Occultation event with (3793) Leonteus, event index number 1577
Regions able to see the event: SAmericaS
Geocentric closest approach at 2025/11/24 07:46:22 UTC
J2000 position of star is 12:27:37.4 -09:58:03
Equinox of date position of star is 12:28:57.8 -10:06:38
Star is 96 degrees from the moon. Moon is 14% illuminated.
Stellar brightness G=14.8, apparent brightess of occulting body is G=14.5
Use an exposure time of 0.80 seconds with the standard RECON-QHY system.
SNR of 9.8 per integration for unocculted signal
Expected flux drop is 44% with SNR of 4.3 for the occulted depth (per occulted point)
Apparent velocity is 30.7 km/sec on the sky relative to the star, or, 27.1 arcsec/hr.
Position angle of asteroid motion is 109.6 degrees
The recommended exposure time corresponds to 24.6 km per image.
The 1-sigma error in the time of the event is 0.5 seconds.
The 1-sigma cross-track error in the shadow position is 39.1 km.
The sky-plane scale is 4079.9 km/arcsec.
Diameter estimates:
104.7 km assuming a 5% albedo, aximum of 3.4 sec for a central chord
42.8 km assuming a 30% albedo, maximum of 1.4 sec for a central chord
Cross-track diameter of 112.0 km used for deployment plan.
Star training set for 3793_Leonteus, (2025/11/24 07:46UT) Object RA Dec mag sep mel Spica 13:26:33.7 -11:17:44 1.0 14.20 83 4Gam Crv 12:17:08.5 -17:41:08 2.6 8.10 95 21 Vir 12:35:07.1 -09:35:40 5.6 1.60 95 PPM 225875 12:29:11.4 -10:18:36 8.5 0.21 96 PPM 195510 12:28:47.2 -10:06:14 9.5 0.04 96 3793_Leonteus 12:28:57.8 -10:06:38 14.5 95 Positions are for equinox of date
Star training set for 3793_Leonteus, (2025/11/24 07:46UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 14.20 83 4Gam Crv 12:15:48.1 -17:32:30 2.6 8.10 95 21 Vir 12:33:46.6 -09:27:07 5.6 1.60 95 PPM 225875 12:27:51.0 -10:10:01 8.5 0.21 96 PPM 195510 12:27:26.8 -09:57:39 9.5 0.04 96 3793_Leonteus 12:27:37.4 -09:58:03 14.5 96 Positions are for J2000