RECON: TNO occultation with 11JY31

Event between 11JY31 and star GA0700:33172394 with event index number of 1122540

Geocentric closest approach at 2021/03/19 04:15:21 UTC

J2000 position of star is 19:28:00.0 -19:41:07
Equinox of date position of star is 19:29:14.0 -19:38:28
Stellar brightness G=15.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 132 degrees from the moon. Moon is 28% illuminated.
TNO apparent brightness V=25.2

TNO is 42.3 AU from the Sun and 42.7 AU from the Earth.
The TNO is moving 16.4 km/sec on the sky relative to the star, or, 1.9 arcsec/hr.
The 1-sigma error in the time of the event is 724 seconds.
The 1-sigma cross-track error in the shadow position is 4055 km.

The TNO has an absolute magnitude Hv=8.8
Diameter=103.8 km assuming a 5% albedo -- 6.3 sec chord
Diameter=42.4 km assuming a 30% albedo -- 2.6 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 11JY31, (2021/03/19 04:15UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:42.7 -26:28:38  0.9 41.43 171
Nunki          18:56:34.7 -26:16:07  2.0 10.02 140
45Rho2Sgr      19:23:05.1 -18:16:03  5.8  2.00 133
PPM 236018     19:29:17.7 -19:17:54  8.1  0.34 131
PPM 236033     19:30:00.5 -19:40:45  8.9  0.18 131
11JY31         19:29:14.6 -19:38:26 15.6       131
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 11JY31, (2021/03/19 04:15UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 41.43 171
Nunki          18:55:15.9 -26:17:49  2.0 10.02 140
45Rho2Sgr      19:21:51.1 -18:18:32  5.8  2.00 133
PPM 236018     19:28:03.3 -19:20:34  8.1  0.34 131
PPM 236033     19:28:45.9 -19:43:27  8.9  0.18 131
11JY31         19:28:00.0 -19:41:07 15.6       132
Positions are for J2000

Event circumstances last updated at 2021/01/19 21:17:54 UT

Marc W. Buie, Southwest Research Institute

RECON