Occultation event with (15535) 00AT177, event index number 957
Regions able to see the event: UAE
Geocentric closest approach at 2025/05/08 17:55:23 UTC
J2000 position of star is 10:32:02.6 +12:15:00
Equinox of date position of star is 10:33:23.2 +12:07:08
Star is 30 degrees from the moon. Moon is 87% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=16.0
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 8.7 per integration for unocculted signal
Expected flux drop is 55% with SNR of 4.8 for the occulted depth (per occulted point)
Apparent velocity is 4.4 km/sec on the sky relative to the star, or, 4.8 arcsec/hr.
Position angle of asteroid motion is 13.5 degrees
The recommended exposure time corresponds to 8.9 km per image.
The 1-sigma error in the time of the event is 10.1 seconds.
The 1-sigma cross-track error in the shadow position is 12.5 km.
The sky-plane scale is 3338.7 km/arcsec.
Diameter estimates:
44.3 km assuming a 5% albedo, aximum of 10.0 sec for a central chord
18.1 km assuming a 30% albedo, maximum of 4.1 sec for a central chord
Cross-track diameter of 44.3 km used for deployment plan.
Star training set for 15535_00AT177, (2025/05/08 17:55UT) Object RA Dec mag sep mel Regulus 10:09:43.2 +11:50:32 1.3 5.79 36 46 Leo 10:33:32.8 +14:00:23 5.5 1.89 31 PPM 127517 10:35:27.9 +12:14:35 8.0 0.52 30 PPM 127492 10:33:54.4 +12:35:57 8.7 0.50 31 PPM 127498 10:34:25.9 +11:52:28 10.4 0.35 30 15535_00AT177 10:33:23.2 +12:07:08 16.0 30 Positions are for equinox of date
Star training set for 15535_00AT177, (2025/05/08 17:55UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 5.79 36 46 Leo 10:32:11.7 +14:08:15 5.5 1.89 31 PPM 127517 10:34:07.2 +12:22:28 8.0 0.52 30 PPM 127492 10:32:33.6 +12:43:49 8.7 0.50 31 PPM 127498 10:33:05.3 +12:00:21 10.4 0.35 30 15535_00AT177 10:32:02.6 +12:15:00 16.0 30 Positions are for J2000