Event between (469421) 01XD255 and star GA1140:03180000 with event index number of 2252185
Geocentric closest approach at 2025/04/17 12:07:36 UTC
J2000 position of star is 09:30:32.0 +25:06:47
Equinox of date position of star is 09:31:55.5 +25:00:21
Stellar brightness G=15.9,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 120 degrees from the moon.
Moon is 83% illuminated.
Apparent brightness V=21.7
Object is 38.0 AU from the Sun
and 37.7 AU from the Earth.
Apparent velocity is 6.6
km/sec on the sky relative to the star, or,
0.9 arcsec/hr.
The 1-sigma error in the time of the event is 264 seconds.
The 1-sigma cross-track error in the shadow position is
1370 km.
The object has an absolute magnitude Hv=5.8
Diameter=420.7 km assuming a 5% albedo -- 64.0 sec chord
Diameter=171.8 km assuming a 30% albedo -- 26.1 sec chord
Dynamical classification is 3:2E
Star training set for 469421, (2025/04/17 12:07UT) Object RA Dec mag sep mel Regulus 10:09:43.0 +11:50:33 1.3 15.90 107 1Kap Leo 09:26:07.3 +26:04:19 4.5 1.70 122 PPM 099579 09:27:38.3 +25:27:54 8.5 1.09 121 PPM 099653 09:33:18.8 +24:51:02 9.2 0.34 120 PPM 099623 09:31:49.0 +24:59:59 10.4 0.04 120 469421 09:31:59.3 +25:00:03 15.9 120 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 469421, (2025/04/17 12:07UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 15.90 107 1Kap Leo 09:24:39.2 +26:10:55 4.5 1.70 122 PPM 099579 09:26:10.6 +25:34:32 8.5 1.09 121 PPM 099653 09:31:51.6 +24:57:48 9.2 0.34 120 PPM 099623 09:30:21.6 +25:06:42 10.4 0.04 120 469421 09:30:32.0 +25:06:47 15.9 120 Positions are for J2000
Event circumstances last updated at 2024/03/04 05:31:53 UT
Marc W. Buie, Southwest Research Institute