Event between (60558) Echeclus and star GA1080:02191650 with event index number of 2336841
Geocentric closest approach at 2021/12/17 17:16:19 UTC
J2000 position of star is 06:35:44.9 +18:33:54
Equinox of date position of star is 06:37:01.9 +18:32:45
Stellar brightness G=15.8,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 29 degrees from the moon.
Moon is 98% illuminated.
TNO apparent brightness V=19.6
TNO is 11.1 AU from the Sun
and 10.1 AU from the Earth.
The TNO is moving 21.8
km/sec on the sky relative to the star, or,
10.7 arcsec/hr.
The 1-sigma error in the time of the event is 18 seconds.
The 1-sigma cross-track error in the shadow position is
368 km.
The TNO has an absolute magnitude Hv=9.2
Diameter=88.3 km assuming a 5% albedo -- 4.1 sec chord
Diameter=36.1 km assuming a 30% albedo -- 1.7 sec chord
Dynamical classification is CENTAURR
Star training set for 60558, (2021/12/17 17:16UT) Object RA Dec mag sep mel Betelgeuse 05:56:21.7 +07:24:34 0.4 14.89 25 Alhena 06:38:58.8 +16:22:43 1.9 2.22 30 26 Gem 06:43:41.0 +17:37:19 5.3 1.83 31 PPM 122704 06:36:02.9 +18:19:58 8.4 0.32 29 PPM 122752 06:37:32.2 +18:22:24 10.9 0.21 29 60558 06:37:02.2 +18:32:44 15.8 29 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 60558, (2021/12/17 17:16UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 14.89 25 Alhena 06:37:42.8 +16:23:57 1.9 2.22 30 26 Gem 06:42:24.3 +17:38:42 5.3 1.83 31 PPM 122704 06:34:45.8 +18:21:06 8.4 0.32 29 PPM 122752 06:36:15.1 +18:23:35 10.9 0.21 29 60558 06:35:44.9 +18:33:54 15.8 29 Positions are for J2000
Event circumstances last updated at 2021/11/15 00:44:45 UT
Marc W. Buie, Southwest Research Institute