Occultation event with (15436) Dexius, event index number 1037
Regions able to see the event: Australia
Geocentric closest approach at 2025/06/07 10:51:05 UTC
J2000 position of star is 09:14:18.7 +00:21:46
Equinox of date position of star is 09:15:37.0 +00:15:23
Star is 73 degrees from the moon. Moon is 87% illuminated.
Stellar brightness G=10.9, apparent brightess of occulting body is G=14.9
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 39.6 per integration for unocculted signal
Expected flux drop is 98% with SNR of 38.6 for the occulted depth (per occulted point)
Apparent velocity is 26.1 km/sec on the sky relative to the star, or, 23.6 arcsec/hr.
Position angle of asteroid motion is 353.2 degrees
The recommended exposure time corresponds to 3.1 km per image.
The 1-sigma error in the time of the event is 1.4 seconds.
The 1-sigma cross-track error in the shadow position is 16.7 km.
The sky-plane scale is 3985.4 km/arcsec.
Diameter estimates:
90.4 km assuming a 5% albedo, aximum of 3.5 sec for a central chord
36.9 km assuming a 30% albedo, maximum of 1.4 sec for a central chord
Cross-track diameter of 90.4 km used for deployment plan.
Star training set for 15436_Dexius, (2025/06/07 10:51UT) Object RA Dec mag sep mel Regulus 10:09:43.4 +11:50:31 1.3 17.73 64 Alphard 09:28:50.2 -08:46:12 2.0 9.61 67 22The Hya 09:15:41.2 +02:12:20 3.9 1.95 74 PPM 177782 09:15:10.6 -00:17:36 8.3 0.56 73 PPM 155588 09:15:30.6 +00:12:26 9.1 0.06 73 15436_Dexius 09:15:37.0 +00:15:23 14.9 73 Positions are for equinox of date
Star training set for 15436_Dexius, (2025/06/07 10:51UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 17.73 64 Alphard 09:27:35.2 -08:39:30 2.0 9.61 67 22The Hya 09:14:22.1 +02:18:43 3.9 1.95 74 PPM 177782 09:13:52.5 -00:11:14 8.3 0.56 73 PPM 155588 09:14:12.2 +00:18:49 9.1 0.06 73 15436_Dexius 09:14:18.7 +00:21:46 14.9 73 Positions are for J2000