Event between 98WS31 and star GA1180:02178250 with event index number of 1238682
Geocentric closest approach at 2022/09/03 02:01:11 UTC
J2000 position of star is 06:06:39.3 +29:50:26
Equinox of date position of star is 06:08:04.5 +29:50:12
Stellar brightness G=14.5,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 150 degrees from the moon.
Moon is 43% illuminated.
TNO apparent brightness V=23.7
TNO is 33.1 AU from the Sun
and 33.5 AU from the Earth.
The TNO is moving 16.1
km/sec on the sky relative to the star, or,
2.4 arcsec/hr.
The 1-sigma error in the time of the event is 572 seconds.
The 1-sigma cross-track error in the shadow position is
2606 km.
The TNO has an absolute magnitude Hv=8.3
Diameter=134.3 km assuming a 5% albedo -- 8.3 sec chord
Diameter=54.8 km assuming a 30% albedo -- 3.4 sec chord
Dynamical classification is 3:2E
Star training set for 98WS31, (2022/09/03 01:37UT) Object RA Dec mag sep mel Pollux 07:46:42.1 +27:58:11 1.1 21.62 128 Alnath 05:27:43.6 +28:37:28 1.6 8.89 159 PPM 071108 06:02:37.9 +31:02:00 6.0 1.68 151 PPM 095388 06:07:49.3 +29:30:31 8.1 0.33 150 PPM 071214 06:07:39.6 +30:03:32 10.5 0.24 150 98WS31 06:08:06.3 +29:50:11 14.5 150 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, (2022/09/03 01:37UT) Object RA Dec mag sep mel Pollux 07:45:17.9 +28:01:33 1.1 21.62 128 Alnath 05:26:17.5 +28:36:23 1.6 8.89 159 PPM 071108 06:01:10.0 +31:02:04 6.0 1.68 151 PPM 095388 06:06:22.4 +29:30:45 8.1 0.33 150 PPM 071214 06:06:12.3 +30:03:46 10.5 0.24 150 98WS31 06:06:39.3 +29:50:26 14.5 150 Positions are for J2000
Event circumstances last updated at 2022/03/16 00:57:43 UT
Marc W. Buie, Southwest Research Institute