Event between (553138) 11BQ170 and star GA0840:04082820 with event index number of 2225904
Geocentric closest approach at 2021/12/19 01:02:02 UTC
J2000 position of star is 11:52:10.0 -04:04:55
Equinox of date position of star is 11:53:16.9 -04:12:11
Stellar brightness G=16.8,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 94 degrees from the moon.
Moon is 100% illuminated.
TNO apparent brightness V=22.4
TNO is 37.9 AU from the Sun
and 38.0 AU from the Earth.
The TNO is moving 6.7
km/sec on the sky relative to the star, or,
0.9 arcsec/hr.
The 1-sigma error in the time of the event is 587 seconds.
The 1-sigma cross-track error in the shadow position is
3014 km.
The TNO has an absolute magnitude Hv=6.4
Diameter=313.3 km assuming a 5% albedo -- 46.7 sec chord
Diameter=127.9 km assuming a 30% albedo -- 19.1 sec chord
Dynamical classification is CLASSICAL
Star training set for 553138, (2021/12/19 01:02UT) Object RA Dec mag sep mel Spica 13:26:21.2 -11:16:31 1.0 24.10 118 4Gam Crv 12:16:56.3 -17:39:50 2.6 14.65 105 PPM 194890 11:52:09.7 -05:27:20 5.6 1.28 95 PPM 194933 11:54:35.0 -04:00:22 8.1 0.38 94 PPM 194909 11:53:03.2 -03:59:26 10.0 0.22 94 553138 11:53:17.5 -04:12:15 16.8 95 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 553138, (2021/12/19 01:02UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 24.10 118 4Gam Crv 12:15:48.1 -17:32:30 2.6 14.65 105 PPM 194890 11:51:02.2 -05:20:00 5.6 1.28 95 PPM 194933 11:53:27.5 -03:53:01 8.1 0.38 94 PPM 194909 11:51:55.7 -03:52:06 10.0 0.22 94 553138 11:52:10.0 -04:04:55 16.8 94 Positions are for J2000
Event circumstances last updated at 2021/10/12 02:02:15 UT
Marc W. Buie, Southwest Research Institute