Event between (181855) 98WT31 and star GA1320:02836827 with event index number of 1211379
Geocentric closest approach at 2022/10/31 16:12:55 UTC
J2000 position of star is 05:17:12.1 +42:28:46
Equinox of date position of star is 05:18:49.4 +42:30:09
Stellar brightness G=15.5,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 140 degrees from the moon.
Moon is 43% illuminated.
TNO apparent brightness V=23.5
TNO is 37.6 AU from the Sun
and 36.9 AU from the Earth.
The TNO is moving 19.2
km/sec on the sky relative to the star, or,
2.6 arcsec/hr.
The 1-sigma error in the time of the event is 350 seconds.
The 1-sigma cross-track error in the shadow position is
4382 km.
The TNO has an absolute magnitude Hv=7.7
Diameter=173.8 km assuming a 5% albedo -- 9.1 sec chord
Diameter=70.9 km assuming a 30% albedo -- 3.7 sec chord
Dynamical classification is SCATEXTD
Star training set for 181855, (2022/10/31 16:13UT) Object RA Dec mag sep mel Aldebaran 04:37:14.0 +16:33:12 0.8 27.43 128 34Bet Aur 06:01:12.3 +44:56:50 1.9 8.03 146 20Rho Aur 05:23:25.5 +41:49:29 4.9 1.09 141 PPM 047916 05:17:50.6 +42:46:48 8.0 0.33 140 PPM 047908 05:17:18.7 +42:24:44 9.7 0.29 140 PPM 047930 05:18:34.0 +42:16:23 10.9 0.23 140 181855 05:18:49.8 +42:30:09 15.5 140 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, (2022/10/31 16:13UT) Object RA Dec mag sep mel Aldebaran 04:35:55.3 +16:30:29 0.8 27.43 128 34Bet Aur 05:59:31.6 +44:56:51 1.9 8.03 146 20Rho Aur 05:21:48.4 +41:48:15 4.9 1.09 141 PPM 047916 05:16:12.6 +42:45:22 8.0 0.33 140 PPM 047908 05:15:41.1 +42:23:18 9.7 0.29 140 PPM 047930 05:16:56.5 +42:14:59 10.9 0.23 140 181855 05:17:12.1 +42:28:46 15.5 140 Positions are for J2000
Event circumstances last updated at 2022/09/30 04:13:20 UT
Marc W. Buie, Southwest Research Institute