Occultation event with (17492) Hippasos, event index number 3105
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/01/04 00:40:31 UTC
J2000 position of star is 04:44:14.2 +14:30:16
Equinox of date position of star is 04:45:42.7 +14:33:03
Star is 42 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=14.0, apparent brightess of occulting body is G=15.3
Use an exposure time of 0.25 seconds with the standard RECON-QHY system.
SNR of 8.9 per integration for unocculted signal
Expected flux drop is 76% with SNR of 6.8 for the occulted depth (per occulted point)
Apparent velocity is 16.7 km/sec on the sky relative to the star, or, 18.2 arcsec/hr.
Position angle of asteroid motion is 111.2 degrees
The recommended exposure time corresponds to 4.2 km per image.
The 1-sigma error in the time of the event is 0.5 seconds.
The 1-sigma cross-track error in the shadow position is 30.1 km.
The sky-plane scale is 3298.6 km/arcsec.
Diameter estimates:
59.2 km assuming a 5% albedo, maximum of 3.6 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, (2026/01/04 00:41UT) Object RA Dec mag sep mel Aldebaran 04:37:25.0 +16:33:34 0.8 2.83 43 Bellatrix 05:26:31.6 +06:22:16 1.6 12.94 37 91Sig1Tau 04:40:38.5 +15:50:56 5.3 1.78 43 PPM 120199 04:46:13.4 +14:40:22 8.2 0.17 42 PPM 120189 04:45:32.1 +14:36:00 10.1 0.07 42 17492_Hippasos 04:45:42.7 +14:33:03 15.3 42 Positions are for equinox of date
Star training set for 17492_Hippasos, (2026/01/04 00:41UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 2.83 43 Bellatrix 05:25:07.8 +06:20:58 1.6 12.94 37 91Sig1Tau 04:39:09.2 +15:47:58 5.3 1.78 43 PPM 120199 04:44:44.8 +14:37:36 8.2 0.17 42 PPM 120189 04:44:03.5 +14:33:12 10.1 0.07 42 17492_Hippasos 04:44:14.2 +14:30:16 15.3 42 Positions are for J2000