Event between (69990) 98WU31 and star UC4-551-017829 with event index number of 101251
Geocentric closest approach at 2018/01/06 16:57:59 UTC
J2000 position of star is 05:42:39.2 +20:03:38
Equinox of date position of star is 05:43:41.8 +20:04:04
Stellar brightness R=15.2,
use SENSEUP=128
Star is 83 degrees from the moon.
Moon is 73% illuminated.
TNO apparent brightness V=23.8
TNO is 35.4 AU from the Sun
and 34.5 AU from the Earth.
The TNO is moving 23.3
km/sec on the sky relative to the star, or,
3.4 arcsec/hr.
The 1-sigma error in the time of the event is 1976 seconds.
The 1-sigma cross-track error in the shadow position is
5680 km.
The TNO has an absolute magnitude Hv=8.3
Diameter=131.8 km assuming a 5% albedo -- 5.7 sec chord
Diameter=53.8 km assuming a 30% albedo -- 2.3 sec chord
Dynamical classification is 3:2E
Star training set for 69990, (2018/01/06 16:58UT) Object RA Dec mag sep mel Betelgeuse 05:56:08.9 +07:24:32 0.4 13.01 82 Alnath 05:27:25.9 +28:37:16 1.6 9.32 86 123Zet Tau 05:38:43.4 +21:09:07 3.0 1.60 84 PPM 121323 05:44:37.1 +19:32:51 8.5 0.56 83 PPM 121306 05:43:53.7 +19:51:18 9.4 0.22 83 69990 05:43:43.4 +20:04:04 15.2 83 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, (2018/01/06 16:58UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 13.01 82 Alnath 05:26:17.5 +28:36:24 1.6 9.32 86 123Zet Tau 05:37:38.7 +21:08:33 3.0 1.60 84 PPM 121323 05:43:33.2 +19:32:26 8.5 0.56 83 PPM 121306 05:42:49.6 +19:50:51 9.4 0.22 83 69990 05:42:39.2 +20:03:38 15.2 83 Positions are for J2000
Event circumstances last updated at 2017/07/30 16:19:02 UT
Marc W. Buie, Southwest Research Institute