Occultation event with (5027) Androgeos, event index number 3770
Regions able to see the event: Europe
Geocentric closest approach at 2026/05/30 00:49:51 UTC
J2000 position of star is 11:43:28.5 +37:14:26
Equinox of date position of star is 11:44:51.5 +37:05:38
Star is 80 degrees from the moon. Moon is 98% illuminated.
Stellar brightness G=7.9, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 96.2 per integration for unocculted signal
Expected flux drop is 100% with SNR of 96.1 for the occulted depth (per occulted point)
Apparent velocity is 18.7 km/sec on the sky relative to the star, or, 17.6 arcsec/hr.
Position angle of asteroid motion is 169.6 degrees
The recommended exposure time corresponds to 2.2 km per image.
The 1-sigma error in the time of the event is 1.9 seconds.
The 1-sigma cross-track error in the shadow position is 8.0 km.
The sky-plane scale is 3814.4 km/arcsec.
Diameter estimates:
67.0 km assuming a 5% albedo, maximum of 3.6 sec for a central chord
27.4 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 59.8 km used for deployment plan.
Star training set for 5027_Androgeos, (2026/05/30 00:50UT) Object RA Dec mag sep mel Regulus 10:09:46.6 +11:50:14 1.3 33.05 84 Phad 11:55:12.5 +53:32:52 2.4 16.55 89 PPM 076134 11:54:29.3 +37:31:50 6.4 1.96 78 PPM 076052 11:46:13.5 +37:46:34 9.7 0.73 80 PPM 076022 11:43:23.8 +37:12:14 10.6 0.31 80 5027_Androgeos 11:44:51.5 +37:05:38 15.5 79 Positions are for equinox of date
Star training set for 5027_Androgeos, (2026/05/30 00:50UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 33.05 84 Phad 11:53:50.1 +53:41:41 2.4 16.55 89 PPM 076134 11:53:07.4 +37:40:39 6.4 1.96 78 PPM 076052 11:44:50.5 +37:55:22 9.7 0.73 80 PPM 076022 11:42:00.5 +37:21:02 10.6 0.31 80 5027_Androgeos 11:43:28.5 +37:14:26 15.5 80 Positions are for J2000