Event between (19521) Chaos and star GA1200:01681001 with event index number of 353079
Geocentric closest approach at 2018/12/25 15:37:10 UTC
J2000 position of star is 05:31:20.3 +30:15:06
Equinox of date position of star is 05:32:32.7 +30:15:52
Stellar brightness G=14.7,
use SENSEUP=128
Star is 50 degrees from the moon.
Moon is 88% illuminated.
TNO apparent brightness V=20.9
TNO is 41.3 AU from the Sun
and 40.3 AU from the Earth.
The TNO is moving 25.1
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 537 seconds.
The 1-sigma cross-track error in the shadow position is
3560 km.
The TNO has an absolute magnitude Hv=4.8
Diameter=660.7 km assuming a 5% albedo -- 26.4 sec chord
Diameter=269.7 km assuming a 30% albedo -- 10.8 sec chord
Dynamical classification is CLASSICAL
Star training set for 19521, (2018/12/25 15:37UT) Object RA Dec mag sep mel Aldebaran 04:37:00.7 +16:32:45 0.8 18.69 64 Alnath 05:27:29.6 +28:37:18 1.6 1.98 51 25Chi Aur 05:33:57.9 +32:12:15 4.8 1.96 50 PPM 094418 05:31:18.8 +29:33:43 8.2 0.75 51 PPM 070490 05:32:26.5 +30:11:25 10.0 0.08 50 19521 05:32:33.3 +30:15:52 14.7 50 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, (2018/12/25 15:37UT) Object RA Dec mag sep mel Aldebaran 04:35:55.3 +16:30:30 0.8 18.69 64 Alnath 05:26:17.5 +28:36:23 1.6 1.98 51 25Chi Aur 05:32:43.7 +32:11:31 4.8 1.96 50 PPM 094418 05:30:06.1 +29:32:54 8.2 0.75 51 PPM 070490 05:31:13.5 +30:10:38 10.0 0.08 50 19521 05:31:20.3 +30:15:06 14.7 50 Positions are for J2000
Event circumstances last updated at 2018/10/23 20:47:46 UT
Marc W. Buie, Southwest Research Institute