Event between (503883) 01QF331 and star GA0980:00166716 with event index number of 1141390
Geocentric closest approach at 2021/07/04 06:53:26 UTC
J2000 position of star is 01:56:52.4 +09:43:16
Equinox of date position of star is 01:58:00.6 +09:49:30
Stellar brightness G=14.7,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 9 degrees from the moon.
Moon is 28% illuminated.
TNO apparent brightness V=23.0
TNO is 31.9 AU from the Sun
and 32.2 AU from the Earth.
The TNO is moving 15.2
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 229 seconds.
The 1-sigma cross-track error in the shadow position is
2052 km.
The TNO has an absolute magnitude Hv=7.8
Diameter=166.0 km assuming a 5% albedo -- 10.9 sec chord
Diameter=67.8 km assuming a 30% albedo -- 4.5 sec chord
Dynamical classification is 5:3EE
Star training set for 503883, (2021/07/04 06:53UT) Object RA Dec mag sep mel Aldebaran 04:37:09.4 +16:33:03 0.8 39.25 31 6Bet Ari 01:55:49.9 +20:54:44 2.6 11.10 12 PPM 117718 01:52:00.6 +11:08:56 6.0 1.98 10 PPM 145099 01:55:20.6 +10:03:19 8.4 0.70 9 PPM 145144 01:57:54.5 +09:34:04 9.8 0.26 9 PPM 145158 01:58:36.0 +09:59:30 10.8 0.22 8 503883 01:58:01.0 +09:49:32 14.7 8 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 503883, (2021/07/04 06:53UT) Object RA Dec mag sep mel Aldebaran 04:35:55.3 +16:30:29 0.8 39.25 31 6Bet Ari 01:54:38.5 +20:48:26 2.6 11.10 12 PPM 117718 01:50:51.9 +11:02:35 6.0 1.98 10 PPM 145099 01:54:12.1 +09:57:01 8.4 0.70 9 PPM 145144 01:56:46.0 +09:27:49 9.8 0.26 9 PPM 145158 01:57:27.4 +09:53:15 10.8 0.22 8 503883 01:56:52.4 +09:43:16 14.7 9 Positions are for J2000
Event circumstances last updated at 2021/05/21 01:06:36 UT
Marc W. Buie, Southwest Research Institute