Occultation event with (15535) 00AT177, event index number 1513
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/11/14 10:02:55 UTC
J2000 position of star is 12:45:22.8 +01:01:04
Equinox of date position of star is 12:46:42.3 +00:52:36
Star is 23 degrees from the moon. Moon is 28% illuminated.
Stellar brightness G=12.8, apparent brightess of occulting body is G=16.4
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 13.1 per integration for unocculted signal
Expected flux drop is 97% with SNR of 12.6 for the occulted depth (per occulted point)
Apparent velocity is 35.2 km/sec on the sky relative to the star, or, 30.1 arcsec/hr.
Position angle of asteroid motion is 105.8 degrees
The recommended exposure time corresponds to 4.2 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 33.3 km.
The sky-plane scale is 4209.1 km/arcsec.
Diameter estimates:
44.7 km assuming a 5% albedo, aximum of 1.3 sec for a central chord
18.2 km assuming a 30% albedo, maximum of 0.5 sec for a central chord
Cross-track diameter of 39.8 km used for deployment plan.
Star training set for 15535_00AT177, (2025/11/14 10:03UT) Object RA Dec mag sep mel Spica 13:26:33.6 -11:17:44 1.0 15.69 36 Vindemiatrix 13:03:27.9 +10:49:14 2.8 10.78 27 35 Vir 12:49:10.5 +03:25:55 6.4 2.63 23 PPM 159098 12:43:48.7 +01:11:14 8.3 0.79 22 PPM 159137 12:46:38.7 +00:54:51 9.7 0.04 23 15535_00AT177 12:46:42.3 +00:52:36 16.4 23 Positions are for equinox of date
Star training set for 15535_00AT177, (2025/11/14 10:03UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 15.69 36 Vindemiatrix 13:02:10.1 +10:57:33 2.8 10.78 27 35 Vir 12:47:51.4 +03:34:22 6.4 2.63 23 PPM 159098 12:42:29.2 +01:19:43 8.3 0.79 22 PPM 159137 12:45:19.3 +01:03:19 9.7 0.04 23 15535_00AT177 12:45:22.8 +01:01:04 16.4 23 Positions are for J2000