RECON: TNO occultation with 55638

Event between (55638) 02VE95 and star GA0960:02602273 with event index number of 2250221

Geocentric closest approach at 2026/04/27 15:37:06 UTC

J2000 position of star is 07:06:04.5 +06:18:17
Equinox of date position of star is 07:07:22.2 +06:15:58
Stellar brightness G=13.9, use SENSEUP=64 with the MallinCam and and exposure time of 1 seconds with the QHY174 camera.
Star is 64 degrees from the moon. Moon is 84% illuminated.
Apparent brightness V=20.8

Object is 31.8 AU from the Sun and 32.1 AU from the Earth.
Apparent velocity is 17.2 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 158 seconds.
The 1-sigma cross-track error in the shadow position is 1680 km.

The object has an absolute magnitude Hv=5.6
Diameter=524.8 km assuming a 5% albedo -- 26.8 sec chord
Diameter=214.3 km assuming a 30% albedo -- 10.9 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 55638, (2026/04/27 15:37UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:35.8 +07:24:35  0.4 17.63  82
Alhena         06:39:13.9 +16:22:28  1.9 12.25  72
PPM 151978     07:09:14.8 +07:25:40  5.8  1.24  64
PPM 151918     07:07:23.0 +05:50:52  8.3  0.42  64
PPM 151946     07:08:18.3 +06:03:30  9.5  0.29  64
55638          07:07:29.1 +06:15:46 13.9        64
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 55638, (2026/04/27 15:37UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 17.63  82
Alhena         06:37:42.8 +16:23:57  1.9 12.25  72
PPM 151978     07:07:49.5 +07:28:15  5.8  1.24  64
PPM 151918     07:05:58.6 +05:53:23  8.3  0.42  64
PPM 151946     07:06:53.8 +06:06:04  9.5  0.29  64
55638          07:06:04.5 +06:18:17 13.9        64
Positions are for J2000

Event circumstances last updated at 2024/03/05 04:25:12 UT

Marc W. Buie, Southwest Research Institute

RECON