Event between (50000) Quaoar and star UC4-373-108225 with event index number of 85882
Geocentric closest approach at 2017/10/09 21:27:18 UTC
J2000 position of star is 17:54:13.2 -15:35:39
Equinox of date position of star is 17:55:13.8 -15:35:47
Stellar brightness R=15.9,
use SENSEUP=128
Star is 163 degrees from the moon.
Moon is 79% illuminated.
TNO apparent brightness V=18.9
TNO is 42.9 AU from the Sun
and 43.2 AU from the Earth.
The TNO is moving 14.7
km/sec on the sky relative to the star, or,
1.7 arcsec/hr.
The 1-sigma error in the time of the event is 156 seconds.
The 1-sigma cross-track error in the shadow position is
1823 km.
The TNO has an absolute magnitude Hv=2.4
Diameter=1995.3 km assuming a 5% albedo -- 135.7 sec chord
Diameter=814.6 km assuming a 30% albedo -- 55.4 sec chord
Dynamical classification is CLASSICAL
Star training set for 50000, (2017/10/09 21:27UT) Object RA Dec mag sep mel Antares 16:30:30.0 -26:28:12 0.9 22.52 170 35Eta Oph 17:11:23.9 -15:44:45 2.6 10.55 174 PPM 233766 17:57:20.4 -15:48:51 6.1 0.55 163 PPM 233733 17:55:50.0 -15:32:41 9.6 0.15 163 50000 17:55:14.5 -15:35:47 15.9 163 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 50000, (2017/10/09 21:27UT) Object RA Dec mag sep mel Antares 16:29:24.4 -26:25:56 0.9 22.52 170 35Eta Oph 17:10:22.7 -15:43:29 2.6 10.55 174 PPM 233766 17:56:19.0 -15:48:46 6.1 0.55 163 PPM 233733 17:54:48.7 -15:32:34 9.6 0.15 163 50000 17:54:13.2 -15:35:39 15.9 163 Positions are for J2000
Event circumstances last updated at 2017/07/25 16:13:16 UT
Marc W. Buie, Southwest Research Institute