RECON: TNO occultation with 555632

Event between (555632) 14BZ57 and star GA0740:04463225 with event index number of 2471099

Geocentric closest approach at 2025/04/25 01:29:48 UTC

J2000 position of star is 09:56:50.4 -14:07:43
Equinox of date position of star is 09:58:00.6 -14:14:40
Stellar brightness G=14.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 149 degrees from the moon. Moon is 11% illuminated.
Apparent brightness V=20.7

Object is 37.1 AU from the Sun and 36.6 AU from the Earth.
Apparent velocity is 14.5 km/sec on the sky relative to the star, or, 2.0 arcsec/hr.
The 1-sigma error in the time of the event is 108 seconds.
The 1-sigma cross-track error in the shadow position is 1666 km.

The object has an absolute magnitude Hv=4.9
Diameter=608.2 km assuming a 5% albedo -- 42.7 sec chord
Diameter=248.3 km assuming a 30% albedo -- 17.4 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 555632, (2025/04/25 01:27UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:43.1 +11:50:33  1.3 26.25 153
Alphard        09:28:49.9 -08:46:10  2.0  9.01 144
39Ups1Hya      09:52:41.8 -14:57:59  4.3  1.48 147
PPM 222232     09:58:01.9 -14:30:43  8.4  0.26 149
PPM 222246     09:58:33.2 -14:13:09  9.4  0.12 149
555632         09:58:03.8 -14:14:59 14.8       149
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 555632, (2025/04/25 01:27UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3 26.25 153
Alphard        09:27:35.2 -08:39:30  2.0  9.01 144
39Ups1Hya      09:51:28.7 -14:50:49  4.3  1.48 147
PPM 222232     09:56:48.5 -14:23:27  8.4  0.26 149
PPM 222246     09:57:19.7 -14:05:52  9.4  0.12 149
555632         09:56:50.4 -14:07:43 14.8       149
Positions are for J2000

Event circumstances last updated at 2024/03/19 03:38:30 UT

Marc W. Buie, Southwest Research Institute

RECON