Occultation event with (5209) Oloosson, event index number 868
Regions able to see the event: Europe
Geocentric closest approach at 2025/03/30 21:13:08 UTC
J2000 position of star is 11:19:53.1 -02:08:36
Equinox of date position of star is 11:21:10.5 -02:16:55
Star is 141 degrees from the moon. Moon is 3% illuminated.
Stellar brightness G=14.5, apparent brightess of occulting body is G=15.3
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
Expected flux drop is 32% with SNR of 9.7 per integration
Apparent velocity is 15.7 km/sec on the sky relative to the star, or, 18.0 arcsec/hr.
The recommended exposure time corresponds to 7.9 km per image.
The 1-sigma error in the time of the event is 2.4 seconds.
The 1-sigma cross-track error in the shadow position is 29.7 km.
The sky-plane scale is 3136.7 km/arcsec.
Diameter estimates:
51.3 km assuming a 5% albedo, aximum of 3.3 sec for a central chord
20.9 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 51.3 km used for deployment plan.
Star training set for 5209_Oloosson, (2025/03/30 21:13UT) Object RA Dec mag sep mel Regulus 10:09:42.8 +11:50:34 1.3 22.69 119 Denebola 11:50:20.8 +14:25:51 2.1 18.21 138 69 Leo 11:15:03.1 -00:12:26 5.3 2.58 139 PPM 178459 11:21:41.3 -01:56:08 8.5 0.37 141 PPM 178454 11:20:47.4 -02:06:52 10.1 0.19 141 5209_Oloosson 11:21:10.5 -02:16:55 15.3 141 Positions are for equinox of date
Star training set for 5209_Oloosson, (2025/03/30 21:13UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 22.69 119 Denebola 11:49:02.7 +14:34:17 2.1 18.21 138 69 Leo 11:13:45.5 -00:04:10 5.3 2.58 139 PPM 178459 11:20:23.8 -01:47:49 8.5 0.37 141 PPM 178454 11:19:30.0 -01:58:34 10.1 0.19 141 5209_Oloosson 11:19:53.1 -02:08:36 15.3 141 Positions are for J2000