RECON: TNO occultation with 488644

Event between (488644) 03HY56 and star UC4-380-067284 with event index number of 193869

Geocentric closest approach at 2018/01/27 06:44:33 UTC

J2000 position of star is 14:20:28.3 -14:01:38
Equinox of date position of star is 14:21:25.2 -14:06:23
Stellar brightness R=12.7, use SENSEUP=16
Star is 149 degrees from the moon. Moon is 75% illuminated.
TNO apparent brightness V=24.3

TNO is 42.0 AU from the Sun and 41.9 AU from the Earth.
The TNO is moving 5.1 km/sec on the sky relative to the star, or, 0.6 arcsec/hr.
The 1-sigma error in the time of the event is 471 seconds.
The 1-sigma cross-track error in the shadow position is 1691 km.

The TNO has an absolute magnitude Hv=7.9
Diameter=158.5 km assuming a 5% albedo -- 31.2 sec chord
Diameter=64.7 km assuming a 30% albedo -- 12.7 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 488644, (2018/01/27 06:45UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:08.9 -11:15:18  1.0 13.79 136
2 Lib          14:24:24.1 -11:47:45  6.2  2.42 150
PPM 228623     14:20:14.0 -14:29:26  7.3  0.48 149
PPM 228631     14:20:40.0 -13:51:46  9.5  0.31 149
488644         14:21:27.4 -14:06:34 12.7       150
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 488644, (2018/01/27 06:45UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 13.79 136
2 Lib          14:23:25.6 -11:42:52  6.2  2.42 150
PPM 228623     14:19:14.9 -14:24:29  7.3  0.48 149
PPM 228631     14:19:41.0 -13:46:50  9.5  0.31 149
488644         14:20:28.3 -14:01:38 12.7       149
Positions are for J2000

Event circumstances last updated at 2017/06/01 18:07:52 UT

Marc W. Buie, Southwest Research Institute

RECON