RECON: TNO occultation with 543733

Event between (543733) 14OZ393 and star GA1000:00449548 with event index number of 2252083

Geocentric closest approach at 2026/02/07 21:33:56 UTC

J2000 position of star is 04:28:40.4 +11:15:08
Equinox of date position of star is 04:29:59.5 +11:18:12
Stellar brightness G=12.6, use SENSEUP=16 with the MallinCam and and exposure time of 250 milli-seconds with the QHY174 camera.
Star is 141 degrees from the moon. Moon is 65% illuminated.
Apparent brightness V=22.4

Object is 38.7 AU from the Sun and 38.4 AU from the Earth.
Apparent velocity is 6.2 km/sec on the sky relative to the star, or, 0.8 arcsec/hr.
The 1-sigma error in the time of the event is 402 seconds.
The 1-sigma cross-track error in the shadow position is 2084 km.

The object has an absolute magnitude Hv=6.4
Diameter=313.3 km assuming a 5% albedo -- 50.4 sec chord
Diameter=127.9 km assuming a 30% albedo -- 20.6 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 543733, (2026/02/07 21:35UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:25.3 +16:33:35  0.8  5.54 140
Bellatrix      05:26:32.0 +06:22:16  1.6 14.78 127
PPM 119911     04:28:55.3 +11:16:08  5.9  0.30 142
PPM 119915     04:29:13.2 +11:47:34  7.7  0.53 142
PPM 119911     04:28:55.3 +11:16:08  5.9  0.30 142
PPM 119936     04:30:04.1 +11:17:19 11.2  0.02 141
543733         04:30:07.1 +11:18:30 12.6       141
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 543733, (2026/02/07 21:35UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8  5.54 140
Bellatrix      05:25:07.8 +06:20:58  1.6 14.78 127
PPM 119911     04:27:28.7 +11:12:44  5.9  0.30 142
PPM 119915     04:27:46.2 +11:44:11  7.7  0.53 142
PPM 119911     04:27:28.7 +11:12:44  5.9  0.30 142
PPM 119936     04:28:37.4 +11:13:57 11.2  0.02 141
543733         04:28:40.4 +11:15:08 12.6       141
Positions are for J2000

Event circumstances last updated at 2023/10/25 01:48:00 UT

Marc W. Buie, Southwest Research Institute

RECON