Event between (24978) 98HJ151 and star GA0640:18660618 with event index number of 1390059
Geocentric closest approach at 2025/05/21 22:44:00 UTC
J2000 position of star is 17:42:22.6 -24:46:54
Equinox of date position of star is 17:43:44.8 -24:47:26
Stellar brightness G=15.8,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 84 degrees from the moon.
Moon is 34% illuminated.
TNO apparent brightness V=23.9
TNO is 43.1 AU from the Sun
and 42.2 AU from the Earth.
The TNO is moving 22.0
km/sec on the sky relative to the star, or,
2.6 arcsec/hr.
The 1-sigma error in the time of the event is 2810 seconds.
The 1-sigma cross-track error in the shadow position is
5330 km.
The TNO has an absolute magnitude Hv=7.5
Diameter=190.6 km assuming a 5% albedo -- 8.7 sec chord
Diameter=77.8 km assuming a 30% albedo -- 3.5 sec chord
Dynamical classification is CLASSICAL
Star training set for 24978, (2025/05/21 22:44UT) Object RA Dec mag sep mel Antares 16:30:58.1 -26:29:10 0.9 16.52 100 35Eta Oph 17:11:50.2 -15:45:16 2.6 11.75 92 PPM 267309 17:49:17.7 -22:29:06 6.1 2.61 82 PPM 267136 17:42:22.9 -23:50:51 8.2 1.01 84 PPM 267167 17:44:03.0 -25:00:28 9.3 0.22 84 24978 17:43:56.3 -24:47:31 15.8 83 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 24978, (2025/05/21 22:44UT) Object RA Dec mag sep mel Antares 16:29:24.4 -26:25:56 0.9 16.52 100 35Eta Oph 17:10:22.7 -15:43:29 2.6 11.75 92 PPM 267309 17:47:45.6 -22:28:40 6.1 2.61 82 PPM 267136 17:40:49.9 -23:50:10 8.2 1.01 84 PPM 267167 17:42:29.2 -24:59:50 9.3 0.22 84 24978 17:42:22.6 -24:46:54 15.8 84 Positions are for J2000
Event circumstances last updated at 2022/04/08 04:01:44 UT
Marc W. Buie, Southwest Research Institute