Occultation event with (5209) Oloosson, event index number 3925
Regions able to see the event: Australia
Geocentric closest approach at 2026/08/02 10:10:26 UTC
J2000 position of star is 13:12:38.8 -16:35:36
Equinox of date position of star is 13:14:03.9 -16:44:02
Star is 151 degrees from the moon. Moon is 86% illuminated.
Stellar brightness G=16.6, apparent brightess of occulting body is G=16.2
Use an exposure time of 1.10 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 41% with SNR of 1.2 for the occulted depth (per occulted point)
Apparent velocity is 21.2 km/sec on the sky relative to the star, or, 18.7 arcsec/hr.
Position angle of asteroid motion is 104.2 degrees
The recommended exposure time corresponds to 23.3 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 25.4 km.
The sky-plane scale is 4085.4 km/arcsec.
Diameter estimates:
52.0 km assuming a 5% albedo, maximum of 2.5 sec for a central chord
21.2 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 48.2 km used for deployment plan.
Star training set for 5209_Oloosson, (2026/08/02 10:10UT) Object RA Dec mag sep mel Spica 13:26:35.9 -11:17:57 1.0 6.23 151 53 Vir 13:13:28.7 -16:20:28 4.8 0.42 151 PPM 226981 13:15:34.8 -16:42:00 8.2 0.36 150 PPM 226930 13:13:18.0 -16:39:15 8.9 0.20 151 5209_Oloosson 13:14:03.9 -16:44:02 16.2 150 Positions are for equinox of date
Star training set for 5209_Oloosson, (2026/08/02 10:10UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 6.23 151 53 Vir 13:12:03.7 -16:12:02 4.8 0.42 151 PPM 226981 13:14:09.7 -16:33:35 8.2 0.36 150 PPM 226930 13:11:52.9 -16:30:49 8.9 0.20 151 5209_Oloosson 13:12:38.8 -16:35:36 16.2 151 Positions are for J2000