Occultation event with (17492) Hippasos, event index number 3210
Regions able to see the event: Australia
Geocentric closest approach at 2026/02/04 11:18:09 UTC
J2000 position of star is 04:35:19.3 +16:05:05
Equinox of date position of star is 04:36:49.0 +16:08:12
Star is 98 degrees from the moon. Moon is 92% illuminated.
Stellar brightness G=16.8, apparent brightess of occulting body is G=15.6
Use an exposure time of 1.65 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 25% with SNR of 0.7 for the occulted depth (per occulted point)
Apparent velocity is 8.8 km/sec on the sky relative to the star, or, 8.8 arcsec/hr.
Position angle of asteroid motion is 161.0 degrees
The recommended exposure time corresponds to 14.5 km per image.
The 1-sigma error in the time of the event is 2.0 seconds.
The 1-sigma cross-track error in the shadow position is 25.5 km.
The sky-plane scale is 3580.8 km/arcsec.
Diameter estimates:
59.2 km assuming a 5% albedo, maximum of 6.7 sec for a central chord
24.1 km assuming a 30% albedo, maximum of 2.8 sec for a central chord
Cross-track diameter of 54.0 km used for deployment plan.
Star training set for 17492_Hippasos, (2026/02/04 11:18UT) Object RA Dec mag sep mel Aldebaran 04:37:25.3 +16:33:35 0.8 0.45 98 Bellatrix 05:26:31.9 +06:22:16 1.6 15.61 87 89 Tau 04:39:39.2 +16:05:00 6.1 0.68 98 PPM 120049 04:37:03.5 +16:11:46 8.4 0.08 98 17492_Hippasos 04:36:49.0 +16:08:12 15.6 98 Positions are for equinox of date
Star training set for 17492_Hippasos, (2026/02/04 11:18UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 0.45 98 Bellatrix 05:25:07.8 +06:20:58 1.6 15.61 87 89 Tau 04:38:09.6 +16:01:59 6.1 0.68 98 PPM 120049 04:35:33.8 +16:08:39 8.4 0.08 98 17492_Hippasos 04:35:19.3 +16:05:05 15.6 98 Positions are for J2000