RECON: TNO occultation with 500835

Event between (500835) 13GN137 and star GA0740:05261686 with event index number of 1169096

Geocentric closest approach at 2021/03/20 12:21:10 UTC

J2000 position of star is 14:45:15.4 -14:29:56
Equinox of date position of star is 14:46:25.0 -14:35:13
Stellar brightness G=15.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 145 degrees from the moon. Moon is 40% illuminated.
TNO apparent brightness V=23.3

[RECON map]
TNO is 42.0 AU from the Sun and 41.3 AU from the Earth.
The TNO is moving 16.7 km/sec on the sky relative to the star, or, 2.0 arcsec/hr.
The 1-sigma error in the time of the event is 219 seconds.
The 1-sigma cross-track error in the shadow position is 2053 km.
The sky-plane scale is 29961.5 km/arcsec.

The TNO has an absolute magnitude Hv=7.0
Diameter=239.9 km assuming a 5% albedo -- 14.4 sec chord
Diameter=97.9 km assuming a 30% albedo -- 5.9 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 500835, (2021/03/20 12:21UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:18.8 -11:16:17  1.0 19.79 126
27Bet Lib      15:18:09.1 -09:27:36  2.6  9.30 150
5 Lib          14:47:08.2 -15:32:52  6.5  0.98 146
PPM 229225     14:46:01.5 -14:26:54  9.1  0.17 145
500835         14:46:25.5 -14:35:15 15.7       146
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 4.1 sigma about the mid-time.
The median site spacing is 12.8 km RECON observability=1.0 and success probability=0.1%
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 12:21:26 -16.1 AT Down 22.2 204.1 Low 12:06:26 - 12:36:26 9118
Kelowna 12:21:26 -16.4 AT Down 22.6 204.0 Low 12:06:26 - 12:36:26 9102
Peachland 12:21:26 -16.6 AT Down 22.7 203.7 Low 12:06:26 - 12:36:26 9094
Summerland 12:21:24 -16.6 AT Down 22.9 203.8 Low 12:06:24 - 12:36:24 9089
Penticton 12:21:25 -16.5 AT Down 22.9 204.0 Low 12:06:25 - 12:36:25 9088
Oliver 12:21:24 -16.6 AT Down 23.2 204.0 Low 12:06:24 - 12:36:24 9075
Anarchist Mountain Observatory 12:21:21 -16.6 AT Down 23.3 204.2 Low 12:06:21 - 12:36:21 9072
Tonasket 12:21:21 -16.7 AT Down 23.6 204.2 Low 12:06:21 - 12:36:21 9058
Okanogan 12:21:23 -17.0 AT Down 24.0 204.1 Low 12:06:23 - 12:36:23 9043
Brewster 12:21:23 -17.2 AT Down 24.3 204.0 Low 12:06:23 - 12:36:23 9029
Manson/Chelan 12:21:23 -17.5 AT Down 24.6 203.6 Low 12:06:23 - 12:36:23 9015
Wenatchee 12:21:21 -17.8 AT Down 25.0 203.5 Low 12:06:21 - 12:36:21 8993
Victoria 12:21:38 -19.2 Dark Down 24.8 200.2 Low 12:06:38 - 12:36:38 8990
Ellensburg 12:21:23 -18.0 Dark Down 25.5 203.4 Low 12:06:23 - 12:36:23 8972
Pasco 12:21:14 -17.4 AT Down 25.8 205.0 Low 12:06:14 - 12:36:14 8962
PNWRO 12:21:12 -17.3 AT Down 25.9 205.3 Low 12:06:12 - 12:36:12 8955
Yakima 12:21:23 -18.2 Dark Down 25.9 203.5 Low 12:06:23 - 12:36:23 8955
Toppenish/White Swan 12:21:20 -18.2 Dark Down 26.0 203.7 Low 12:06:20 - 12:36:20 8948
Goldendale 12:21:20 -18.6 Dark Down 26.6 203.3 Low 12:06:20 - 12:36:20 8917
The Dalles 12:21:19 -18.9 Dark Down 26.9 203.0 Low 12:06:19 - 12:36:19 8901
Maupin 12:21:19 -19.0 Dark Down 27.3 203.2 Low 12:06:19 - 12:36:19 8884
Dunrhomin 12:19:58 -9.1 NT Down 25.5 219.9 Low 12:04:58 - 12:34:58 8854
Redmond 12:21:18 -19.4 Dark Down 28.2 203.3 Low 12:06:18 - 12:36:18 8841
Sisters 12:21:18 -19.7 Dark Down 28.3 202.9 Low 12:06:18 - 12:36:18 8835
