Event between (69990) 98WU31 and star GA1080:01591628 with event index number of 1059136
Geocentric closest approach at 2021/03/06 11:34:15 UTC
J2000 position of star is 06:01:47.0 +19:38:40
Equinox of date position of star is 06:03:01.7 +19:38:36
Stellar brightness G=16.6,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 170 degrees from the moon.
Moon is 45% illuminated.
TNO apparent brightness V=23.8
TNO is 35.9 AU from the Sun
and 35.7 AU from the Earth.
The TNO is moving 3.2
km/sec on the sky relative to the star, or,
0.5 arcsec/hr.
The 1-sigma error in the time of the event is 477 seconds.
The 1-sigma cross-track error in the shadow position is
3940 km.
The TNO has an absolute magnitude Hv=8.1
Diameter=144.5 km assuming a 5% albedo -- 44.6 sec chord
Diameter=59.0 km assuming a 30% albedo -- 18.2 sec chord
Dynamical classification is 3:2E
Star training set for 69990, (2021/03/06 11:34UT) Object RA Dec mag sep mel Betelgeuse 05:56:19.1 +07:24:33 0.4 12.34 162 Alhena 06:38:56.1 +16:22:46 1.9 9.14 161 64 Ori 06:04:42.5 +19:41:19 4.9 0.40 170 PPM 121805 06:03:55.5 +19:55:56 8.5 0.36 170 PPM 121750 06:02:09.8 +19:48:48 8.6 0.27 170 PPM 121765 06:02:36.0 +19:53:08 10.4 0.26 170 69990 06:03:02.2 +19:38:36 16.6 170 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 69990, (2021/03/06 11:34UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 12.34 162 Alhena 06:37:42.8 +16:23:57 1.9 9.14 161 64 Ori 06:03:27.3 +19:41:26 4.9 0.40 170 PPM 121805 06:02:40.1 +19:56:02 8.5 0.36 170 PPM 121750 06:00:54.5 +19:48:51 8.6 0.27 170 PPM 121765 06:01:20.6 +19:53:12 10.4 0.26 170 69990 06:01:47.0 +19:38:40 16.6 170 Positions are for J2000
Event circumstances last updated at 2021/01/19 20:47:19 UT
Marc W. Buie, Southwest Research Institute