Occultation event with (17492) Hippasos, event index number 859
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/03/27 22:39:30 UTC
J2000 position of star is 03:22:35.6 +03:27:03
Equinox of date position of star is 03:23:54.8 +03:32:23
Star is 63 degrees from the moon. Moon is 3% illuminated.
Stellar brightness G=14.4, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.40 seconds with the standard RECON-QHY system.
Expected flux drop is 21% with SNR of 8.9 per integration
Apparent velocity is 35.2 km/sec on the sky relative to the star, or, 29.5 arcsec/hr.
The recommended exposure time corresponds to 14.1 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 29.9 km.
The sky-plane scale is 4305.7 km/arcsec.
Diameter estimates:
58.6 km assuming a 5% albedo, aximum of 1.7 sec for a central chord
23.9 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 58.6 km used for deployment plan.
Star training set for 17492_Hippasos, (2025/03/27 22:40UT) Object RA Dec mag sep mel Aldebaran 04:37:22.3 +16:33:29 0.8 22.24 83 Menkar 03:03:36.1 +04:11:14 2.5 5.11 59 97Kap2Cet 03:22:26.2 +03:45:54 6.2 0.43 63 PPM 146487 03:22:35.4 +03:32:59 9.2 0.33 63 PPM 146505 03:23:42.5 +03:32:10 10.2 0.05 63 17492_Hippasos 03:23:54.8 +03:32:23 15.9 64 Positions are for equinox of date
Star training set for 17492_Hippasos, (2025/03/27 22:40UT) Object RA Dec mag sep mel Aldebaran 04:35:55.3 +16:30:29 0.8 22.24 83 Menkar 03:02:16.8 +04:05:21 2.5 5.11 59 97Kap2Cet 03:21:06.9 +03:40:31 6.2 0.43 63 PPM 146487 03:21:16.2 +03:27:37 9.2 0.33 63 PPM 146505 03:22:23.3 +03:26:50 10.2 0.05 63 17492_Hippasos 03:22:35.6 +03:27:03 15.9 63 Positions are for J2000