RECON: TNO occultation with 533398

Event between (533398) 14GA54 and star GA0760:11721376 with event index number of 2164348

Geocentric closest approach at 2026/05/11 00:17:11 UTC

J2000 position of star is 18:02:41.3 -13:04:54
Equinox of date position of star is 18:04:04.2 -13:04:47
Stellar brightness G=15.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 63 degrees from the moon. Moon is 39% illuminated.
Apparent brightness V=22.2

Object is 31.1 AU from the Sun and 30.3 AU from the Earth.
Apparent velocity is 16.4 km/sec on the sky relative to the star, or, 2.7 arcsec/hr.
The 1-sigma error in the time of the event is 328 seconds.
The 1-sigma cross-track error in the shadow position is 1688 km.

The object has an absolute magnitude Hv=7.2
Diameter=215.8 km assuming a 5% albedo -- 13.1 sec chord
Diameter=88.1 km assuming a 30% albedo -- 5.4 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 533398, (2026/05/11 00:17UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:01.7 -26:29:17  0.9 25.61  84
35Eta Oph      17:11:53.5 -15:45:20  2.6 12.94  76
PPM 234113     18:11:13.2 -13:55:40  6.4  1.91  62
PPM 233886     18:01:56.0 -12:59:15  7.8  0.55  64
PPM 233948     18:04:05.2 -13:11:46  9.7  0.12  63
533398         18:04:10.6 -13:04:46 15.8        63
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 533398, (2026/05/11 00:17UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 25.61  84
35Eta Oph      17:10:22.7 -15:43:29  2.6 12.94  76
PPM 234113     18:09:43.4 -13:56:04  6.4  1.91  62
PPM 233886     18:00:26.8 -12:59:17  7.8  0.55  64
PPM 233948     18:02:35.9 -13:11:54  9.7  0.12  63
533398         18:02:41.3 -13:04:54 15.8        63
Positions are for J2000

Event circumstances last updated at 2024/06/18 21:26:40 UT

Marc W. Buie, Southwest Research Institute

RECON