Event between 98WS31 and star GA1200:02130483 with event index number of 1238732
Geocentric closest approach at 2023/02/03 11:50:07 UTC
J2000 position of star is 05:57:32.0 +30:05:02
Equinox of date position of star is 05:59:00.7 +30:05:06
Stellar brightness G=16.0,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 20 degrees from the moon.
Moon is 95% illuminated.
Apparent brightness V=23.6
Object is 33.2 AU from the Sun
and 32.5 AU from the Earth.
Apparent velocity is 16.3
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 424 seconds.
The 1-sigma cross-track error in the shadow position is
1269 km.
The object has an absolute magnitude Hv=8.3
Diameter=134.3 km assuming a 5% albedo -- 8.2 sec chord
Diameter=54.8 km assuming a 30% albedo -- 3.4 sec chord
Dynamical classification is 3:2E
Star training set for 98WS31, (2023/02/03 12:10UT) Object RA Dec mag sep mel Betelgeuse 05:56:25.4 +07:24:34 0.4 22.68 29 Alnath 05:27:45.2 +28:37:29 1.6 6.97 27 PPM 095117 05:58:01.8 +28:56:38 6.5 1.16 20 PPM 095186 06:00:24.7 +29:59:02 7.5 0.32 20 PPM 071063 06:00:04.3 +30:12:28 8.9 0.26 20 98WS31 05:59:00.9 +30:05:06 16.0 20 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 98WS31, (2023/02/03 12:10UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 22.68 29 Alnath 05:26:17.5 +28:36:23 1.6 6.97 27 PPM 095117 05:56:33.8 +28:56:32 6.5 1.16 20 PPM 095186 05:58:55.9 +29:59:01 7.5 0.32 20 PPM 071063 05:58:35.4 +30:12:27 8.9 0.26 20 98WS31 05:57:32.0 +30:05:02 16.0 20 Positions are for J2000
Event circumstances last updated at 2023/01/10 03:22:50 UT
Marc W. Buie, Southwest Research Institute