Event between (531017) 12BA155 and star GA0840:03930929 with event index number of 2439531
Geocentric closest approach at 2022/02/08 23:07:03 UTC
J2000 position of star is 10:30:01.9 -05:19:06
Equinox of date position of star is 10:31:08.7 -05:25:56
Stellar brightness G=15.8,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 106 degrees from the moon.
Moon is 54% illuminated.
TNO apparent brightness V=21.9
TNO is 38.2 AU from the Sun
and 37.3 AU from the Earth.
The TNO is moving 22.8
km/sec on the sky relative to the star, or,
3.0 arcsec/hr.
The 1-sigma error in the time of the event is 94 seconds.
The 1-sigma cross-track error in the shadow position is
1482 km.
The TNO has an absolute magnitude Hv=6.1
Diameter=356.5 km assuming a 5% albedo -- 15.7 sec chord
Diameter=145.5 km assuming a 30% albedo -- 6.4 sec chord
Dynamical classification is 5:2EEE
Star training set for 531017, (2022/02/08 23:10UT) Object RA Dec mag sep mel Regulus 10:09:32.8 +11:51:30 1.3 18.11 95 Alphard 09:28:40.4 -08:45:20 2.0 15.85 93 PPM 193464 10:29:51.2 -03:51:22 6.5 1.61 105 PPM 193533 10:34:21.8 -05:28:41 7.5 0.80 107 PPM 193496 10:31:51.5 -05:38:38 9.5 0.28 106 531017 10:31:08.8 -05:25:56 15.8 107 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 531017, (2022/02/08 23:10UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 18.11 95 Alphard 09:27:35.2 -08:39:30 2.0 15.85 93 PPM 193464 10:28:44.0 -03:44:33 6.5 1.61 105 PPM 193533 10:33:14.8 -05:21:49 7.5 0.80 107 PPM 193496 10:30:44.6 -05:31:48 9.5 0.28 106 531017 10:30:01.9 -05:19:06 15.8 106 Positions are for J2000
Event circumstances last updated at 2022/02/02 01:09:05 UT
Marc W. Buie, Southwest Research Institute