Event between (455171) 99OM4 and star GA0820:22413608 with event index number of 2288903
Geocentric closest approach at 2023/07/23 16:03:09 UTC
J2000 position of star is 23:10:38.4 -07:05:14
Equinox of date position of star is 23:11:50.9 -06:57:38
Stellar brightness G=15.9,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 161 degrees from the moon.
Moon is 29% illuminated.
Apparent brightness V=23.6
Object is 46.2 AU from the Sun
and 45.4 AU from the Earth.
Apparent velocity is 16.3
km/sec on the sky relative to the star, or,
1.8 arcsec/hr.
The 1-sigma error in the time of the event is 810 seconds.
The 1-sigma cross-track error in the shadow position is
5668 km.
The object has an absolute magnitude Hv=6.9
Diameter=229.1 km assuming a 5% albedo -- 15.1 sec chord
Diameter=93.5 km assuming a 30% albedo -- 6.2 sec chord
Dynamical classification is CLASSICAL
Star training set for 455171, (2023/07/23 16:03UT) Object RA Dec mag sep mel Fomalhaut 22:58:56.8 -29:29:49 1.2 22.74 144 Markab 23:05:56.2 +15:19:57 2.5 22.34 156 92Chi Aqr 23:18:04.1 -07:35:52 4.2 1.67 162 PPM 207212 23:10:24.8 -07:11:11 8.0 0.43 160 PPM 207225 23:11:02.3 -06:57:43 8.8 0.20 161 455171 23:11:51.7 -06:57:32 15.9 161 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, (2023/07/23 16:03UT) Object RA Dec mag sep mel Fomalhaut 22:57:39.6 -29:37:24 1.2 22.74 144 Markab 23:04:45.8 +15:12:18 2.5 22.34 156 92Chi Aqr 23:16:50.9 -07:43:36 4.2 1.67 162 PPM 207212 23:09:11.5 -07:18:52 8.0 0.43 160 PPM 207225 23:09:49.0 -07:05:24 8.8 0.20 161 455171 23:10:38.4 -07:05:14 15.9 161 Positions are for J2000
Event circumstances last updated at 2023/04/19 02:42:12 UT
Marc W. Buie, Southwest Research Institute