Occultation event with (17492) Hippasos, event index number 5133
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/12/09 05:31:31 UTC
J2000 position of star is 07:04:39.5 +29:35:35
Equinox of date position of star is 07:06:22.0 +29:33:03
Star is 155 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=15.4, apparent brightess of occulting body is G=15.3
Use an exposure time of 0.75 seconds with the standard RECON-QHY system.
SNR of 6.2 per integration for unocculted signal
Expected flux drop is 48% with SNR of 3.0 for the occulted depth (per occulted point)
Apparent velocity is 17.8 km/sec on the sky relative to the star, or, 19.1 arcsec/hr.
Position angle of asteroid motion is 121.0 degrees
The recommended exposure time corresponds to 13.4 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 31.7 km.
The sky-plane scale is 3360.7 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 1.4 sec for a central chord
Cross-track diameter of 54.0 km used for deployment plan.
Star training set for 17492_Hippasos, (2026/12/09 05:32UT) Object RA Dec mag sep mel Pollux 07:46:57.7 +27:57:32 1.1 9.04 146 PPM 097053 07:09:06.1 +28:07:57 6.2 1.54 154 PPM 097011 07:07:15.4 +29:28:24 8.4 0.21 155 PPM 096992 07:06:27.7 +29:26:48 11.7 0.11 155 17492_Hippasos 07:06:22.0 +29:33:03 15.3 155 Positions are for equinox of date
Star training set for 17492_Hippasos, (2026/12/09 05:32UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 9.04 146 PPM 097053 07:07:24.8 +28:10:36 6.2 1.54 154 PPM 097011 07:05:33.0 +29:30:58 8.4 0.21 155 PPM 096992 07:04:45.3 +29:29:21 11.7 0.11 155 17492_Hippasos 07:04:39.5 +29:35:35 15.3 155 Positions are for J2000