Event between 98WY31 and star UC4-573-029102 with event index number of 106548
Geocentric closest approach at 2018/02/22 11:46:07 UTC
J2000 position of star is 06:26:07.2 +24:24:27
Equinox of date position of star is 06:27:13.1 +24:23:45
Stellar brightness R=15.3,
use SENSEUP=128
Star is 44 degrees from the moon.
Moon is 41% illuminated.
TNO apparent brightness V=23.3
TNO is 43.2 AU from the Sun
and 42.6 AU from the Earth.
The TNO is moving 11.9
km/sec on the sky relative to the star, or,
1.4 arcsec/hr.
The 1-sigma error in the time of the event is 916 seconds.
The 1-sigma cross-track error in the shadow position is
3049 km.
The TNO has an absolute magnitude Hv=6.8
Diameter=257.0 km assuming a 5% albedo -- 21.7 sec chord
Diameter=104.9 km assuming a 30% albedo -- 8.8 sec chord
Dynamical classification is CLASSICAL
Star training set for 98WY31, (2018/02/22 11:46UT) Object RA Dec mag sep mel Pollux 07:46:25.4 +27:58:51 1.1 18.10 61 Alhena 06:38:45.6 +16:22:56 1.9 8.46 46 PPM 095919 06:25:50.8 +25:02:15 6.3 0.71 43 PPM 095926 06:26:07.6 +24:17:27 8.5 0.27 43 PPM 095979 06:28:01.0 +24:12:49 9.9 0.26 44 PPM 095953 06:27:02.7 +24:22:32 10.7 0.05 43 98WY31 06:27:14.0 +24:23:44 15.3 44 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 98WY31, (2018/02/22 11:46UT) Object RA Dec mag sep mel Pollux 07:45:18.1 +28:01:33 1.1 18.10 61 Alhena 06:37:42.8 +16:23:57 1.9 8.46 46 PPM 095919 06:24:43.7 +25:02:55 6.3 0.71 43 PPM 095926 06:25:00.9 +24:18:07 8.5 0.27 43 PPM 095979 06:26:54.3 +24:13:32 9.9 0.26 44 PPM 095953 06:25:56.0 +24:23:14 10.7 0.05 43 98WY31 06:26:07.2 +24:24:27 15.3 43 Positions are for J2000
Event circumstances last updated at 2017/12/02 17:17:37 UT
Marc W. Buie, Southwest Research Institute