Occultation event with (5025) Mecisteus, event index number 783
Regions able to see the event: Australia,NZ
Geocentric closest approach at 2025/03/09 11:09:46 UTC
J2000 position of star is 09:27:53.7 +20:46:23
Equinox of date position of star is 09:29:18.9 +20:39:44
Star is 24 degrees from the moon. Moon is 78% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=15.4
Use an exposure time of 1.10 seconds with the standard RECON-QHY system.
Expected flux drop is 74% with SNR of 3.0 per integration
Apparent velocity is 13.3 km/sec on the sky relative to the star, or, 15.6 arcsec/hr.
The recommended exposure time corresponds to 14.6 km per image.
The 1-sigma error in the time of the event is 3.2 seconds.
The 1-sigma cross-track error in the shadow position is 23.4 km.
The sky-plane scale is 3062.6 km/arcsec.
Diameter estimates:
49.7 km assuming a 5% albedo, aximum of 3.7 sec for a central chord
20.3 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 49.7 km used for deployment plan.
Star training set for 5025_Mecisteus, (2025/03/09 11:10UT) Object RA Dec mag sep mel Regulus 10:09:42.6 +11:50:35 1.3 13.10 36 4Lam Leo 09:33:09.2 +22:51:20 4.3 2.37 24 PPM 099647 09:32:59.7 +20:09:30 8.1 1.00 25 PPM 099605 09:30:09.3 +20:35:45 10.0 0.21 24 5025_Mecisteus 09:29:18.9 +20:39:44 15.4 24 Positions are for equinox of date
Star training set for 5025_Mecisteus, (2025/03/09 11:10UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 13.10 36 4Lam Leo 09:31:43.2 +22:58:04 4.3 2.37 24 PPM 099647 09:31:34.8 +20:16:14 8.1 1.00 25 PPM 099605 09:28:44.1 +20:42:25 10.0 0.21 24 5025_Mecisteus 09:27:53.7 +20:46:23 15.4 24 Positions are for J2000