RECON: TNO occultation with 523790

Event between (523790) 15HP9 and star GA0700:06373924 with event index number of 1151987

Geocentric closest approach at 2021/06/06 19:27:00 UTC

J2000 position of star is 16:21:46.7 -18:19:51
Equinox of date position of star is 16:23:00.1 -18:22:46
Stellar brightness G=16.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 150 degrees from the moon. Moon is 12% illuminated.
TNO apparent brightness V=22.2

TNO is 15.5 AU from the Sun and 14.5 AU from the Earth.
The TNO is moving 21.1 km/sec on the sky relative to the star, or, 7.2 arcsec/hr.
The 1-sigma error in the time of the event is 87 seconds.
The 1-sigma cross-track error in the shadow position is 728 km.

The TNO has an absolute magnitude Hv=10.4
Diameter=50.1 km assuming a 5% albedo -- 2.4 sec chord
Diameter=20.5 km assuming a 30% albedo -- 1.0 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 523790, (2021/06/06 19:27UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:43.5 -26:28:40  0.9  8.29 146
8Bet1Sco       16:06:41.2 -19:51:45  2.6  4.13 153
7Chi Oph       16:28:16.1 -18:30:11  4.1  1.25 149
PPM 231543     16:21:27.4 -18:27:46  8.5  0.38 150
PPM 231570     16:22:20.8 -18:16:11  9.5  0.19 150
523790         16:23:01.2 -18:22:48 16.7       150
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 523790, (2021/06/06 19:27UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  8.29 146
8Bet1Sco       16:05:26.2 -19:48:20  2.6  4.13 153
7Chi Oph       16:27:01.4 -18:27:23  4.1  1.25 149
PPM 231543     16:20:12.8 -18:24:46  8.5  0.38 150
PPM 231570     16:21:06.3 -18:13:13  9.5  0.19 150
523790         16:21:46.7 -18:19:51 16.7       150
Positions are for J2000

Event circumstances last updated at 2021/02/06 21:04:36 UT

Marc W. Buie, Southwest Research Institute

RECON