Event between (434390) 05CH81 and star TYC20849-00063-1 with event index number of 73985
Geocentric closest approach at 2017/03/13 17:48:16 UTC
J2000 position of star is 10:44:21.6 +11:20:08
Equinox of date position of star is 10:45:12.8 +11:15:01
Stellar brightness V=9.9
Star is 28 degrees from the moon.
Moon is 99% illuminated.
TNO apparent brightness V=24.0
TNO is 38.2 AU from the Sun
and 37.2 AU from the Earth.
The TNO is moving 23.6
km/sec on the sky relative to the star, or,
3.1 arcsec/hr.
The 1-sigma error in the time of the event is 157 seconds.
The 1-sigma cross-track error in the shadow position is
2222 km.
The TNO has an absolute magnitude Hv=8.2
Diameter=138.0 km assuming a 5% albedo -- 5.9 sec chord
Diameter=56.4 km assuming a 30% albedo -- 2.4 sec chord
Dynamical classification is SCATNEAR
Star training set for 434390, (2017/03/13 17:48UT) Object RA Dec mag sep mel Regulus 10:09:17.2 +11:52:57 1.3 8.83 37 53 Leo 10:50:09.6 +10:27:14 5.3 1.44 27 PPM 127689 10:47:30.9 +11:05:33 8.5 0.57 28 PPM 127662 10:45:15.9 +11:14:42 9.7 0.00 28 434390 10:45:15.9 +11:14:42 9.9 28 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 17:19:40 UT
Marc W. Buie, Southwest Research Institute