Occultation event with (5027) Androgeos, event index number 3261
Regions able to see the event: Europe
Geocentric closest approach at 2026/02/18 01:27:44 UTC
J2000 position of star is 12:23:19.3 +39:06:48
Equinox of date position of star is 12:24:36.7 +38:58:07
Star is 141 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=13.3, apparent brightess of occulting body is G=15.0
Use an exposure time of 0.15 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 83% with SNR of 8.2 for the occulted depth (per occulted point)
Apparent velocity is 16.9 km/sec on the sky relative to the star, or, 18.4 arcsec/hr.
Position angle of asteroid motion is 140.3 degrees
The recommended exposure time corresponds to 2.5 km per image.
The 1-sigma error in the time of the event is 2.2 seconds.
The 1-sigma cross-track error in the shadow position is 7.0 km.
The sky-plane scale is 3296.3 km/arcsec.
Diameter estimates:
67.0 km assuming a 5% albedo, maximum of 4.0 sec for a central chord
27.4 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 59.8 km used for deployment plan.
Star training set for 5027_Androgeos, (2026/02/18 01:28UT) Object RA Dec mag sep mel Arcturus 14:16:51.3 +19:02:52 0.0 31.38 125 Phad 11:55:11.6 +53:32:58 2.4 15.42 133 6 CVn 12:27:07.9 +38:52:26 5.0 0.50 141 PPM 076464 12:26:01.9 +38:10:28 8.5 0.84 142 PPM 076445 12:24:07.8 +39:07:51 9.2 0.19 141 5027_Androgeos 12:24:36.7 +38:58:07 15.0 141 Positions are for equinox of date
Star training set for 5027_Androgeos, (2026/02/18 01:28UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 31.38 125 Phad 11:53:50.1 +53:41:41 2.4 15.42 133 6 CVn 12:25:50.8 +39:01:06 5.0 0.50 141 PPM 076464 12:24:44.6 +38:19:09 8.5 0.84 142 PPM 076445 12:22:50.3 +39:16:32 9.2 0.19 141 5027_Androgeos 12:23:19.3 +39:06:48 15.0 141 Positions are for J2000