Occultation event with (5209) Oloosson, event index number 3722
Regions able to see the event: Europe
Geocentric closest approach at 2026/05/06 23:38:35 UTC
J2000 position of star is 13:07:31.4 -17:49:18
Equinox of date position of star is 13:08:55.8 -17:57:43
Star is 81 degrees from the moon. Moon is 77% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.80 seconds with the standard RECON-QHY system.
SNR of 4.2 per integration for unocculted signal
Expected flux drop is 40% with SNR of 1.7 for the occulted depth (per occulted point)
Apparent velocity is 14.7 km/sec on the sky relative to the star, or, 16.3 arcsec/hr.
Position angle of asteroid motion is 116.4 degrees
The recommended exposure time corresponds to 11.8 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 20.4 km.
The sky-plane scale is 3250.9 km/arcsec.
Diameter estimates:
52.0 km assuming a 5% albedo, maximum of 3.5 sec for a central chord
21.2 km assuming a 30% albedo, maximum of 1.4 sec for a central chord
Cross-track diameter of 48.2 km used for deployment plan.
Star training set for 5209_Oloosson, (2026/05/06 23:39UT) Object RA Dec mag sep mel Spica 13:26:35.1 -11:17:53 1.0 7.91 80 54 Vir 13:14:51.8 -18:57:53 6.1 1.73 79 PPM 226832 13:09:14.1 -18:08:40 8.2 0.20 81 5209_Oloosson 13:08:55.8 -17:57:43 15.5 81 Positions are for equinox of date
Star training set for 5209_Oloosson, (2026/05/06 23:39UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 7.91 80 54 Vir 13:13:26.9 -18:49:32 6.1 1.73 79 PPM 226832 13:07:49.7 -18:00:16 8.2 0.20 81 5209_Oloosson 13:07:31.4 -17:49:18 15.5 81 Positions are for J2000