Event between 99HV11 and star GA0740:05423419 with event index number of 1138151
Geocentric closest approach at 2021/06/20 02:28:10 UTC
J2000 position of star is 15:18:53.5 -15:09:04
Equinox of date position of star is 15:20:05.2 -15:13:40
Stellar brightness G=16.0,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 27 degrees from the moon.
Moon is 71% illuminated.
TNO apparent brightness V=24.1
TNO is 43.9 AU from the Sun
and 43.1 AU from the Earth.
The TNO is moving 18.9
km/sec on the sky relative to the star, or,
2.2 arcsec/hr.
The 1-sigma error in the time of the event is 1086 seconds.
The 1-sigma cross-track error in the shadow position is
5344 km.
The TNO has an absolute magnitude Hv=7.6
Diameter=181.1 km assuming a 5% albedo -- 9.6 sec chord
Diameter=74.0 km assuming a 30% albedo -- 3.9 sec chord
Dynamical classification is CLASSICAL
Star training set for 99HV11, (2021/06/20 02:28UT) Object RA Dec mag sep mel Antares 16:30:43.6 -26:28:40 0.9 19.93 46 27Bet Lib 15:18:09.9 -09:27:39 2.6 5.79 25 32Zet1Lib 15:29:28.3 -16:47:24 5.6 2.74 30 PPM 230110 15:22:09.2 -15:27:00 7.6 0.54 28 PPM 230045 15:19:48.3 -15:06:55 9.9 0.13 27 99HV11 15:20:05.4 -15:13:41 16.0 27 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 99HV11, (2021/06/20 02:28UT) Object RA Dec mag sep mel Antares 16:29:24.4 -26:25:56 0.9 19.93 46 27Bet Lib 15:17:00.3 -09:22:59 2.6 5.79 25 32Zet1Lib 15:28:15.4 -16:43:00 5.6 2.74 30 PPM 230110 15:20:57.1 -15:22:26 7.6 0.54 28 PPM 230045 15:18:36.4 -15:02:18 9.9 0.13 27 99HV11 15:18:53.5 -15:09:04 16.0 27 Positions are for J2000
Event circumstances last updated at 2021/05/22 00:51:44 UT
Marc W. Buie, Southwest Research Institute