RECON: TNO occultation with 98WY24

Event between 98WY24 and star UC4-565-033362 with event index number of 96022

Geocentric closest approach at 2017/12/20 16:35:31 UTC

J2000 position of star is 06:51:32.2 +22:52:26
Equinox of date position of star is 06:52:35.2 +22:51:08
Stellar brightness R=15.5, use SENSEUP=128
Star is 167 degrees from the moon. Moon is 5% illuminated.
TNO apparent brightness V=22.8

TNO is 41.5 AU from the Sun and 40.6 AU from the Earth.
The TNO is moving 24.8 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 809 seconds.
The 1-sigma cross-track error in the shadow position is 3477 km.

The TNO has an absolute magnitude Hv=6.6
Diameter=291.1 km assuming a 5% albedo -- 11.7 sec chord
Diameter=118.8 km assuming a 30% albedo -- 4.8 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 98WY24, (2017/12/20 16:36UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:24.8 +27:58:53  1.1 13.17 171
Alhena         06:38:45.0 +16:22:57  1.9  7.25 163
36 Gem         06:52:37.6 +21:44:18  5.3  1.11 167
PPM 096582     06:50:13.9 +23:10:49  7.3  0.64 166
PPM 096666     06:53:44.8 +22:59:14  9.1  0.29 167
PPM 096636     06:52:29.6 +22:51:25 11.2  0.03 167
98WY24         06:52:37.3 +22:51:05 15.5       167
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 98WY24, (2017/12/20 16:36UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:18.1 +28:01:33  1.1 13.17 171
Alhena         06:37:42.8 +16:23:57  1.9  7.25 163
36 Gem         06:51:33.0 +21:45:39  5.3  1.11 167
PPM 096582     06:49:08.6 +23:12:06  7.3  0.64 166
PPM 096666     06:52:39.6 +23:00:36  9.1  0.29 167
PPM 096636     06:51:24.4 +22:52:46 11.2  0.03 167
98WY24         06:51:32.2 +22:52:26 15.5       167
Positions are for J2000

Event circumstances last updated at 2017/05/17 17:57:56 UT

Marc W. Buie, Southwest Research Institute

RECON