Occultation event with (5028) Halaesus, event index number 3922
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/08/01 22:53:21 UTC
J2000 position of star is 12:28:14.5 +08:52:24
Equinox of date position of star is 12:29:35.5 +08:43:35
Star is 161 degrees from the moon. Moon is 89% illuminated.
Stellar brightness G=14.3, apparent brightess of occulting body is G=16.4
Use an exposure time of 0.35 seconds with the standard RECON-QHY system.
SNR of 9.3 per integration for unocculted signal
Expected flux drop is 88% with SNR of 8.1 for the occulted depth (per occulted point)
Apparent velocity is 30.1 km/sec on the sky relative to the star, or, 24.1 arcsec/hr.
Position angle of asteroid motion is 128.7 degrees
The recommended exposure time corresponds to 10.5 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 6.3 km.
The sky-plane scale is 4502.1 km/arcsec.
Diameter estimates:
53.0 km assuming a 5% albedo, maximum of 1.8 sec for a central chord
21.6 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 50.8 km used for deployment plan.
Star training set for 5028_Halaesus, (2026/08/01 22:53UT) Object RA Dec mag sep mel Spica 13:26:35.8 -11:17:57 1.0 24.53 144 Vindemiatrix 13:03:30.0 +10:49:01 2.8 8.61 152 PPM 158929 12:32:42.5 +07:27:28 6.0 1.48 160 PPM 158863 12:29:03.2 +08:27:48 7.4 0.29 161 PPM 158866 12:29:14.7 +08:45:07 9.3 0.09 161 5028_Halaesus 12:29:35.5 +08:43:35 16.4 160 Positions are for equinox of date
Star training set for 5028_Halaesus, (2026/08/01 22:53UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 24.53 144 Vindemiatrix 13:02:10.1 +10:57:33 2.8 8.61 152 PPM 158929 12:31:21.4 +07:36:16 6.0 1.48 160 PPM 158863 12:27:42.1 +08:36:37 7.4 0.29 161 PPM 158866 12:27:53.7 +08:53:55 9.3 0.09 161 5028_Halaesus 12:28:14.5 +08:52:24 16.4 161 Positions are for J2000