Event between 12XR157 and star GA0940:00773156 with event index number of 2034987
Geocentric closest approach at 2021/08/22 16:50:25 UTC
J2000 position of star is 05:30:36.1 +04:10:02
Equinox of date position of star is 05:31:43.9 +04:10:56
Stellar brightness G=15.4,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 107 degrees from the moon.
Moon is 100% illuminated.
TNO apparent brightness V=22.5
TNO is 40.1 AU from the Sun
and 40.5 AU from the Earth.
The TNO is moving 19.1
km/sec on the sky relative to the star, or,
2.3 arcsec/hr.
The 1-sigma error in the time of the event is 142 seconds.
The 1-sigma cross-track error in the shadow position is
2221 km.
The TNO has an absolute magnitude Hv=6.3
Diameter=337.3 km assuming a 5% albedo -- 17.7 sec chord
Diameter=137.7 km assuming a 30% albedo -- 7.2 sec chord
Dynamical classification is 2:1E
Star training set for 12XR157, (2021/08/22 16:50UT) Object RA Dec mag sep mel Betelgeuse 05:56:20.6 +07:24:34 0.4 6.92 114 Bellatrix 05:26:17.6 +06:22:03 1.6 2.57 106 30Psi2Ori 05:27:58.3 +03:06:46 4.3 1.43 106 PPM 149045 05:31:28.6 +04:13:12 7.4 0.08 107 12XR157 05:31:44.8 +04:10:56 15.4 107 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 12XR157, (2021/08/22 16:50UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 6.92 114 Bellatrix 05:25:07.8 +06:20:58 1.6 2.57 106 30Psi2Ori 05:26:50.2 +03:05:44 4.3 1.43 106 PPM 149045 05:30:20.0 +04:12:17 7.4 0.08 107 12XR157 05:30:36.1 +04:10:02 15.4 107 Positions are for J2000
Event circumstances last updated at 2021/05/19 01:06:22 UT
Marc W. Buie, Southwest Research Institute