Event between 98WS31 and star GA1180:01998749 with event index number of 1141950
Geocentric closest approach at 2021/09/10 18:57:16 UTC
J2000 position of star is 05:57:55.3 +29:48:43
Equinox of date position of star is 05:59:18.5 +29:48:46
Stellar brightness G=15.8,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 128 degrees from the moon.
Moon is 18% illuminated.
TNO apparent brightness V=23.7
TNO is 33.0 AU from the Sun
and 33.2 AU from the Earth.
The TNO is moving 11.5
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 670 seconds.
The 1-sigma cross-track error in the shadow position is
2709 km.
The TNO has an absolute magnitude Hv=8.3
Diameter=134.3 km assuming a 5% albedo -- 11.7 sec chord
Diameter=54.8 km assuming a 30% albedo -- 4.8 sec chord
Dynamical classification is 3:2E
Star training set for 98WS31, (2021/09/10 18:28UT) Object RA Dec mag sep mel Betelgeuse 05:56:20.8 +07:24:34 0.4 22.41 128 Alnath 05:27:39.9 +28:37:25 1.6 7.00 134 PPM 095117 05:57:56.5 +28:56:37 6.5 0.92 128 PPM 095161 05:59:47.3 +29:37:39 8.2 0.21 127 PPM 095148 05:59:14.0 +29:48:48 10.0 0.02 127 98WS31 05:59:18.7 +29:48:46 15.8 127 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, (2021/09/10 18:28UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 22.41 128 Alnath 05:26:17.5 +28:36:23 1.6 7.00 134 PPM 095117 05:56:33.8 +28:56:32 6.5 0.92 128 PPM 095161 05:58:24.1 +29:37:37 8.2 0.21 127 PPM 095148 05:57:50.7 +29:48:46 10.0 0.02 127 98WS31 05:57:55.3 +29:48:43 15.8 127 Positions are for J2000
Event circumstances last updated at 2021/08/30 01:15:48 UT
Marc W. Buie, Southwest Research Institute