RECON: TNO occultation with 55638

Event between (55638) 02VE95 and star GA0940:02547717 with event index number of 2250360

Geocentric closest approach at 2027/04/22 02:29:00 UTC

J2000 position of star is 07:14:12.8 +05:59:05
Equinox of date position of star is 07:15:30.3 +05:56:30
Stellar brightness G=15.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 114 degrees from the moon. Moon is 98% illuminated.
Apparent brightness V=20.9

Object is 32.0 AU from the Sun and 32.2 AU from the Earth.
Apparent velocity is 14.0 km/sec on the sky relative to the star, or, 2.2 arcsec/hr.
The 1-sigma error in the time of the event is 230 seconds.
The 1-sigma cross-track error in the shadow position is 1562 km.

The object has an absolute magnitude Hv=5.6
Diameter=524.8 km assuming a 5% albedo -- 32.8 sec chord
Diameter=214.3 km assuming a 30% albedo -- 13.4 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 55638, (2027/04/22 02:29UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:39.0 +07:24:35  0.4 19.67 133
Alhena         06:39:17.3 +16:22:25  1.9 13.72 126
PPM 152128     07:13:18.7 +05:36:26  6.0  0.67 114
PPM 152245     07:16:42.4 +05:46:08  6.9  0.31 114
PPM 152208     07:15:45.3 +05:50:25 10.0  0.10 114
55638          07:15:40.3 +05:56:10 15.7       114
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, (2027/04/22 02:29UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 19.67 133
Alhena         06:37:42.8 +16:23:57  1.9 13.72 126
PPM 152128     07:11:51.4 +05:39:16  6.0  0.67 114
PPM 152245     07:15:15.0 +05:49:06  6.9  0.31 114
PPM 152208     07:14:17.8 +05:53:21 10.0  0.10 114
55638          07:14:12.8 +05:59:05 15.7       114
Positions are for J2000

Event circumstances last updated at 2024/03/06 04:10:46 UT

Marc W. Buie, Southwest Research Institute

RECON