RECON: TNO occultation with 555591

Event between (555591) 14AF61 and star GA0980:03567787 with event index number of 2226682

Geocentric closest approach at 2026/03/03 15:51:15 UTC

J2000 position of star is 09:55:55.0 +08:12:47
Equinox of date position of star is 09:57:08.5 +08:06:09
Stellar brightness G=15.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 17 degrees from the moon. Moon is 100% illuminated.
Apparent brightness V=22.9

Object is 35.9 AU from the Sun and 34.9 AU from the Earth.
Apparent velocity is 24.4 km/sec on the sky relative to the star, or, 3.5 arcsec/hr.
The 1-sigma error in the time of the event is 201 seconds.
The 1-sigma cross-track error in the shadow position is 5356 km.

The object has an absolute magnitude Hv=7.4
Diameter=200.5 km assuming a 5% albedo -- 8.2 sec chord
Diameter=81.8 km assuming a 30% albedo -- 3.3 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 555591, (2026/03/03 15:45UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:45.8 +11:50:18  1.3  4.85  15
PPM 156338     09:57:49.1 +08:48:29  5.8  0.73  17
PPM 156326     09:56:57.4 +07:58:35  8.5  0.14  17
555591         09:57:18.0 +08:05:17 15.7        17
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 555591, (2026/03/03 15:45UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3  4.85  15
PPM 156338     09:56:25.8 +08:56:00  5.8  0.73  17
PPM 156326     09:55:34.3 +08:06:05  8.5  0.14  17
555591         09:55:55.0 +08:12:47 15.7        17
Positions are for J2000

Event circumstances last updated at 2023/03/04 04:11:44 UT

Marc W. Buie, Southwest Research Institute

RECON