RECON: TNO occultation with 523751

Event between (523751) 14UU224 and star GA0980:01287543 with event index number of 2363062

Geocentric closest approach at 2026/09/29 21:52:41 UTC

J2000 position of star is 06:04:53.8 +08:27:02
Equinox of date position of star is 06:06:12.4 +08:26:50
Stellar brightness G=16.2, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 47 degrees from the moon. Moon is 87% illuminated.
Apparent brightness V=22.2

Object is 30.8 AU from the Sun and 30.7 AU from the Earth.
Apparent velocity is 7.8 km/sec on the sky relative to the star, or, 1.3 arcsec/hr.
The 1-sigma error in the time of the event is 145 seconds.
The 1-sigma cross-track error in the shadow position is 1916 km.

The object has an absolute magnitude Hv=7.1
Diameter=228.0 km assuming a 5% albedo -- 29.5 sec chord
Diameter=93.1 km assuming a 30% albedo -- 12.0 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 523751, (2026/09/29 21:54UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:37.2 +07:24:35  0.4  2.62  45
Bellatrix      05:26:34.0 +06:22:18  1.6 10.08  39
63 Ori         06:06:23.8 +05:24:58  6.4  3.03  48
PPM 149829     06:04:59.9 +08:35:11  8.0  0.36  47
PPM 149881     06:07:06.4 +08:43:51  9.0  0.34  47
PPM 149854     06:06:07.4 +08:13:04 10.8  0.24  47
523751         06:06:21.3 +08:26:49 16.2        47
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 523751, (2026/09/29 21:54UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  2.62  45
Bellatrix      05:25:07.8 +06:20:58  1.6 10.08  39
63 Ori         06:04:58.1 +05:25:12  6.4  3.03  48
PPM 149829     06:03:32.3 +08:35:21  8.0  0.36  47
PPM 149881     06:05:38.7 +08:44:06  9.0  0.34  47
PPM 149854     06:04:40.0 +08:13:17 10.8  0.24  47
523751         06:04:53.8 +08:27:02 16.2        47
Positions are for J2000

Event circumstances last updated at 2024/01/09 04:29:47 UT

Marc W. Buie, Southwest Research Institute

RECON