Occultation event with (5025) Mecisteus, event index number 3237
Regions able to see the event: Europe
Geocentric closest approach at 2026/02/11 22:37:32 UTC
J2000 position of star is 11:48:53.8 +00:19:09
Equinox of date position of star is 11:50:14.1 +00:10:27
Star is 82 degrees from the moon. Moon is 28% illuminated.
Stellar brightness G=13.1, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 10.4 per integration for unocculted signal
Expected flux drop is 91% with SNR of 9.4 for the occulted depth (per occulted point)
Apparent velocity is 12.6 km/sec on the sky relative to the star, or, 14.1 arcsec/hr.
Position angle of asteroid motion is 101.2 degrees
The recommended exposure time corresponds to 1.5 km per image.
The 1-sigma error in the time of the event is 2.1 seconds.
The 1-sigma cross-track error in the shadow position is 25.5 km.
The sky-plane scale is 3222.6 km/arcsec.
Diameter estimates:
50.1 km assuming a 5% albedo, maximum of 4.0 sec for a central chord
20.5 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 39.8 km used for deployment plan.
Star training set for 5025_Mecisteus, (2026/02/11 22:38UT) Object RA Dec mag sep mel Spica 13:26:34.4 -11:17:48 1.0 26.54 56 Denebola 11:50:23.4 +14:25:34 2.1 14.25 89 5Bet Vir 11:52:03.3 +01:37:03 3.6 1.51 82 PPM 158301 11:55:10.5 +00:24:25 6.6 1.26 81 PPM 158193 11:47:52.1 +00:12:35 9.7 0.59 83 PPM 158219 11:49:00.6 +00:28:05 11.6 0.42 82 5025_Mecisteus 11:50:14.1 +00:10:27 15.5 82 Positions are for equinox of date
Star training set for 5025_Mecisteus, (2026/02/11 22:38UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 26.54 56 Denebola 11:49:02.7 +14:34:16 2.1 14.25 89 5Bet Vir 11:50:43.0 +01:45:46 3.6 1.51 82 PPM 158301 11:53:50.2 +00:33:08 6.6 1.26 81 PPM 158193 11:46:31.8 +00:21:18 9.7 0.59 83 PPM 158219 11:47:40.2 +00:36:47 11.6 0.42 82 5025_Mecisteus 11:48:53.8 +00:19:09 15.5 82 Positions are for J2000