Occultation event with (15436) Dexius, event index number 729
Regions able to see the event: SAfrica
Geocentric closest approach at 2025/02/27 18:25:06 UTC
J2000 position of star is 09:01:57.1 -02:32:56
Equinox of date position of star is 09:03:13.4 -02:38:57
Star is 153 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=12.5, apparent brightess of occulting body is G=14.0
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
Expected flux drop is 20% with SNR of 14.4 per integration
Apparent velocity is 15.3 km/sec on the sky relative to the star, or, 17.9 arcsec/hr.
The recommended exposure time corresponds to 1.8 km per image.
The 1-sigma error in the time of the event is 2.3 seconds.
The 1-sigma cross-track error in the shadow position is 18.7 km.
The sky-plane scale is 3060.6 km/arcsec.
Diameter estimates:
89.9 km assuming a 5% albedo, aximum of 5.9 sec for a central chord
36.7 km assuming a 30% albedo, maximum of 2.4 sec for a central chord
Cross-track diameter of 89.9 km used for deployment plan.
Star training set for 15436_Dexius, (2025/02/27 18:25UT) Object RA Dec mag sep mel Regulus 10:09:42.6 +11:50:36 1.3 21.98 174 Alphard 09:28:49.4 -08:46:08 2.0 8.83 154 14 Hya 08:50:37.5 -03:32:16 5.3 3.27 150 PPM 177717 09:03:40.5 -02:27:59 7.4 0.21 154 PPM 177715 09:03:21.0 -02:43:48 8.9 0.09 153 15436_Dexius 09:03:13.4 -02:38:57 14.0 154 Positions are for equinox of date
Star training set for 15436_Dexius, (2025/02/27 18:25UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 21.98 174 Alphard 09:27:35.2 -08:39:30 2.0 8.83 154 14 Hya 08:49:21.7 -03:26:36 5.3 3.27 150 PPM 177717 09:02:24.1 -02:21:58 7.4 0.21 154 PPM 177715 09:02:04.7 -02:37:47 8.9 0.09 153 15436_Dexius 09:01:57.1 -02:32:56 14.0 153 Positions are for J2000