Occultation event with (15436) Dexius, event index number 1630
Regions able to see the event: US
Geocentric closest approach at 2025/12/02 13:20:26 UTC
J2000 position of star is 11:26:54.7 -13:27:07
Equinox of date position of star is 11:28:13.2 -13:35:41
Star is 140 degrees from the moon. Moon is 91% illuminated.
Stellar brightness G=15.3, apparent brightess of occulting body is G=14.8
Use an exposure time of 0.95 seconds with the standard RECON-QHY system.
SNR of 7.5 per integration for unocculted signal
Expected flux drop is 40% with SNR of 3.0 for the occulted depth (per occulted point)
Apparent velocity is 22.6 km/sec on the sky relative to the star, or, 20.7 arcsec/hr.
Position angle of asteroid motion is 131.8 degrees
The recommended exposure time corresponds to 21.5 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 19.5 km.
The sky-plane scale is 3926.3 km/arcsec.
Diameter estimates:
90.4 km assuming a 5% albedo, aximum of 4.0 sec for a central chord
36.9 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 87.6 km used for deployment plan.
Star training set for 15436_Dexius, (2025/12/02 13:20UT) Object RA Dec mag sep mel Spica 13:26:33.7 -11:17:45 1.0 28.96 167 4Gam Crv 12:17:08.6 -17:41:09 2.6 12.46 153 16Kap Crt 11:28:28.0 -12:29:58 5.9 1.10 140 PPM 224432 11:28:54.8 -13:14:56 8.2 0.38 141 PPM 224414 11:28:14.5 -13:32:08 9.5 0.06 140 15436_Dexius 11:28:13.2 -13:35:41 14.8 141 Positions are for equinox of date
Star training set for 15436_Dexius, (2025/12/02 13:20UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 28.96 167 4Gam Crv 12:15:48.1 -17:32:30 2.6 12.46 153 16Kap Crt 11:27:09.4 -12:21:24 5.9 1.10 140 PPM 224432 11:27:36.2 -13:06:22 8.2 0.38 141 PPM 224414 11:26:56.0 -13:23:34 9.5 0.06 140 15436_Dexius 11:26:54.7 -13:27:07 14.8 140 Positions are for J2000