Event between (181874) 99HW11 and star GA0800:04944166 with event index number of 1388702
Geocentric closest approach at 2025/04/27 18:10:30 UTC
J2000 position of star is 15:56:37.9 -08:41:10
Equinox of date position of star is 15:57:54.3 -08:45:11
Stellar brightness G=16.8,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 154 degrees from the moon.
Moon is 0% illuminated.
Apparent brightness V=23.5
Object is 46.6 AU from the Sun
and 45.6 AU from the Earth.
Apparent velocity is 23.2
km/sec on the sky relative to the star, or,
2.5 arcsec/hr.
The 1-sigma error in the time of the event is 488 seconds.
The 1-sigma cross-track error in the shadow position is
3612 km.
The object has an absolute magnitude Hv=6.8
Diameter=239.9 km assuming a 5% albedo -- 11.1 sec chord
Diameter=97.9 km assuming a 30% albedo -- 4.5 sec chord
Dynamical classification is SCATNEAR
Star training set for 181874, (2025/04/27 18:17UT) Object RA Dec mag sep mel Antares 16:30:57.9 -26:29:09 0.9 19.37 147 1Del Oph 16:15:40.5 -03:45:27 2.7 6.65 148 50 Lib 16:02:09.9 -08:28:52 5.5 1.07 153 PPM 199084 15:57:04.6 -08:43:13 7.2 0.23 154 PPM 199102 15:57:59.2 -08:58:11 9.4 0.21 154 181874 15:58:00.2 -08:45:29 16.8 153 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 181874, (2025/04/27 18:17UT) Object RA Dec mag sep mel Antares 16:29:24.4 -26:25:56 0.9 19.37 147 1Del Oph 16:14:20.7 -03:41:43 2.7 6.65 148 50 Lib 16:00:47.6 -08:24:41 5.5 1.07 153 PPM 199084 15:55:42.3 -08:38:53 7.2 0.23 154 PPM 199102 15:56:36.8 -08:53:52 9.4 0.21 154 181874 15:56:37.9 -08:41:10 16.8 154 Positions are for J2000
Event circumstances last updated at 2023/07/05 02:35:28 UT
Marc W. Buie, Southwest Research Institute