Occultation event with (5027) Androgeos, event index number 3702
Regions able to see the event: Europe
Geocentric closest approach at 2026/04/30 21:13:58 UTC
J2000 position of star is 11:46:05.5 +40:04:55
Equinox of date position of star is 11:47:28.2 +39:56:08
Star is 63 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=11.3, apparent brightess of occulting body is G=15.3
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 31.8 per integration for unocculted signal
Expected flux drop is 98% with SNR of 31.0 for the occulted depth (per occulted point)
Apparent velocity is 13.7 km/sec on the sky relative to the star, or, 13.9 arcsec/hr.
Position angle of asteroid motion is 36.6 degrees
The recommended exposure time corresponds to 1.6 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 31.5 km.
The sky-plane scale is 3545.9 km/arcsec.
Diameter estimates:
67.0 km assuming a 5% albedo, maximum of 4.9 sec for a central chord
27.4 km assuming a 30% albedo, maximum of 2.0 sec for a central chord
Cross-track diameter of 59.8 km used for deployment plan.
Star training set for 5027_Androgeos, (2026/04/30 21:14UT) Object RA Dec mag sep mel Regulus 10:09:46.3 +11:50:15 1.3 35.41 61 Phad 11:55:12.2 +53:32:54 2.4 13.68 74 PPM 076134 11:54:29.1 +37:31:52 6.4 2.77 60 PPM 052556 11:40:20.0 +40:06:21 7.9 1.38 64 PPM 076076 11:48:53.1 +39:46:54 9.2 0.31 62 PPM 052619 11:47:22.8 +39:54:48 10.1 0.03 63 5027_Androgeos 11:47:28.2 +39:56:08 15.3 63 Positions are for equinox of date
Star training set for 5027_Androgeos, (2026/04/30 21:14UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 35.41 61 Phad 11:53:50.1 +53:41:41 2.4 13.68 74 PPM 076134 11:53:07.4 +37:40:39 6.4 2.77 60 PPM 052556 11:38:56.4 +40:15:07 7.9 1.38 64 PPM 076076 11:47:30.6 +39:55:40 9.2 0.31 62 PPM 052619 11:46:00.2 +40:03:35 10.1 0.03 63 5027_Androgeos 11:46:05.5 +40:04:55 15.3 63 Positions are for J2000