Event between (503858) 98HQ151 and star GA0780:20277992 with event index number of 2452754
Geocentric closest approach at 2025/05/28 16:00:18 UTC
J2000 position of star is 19:32:16.9 -10:42:52
Equinox of date position of star is 19:33:35.2 -10:39:45
Stellar brightness G=16.6,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 151 degrees from the moon.
Moon is 4% illuminated.
Apparent brightness V=24.2
Object is 34.1 AU from the Sun
and 33.4 AU from the Earth.
Apparent velocity is 15.7
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 383 seconds.
The 1-sigma cross-track error in the shadow position is
2413 km.
The object has an absolute magnitude Hv=8.8
Diameter=104.7 km assuming a 5% albedo -- 6.8 sec chord
Diameter=42.8 km assuming a 30% albedo -- 2.8 sec chord
Dynamical classification is 3:2E
Star training set for 503858, (2025/05/28 15:45UT) Object RA Dec mag sep mel Antares 16:30:58.2 -26:29:10 0.9 45.81 161 Nunki 18:56:50.3 -26:15:46 2.0 17.87 166 37 Aql 19:36:31.2 -10:30:11 4.7 0.71 151 PPM 236129 19:33:31.4 -11:13:09 7.9 0.56 152 PPM 236128 19:33:29.9 -10:31:33 9.3 0.14 151 503858 19:33:40.9 -10:39:31 16.6 151 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 503858, (2025/05/28 15:45UT) Object RA Dec mag sep mel Antares 16:29:24.4 -26:25:56 0.9 45.81 161 Nunki 18:55:15.9 -26:17:50 2.0 17.87 166 37 Aql 19:35:07.3 -10:33:37 4.7 0.71 151 PPM 236129 19:32:07.1 -11:16:29 7.9 0.56 152 PPM 236128 19:32:05.9 -10:34:54 9.3 0.14 151 503858 19:32:16.9 -10:42:52 16.6 151 Positions are for J2000
Event circumstances last updated at 2023/09/03 03:20:39 UT
Marc W. Buie, Southwest Research Institute