Event between (28978) Ixion and star UC4-309-125648 with event index number of 80985
Geocentric closest approach at 2017/08/01 21:10:11 UTC
J2000 position of star is 17:32:14.4 -28:16:33
Equinox of date position of star is 17:33:15.9 -28:17:12
Stellar brightness R=16.4
Star is 22 degrees from the moon.
Moon is 71% illuminated.
TNO apparent brightness V=19.7
TNO is 39.7 AU from the Sun
and 39.0 AU from the Earth.
The TNO is moving 16.0
km/sec on the sky relative to the star, or,
2.0 arcsec/hr.
The 1-sigma error in the time of the event is 255 seconds.
The 1-sigma cross-track error in the shadow position is
2518 km.
The TNO has an absolute magnitude Hv=3.6
Diameter=1148.2 km assuming a 5% albedo -- 71.7 sec chord
Diameter=468.7 km assuming a 30% albedo -- 29.3 sec chord
Dynamical classification is 3:2E
Star training set for 28978, (2017/08/01 21:10UT) Object RA Dec mag sep mel Antares 16:30:29.3 -26:28:10 0.9 14.06 11 34Ups Sco 17:31:57.7 -37:18:29 2.7 9.03 27 PPM 266892 17:28:44.9 -29:44:17 6.4 1.77 22 PPM 267033 17:36:17.0 -28:12:51 8.5 0.65 22 PPM 266977 17:33:13.4 -28:07:37 8.7 0.16 22 28978 17:33:21.0 -28:17:15 16.4 22 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.
Event circumstances last updated at 2016/03/21 17:20:39 UT
Marc W. Buie, Southwest Research Institute