Event between 98WS31 and star GA1180:01362873 with event index number of 188317
Geocentric closest approach at 2019/04/09 12:55:10 UTC
J2000 position of star is 05:20:06.7 +29:15:23
Equinox of date position of star is 05:21:18.1 +29:16:27
Stellar brightness G=16.4,
use SENSEUP=128
Star is 16 degrees from the moon.
Moon is 17% illuminated.
TNO apparent brightness V=23.6
TNO is 32.6 AU from the Sun
and 33.1 AU from the Earth.
The TNO is moving 19.2
km/sec on the sky relative to the star, or,
2.9 arcsec/hr.
The 1-sigma error in the time of the event is 886 seconds.
The 1-sigma cross-track error in the shadow position is
2639 km.
The TNO has an absolute magnitude Hv=8.3
Diameter=134.3 km assuming a 5% albedo -- 7.0 sec chord
Diameter=54.8 km assuming a 30% albedo -- 2.8 sec chord
Dynamical classification is 3:2E
Star training set for 98WS31, (2019/04/09 12:55UT) Object RA Dec mag sep mel Aldebaran 04:37:01.7 +16:32:47 0.8 16.29 2 Alnath 05:27:30.7 +28:37:19 1.6 1.50 17 PPM 094297 05:22:26.3 +29:35:15 5.7 0.39 16 PPM 094248 05:19:28.6 +28:47:56 7.4 0.63 15 PPM 094287 05:21:57.8 +28:54:40 9.3 0.39 16 PPM 094269 05:20:54.0 +29:31:08 10.7 0.26 16 98WS31 05:21:20.1 +29:16:29 16.4 16 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, (2019/04/09 12:55UT) Object RA Dec mag sep mel Aldebaran 04:35:55.3 +16:30:30 0.8 16.29 2 Alnath 05:26:17.5 +28:36:23 1.6 1.50 17 PPM 094297 05:21:12.7 +29:34:11 5.7 0.39 16 PPM 094248 05:18:15.4 +28:46:47 7.4 0.63 15 PPM 094287 05:20:44.5 +28:53:35 9.3 0.39 16 PPM 094269 05:19:40.3 +29:30:01 10.7 0.26 16 98WS31 05:20:06.7 +29:15:23 16.4 16 Positions are for J2000
Event circumstances last updated at 2018/09/29 17:38:07 UT
Marc W. Buie, Southwest Research Institute