RECON: TNO occultation with 535169

Event between (535169) 14XX40 and star GA0800:04277690 with event index number of 2259460

Geocentric closest approach at 2026/12/27 05:01:12 UTC

J2000 position of star is 12:46:38.8 -08:46:46
Equinox of date position of star is 12:47:54.6 -08:54:43
Stellar brightness G=15.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 55 degrees from the moon. Moon is 86% illuminated.
Apparent brightness V=22.7

Object is 33.3 AU from the Sun and 33.5 AU from the Earth.
Apparent velocity is 10.7 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 396 seconds.
The 1-sigma cross-track error in the shadow position is 1272 km.

The object has an absolute magnitude Hv=7.3
Diameter=204.2 km assuming a 5% albedo -- 19.3 sec chord
Diameter=83.4 km assuming a 30% albedo -- 7.9 sec chord
Dynamical classification is CENTAURS
 
 
 
 
 
 
 
 

Star training set for 535169, (2026/12/27 05:14UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:37.1 -11:18:05  1.0  9.78  64
40Psi Vir      12:55:45.6 -09:41:06  4.8  2.05  56
PPM 195839     12:48:30.5 -09:21:41  7.7  0.45  55
PPM 195837     12:48:26.2 -08:46:42  9.5  0.18  54
535169         12:48:02.9 -08:55:35 15.4        55
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 535169, (2026/12/27 05:14UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0  9.78  64
40Psi Vir      12:54:21.1 -09:32:21  4.8  2.05  56
PPM 195839     12:47:06.3 -09:12:52  7.7  0.45  55
PPM 195837     12:47:02.1 -08:37:53  9.5  0.18  54
535169         12:46:38.8 -08:46:46 15.4        54
Positions are for J2000

Event circumstances last updated at 2024/04/18 03:45:22 UT

Marc W. Buie, Southwest Research Institute

RECON