Occultation event with (7119) Hiera, event index number 1656
Regions able to see the event: SAmericaS
Geocentric closest approach at 2025/12/08 08:17:54 UTC
J2000 position of star is 11:07:14.8 -11:57:34
Equinox of date position of star is 11:08:32.9 -12:06:01
Star is 53 degrees from the moon. Moon is 84% illuminated.
Stellar brightness G=13.6, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.18 seconds with the standard RECON-QHY system.
SNR of 9.6 per integration for unocculted signal
Expected flux drop is 86% with SNR of 8.2 for the occulted depth (per occulted point)
Apparent velocity is 18.4 km/sec on the sky relative to the star, or, 17.2 arcsec/hr.
Position angle of asteroid motion is 147.0 degrees
The recommended exposure time corresponds to 3.3 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 1.2 km.
The sky-plane scale is 3846.6 km/arcsec.
Diameter estimates:
66.4 km assuming a 5% albedo, aximum of 3.6 sec for a central chord
27.1 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 59.2 km used for deployment plan.
Star training set for 7119_Hiera, (2025/12/08 08:18UT) Object RA Dec mag sep mel Regulus 10:09:45.0 +11:50:22 1.3 28.04 27 4Gam Crv 12:17:08.6 -17:41:09 2.6 17.48 69 PPM 223913 11:06:52.2 -11:13:48 6.1 0.96 52 PPM 223918 11:07:16.8 -12:18:20 8.2 0.37 52 PPM 223957 11:08:20.8 -12:05:09 8.6 0.05 53 7119_Hiera 11:08:32.9 -12:06:01 15.5 53 Positions are for equinox of date
Star training set for 7119_Hiera, (2025/12/08 08:18UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 28.04 27 4Gam Crv 12:15:48.1 -17:32:30 2.6 17.48 69 PPM 223913 11:05:34.0 -11:05:22 6.1 0.96 52 PPM 223918 11:05:58.8 -12:09:54 8.2 0.37 52 PPM 223957 11:07:02.7 -11:56:42 8.6 0.05 53 7119_Hiera 11:07:14.8 -11:57:34 15.5 53 Positions are for J2000