RECON: TNO occultation with 523790

Event between (523790) 15HP9 and star GA0700:06516354 with event index number of 1151969

Geocentric closest approach at 2021/04/09 21:13:57 UTC

J2000 position of star is 16:31:55.8 -18:46:10
Equinox of date position of star is 16:33:09.6 -18:48:47
Stellar brightness G=15.1, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 106 degrees from the moon. Moon is 5% illuminated.
TNO apparent brightness V=22.5

TNO is 15.4 AU from the Sun and 14.7 AU from the Earth.
The TNO is moving 11.3 km/sec on the sky relative to the star, or, 3.8 arcsec/hr.
The 1-sigma error in the time of the event is 177 seconds.
The 1-sigma cross-track error in the shadow position is 713 km.

The TNO has an absolute magnitude Hv=10.4
Diameter=50.1 km assuming a 5% albedo -- 4.5 sec chord
Diameter=20.5 km assuming a 30% albedo -- 1.8 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 523790, (2021/04/09 21:14UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:42.9 -26:28:39  0.9  7.68 105
8Bet1Sco       16:06:40.6 -19:51:43  2.6  6.34 112
7Chi Oph       16:28:15.6 -18:30:10  4.1  1.20 108
PPM 231759     16:30:57.7 -18:43:39  8.1  0.53 107
PPM 231792     16:32:17.6 -18:39:56  9.8  0.25 107
523790         16:33:10.2 -18:48:48 15.1       106
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, (2021/04/09 21:14UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  7.68 105
8Bet1Sco       16:05:26.2 -19:48:20  2.6  6.34 112
7Chi Oph       16:27:01.4 -18:27:23  4.1  1.20 108
PPM 231759     16:29:43.4 -18:40:56  8.1  0.53 107
PPM 231792     16:31:03.3 -18:37:16  9.8  0.25 107
523790         16:31:55.8 -18:46:10 15.1       106
Positions are for J2000

Event circumstances last updated at 2021/02/06 20:52:27 UT

Marc W. Buie, Southwest Research Institute

RECON