Occultation event with (7119) Hiera, event index number 3760
Regions able to see the event: Australia
Geocentric closest approach at 2026/05/23 11:54:44 UTC
J2000 position of star is 10:30:31.0 -11:24:37
Equinox of date position of star is 10:31:49.5 -11:32:46
Star is 22 degrees from the moon. Moon is 50% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=15.5
Use an exposure time of 1.55 seconds with the standard RECON-QHY system.
SNR of 4.2 per integration for unocculted signal
Expected flux drop is 30% with SNR of 1.3 for the occulted depth (per occulted point)
Apparent velocity is 9.4 km/sec on the sky relative to the star, or, 9.1 arcsec/hr.
Position angle of asteroid motion is 62.0 degrees
The recommended exposure time corresponds to 14.5 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 36.8 km.
The sky-plane scale is 3707.2 km/arcsec.
Diameter estimates:
66.4 km assuming a 5% albedo, maximum of 7.1 sec for a central chord
27.1 km assuming a 30% albedo, maximum of 2.9 sec for a central chord
Cross-track diameter of 59.2 km used for deployment plan.
Star training set for 7119_Hiera, (2026/05/23 11:55UT) Object RA Dec mag sep mel Regulus 10:09:46.5 +11:50:14 1.3 24.02 3 Alphard 09:28:53.1 -08:46:27 2.0 15.73 23 PPM 223198 10:37:51.3 -12:22:20 5.7 1.69 23 PPM 223086 10:33:20.0 -11:33:41 7.9 0.37 22 PPM 223047 10:31:38.4 -11:42:13 9.2 0.16 22 7119_Hiera 10:31:49.5 -11:32:46 15.5 22 Positions are for equinox of date
Star training set for 7119_Hiera, (2026/05/23 11:55UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 24.02 3 Alphard 09:27:35.2 -08:39:30 2.0 15.73 23 PPM 223198 10:36:32.9 -12:14:06 5.7 1.69 23 PPM 223086 10:32:01.5 -11:25:30 7.9 0.37 22 PPM 223047 10:30:20.0 -11:34:04 9.2 0.16 22 7119_Hiera 10:30:31.0 -11:24:37 15.5 22 Positions are for J2000