Occultation event with (17492) Hippasos, event index number 4165
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/09/03 07:30:11 UTC
J2000 position of star is 06:53:26.6 +25:03:31
Equinox of date position of star is 06:55:04.8 +25:01:26
Star is 45 degrees from the moon. Moon is 62% illuminated.
Stellar brightness G=14.7, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
SNR of 8.5 per integration for unocculted signal
Expected flux drop is 77% with SNR of 6.6 for the occulted depth (per occulted point)
Apparent velocity is 26.7 km/sec on the sky relative to the star, or, 22.2 arcsec/hr.
Position angle of asteroid motion is 80.3 degrees
The recommended exposure time corresponds to 13.3 km per image.
The 1-sigma error in the time of the event is 0.7 seconds.
The 1-sigma cross-track error in the shadow position is 27.3 km.
The sky-plane scale is 4319.1 km/arcsec.
Diameter estimates:
59.2 km assuming a 5% albedo, maximum of 2.2 sec for a central chord
24.1 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 54.0 km used for deployment plan.
Star training set for 17492_Hippasos, (2026/09/03 07:30UT) Object RA Dec mag sep mel Pollux 07:46:56.7 +27:57:34 1.1 11.96 55 Alhena 06:39:15.1 +16:22:27 1.9 9.41 43 37 Gem 06:56:57.0 +25:20:24 6.3 0.53 45 PPM 096677 06:54:44.6 +25:16:35 7.7 0.26 44 PPM 096669 06:54:23.2 +24:56:01 9.7 0.18 44 17492_Hippasos 06:55:04.8 +25:01:26 16.0 45 Positions are for equinox of date
Star training set for 17492_Hippasos, (2026/09/03 07:30UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 11.96 55 Alhena 06:37:42.8 +16:23:56 1.9 9.41 43 37 Gem 06:55:18.5 +25:22:33 6.3 0.53 45 PPM 096677 06:53:06.2 +25:18:40 7.7 0.26 44 PPM 096669 06:52:45.1 +24:58:05 9.7 0.18 44 17492_Hippasos 06:53:26.6 +25:03:31 16.0 45 Positions are for J2000