RECON: TNO occultation with 523644

Event between (523644) 10VX11 and star GA0920:01681527 with event index number of 2382363

Geocentric closest approach at 2026/09/15 04:31:32 UTC

J2000 position of star is 06:41:13.9 +02:00:31
Equinox of date position of star is 06:42:29.3 +01:59:03
Stellar brightness G=16.2, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 116 degrees from the moon. Moon is 17% illuminated.
Apparent brightness V=21.0

Object is 28.2 AU from the Sun and 28.5 AU from the Earth.
Apparent velocity is 18.1 km/sec on the sky relative to the star, or, 3.1 arcsec/hr.
The 1-sigma error in the time of the event is 92 seconds.
The 1-sigma cross-track error in the shadow position is 1455 km.

The object has an absolute magnitude Hv=6.3
Diameter=326.6 km assuming a 5% albedo -- 18.4 sec chord
Diameter=133.3 km assuming a 30% albedo -- 7.5 sec chord
Dynamical classification is 3:2E+6:4II
 
 
 
 
 
 
 
 

Star training set for 523644, (2026/09/15 04:28UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:37.1 +07:24:35  0.4 12.68 129
Alhena         06:39:15.2 +16:22:27  1.9 14.42 121
PPM 150940     06:40:01.3 +01:35:17  6.2  0.76 117
PPM 150989     06:40:58.7 +02:16:48  8.2  0.51 117
PPM 151064     06:42:56.5 +02:01:10  9.0  0.09 116
523644         06:42:37.2 +01:58:53 16.2       116
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, (2026/09/15 04:28UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 12.68 129
Alhena         06:37:42.8 +16:23:57  1.9 14.42 121
PPM 150940     06:38:38.2 +01:36:48  6.2  0.76 117
PPM 150989     06:39:35.2 +02:18:22  8.2  0.51 117
PPM 151064     06:41:33.1 +02:02:48  9.0  0.09 116
523644         06:41:13.9 +02:00:31 16.2       116
Positions are for J2000

Event circumstances last updated at 2024/03/05 04:39:56 UT

Marc W. Buie, Southwest Research Institute

RECON