark Down 12.9 118.5 Really Low 06:38:25 - 07:08:25 -5227
Bend 06:53:25 -53.5 Dark Down 13.2 118.7 Really Low 06:38:25 - 07:08:25 -5241
Oregon Observatory 06:53:26 -53.6 Dark Down 13.2 118.5 Really Low 06:38:26 - 07:08:26 -5259
La Pine/Gilchrist 06:53:27 -53.7 Dark Down 13.2 118.5 Really Low 06:38:27 - 07:08:27 -5279
North Lake 06:53:28 -54.4 Dark Down 13.8 118.8 Really Low 06:38:28 - 07:08:28 -5303
Paisley 06:53:27 -55.0 Dark Down 14.3 119.0 Really Low 06:38:27 - 07:08:27 -5343
Lakeview 06:53:30 -55.4 Dark Down 14.7 119.0 Really Low 06:38:30 - 07:08:30 -5383
Klamath Falls 06:53:31 -54.8 Dark Down 13.7 118.0 Really Low 06:38:31 - 07:08:31 -5413
Cedarville 06:53:30 -56.1 Dark Down 15.1 119.0 Really Low 06:38:30 - 07:08:30 -5437
Fall River/Burney 06:53:36 -55.9 Dark Down 14.6 118.0 Really Low 06:38:36 - 07:08:36 -5509
Susanville 06:53:34 -56.7 Dark Down 15.4 118.4 Really Low 06:38:34 - 07:08:34 -5548
Gimple 06:53:36 -56.8 Dark Down 15.3 118.2 Really Low 06:38:36 - 07:08:36 -5578
Greenville 06:53:34 -56.8 Dark Down 15.3 118.1 Really Low 06:38:34 - 07:08:34 -5580
Portola 06:53:34 -57.3 Dark Down 15.8 118.4 Really Low 06:38:34 - 07:08:34 -5598
Quincy 06:53:35 -56.9 Dark Down 15.4 118.1 Really Low 06:38:35 - 07:08:35 -5599
Reno 06:53:34 -57.8 Dark Down 16.3 118.8 Really Low 06:38:34 - 07:08:34 -5607
Carson City 06:53:35 -58.1 Dark Down 16.5 118.7 Really Low 06:38:35 - 07:08:35 -5639
Yerington 06:53:33 -58.5 Dark Down 17.0 119.1 Really Low 06:38:33 - 07:08:33 -5641
Gardnerville 06:53:36 -58.3 Dark Down 16.7 118.7 Really Low 06:38:36 - 07:08:36 -5660
Hawthorne 06:53:34 -59.2 Dark Down 17.6 119.4 Really Low 06:38:34 - 07:08:34 -5670
Tonopah 06:53:32 -60.2 Dark Down 18.8 120.3 Really Low 06:38:32 - 07:08:32 -5677
Lee Vining 06:53:35 -59.4 Dark Down 17.6 118.9 Really Low 06:38:35 - 07:08:35 -5734
Bishop 06:53:35 -60.2 Dark Down 18.4 119.3 Really Low 06:38:35 - 07:08:35 -5771
Beatty 06:53:32 -61.3 Dark Down 19.7 120.3 Really Low 06:38:32 - 07:08:32 -5772
Indian Springs 06:53:30 -62.1 Dark Down 20.6 121.0 Low 06:38:30 - 07:08:30 -5775
Henderson 06:53:29 -62.9 Dark Down 21.4 121.4 Low 06:38:29 - 07:08:29 -5806
Patrick 06:53:27 -63.9 Dark Down 22.5 122.0 Low 06:38:27 - 07:08:27 -5834
Kingman/Dolan Springs 06:53:29 -64.0 Dark Down 22.5 121.8 Low 06:38:29 - 07:08:29 -5860
Laughlin/Bullhead City 06:53:30 -63.8 Dark Down 22.1 121.4 Low 06:38:30 - 07:08:30 -5876
Mohave Valley 06:53:29 -64.0 Dark Down 22.3 121.3 Low 06:38:29 - 07:08:29 -5901
Lake Havasu City 06:53:29 -64.4 Dark Down 22.6 121.3 Low 06:38:29 - 07:08:29 -5932
George/Scottsdale 06:53:25 -66.2 Dark Down 24.8 122.9 Low 06:38:25 - 07:08:25 -5938
Parker 06:53:31 -64.8 Dark Down 22.9 121.2 Low 06:38:31 - 07:08:31 -5964
CPSLO 06:53:44 -60.5 Dark Down 17.8 117.1 Really Low 06:38:44 - 07:08:44 -6021
Blythe 06:53:32 -65.0 Dark Down 22.9 120.8 Low 06:38:32 - 07:08:32 -6022
Idyllwild 06:53:38 -63.9 Dark Down 21.4 119.4 Low 06:38:38 - 07:08:38 -6067
Wildwood 06:53:43 -62.6 Dark Down 19.8 118.1 Really Low 06:38:43 - 07:08:43 -6083
Calipatria 06:53:36 -65.0 Dark Down 22.5 120.0 Low 06:38:36 - 07:08:36 -6094
Yuma 06:53:33 -65.8 Dark Down 23.4 120.5 Low 06:38:33 - 07:08:33 -6110

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 538691, (2021/02/15 06:48UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 13.31 162
4Gam Crv       12:15:48.1 -17:32:30  2.6  8.21 161
21 Vir         12:33:46.6 -09:27:07  5.6  1.01 169
PPM 195560     12:30:38.5 -09:49:28  7.9  0.42 169
PPM 225960     12:31:41.9 -10:11:36  9.4  0.14 168
538691         12:31:07.7 -10:13:21 13.3       168
Positions are for J2000

Event circumstances last updated at 2021/01/18 21:34:45 UT

Marc W. Buie, Southwest Research Institute

RECON