Event between (181855) 98WT31 and star TYC22893-01704-1 with event index number of 148639
Geocentric closest approach at 2018/08/26 14:43:06 UTC
J2000 position of star is 04:47:05.5 +38:38:30
Equinox of date position of star is 04:48:19.5 +38:40:23
Stellar brightness V=11.2,
use SENSEUP=8
Star is 101 degrees from the moon.
Moon is 100% illuminated.
TNO apparent brightness V=23.1
TNO is 37.6 AU from the Sun
and 37.8 AU from the Earth.
The TNO is moving 14.7
km/sec on the sky relative to the star, or,
1.9 arcsec/hr.
The 1-sigma error in the time of the event is 223 seconds.
The 1-sigma cross-track error in the shadow position is
4168 km.
The TNO has an absolute magnitude Hv=7.2
Diameter=218.8 km assuming a 5% albedo -- 14.9 sec chord
Diameter=89.3 km assuming a 30% albedo -- 6.1 sec chord
Dynamical classification is SCATEXTD
Star training set for 181855, (2018/08/26 14:43UT) Object RA Dec mag sep mel Aldebaran 04:36:59.6 +16:32:43 0.8 22.27 95 3Iot Aur 04:58:12.7 +33:11:38 2.7 5.83 102 PPM 069587 04:43:06.5 +38:18:51 6.2 1.09 100 PPM 069615 04:45:51.6 +38:17:18 7.1 0.62 100 PPM 069613 04:45:49.2 +38:46:59 8.7 0.51 100 181855 04:48:21.8 +38:40:26 11.2 101 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 181855, (2018/08/26 14:43UT) Object RA Dec mag sep mel Aldebaran 04:35:55.3 +16:30:30 0.8 22.27 95 3Iot Aur 04:56:59.6 +33:09:58 2.7 5.83 102 PPM 069587 04:41:50.6 +38:16:47 6.2 1.09 100 PPM 069615 04:44:35.6 +38:15:18 7.1 0.62 100 PPM 069613 04:44:32.9 +38:44:59 8.7 0.51 100 181855 04:47:05.5 +38:38:30 11.2 101 Positions are for J2000
Event circumstances last updated at 2018/02/06 17:41:12 UT
Marc W. Buie, Southwest Research Institute