RECON: TNO occultation with 385437

Event between (385437) 03GH55 and star GA0700:05922785 with event index number of 2374652

Geocentric closest approach at 2022/09/11 08:58:55 UTC

J2000 position of star is 15:44:00.1 -18:49:44
Equinox of date position of star is 15:45:15.4 -18:53:47
Stellar brightness G=16.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 123 degrees from the moon. Moon is 99% illuminated.
TNO apparent brightness V=22.3

TNO is 41.2 AU from the Sun and 41.6 AU from the Earth.
The TNO is moving 15.5 km/sec on the sky relative to the star, or, 1.8 arcsec/hr.
The 1-sigma error in the time of the event is 160 seconds.
The 1-sigma cross-track error in the shadow position is 1582 km.

The TNO has an absolute magnitude Hv=6.0
Diameter=382.0 km assuming a 5% albedo -- 24.7 sec chord
Diameter=155.9 km assuming a 30% albedo -- 10.1 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 385437, (2022/09/11 08:59UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:48.2 -26:28:49  0.9 12.93 111
8Bet1Sco       16:06:45.6 -19:51:57  2.6  5.15 118
43Kap Lib      15:43:15.5 -19:45:03  4.7  0.98 123
PPM 230627     15:43:56.4 -18:40:41  7.9  0.39 124
PPM 230686     15:46:11.6 -18:49:16  9.5  0.22 123
PPM 230665     15:45:21.1 -18:59:58 10.1  0.10 123
385437         15:45:18.5 -18:53:57 16.7       123
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 385437, (2022/09/11 08:59UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 12.93 111
8Bet1Sco       16:05:26.2 -19:48:20  2.6  5.15 118
43Kap Lib      15:41:56.7 -19:40:46  4.7  0.98 123
PPM 230627     15:42:38.1 -18:36:26  7.9  0.39 124
PPM 230686     15:44:53.2 -18:45:04  9.5  0.22 123
PPM 230665     15:44:02.6 -18:55:45 10.1  0.10 123
385437         15:44:00.1 -18:49:44 16.7       123
Positions are for J2000

Event circumstances last updated at 2021/10/14 01:45:43 UT

Marc W. Buie, Southwest Research Institute

RECON