Occultation event with (5025) Mecisteus, event index number 4916
Regions able to see the event: Europe
Geocentric closest approach at 2026/11/28 06:08:47 UTC
J2000 position of star is 13:10:24.1 -12:07:42
Equinox of date position of star is 13:11:49.2 -12:16:16
Star is 84 degrees from the moon. Moon is 82% illuminated.
Stellar brightness G=16.0, apparent brightess of occulting body is G=16.3
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 58% with SNR of 1.8 for the occulted depth (per occulted point)
Apparent velocity is 33.5 km/sec on the sky relative to the star, or, 27.4 arcsec/hr.
Position angle of asteroid motion is 118.6 degrees
The recommended exposure time corresponds to 18.4 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 18.7 km.
The sky-plane scale is 4410.3 km/arcsec.
Diameter estimates:
50.1 km assuming a 5% albedo, maximum of 1.5 sec for a central chord
20.5 km assuming a 30% albedo, maximum of 0.6 sec for a central chord
Cross-track diameter of 39.8 km used for deployment plan.
Star training set for 5025_Mecisteus, (2026/11/28 06:09UT) Object RA Dec mag sep mel Spica 13:26:36.9 -11:18:03 1.0 3.75 87 49 Vir 13:09:18.6 -10:53:01 4.9 1.52 83 PPM 226914 13:12:43.7 -12:04:14 8.4 0.30 84 PPM 226888 13:11:43.3 -12:14:28 9.5 0.04 84 5025_Mecisteus 13:11:49.2 -12:16:16 16.3 85 Positions are for equinox of date
Star training set for 5025_Mecisteus, (2026/11/28 06:09UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 3.75 87 49 Vir 13:07:53.8 -10:44:26 4.9 1.52 83 PPM 226914 13:11:18.6 -11:55:41 8.4 0.30 84 PPM 226888 13:10:18.2 -12:05:55 9.5 0.04 84 5025_Mecisteus 13:10:24.1 -12:07:42 16.3 84 Positions are for J2000