Event between (455171) 99OM4 and star GA0820:22399334 with event index number of 1124316
Geocentric closest approach at 2021/07/07 21:09:29 UTC
J2000 position of star is 23:02:28.6 -07:52:12
Equinox of date position of star is 23:03:34.3 -07:45:23
Stellar brightness G=16.6,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 98 degrees from the moon.
Moon is 4% illuminated.
TNO apparent brightness V=23.8
TNO is 45.9 AU from the Sun
and 45.4 AU from the Earth.
The TNO is moving 11.2
km/sec on the sky relative to the star, or,
1.2 arcsec/hr.
The 1-sigma error in the time of the event is 940 seconds.
The 1-sigma cross-track error in the shadow position is
4937 km.
The TNO has an absolute magnitude Hv=7.1
Diameter=229.1 km assuming a 5% albedo -- 20.5 sec chord
Diameter=93.5 km assuming a 30% albedo -- 8.4 sec chord
Dynamical classification is CLASSICAL
Star training set for 455171, (2021/07/07 21:09UT) Object RA Dec mag sep mel Fomalhaut 22:58:50.1 -29:30:28 1.2 21.78 107 81 Aqr 23:02:30.7 -06:56:43 6.1 0.85 98 PPM 207103 23:05:02.0 -07:56:33 8.3 0.40 98 PPM 207082 23:03:52.8 -07:42:28 9.7 0.08 98 455171 23:03:35.7 -07:45:14 16.6 98 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 455171, (2021/07/07 21:09UT) Object RA Dec mag sep mel Fomalhaut 22:57:39.6 -29:37:24 1.2 21.78 107 81 Aqr 23:01:23.6 -07:03:40 6.1 0.85 98 PPM 207103 23:03:54.9 -08:03:31 8.3 0.40 98 PPM 207082 23:02:45.7 -07:49:26 9.7 0.08 98 455171 23:02:28.6 -07:52:12 16.6 98 Positions are for J2000
Event circumstances last updated at 2021/01/23 20:30:31 UT
Marc W. Buie, Southwest Research Institute