Event between (31824) Elatus and star GA0840:04320189 with event index number of 2195479
Geocentric closest approach at 2021/12/18 06:09:54 UTC
J2000 position of star is 13:43:21.0 -05:47:01
Equinox of date position of star is 13:44:29.3 -05:53:33
Stellar brightness G=15.2,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 129 degrees from the moon.
Moon is 99% illuminated.
TNO apparent brightness V=22.5
TNO is 16.0 AU from the Sun
and 16.5 AU from the Earth.
The TNO is moving 20.9
km/sec on the sky relative to the star, or,
6.3 arcsec/hr.
The 1-sigma error in the time of the event is 59 seconds.
The 1-sigma cross-track error in the shadow position is
850 km.
The TNO has an absolute magnitude Hv=10.1
Diameter=56.5 km assuming a 5% albedo -- 2.7 sec chord
Diameter=23.1 km assuming a 30% albedo -- 1.1 sec chord
Dynamical classification is CENTAURR
Star training set for 31824, (2021/12/18 06:10UT) Object RA Dec mag sep mel Spica 13:26:21.2 -11:16:31 1.0 7.00 127 80 Vir 13:36:40.0 -05:30:27 5.7 1.99 127 PPM 196818 13:45:03.0 -05:36:32 7.1 0.32 129 PPM 196810 13:44:49.0 -05:42:36 9.3 0.20 129 31824 13:44:29.9 -05:53:36 15.2 130 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 31824, (2021/12/18 06:10UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 7.00 127 80 Vir 13:35:31.3 -05:23:44 5.7 1.99 127 PPM 196818 13:43:54.2 -05:29:57 7.1 0.32 129 PPM 196810 13:43:40.2 -05:36:01 9.3 0.20 129 31824 13:43:21.0 -05:47:01 15.2 129 Positions are for J2000
Event circumstances last updated at 2021/10/10 01:01:12 UT
Marc W. Buie, Southwest Research Institute