Occultation event with (17492) Hippasos, event index number 4886
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/11/26 02:28:17 UTC
J2000 position of star is 07:10:15.5 +28:43:57
Equinox of date position of star is 07:11:57.0 +28:41:13
Star is 21 degrees from the moon. Moon is 97% illuminated.
Stellar brightness G=12.1, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 19.6 per integration for unocculted signal
Expected flux drop is 96% with SNR of 18.7 for the occulted depth (per occulted point)
Apparent velocity is 14.3 km/sec on the sky relative to the star, or, 14.9 arcsec/hr.
Position angle of asteroid motion is 130.5 degrees
The recommended exposure time corresponds to 1.7 km per image.
The 1-sigma error in the time of the event is 0.8 seconds.
The 1-sigma cross-track error in the shadow position is 31.9 km.
The sky-plane scale is 3444.1 km/arcsec.
Diameter estimates:
59.2 km assuming a 5% albedo, maximum of 4.1 sec for a central chord
24.1 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 54.0 km used for deployment plan.
Star training set for 17492_Hippasos, (2026/11/26 02:28UT) Object RA Dec mag sep mel Pollux 07:46:57.6 +27:57:32 1.1 7.74 28 PPM 097053 07:09:05.9 +28:07:57 6.2 0.84 20 PPM 097109 07:10:57.2 +28:00:27 8.3 0.71 21 PPM 097123 07:11:26.5 +28:40:05 9.5 0.11 21 17492_Hippasos 07:11:57.0 +28:41:13 15.5 21 Positions are for equinox of date
Star training set for 17492_Hippasos, (2026/11/26 02:28UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 7.74 28 PPM 097053 07:07:24.8 +28:10:36 6.2 0.84 20 PPM 097109 07:09:16.3 +28:03:10 8.3 0.71 21 PPM 097123 07:09:45.1 +28:42:48 9.5 0.11 21 17492_Hippasos 07:10:15.5 +28:43:57 15.5 21 Positions are for J2000