RECON: TNO occultation with 523731

Event between (523731) 14OK394 and star GA1080:00619673 with event index number of 2373300

Geocentric closest approach at 2026/08/17 08:08:04 UTC

J2000 position of star is 04:37:26.6 +18:30:25
Equinox of date position of star is 04:38:50.6 +18:33:13
Stellar brightness G=13.4, use SENSEUP=32 with the MallinCam and and exposure time of 500 milli-seconds with the QHY174 camera.
Star is 132 degrees from the moon. Moon is 24% illuminated.
Apparent brightness V=22.1

Object is 37.4 AU from the Sun and 37.7 AU from the Earth.
Apparent velocity is 13.2 km/sec on the sky relative to the star, or, 1.7 arcsec/hr.
The 1-sigma error in the time of the event is 291 seconds.
The 1-sigma cross-track error in the shadow position is 1818 km.

The object has an absolute magnitude Hv=6.2
Diameter=332.7 km assuming a 5% albedo -- 25.9 sec chord
Diameter=135.8 km assuming a 30% albedo -- 10.6 sec chord
Dynamical classification is 5:3EE
 
 
 
 
 
 
 
 

Star training set for 523731, (2026/08/17 08:04UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:27.1 +16:33:39  0.8  2.03 132
Alnath         05:27:58.6 +28:37:39  1.6 15.06 120
PPM 120015     04:35:05.6 +18:04:15  6.3  1.05 133
PPM 120081     04:38:47.8 +18:35:41  7.8  0.06 132
523731         04:38:59.7 +18:33:31 13.4       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 523731, (2026/08/17 08:04UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8  2.03 132
Alnath         05:26:17.6 +28:36:22  1.6 15.06 120
PPM 120015     04:33:33.0 +18:01:00  6.3  1.05 133
PPM 120081     04:37:14.8 +18:32:34  7.8  0.06 132
523731         04:37:26.6 +18:30:25 13.4       132
Positions are for J2000

Event circumstances last updated at 2024/01/09 04:29:29 UT

Marc W. Buie, Southwest Research Institute

RECON