Event between (503858) 98HQ151 and star GA0740:18491398 with event index number of 227688
Geocentric closest approach at 2018/10/20 21:25:18 UTC
J2000 position of star is 18:28:33.7 -14:10:52
Equinox of date position of star is 18:29:36.5 -14:10:06
Stellar brightness G=16.3,
use SENSEUP=128
Star is 67 degrees from the moon.
Moon is 85% illuminated.
TNO apparent brightness V=24.1
TNO is 32.3 AU from the Sun
and 32.6 AU from the Earth.
The TNO is moving 16.7
km/sec on the sky relative to the star, or,
2.5 arcsec/hr.
The 1-sigma error in the time of the event is 345 seconds.
The 1-sigma cross-track error in the shadow position is
2408 km.
The TNO has an absolute magnitude Hv=8.8
Diameter=104.7 km assuming a 5% albedo -- 6.3 sec chord
Diameter=42.8 km assuming a 30% albedo -- 2.6 sec chord
Dynamical classification is 3:2E
Star training set for 503858, (2018/10/20 21:25UT) Object RA Dec mag sep mel Antares 16:30:33.8 -26:28:20 0.9 30.40 93 Nunki 18:56:25.8 -26:16:18 2.0 13.63 60 PPM 234686 18:33:47.8 -14:51:02 5.1 1.22 66 PPM 234611 18:30:51.1 -14:34:05 6.6 0.50 66 PPM 234588 18:29:49.3 -14:10:34 9.4 0.05 67 503858 18:29:37.8 -14:10:05 16.3 66 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 503858, (2018/10/20 21:25UT) Object RA Dec mag sep mel Antares 16:29:24.4 -26:25:56 0.9 30.40 93 Nunki 18:55:15.9 -26:17:49 2.0 13.63 60 PPM 234686 18:32:43.3 -14:51:57 5.1 1.22 66 PPM 234611 18:29:46.8 -14:34:55 6.6 0.50 66 PPM 234588 18:28:45.2 -14:11:22 9.4 0.05 67 503858 18:28:33.7 -14:10:52 16.3 67 Positions are for J2000
Event circumstances last updated at 2018/06/05 16:30:54 UT
Marc W. Buie, Southwest Research Institute