Event between (79983) 99DF9 and star GA0820:04208801 with event index number of 2400714
Geocentric closest approach at 2023/04/30 16:23:11 UTC
J2000 position of star is 12:16:41.9 -07:46:33
Equinox of date position of star is 12:17:50.9 -07:53:59
Stellar brightness G=16.8,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 28 degrees from the moon.
Moon is 76% illuminated.
TNO apparent brightness V=22.3
TNO is 40.8 AU from the Sun
and 39.9 AU from the Earth.
The TNO is moving 20.2
km/sec on the sky relative to the star, or,
2.5 arcsec/hr.
The 1-sigma error in the time of the event is 90 seconds.
The 1-sigma cross-track error in the shadow position is
1615 km.
The TNO has an absolute magnitude Hv=6.1
Diameter=361.4 km assuming a 5% albedo -- 17.9 sec chord
Diameter=147.5 km assuming a 30% albedo -- 7.3 sec chord
Dynamical classification is CLASSICAL
Star training set for 79983, (2023/04/30 16:23UT) Object RA Dec mag sep mel Spica 13:26:25.5 -11:16:56 1.0 17.22 44 4Gam Crv 12:17:00.6 -17:40:17 2.6 9.77 35 PPM 225575 12:16:22.7 -10:26:53 6.1 2.57 29 PPM 195325 12:17:33.7 -07:39:41 8.0 0.26 28 PPM 195330 12:17:51.0 -07:45:12 9.6 0.15 28 79983 12:17:53.9 -07:54:19 16.8 28 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 79983, (2023/04/30 16:23UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 17.22 44 4Gam Crv 12:15:48.1 -17:32:30 2.6 9.77 35 PPM 225575 12:15:10.6 -10:19:07 6.1 2.57 29 PPM 195325 12:16:21.6 -07:31:55 8.0 0.26 28 PPM 195330 12:16:39.0 -07:37:26 9.6 0.15 28 79983 12:16:41.9 -07:46:33 16.8 28 Positions are for J2000
Event circumstances last updated at 2022/05/03 01:15:03 UT
Marc W. Buie, Southwest Research Institute