Occultation event with (5209) Oloosson, event index number 3832
Regions able to see the event: SAmericaS
Geocentric closest approach at 2026/07/06 23:27:38 UTC
J2000 position of star is 13:02:24.0 -16:08:13
Equinox of date position of star is 13:03:48.3 -16:16:44
Star is 163 degrees from the moon. Moon is 59% illuminated.
Stellar brightness G=16.3, apparent brightess of occulting body is G=16.1
Use an exposure time of 1.20 seconds with the standard RECON-QHY system.
SNR of 4.0 per integration for unocculted signal
Expected flux drop is 44% with SNR of 1.8 for the occulted depth (per occulted point)
Apparent velocity is 9.8 km/sec on the sky relative to the star, or, 9.4 arcsec/hr.
Position angle of asteroid motion is 92.8 degrees
The recommended exposure time corresponds to 11.8 km per image.
The 1-sigma error in the time of the event is 1.8 seconds.
The 1-sigma cross-track error in the shadow position is 29.1 km.
The sky-plane scale is 3789.2 km/arcsec.
Diameter estimates:
52.0 km assuming a 5% albedo, maximum of 5.3 sec for a central chord
21.2 km assuming a 30% albedo, maximum of 2.2 sec for a central chord
Cross-track diameter of 48.2 km used for deployment plan.
Star training set for 5209_Oloosson, (2026/07/06 23:28UT) Object RA Dec mag sep mel Spica 13:26:35.6 -11:17:56 1.0 7.44 161 PPM 226546 12:57:17.1 -15:28:12 6.2 1.76 165 PPM 226681 13:03:08.5 -16:43:21 8.1 0.47 163 PPM 226699 13:03:55.4 -16:20:38 9.3 0.07 163 5209_Oloosson 13:03:48.3 -16:16:44 16.1 163 Positions are for equinox of date
Star training set for 5209_Oloosson, (2026/07/06 23:28UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 7.44 161 PPM 226546 12:55:53.2 -15:19:37 6.2 1.76 165 PPM 226681 13:01:44.1 -16:34:49 8.1 0.47 163 PPM 226699 13:02:31.0 -16:12:07 9.3 0.07 163 5209_Oloosson 13:02:24.0 -16:08:13 16.1 163 Positions are for J2000