Occultation event with (15436) Dexius, event index number 3458
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/03/18 04:19:54 UTC
J2000 position of star is 11:12:48.2 -16:12:07
Equinox of date position of star is 11:14:06.8 -16:20:42
Star is 159 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=15.6, apparent brightess of occulting body is G=14.0
Use an exposure time of 1.25 seconds with the standard RECON-QHY system.
SNR of 5.7 per integration for unocculted signal
Expected flux drop is 19% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 17.0 km/sec on the sky relative to the star, or, 19.7 arcsec/hr.
Position angle of asteroid motion is 117.4 degrees
The recommended exposure time corresponds to 21.3 km per image.
The 1-sigma error in the time of the event is 1.9 seconds.
The 1-sigma cross-track error in the shadow position is 28.1 km.
The sky-plane scale is 3118.0 km/arcsec.
Diameter estimates:
90.4 km assuming a 5% albedo, maximum of 5.3 sec for a central chord
36.9 km assuming a 30% albedo, maximum of 2.2 sec for a central chord
Cross-track diameter of 87.6 km used for deployment plan.
Star training set for 15436_Dexius, (2026/03/18 04:20UT) Object RA Dec mag sep mel Regulus 10:09:45.9 +11:50:17 1.3 32.36 163 4Gam Crv 12:17:09.5 -17:41:14 2.6 15.13 152 12Del Crt 11:20:39.2 -14:55:15 3.6 2.12 160 PPM 224123 11:15:29.0 -17:01:44 7.2 0.76 158 PPM 224061 11:13:18.6 -16:07:23 9.5 0.29 159 15436_Dexius 11:14:06.8 -16:20:42 14.0 159 Positions are for equinox of date
Star training set for 15436_Dexius, (2026/03/18 04:20UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 32.36 163 4Gam Crv 12:15:48.1 -17:32:30 2.6 15.13 152 12Del Crt 11:19:20.2 -14:46:38 3.6 2.12 160 PPM 224123 11:14:10.5 -16:53:09 7.2 0.76 158 PPM 224061 11:12:00.1 -15:58:49 9.5 0.29 159 15436_Dexius 11:12:48.2 -16:12:07 14.0 159 Positions are for J2000