Event between 12GX17 and star GA0780:04460965 with event index number of 2154994
Geocentric closest approach at 2021/12/25 20:46:08 UTC
J2000 position of star is 13:56:30.0 -11:35:31
Equinox of date position of star is 13:57:40.4 -11:41:54
Stellar brightness G=16.0,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 42 degrees from the moon.
Moon is 63% illuminated.
TNO apparent brightness V=23.4
TNO is 34.8 AU from the Sun
and 35.3 AU from the Earth.
The TNO is moving 17.6
km/sec on the sky relative to the star, or,
2.5 arcsec/hr.
The 1-sigma error in the time of the event is 471 seconds.
The 1-sigma cross-track error in the shadow position is
4073 km.
The TNO has an absolute magnitude Hv=7.8
Diameter=166.0 km assuming a 5% albedo -- 9.5 sec chord
Diameter=67.8 km assuming a 30% albedo -- 3.9 sec chord
Dynamical classification is CENTAURR
Star training set for 12GX17, (2021/12/25 20:46UT) Object RA Dec mag sep mel Spica 13:26:21.3 -11:16:31 1.0 7.68 35 86 Vir 13:47:06.8 -12:32:09 5.1 2.71 40 PPM 227990 13:55:18.5 -11:48:09 7.4 0.59 42 PPM 228031 13:57:04.1 -11:42:41 9.7 0.15 42 12GX17 13:57:40.6 -11:41:55 16.0 42 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 12GX17, (2021/12/25 20:46UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 7.68 35 86 Vir 13:45:56.3 -12:25:35 5.1 2.71 40 PPM 227990 13:54:07.9 -11:41:43 7.4 0.59 42 PPM 228031 13:55:53.6 -11:36:16 9.7 0.15 42 12GX17 13:56:30.0 -11:35:31 16.0 42 Positions are for J2000
Event circumstances last updated at 2021/12/04 02:02:21 UT
Marc W. Buie, Southwest Research Institute