Occultation event with (15535) 00AT177, event index number 3621
Regions able to see the event: Europe
Geocentric closest approach at 2026/04/13 00:53:19 UTC
J2000 position of star is 13:04:42.8 +04:30:51
Equinox of date position of star is 13:06:02.8 +04:22:26
Star is 132 degrees from the moon. Moon is 23% illuminated.
Stellar brightness G=14.9, apparent brightess of occulting body is G=15.4
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 7.6 per integration for unocculted signal
Expected flux drop is 62% with SNR of 4.7 for the occulted depth (per occulted point)
Apparent velocity is 16.6 km/sec on the sky relative to the star, or, 19.5 arcsec/hr.
Position angle of asteroid motion is 118.0 degrees
The recommended exposure time corresponds to 9.2 km per image.
The 1-sigma error in the time of the event is 1.5 seconds.
The 1-sigma cross-track error in the shadow position is 29.6 km.
The sky-plane scale is 3070.2 km/arcsec.
Diameter estimates:
44.7 km assuming a 5% albedo, maximum of 2.7 sec for a central chord
18.2 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 39.8 km used for deployment plan.
Star training set for 15535_00AT177, (2026/04/13 00:53UT) Object RA Dec mag sep mel Spica 13:26:34.9 -11:17:52 1.0 16.48 122 Vindemiatrix 13:03:29.1 +10:49:06 2.8 6.48 134 43Del Vir 12:56:55.7 +03:15:18 3.4 2.53 134 PPM 159469 13:07:05.3 +03:56:59 8.5 0.50 132 PPM 159470 13:07:09.2 +04:15:32 11.0 0.30 132 15535_00AT177 13:06:02.8 +04:22:26 15.4 132 Positions are for equinox of date
Star training set for 15535_00AT177, (2026/04/13 00:53UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 16.48 122 Vindemiatrix 13:02:10.1 +10:57:33 2.8 6.48 134 43Del Vir 12:55:35.4 +03:23:49 3.4 2.53 134 PPM 159469 13:05:45.2 +04:05:24 8.5 0.50 132 PPM 159470 13:05:49.2 +04:23:57 11.0 0.30 132 15535_00AT177 13:04:42.8 +04:30:51 15.4 132 Positions are for J2000