Occultation event with (7119) Hiera, event index number 1030
Regions able to see the event: Senegal
Geocentric closest approach at 2025/06/04 21:27:31 UTC
J2000 position of star is 08:59:30.0 +04:34:31
Equinox of date position of star is 09:00:50.1 +04:28:31
Star is 49 degrees from the moon. Moon is 67% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=15.5
Use an exposure time of 1.05 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 29% with SNR of 0.9 for the occulted depth (per occulted point)
Apparent velocity is 26.2 km/sec on the sky relative to the star, or, 23.5 arcsec/hr.
Position angle of asteroid motion is 350.0 degrees
The recommended exposure time corresponds to 27.5 km per image.
The 1-sigma error in the time of the event is 1.4 seconds.
The 1-sigma cross-track error in the shadow position is 24.8 km.
The sky-plane scale is 4016.2 km/arcsec.
Diameter estimates:
66.1 km assuming a 5% albedo, aximum of 2.5 sec for a central chord
27.0 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 66.1 km used for deployment plan.
Star training set for 7119_Hiera, (2025/06/04 21:28UT) Object RA Dec mag sep mel Regulus 10:09:43.4 +11:50:31 1.3 18.56 34 Alphard 09:28:50.2 -08:46:12 2.0 14.97 42 18Ome Hya 09:07:18.6 +04:59:21 5.0 1.69 47 PPM 155325 09:02:55.9 +04:53:08 7.7 0.66 48 PPM 155289 09:01:14.7 +04:54:26 9.6 0.44 49 PPM 155297 09:01:33.4 +04:18:24 11.0 0.25 49 7119_Hiera 09:00:50.1 +04:28:31 15.5 48 Positions are for equinox of date
Star training set for 7119_Hiera, (2025/06/04 21:28UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 18.56 34 Alphard 09:27:35.2 -08:39:30 2.0 14.97 42 18Ome Hya 09:05:58.3 +05:05:32 5.0 1.69 47 PPM 155325 09:01:35.7 +04:59:12 7.7 0.66 48 PPM 155289 08:59:54.4 +05:00:27 9.6 0.44 49 PPM 155297 09:00:13.4 +04:24:26 11.0 0.25 49 7119_Hiera 08:59:30.0 +04:34:31 15.5 49 Positions are for J2000