RECON: TNO occultation with 15807

Event between (15807) 94GV9 and star GA0780:04445509 with event index number of 1105411

Geocentric closest approach at 2022/05/03 02:32:28 UTC

J2000 position of star is 13:51:03.3 -11:04:51
Equinox of date position of star is 13:52:14.4 -11:11:24
Stellar brightness G=16.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 142 degrees from the moon. Moon is 5% illuminated.
TNO apparent brightness V=23.7

TNO is 43.5 AU from the Sun and 42.5 AU from the Earth.
The TNO is moving 24.4 km/sec on the sky relative to the star, or, 2.9 arcsec/hr.
The 1-sigma error in the time of the event is 334 seconds.
The 1-sigma cross-track error in the shadow position is 4221 km.

The TNO has an absolute magnitude Hv=7.3
Diameter=207.0 km assuming a 5% albedo -- 8.5 sec chord
Diameter=84.5 km assuming a 30% albedo -- 3.5 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 15807, (2022/05/03 02:32UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:22.4 -11:16:38  1.0  6.34 136
PPM 196876     13:48:24.4 -09:49:14  6.2  1.66 140
PPM 227966     13:54:05.1 -10:47:32  7.9  0.60 142
PPM 227945     13:53:20.5 -11:02:55  9.5  0.30 142
15807          13:52:14.8 -11:11:26 16.9       142
Positions are for equinox of date

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 15807, (2022/05/03 02:32UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0  6.34 136
PPM 196876     13:47:13.4 -09:42:35  6.2  1.66 140
PPM 227966     13:52:53.7 -10:40:58  7.9  0.60 142
PPM 227945     13:52:09.1 -10:56:20  9.5  0.30 142
15807          13:51:03.3 -11:04:51 16.9       142
Positions are for J2000

Event circumstances last updated at 2022/03/15 01:01:36 UT

Marc W. Buie, Southwest Research Institute

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