Occultation event with (6545) Leitus, event index number 1085
Regions able to see the event: US
Geocentric closest approach at 2025/06/22 02:34:44 UTC
J2000 position of star is 10:48:24.7 -04:41:57
Equinox of date position of star is 10:49:42.2 -04:50:04
Star is 121 degrees from the moon. Moon is 15% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 4.1 per integration for unocculted signal
Expected flux drop is 54% with SNR of 2.2 for the occulted depth (per occulted point)
Apparent velocity is 20.9 km/sec on the sky relative to the star, or, 19.1 arcsec/hr.
Position angle of asteroid motion is 357.3 degrees
The recommended exposure time corresponds to 13.6 km per image.
The 1-sigma error in the time of the event is 2.2 seconds.
The 1-sigma cross-track error in the shadow position is 23.9 km.
The sky-plane scale is 3925.8 km/arcsec.
Diameter estimates:
54.7 km assuming a 5% albedo, aximum of 2.6 sec for a central chord
22.3 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 54.7 km used for deployment plan.
Star training set for 6545_Leitus, (2025/06/22 02:35UT) Object RA Dec mag sep mel Regulus 10:09:43.6 +11:50:30 1.3 19.41 105 PPM 193861 10:52:23.1 -03:13:42 5.8 1.74 121 40 Sex 10:50:34.8 -04:09:32 7.0 0.71 120 PPM 193804 10:49:56.1 -04:49:31 9.5 0.06 121 6545_Leitus 10:49:42.2 -04:50:04 16.0 121 Positions are for equinox of date
Star training set for 6545_Leitus, (2025/06/22 02:35UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 19.41 105 PPM 193861 10:51:05.3 -03:05:34 5.8 1.74 121 40 Sex 10:49:17.2 -04:01:25 7.0 0.71 120 PPM 193804 10:48:38.6 -04:41:25 9.5 0.06 121 6545_Leitus 10:48:24.7 -04:41:57 16.0 120 Positions are for J2000