RECON: TNO occultation with 523749

Event between (523749) 14UR224 and star GA1080:00915599 with event index number of 2372676

Geocentric closest approach at 2026/01/23 18:52:06 UTC

J2000 position of star is 05:16:49.5 +19:55:23
Equinox of date position of star is 05:18:14.6 +19:56:52
Stellar brightness G=16.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 77 degrees from the moon. Moon is 25% illuminated.
Apparent brightness V=21.6

Object is 39.4 AU from the Sun and 38.7 AU from the Earth.
Apparent velocity is 16.9 km/sec on the sky relative to the star, or, 2.2 arcsec/hr.
The 1-sigma error in the time of the event is 128 seconds.
The 1-sigma cross-track error in the shadow position is 1510 km.

The object has an absolute magnitude Hv=5.6
Diameter=457.1 km assuming a 5% albedo -- 27.5 sec chord
Diameter=186.6 km assuming a 30% albedo -- 11.2 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 523749, (2026/01/23 18:50UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:25.1 +16:33:35  0.8 10.29  67
Alnath         05:27:56.5 +28:37:37  1.6  8.95  79
PPM 120839     05:21:50.6 +19:36:09  6.5  0.89  78
PPM 094230     05:18:22.0 +20:08:41  7.8  0.20  77
523749         05:18:22.0 +19:56:59 16.0        77
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 523749, (2026/01/23 18:50UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 10.29  67
Alnath         05:26:17.6 +28:36:23  1.6  8.95  79
PPM 120839     05:20:18.3 +19:34:41  6.5  0.89  78
PPM 094230     05:16:49.3 +20:07:05  7.8  0.20  77
523749         05:16:49.5 +19:55:23 16.0        77
Positions are for J2000

Event circumstances last updated at 2023/12/22 05:59:32 UT

Marc W. Buie, Southwest Research Institute

RECON