Event between (19521) Chaos and star GA1200:01894283 with event index number of 1029790
Geocentric closest approach at 2020/12/10 18:43:47 UTC
J2000 position of star is 05:45:56.3 +30:51:20
Equinox of date position of star is 05:47:17.3 +30:51:44
Stellar brightness G=16.9,
use SENSEUP=128
Star is 118 degrees from the moon.
Moon is 20% illuminated.
TNO apparent brightness V=20.9
TNO is 41.2 AU from the Sun
and 40.3 AU from the Earth.
The TNO is moving 25.2
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 367 seconds.
The 1-sigma cross-track error in the shadow position is
2451 km.
The TNO has an absolute magnitude Hv=4.8
Diameter=660.7 km assuming a 5% albedo -- 26.2 sec chord
Diameter=269.7 km assuming a 30% albedo -- 10.7 sec chord
Dynamical classification is CLASSICAL
Star training set for 19521, (2020/12/10 18:44UT) Object RA Dec mag sep mel Aldebaran 04:37:07.5 +16:32:59 0.8 21.46 136 Alnath 05:27:37.1 +28:37:23 1.6 4.82 122 PPM 070700 05:41:57.3 +31:22:04 5.9 1.25 119 PPM 070785 05:45:51.9 +30:29:45 8.4 0.48 118 PPM 070837 05:48:31.1 +30:39:44 9.4 0.33 117 PPM 070826 05:47:50.1 +30:46:57 10.3 0.14 118 19521 05:47:17.3 +30:51:44 16.9 117 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, (2020/12/10 18:44UT) Object RA Dec mag sep mel Aldebaran 04:35:55.3 +16:30:29 0.8 21.46 136 Alnath 05:26:17.5 +28:36:23 1.6 4.82 122 PPM 070700 05:40:35.9 +31:21:29 5.9 1.25 119 PPM 070785 05:44:31.1 +30:29:18 8.4 0.48 118 PPM 070837 05:47:10.2 +30:39:21 9.4 0.33 117 PPM 070826 05:46:29.0 +30:46:34 10.3 0.14 118 19521 05:45:56.3 +30:51:20 16.9 118 Positions are for J2000
Event circumstances last updated at 2020/12/04 19:30:09 UT
Marc W. Buie, Southwest Research Institute