Occultation event with (17492) Hippasos, event index number 5151
Regions able to see the event: Europe
Geocentric closest approach at 2026/12/10 03:10:40 UTC
J2000 position of star is 07:04:12.0 +29:39:06
Equinox of date position of star is 07:05:54.5 +29:36:35
Star is 166 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=16.0, apparent brightess of occulting body is G=15.3
Use an exposure time of 0.70 seconds with the standard RECON-QHY system.
SNR of 3.5 per integration for unocculted signal
Expected flux drop is 34% with SNR of 1.2 for the occulted depth (per occulted point)
Apparent velocity is 18.0 km/sec on the sky relative to the star, or, 19.3 arcsec/hr.
Position angle of asteroid motion is 120.5 degrees
The recommended exposure time corresponds to 12.6 km per image.
The 1-sigma error in the time of the event is 0.3 seconds.
The 1-sigma cross-track error in the shadow position is 32.1 km.
The sky-plane scale is 3356.2 km/arcsec.
Diameter estimates:
59.2 km assuming a 5% albedo, maximum of 3.3 sec for a central chord
24.1 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 54.0 km used for deployment plan.
Star training set for 17492_Hippasos, (2026/12/10 03:11UT) Object RA Dec mag sep mel Pollux 07:46:57.7 +27:57:32 1.1 9.14 157 46Tau Gem 07:12:51.1 +30:11:56 5.5 1.62 164 PPM 097011 07:07:15.4 +29:28:24 8.4 0.32 165 PPM 096965 07:05:25.0 +29:39:00 9.4 0.11 166 17492_Hippasos 07:05:54.5 +29:36:35 15.3 165 Positions are for equinox of date
Star training set for 17492_Hippasos, (2026/12/10 03:11UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 9.14 157 46Tau Gem 07:11:08.3 +30:14:43 5.5 1.62 164 PPM 097011 07:05:33.0 +29:30:58 8.4 0.32 165 PPM 096965 07:03:42.5 +29:41:30 9.4 0.11 166 17492_Hippasos 07:04:12.0 +29:39:06 15.3 166 Positions are for J2000