Occultation event with (5025) Mecisteus, event index number 862
Regions able to see the event: Europe
Geocentric closest approach at 2025/03/28 22:29:40 UTC
J2000 position of star is 09:21:20.6 +20:39:15
Equinox of date position of star is 09:22:46.2 +20:32:44
Star is 135 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=14.2, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.35 seconds with the standard RECON-QHY system.
Expected flux drop is 22% with SNR of 9.5 per integration
Apparent velocity is 7.1 km/sec on the sky relative to the star, or, 8.0 arcsec/hr.
The recommended exposure time corresponds to 2.5 km per image.
The 1-sigma error in the time of the event is 6.3 seconds.
The 1-sigma cross-track error in the shadow position is 23.9 km.
The sky-plane scale is 3213.8 km/arcsec.
Diameter estimates:
49.7 km assuming a 5% albedo, aximum of 7.0 sec for a central chord
20.3 km assuming a 30% albedo, maximum of 2.8 sec for a central chord
Cross-track diameter of 49.7 km used for deployment plan.
Star training set for 5025_Mecisteus, (2025/03/28 22:30UT) Object RA Dec mag sep mel Regulus 10:09:42.8 +11:50:34 1.3 14.23 149 PPM 099404 09:15:03.5 +21:10:40 6.1 1.91 133 PPM 099541 09:25:12.3 +20:15:19 8.1 0.64 136 PPM 099502 09:21:55.9 +20:19:02 9.9 0.30 135 5025_Mecisteus 09:22:46.2 +20:32:44 15.6 135 Positions are for equinox of date
Star training set for 5025_Mecisteus, (2025/03/28 22:30UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 14.23 149 PPM 099404 09:13:37.2 +21:16:59 6.1 1.91 133 PPM 099541 09:23:46.8 +20:21:53 8.1 0.64 136 PPM 099502 09:20:30.3 +20:25:31 9.9 0.30 135 5025_Mecisteus 09:21:20.6 +20:39:15 15.6 135 Positions are for J2000