Event between (19521) Chaos and star GA1200:02139017 with event index number of 1253662
Geocentric closest approach at 2022/12/25 16:35:33 UTC
J2000 position of star is 05:57:57.7 +31:22:50
Equinox of date position of star is 05:59:19.5 +31:22:52
Stellar brightness G=16.5,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 144 degrees from the moon.
Moon is 8% illuminated.
TNO apparent brightness V=20.9
TNO is 41.2 AU from the Sun
and 40.2 AU from the Earth.
The TNO is moving 25.4
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 337 seconds.
The 1-sigma cross-track error in the shadow position is
2512 km.
The TNO has an absolute magnitude Hv=4.8
Diameter=660.7 km assuming a 5% albedo -- 26.0 sec chord
Diameter=269.7 km assuming a 30% albedo -- 10.6 sec chord
Dynamical classification is CLASSICAL
Star training set for 19521, (2022/12/25 16:36UT) Object RA Dec mag sep mel Pollux 07:46:43.2 +27:58:08 1.1 23.49 167 Alnath 05:27:44.8 +28:37:29 1.6 7.39 137 PPM 071002 05:56:28.6 +31:42:10 5.9 0.71 143 PPM 071093 06:01:49.4 +31:56:24 7.9 0.75 144 PPM 071032 05:58:26.7 +31:01:20 9.6 0.42 144 PPM 071041 05:58:50.7 +31:14:34 10.8 0.19 144 19521 05:59:27.1 +31:22:52 16.5 144 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 19521, (2022/12/25 16:36UT) Object RA Dec mag sep mel Pollux 07:45:17.9 +28:01:33 1.1 23.49 167 Alnath 05:26:17.5 +28:36:23 1.6 7.39 137 PPM 071002 05:54:58.9 +31:42:02 5.9 0.71 143 PPM 071093 06:00:19.6 +31:56:26 7.9 0.75 144 PPM 071032 05:56:57.6 +31:01:16 9.6 0.42 144 PPM 071041 05:57:21.4 +31:14:31 10.8 0.19 144 19521 05:57:57.7 +31:22:50 16.5 144 Positions are for J2000
Event circumstances last updated at 2021/01/15 20:16:23 UT
Marc W. Buie, Southwest Research Institute