Event between (434390) 05CH81 and star UC4-508-052904 with event index number of 73988
Geocentric closest approach at 2017/03/29 01:50:50 UTC
J2000 position of star is 10:43:12.8 +11:26:49
Equinox of date position of star is 10:44:04.1 +11:21:42
Stellar brightness R=16.3
Star is 137 degrees from the moon.
Moon is 1% illuminated.
TNO apparent brightness V=24.1
TNO is 38.2 AU from the Sun
and 37.3 AU from the Earth.
The TNO is moving 20.5
km/sec on the sky relative to the star, or,
2.7 arcsec/hr.
The 1-sigma error in the time of the event is 177 seconds.
The 1-sigma cross-track error in the shadow position is
2336 km.
The TNO has an absolute magnitude Hv=8.2
Diameter=138.0 km assuming a 5% albedo -- 6.7 sec chord
Diameter=56.4 km assuming a 30% albedo -- 2.7 sec chord
Dynamical classification is SCATNEAR
Star training set for 434390, (2017/03/29 01:51UT) Object RA Dec mag sep mel Regulus 10:09:17.3 +11:52:56 1.3 8.55 128 53 Leo 10:50:09.7 +10:27:13 5.3 1.74 138 PPM 127623 10:42:36.1 +10:38:57 7.9 0.80 136 PPM 127662 10:45:16.1 +11:14:42 9.7 0.30 137 PPM 127647 10:44:20.1 +11:20:55 10.1 0.05 137 434390 10:44:07.3 +11:21:23 16.3 137 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 2016/03/20 17:20:05 UT
Marc W. Buie, Southwest Research Institute