Bend 12:21:16 -19.6 Dark Down 28.4 203.2 Low 12:06:16 - 12:36:16 8828
Oregon Observatory 12:21:18 -19.7 Dark Down 28.6 203.1 Low 12:06:18 - 12:36:18 8818
La Pine/Gilchrist 12:21:16 -19.8 Dark Down 28.8 203.0 Low 12:06:16 - 12:36:16 8807
North Lake 12:21:14 -19.6 Dark Down 29.0 203.8 Low 12:06:14 - 12:36:14 8796
Paisley 12:21:11 -19.5 Dark Down 29.4 204.3 Low 12:06:11 - 12:36:11 8775
Lakeview 12:21:07 -19.6 Dark Down 29.8 204.6 Low 12:06:07 - 12:36:07 8753
Klamath Falls 12:21:14 -20.5 Dark Down 30.2 203.1 Up 12:06:14 - 12:36:14 8730
Cedarville 12:21:05 -19.7 Dark Down 30.4 204.9 Up 12:06:05 - 12:36:05 8722
Fall River/Burney 12:21:09 -20.7 Dark Down 31.2 203.7 Up 12:06:09 - 12:36:09 8676
Susanville 12:21:04 -20.4 Dark Down 31.6 204.7 Up 12:06:04 - 12:36:04 8655
Gimple 12:21:04 -20.6 Dark Down 31.9 204.5 Up 12:06:04 - 12:36:04 8636
Greenville 12:21:05 -20.7 Dark Down 31.9 204.4 Up 12:06:05 - 12:36:05 8635
Portola 12:21:03 -20.4 Dark Down 32.0 205.0 Up 12:06:03 - 12:36:03 8626
Quincy 12:21:04 -20.7 Dark Down 32.1 204.5 Up 12:06:04 - 12:36:04 8624
Reno 12:20:58 -20.0 Dark Down 32.1 205.8 Up 12:05:58 - 12:35:58 8622
Carson City 12:20:58 -20.1 Dark Down 32.4 205.9 Up 12:05:58 - 12:35:58 8603
Yerington 12:20:53 -19.7 Dark Down 32.4 206.6 Up 12:05:53 - 12:35:53 8603
Gardnerville 12:20:55 -20.2 Dark Down 32.6 206.0 Up 12:05:55 - 12:35:55 8590
Hawthorne 12:20:50 -19.5 Dark Down 32.6 207.3 Up 12:05:50 - 12:35:50 8586
Tonopah 12:20:41 -18.6 Dark Down 32.5 208.9 Up 12:05:41 - 12:35:41 8583
Lee Vining 12:20:51 -20.0 Dark Down 33.3 206.9 Up 12:05:51 - 12:35:51 8546
Bishop 12:20:45 -19.6 Dark Down 33.5 207.9 Up 12:05:45 - 12:35:45 8524
Beatty 12:20:36 -18.5 Dark Down 33.3 209.7 Up 12:05:36 - 12:35:36 8523
Indian Springs 12:20:30 -17.8 AT Down 33.2 210.9 Up 12:05:30 - 12:35:30 8521
Henderson 12:20:25 -17.4 AT Down 33.4 211.8 Up 12:05:25 - 12:35:25 8500
Patrick 12:20:19 -16.7 AT Down 33.4 213.2 Up 12:05:19 - 12:35:19 8480
Kingman/Dolan Springs 12:20:18 -16.9 AT Down 33.7 213.1 Up 12:05:18 - 12:35:18 8464
Laughlin/Bullhead City 12:20:22 -17.3 AT Down 33.9 212.6 Up 12:05:22 - 12:35:22 8454
Mohave Valley 12:20:20 -17.3 AT Down 34.2 212.6 Up 12:05:20 - 12:35:20 8437
Lake Havasu City 12:20:20 -17.2 AT Down 34.4 213.1 Up 12:05:20 - 12:35:20 8417
George/Scottsdale 12:20:04 -15.4 AT Down 33.9 215.8 Up 12:05:04 - 12:35:04 8405
Parker 12:20:16 -17.3 AT Down 34.7 213.2 Up 12:05:16 - 12:35:16 8395
CPSLO 12:20:51 -22.0 Dark Down 36.2 206.1 Up 12:05:51 - 12:35:51 8359
Blythe 12:20:18 -17.6 AT Down 35.2 213.1 Up 12:05:18 - 12:35:18 8358
Idyllwild 12:20:28 -19.3 Dark Down 36.1 210.8 Up 12:05:28 - 12:35:28 8332
Wildwood 12:20:39 -20.7 Dark Down 36.5 208.7 Up 12:05:39 - 12:35:39 8321
Calipatria 12:20:20 -18.5 Dark Down 36.1 212.3 Up 12:05:20 - 12:35:20 8311
Yuma 12:20:14 -17.9 AT Down 36.0 213.4 Up 12:05:14 - 12:35:14 8298

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 500835, (2021/03/20 12:21UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 19.79 126
27Bet Lib      15:17:00.3 -09:22:59  2.6  9.30 150
5 Lib          14:45:57.7 -15:27:34  6.5  0.98 146
PPM 229225     14:44:51.4 -14:21:35  9.1  0.17 145
500835         14:45:15.4 -14:29:56 15.7       145
Positions are for J2000

Event circumstances last updated at 2021/01/19 21:20:05 UT

Marc W. Buie, Southwest Research Institute

RECON