RECON: TNO occultation with 524834

Event between (524834) 03YL179 and star GA1120:02238445 with event index number of 2217612

Geocentric closest approach at 2021/11/03 17:35:04 UTC

J2000 position of star is 06:33:12.7 +22:35:05
Equinox of date position of star is 06:34:31.6 +22:34:01
Stellar brightness G=16.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 108 degrees from the moon. Moon is 2% illuminated.
TNO apparent brightness V=23.3

TNO is 38.7 AU from the Sun and 38.2 AU from the Earth.
The TNO is moving 12.2 km/sec on the sky relative to the star, or, 1.6 arcsec/hr.
The 1-sigma error in the time of the event is 1002 seconds.
The 1-sigma cross-track error in the shadow position is 4755 km.

The TNO has an absolute magnitude Hv=7.3
Diameter=208.9 km assuming a 5% albedo -- 17.1 sec chord
Diameter=85.3 km assuming a 30% albedo -- 7.0 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 524834, (2021/11/03 17:35UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:39.0 +27:58:18  1.1 17.16  92
Alhena         06:38:58.4 +16:22:44  1.9  6.28 107
PPM 096308     06:40:24.1 +22:00:35  6.0  1.47 106
PPM 096079     06:31:41.0 +22:31:42  7.2  0.66 108
PPM 096174     06:35:16.3 +22:19:17  8.8  0.30 108
PPM 096145     06:34:27.3 +22:40:46 11.3  0.11 108
524834         06:34:31.8 +22:34:00 16.5       108
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 524834, (2021/11/03 17:35UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1 17.16  92
Alhena         06:37:42.8 +16:23:57  1.9  6.28 107
PPM 096308     06:39:05.3 +22:01:51  6.0  1.47 106
PPM 096079     06:30:21.9 +22:32:41  7.2  0.66 108
PPM 096174     06:33:57.3 +22:20:23  8.8  0.30 108
PPM 096145     06:33:08.1 +22:41:50 11.3  0.11 108
524834         06:33:12.7 +22:35:05 16.5       108
Positions are for J2000

Event circumstances last updated at 2021/10/11 01:42:10 UT

Marc W. Buie, Southwest Research Institute

RECON