Event between (181874) 99HW11 and star GA0800:04811897 with event index number of 1106328
Geocentric closest approach at 2021/05/29 19:27:35 UTC
J2000 position of star is 15:34:47.8 -08:34:20
Equinox of date position of star is 15:35:57.0 -08:38:33
Stellar brightness G=16.6,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 63 degrees from the moon.
Moon is 85% illuminated.
TNO apparent brightness V=23.6
TNO is 45.7 AU from the Sun
and 44.7 AU from the Earth.
The TNO is moving 24.0
km/sec on the sky relative to the star, or,
2.7 arcsec/hr.
The 1-sigma error in the time of the event is 324 seconds.
The 1-sigma cross-track error in the shadow position is
2266 km.
The TNO has an absolute magnitude Hv=7.0
Diameter=239.9 km assuming a 5% albedo -- 10.0 sec chord
Diameter=97.9 km assuming a 30% albedo -- 4.1 sec chord
Dynamical classification is SCATNEAR
Star training set for 181874, (2021/05/29 19:28UT) Object RA Dec mag sep mel Antares 16:30:43.4 -26:28:40 0.9 22.06 45 27Bet Lib 15:18:09.7 -09:27:38 2.6 4.47 66 PPM 198725 15:35:36.0 -09:15:15 5.6 0.62 63 PPM 198753 15:37:00.0 -09:02:32 8.5 0.48 62 PPM 198720 15:35:26.0 -08:31:14 9.5 0.18 63 181874 15:35:57.1 -08:38:33 16.6 62 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, (2021/05/29 19:28UT) Object RA Dec mag sep mel Antares 16:29:24.4 -26:25:56 0.9 22.06 45 27Bet Lib 15:17:00.3 -09:22:59 2.6 4.47 66 PPM 198725 15:34:26.4 -09:11:01 5.6 0.62 63 PPM 198753 15:35:50.5 -08:58:20 8.5 0.48 62 PPM 198720 15:34:16.8 -08:27:00 9.5 0.18 63 181874 15:34:47.8 -08:34:20 16.6 63 Positions are for J2000
Event circumstances last updated at 2021/05/20 01:09:40 UT
Marc W. Buie, Southwest Research Institute