Event between 04LR31 and star UC4-423-140463 with event index number of 162035
Geocentric closest approach at 2018/05/13 03:14:57 UTC
J2000 position of star is 22:50:00.7 -05:32:27
Equinox of date position of star is 22:50:57.9 -05:26:36
Stellar brightness R=15.0,
use SENSEUP=128
Star is 40 degrees from the moon.
Moon is 7% illuminated.
TNO apparent brightness V=22.0
TNO is 17.5 AU from the Sun
and 17.8 AU from the Earth.
The TNO is moving 17.3
km/sec on the sky relative to the star, or,
4.8 arcsec/hr.
The 1-sigma error in the time of the event is 112 seconds.
The 1-sigma cross-track error in the shadow position is
968 km.
The TNO has an absolute magnitude Hv=9.2
Diameter=86.7 km assuming a 5% albedo -- 5.0 sec chord
Diameter=35.4 km assuming a 30% albedo -- 2.0 sec chord
Dynamical classification is CENTAURR
Star training set for 04LR31, (2018/05/13 03:15UT) Object RA Dec mag sep mel Fomalhaut 22:58:39.7 -29:31:28 1.2 24.15 49 Markab 23:05:40.6 +15:18:16 2.5 21.07 37 PPM 206927 22:56:08.0 -04:53:23 5.7 1.40 39 PPM 206793 22:49:15.0 -05:40:12 8.3 0.48 41 PPM 206823 22:50:47.5 -05:12:21 9.5 0.24 40 04LR31 22:50:57.9 -05:26:36 15.0 40 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 04LR31, (2018/05/13 03:15UT) Object RA Dec mag sep mel Fomalhaut 22:57:39.5 -29:37:23 1.2 24.15 49 Markab 23:04:45.7 +15:12:18 2.5 21.07 37 PPM 206927 22:55:11.0 -04:59:17 5.7 1.40 39 PPM 206793 22:48:17.8 -05:46:03 8.3 0.48 41 PPM 206823 22:49:50.4 -05:18:12 9.5 0.24 40 04LR31 22:50:00.7 -05:32:27 15.0 40 Positions are for J2000
Event circumstances last updated at 2018/05/12 16:28:51 UT
Marc W. Buie, Southwest Research Institute