Occultation event with (5027) Androgeos, event index number 1653
Regions able to see the event: Europe
Geocentric closest approach at 2025/12/08 02:41:15 UTC
J2000 position of star is 12:15:06.9 +32:45:05
Equinox of date position of star is 12:16:25.1 +32:36:27
Star is 54 degrees from the moon. Moon is 86% illuminated.
Stellar brightness G=14.6, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 9.8 per integration for unocculted signal
Expected flux drop is 68% with SNR of 6.7 for the occulted depth (per occulted point)
Apparent velocity is 20.9 km/sec on the sky relative to the star, or, 19.8 arcsec/hr.
Position angle of asteroid motion is 69.4 degrees
The recommended exposure time corresponds to 12.5 km per image.
The 1-sigma error in the time of the event is 0.2 seconds.
The 1-sigma cross-track error in the shadow position is 35.8 km.
The sky-plane scale is 3805.6 km/arcsec.
Diameter estimates:
67.0 km assuming a 5% albedo, aximum of 3.2 sec for a central chord
27.4 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 59.8 km used for deployment plan.
Star training set for 5027_Androgeos, (2025/12/08 02:41UT) Object RA Dec mag sep mel Arcturus 14:16:50.8 +19:02:55 0.0 30.15 83 68Del Leo 11:15:29.0 +20:22:52 2.6 18.27 42 PPM 076381 12:17:48.1 +32:55:00 6.1 0.42 54 PPM 076367 12:16:27.7 +32:41:50 8.6 0.09 54 5027_Androgeos 12:16:25.1 +32:36:27 15.5 54 Positions are for equinox of date
Star training set for 5027_Androgeos, (2025/12/08 02:41UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 30.15 83 68Del Leo 11:14:06.7 +20:31:22 2.6 18.27 42 PPM 076381 12:16:30.0 +33:03:39 6.1 0.42 54 PPM 076367 12:15:09.4 +32:50:29 8.6 0.09 54 5027_Androgeos 12:15:06.9 +32:45:05 15.5 54 Positions are for J2000