RECON: TNO occultation with 523644

Event between (523644) 10VX11 and star GA0900:01454248 with event index number of 2382225

Geocentric closest approach at 2025/09/05 06:56:29 UTC

J2000 position of star is 06:29:43.8 +01:58:04
Equinox of date position of star is 06:30:59.2 +01:57:00
Stellar brightness G=15.3, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 139 degrees from the moon. Moon is 92% illuminated.
Apparent brightness V=21.0

Object is 28.3 AU from the Sun and 28.6 AU from the Earth.
Apparent velocity is 20.6 km/sec on the sky relative to the star, or, 3.6 arcsec/hr.
The 1-sigma error in the time of the event is 72 seconds.
The 1-sigma cross-track error in the shadow position is 1252 km.

The object has an absolute magnitude Hv=6.3
Diameter=326.6 km assuming a 5% albedo -- 16.1 sec chord
Diameter=133.3 km assuming a 30% albedo -- 6.6 sec chord
Dynamical classification is 3:2E+6:4II
 
 
 
 
 
 
 
 

Star training set for 523644, (2025/09/05 06:54UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:33.8 +07:24:35  0.4 10.18 134
Alhena         06:39:11.7 +16:22:31  1.9 14.56 146
PPM 150581     06:29:36.8 +01:53:41  6.4  0.37 139
523644         06:31:03.9 +01:56:56 15.3       140
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 523644, (2025/09/05 06:54UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 10.18 134
Alhena         06:37:42.8 +16:23:57  1.9 14.56 146
PPM 150581     06:28:16.7 +01:54:46  6.4  0.37 139
523644         06:29:43.8 +01:58:04 15.3       139
Positions are for J2000

Event circumstances last updated at 2024/03/04 05:36:05 UT

Marc W. Buie, Southwest Research Institute

RECON