Occultation event with (7119) Hiera, event index number 1010
Regions able to see the event: US
Geocentric closest approach at 2025/05/29 01:31:32 UTC
J2000 position of star is 08:55:28.5 +04:47:50
Equinox of date position of star is 08:56:48.6 +04:41:56
Star is 43 degrees from the moon. Moon is 6% illuminated.
Stellar brightness G=14.1, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.30 seconds with the standard RECON-QHY system.
SNR of 9.5 per integration for unocculted signal
Expected flux drop is 79% with SNR of 7.5 for the occulted depth (per occulted point)
Apparent velocity is 23.7 km/sec on the sky relative to the star, or, 21.6 arcsec/hr.
The recommended exposure time corresponds to 7.1 km per image.
The 1-sigma error in the time of the event is 1.7 seconds.
The 1-sigma cross-track error in the shadow position is 27.2 km.
The sky-plane scale is 3944.4 km/arcsec.
Diameter estimates:
66.1 km assuming a 5% albedo, aximum of 2.8 sec for a central chord
27.0 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 66.1 km used for deployment plan.
Star training set for 7119_Hiera, (2025/05/29 01:32UT) Object RA Dec mag sep mel Regulus 10:09:43.3 +11:50:31 1.3 19.39 55 Alphard 09:28:50.2 -08:46:12 2.0 15.66 58 PPM 155117 08:53:44.6 +05:14:36 6.5 0.94 42 PPM 155224 08:57:56.9 +04:08:16 7.6 0.63 44 PPM 155198 08:56:47.6 +04:44:10 9.2 0.04 43 7119_Hiera 08:56:48.6 +04:41:56 15.5 44 Positions are for equinox of date
Star training set for 7119_Hiera, (2025/05/29 01:32UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 19.39 55 Alphard 09:27:35.2 -08:39:30 2.0 15.66 58 PPM 155117 08:52:24.2 +05:20:25 6.5 0.94 42 PPM 155224 08:56:37.0 +04:14:12 7.6 0.63 44 PPM 155198 08:55:27.5 +04:50:03 9.2 0.04 43 7119_Hiera 08:55:28.5 +04:47:50 15.5 43 Positions are for J2000