Occultation event with (5209) Oloosson, event index number 3815
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2026/06/30 01:01:43 UTC
J2000 position of star is 13:00:51.4 -16:08:34
Equinox of date position of star is 13:02:15.6 -16:17:06
Star is 78 degrees from the moon. Moon is 100% illuminated.
Stellar brightness G=14.5, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
SNR of 9.6 per integration for unocculted signal
Expected flux drop is 79% with SNR of 7.6 for the occulted depth (per occulted point)
Apparent velocity is 6.9 km/sec on the sky relative to the star, or, 6.7 arcsec/hr.
Position angle of asteroid motion is 84.0 degrees
The recommended exposure time corresponds to 3.5 km per image.
The 1-sigma error in the time of the event is 1.9 seconds.
The 1-sigma cross-track error in the shadow position is 32.4 km.
The sky-plane scale is 3711.8 km/arcsec.
Diameter estimates:
52.0 km assuming a 5% albedo, maximum of 7.5 sec for a central chord
21.2 km assuming a 30% albedo, maximum of 3.1 sec for a central chord
Cross-track diameter of 48.2 km used for deployment plan.
Star training set for 5209_Oloosson, (2026/06/30 01:02UT) Object RA Dec mag sep mel Spica 13:26:35.6 -11:17:56 1.0 7.73 75 PPM 226546 12:57:17.1 -15:28:12 6.2 1.45 79 PPM 226681 13:03:08.4 -16:43:21 8.1 0.49 78 PPM 226679 13:03:00.3 -16:07:52 9.1 0.24 78 5209_Oloosson 13:02:15.6 -16:17:06 16.0 78 Positions are for equinox of date
Star training set for 5209_Oloosson, (2026/06/30 01:02UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 7.73 75 PPM 226546 12:55:53.2 -15:19:37 6.2 1.45 79 PPM 226681 13:01:44.1 -16:34:49 8.1 0.49 78 PPM 226679 13:01:36.1 -15:59:21 9.1 0.24 78 5209_Oloosson 13:00:51.4 -16:08:34 16.0 78 Positions are for J2000