RECON: TNO occultation with 55638

Event between (55638) 02VE95 and star GA0960:02299874 with event index number of 2249844

Geocentric closest approach at 2024/01/02 14:24:30 UTC

J2000 position of star is 06:52:40.4 +06:03:28
Equinox of date position of star is 06:53:57.3 +06:01:37
Stellar brightness G=16.3, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 73 degrees from the moon. Moon is 65% illuminated.
Apparent brightness V=20.5

Object is 31.2 AU from the Sun and 30.2 AU from the Earth.
Apparent velocity is 24.5 km/sec on the sky relative to the star, or, 4.0 arcsec/hr.
The 1-sigma error in the time of the event is 99 seconds.
The 1-sigma cross-track error in the shadow position is 1147 km.

The object has an absolute magnitude Hv=5.6
Diameter=524.8 km assuming a 5% albedo -- 18.7 sec chord
Diameter=214.3 km assuming a 30% albedo -- 7.6 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 55638, (2024/01/02 14:25UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:28.3 +07:24:34  0.4 14.34  87
Alhena         06:39:05.9 +16:22:36  1.9 10.97  76
PPM 151677     07:00:37.9 +07:16:56  6.1  2.08  71
PPM 151373     06:52:16.5 +05:48:44  7.4  0.47  73
PPM 151433     06:53:44.9 +06:10:39  8.8  0.16  73
55638          06:53:57.6 +06:01:37 16.3        72
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, (2024/01/02 14:25UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 14.34  87
Alhena         06:37:42.8 +16:23:57  1.9 10.97  76
PPM 151677     06:59:20.1 +07:19:00  6.1  2.08  71
PPM 151373     06:50:59.5 +05:50:32  7.4  0.47  73
PPM 151433     06:52:27.7 +06:12:30  8.8  0.16  73
55638          06:52:40.4 +06:03:28 16.3        73
Positions are for J2000

Event circumstances last updated at 2023/12/06 05:56:15 UT

Marc W. Buie, Southwest Research Institute

RECON