Occultation event with (4828) Misenus, event index number 1252
Regions able to see the event: SAfrica
Geocentric closest approach at 2025/08/26 01:30:46 UTC
J2000 position of star is 01:40:45.2 +19:02:50
Equinox of date position of star is 01:42:09.2 +19:10:34
Star is 155 degrees from the moon. Moon is 8% illuminated.
Stellar brightness G=15.2, apparent brightess of occulting body is G=15.8
Use an exposure time of 1.10 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 65% with SNR of 6.4 for the occulted depth (per occulted point)
Apparent velocity is 7.0 km/sec on the sky relative to the star, or, 7.6 arcsec/hr.
Position angle of asteroid motion is 128.9 degrees
The recommended exposure time corresponds to 7.8 km per image.
The 1-sigma error in the time of the event is 0.3 seconds.
The 1-sigma cross-track error in the shadow position is 23.2 km.
The sky-plane scale is 3322.6 km/arcsec.
Diameter estimates:
48.1 km assuming a 5% albedo, maximum of 6.8 sec for a central chord
19.6 km assuming a 30% albedo, maximum of 2.8 sec for a central chord
Cross-track diameter of 46.0 km used for deployment plan.
Star training set for 4828_Misenus, (2025/08/26 01:31UT) Object RA Dec mag sep mel Aldebaran 04:37:23.7 +16:33:31 0.8 41.67 116 6Bet Ari 01:56:03.8 +20:55:56 2.6 3.71 151 107 Psc 01:43:53.6 +20:23:32 6.0 1.28 154 PPM 117566 01:42:14.7 +19:30:01 8.1 0.32 155 PPM 117586 01:43:12.8 +19:10:23 9.7 0.25 155 4828_Misenus 01:42:09.2 +19:10:34 15.8 155 Positions are for equinox of date
Star training set for 4828_Misenus, (2025/08/26 01:31UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 41.67 116 6Bet Ari 01:54:38.6 +20:48:26 2.6 3.71 151 107 Psc 01:42:29.2 +20:15:49 6.0 1.28 154 PPM 117566 01:40:50.6 +19:22:17 8.1 0.32 155 PPM 117586 01:41:48.8 +19:02:40 9.7 0.25 155 4828_Misenus 01:40:45.2 +19:02:50 15.8 155 Positions are for J2000