Occultation event with (17492) Hippasos, event index number 3163
Regions able to see the event: Europe,Australia,UAE
Geocentric closest approach at 2026/01/21 16:21:48 UTC
J2000 position of star is 04:37:41.8 +15:20:45
Equinox of date position of star is 04:39:10.9 +15:23:47
Star is 95 degrees from the moon. Moon is 8% illuminated.
Stellar brightness G=8.4, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 89.0 per integration for unocculted signal
Expected flux drop is 100% with SNR of 88.9 for the occulted depth (per occulted point)
Apparent velocity is 11.7 km/sec on the sky relative to the star, or, 12.3 arcsec/hr.
Position angle of asteroid motion is 128.9 degrees
The recommended exposure time corresponds to 1.4 km per image.
The 1-sigma error in the time of the event is 0.1 seconds.
The 1-sigma cross-track error in the shadow position is 30.8 km.
The sky-plane scale is 3439.8 km/arcsec.
Diameter estimates:
59.2 km assuming a 5% albedo, maximum of 5.1 sec for a central chord
24.1 km assuming a 30% albedo, maximum of 2.1 sec for a central chord
Cross-track diameter of 54.0 km used for deployment plan.
Star training set for 17492_Hippasos, (2026/01/21 16:22UT) Object RA Dec mag sep mel Aldebaran 04:37:25.1 +16:33:34 0.8 1.24 95 Bellatrix 05:26:31.8 +06:22:16 1.6 14.71 105 91Sig1Tau 04:40:38.6 +15:50:57 5.3 0.57 95 PPM 120087 04:39:01.1 +15:11:48 8.0 0.20 95 PPM 120088 04:39:10.9 +15:23:47 9.8 0.00 95 17492_Hippasos 04:39:10.9 +15:23:47 15.5 95 Positions are for equinox of date
Star training set for 17492_Hippasos, (2026/01/21 16:22UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 1.24 95 Bellatrix 05:25:07.8 +06:20:58 1.6 14.71 105 91Sig1Tau 04:39:09.2 +15:47:58 5.3 0.57 95 PPM 120087 04:37:32.1 +15:08:46 8.0 0.20 95 PPM 120088 04:37:41.8 +15:20:45 9.8 0.00 95 17492_Hippasos 04:37:41.8 +15:20:45 15.5 95 Positions are for J2000