Occultation event with (17492) Hippasos, event index number 5074
Regions able to see the event: Europe
Geocentric closest approach at 2026/12/06 18:39:11 UTC
J2000 position of star is 07:05:51.4 +29:25:54
Equinox of date position of star is 07:07:33.7 +29:23:19
Star is 126 degrees from the moon. Moon is 5% illuminated.
Stellar brightness G=14.6, apparent brightess of occulting body is G=15.3
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 9.7 per integration for unocculted signal
Expected flux drop is 67% with SNR of 6.5 for the occulted depth (per occulted point)
Apparent velocity is 17.2 km/sec on the sky relative to the star, or, 18.4 arcsec/hr.
Position angle of asteroid motion is 122.4 degrees
The recommended exposure time corresponds to 9.5 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 32.1 km.
The sky-plane scale is 3373.8 km/arcsec.
Diameter estimates:
59.2 km assuming a 5% albedo, maximum of 3.4 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, (2026/12/06 18:39UT) Object RA Dec mag sep mel Pollux 07:46:57.7 +27:57:32 1.1 8.76 117 PPM 097053 07:09:06.0 +28:07:57 6.2 1.30 125 PPM 097011 07:07:15.3 +29:28:24 8.4 0.11 126 17492_Hippasos 07:07:33.7 +29:23:19 15.3 125 Positions are for equinox of date
Star training set for 17492_Hippasos, (2026/12/06 18:39UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 8.76 117 PPM 097053 07:07:24.8 +28:10:36 6.2 1.30 125 PPM 097011 07:05:33.0 +29:30:58 8.4 0.11 126 17492_Hippasos 07:05:51.4 +29:25:54 15.3 125 Positions are for J2000