Occultation event with (18493) Demoleon, event index number 526
Regions able to see the event: Europe
Geocentric closest approach at 2025/01/28 20:08:51 UTC
J2000 position of star is 23:46:23.2 +06:26:23
Equinox of date position of star is 23:47:40.1 +06:34:45
Star is 60 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=16.0, apparent brightess of occulting body is G=16.5
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
Expected flux drop is 40% with SNR of 3.0 per integration
Apparent velocity is 32.8 km/sec on the sky relative to the star, or, 29.2 arcsec/hr.
The recommended exposure time corresponds to 18.1 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 19.9 km.
The sky-plane scale is 4042.5 km/arcsec.
Diameter estimates:
40.5 km assuming a 5% albedo, aximum of 1.2 sec for a central chord
16.6 km assuming a 30% albedo, maximum of 0.5 sec for a central chord
Cross-track diameter of 40.5 km used for deployment plan.
Star training set for 18493_Demoleon, (2025/01/28 20:09UT) Object RA Dec mag sep mel Algenib 00:14:31.8 +15:19:22 2.8 10.95 70 PPM 174347 23:43:13.4 +07:23:22 5.8 1.37 60 PPM 174390 23:46:05.8 +07:19:52 7.8 0.85 60 PPM 174397 23:46:47.0 +06:37:33 9.3 0.22 60 18493_Demoleon 23:47:40.1 +06:34:45 16.5 60 Positions are for equinox of date
Star training set for 18493_Demoleon, (2025/01/28 20:09UT) Object RA Dec mag sep mel Algenib 00:13:14.2 +15:11:00 2.8 10.95 70 PPM 174347 23:41:56.6 +07:15:01 5.8 1.37 60 PPM 174390 23:44:49.0 +07:11:30 7.8 0.85 60 PPM 174397 23:45:30.1 +06:29:11 9.3 0.22 60 18493_Demoleon 23:46:23.2 +06:26:23 16.5 60 Positions are for J2000