Occultation event with (5209) Oloosson, event index number 3757
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/05/22 04:42:46 UTC
J2000 position of star is 13:02:21.7 -17:07:16
Equinox of date position of star is 13:03:45.8 -17:15:45
Star is 67 degrees from the moon. Moon is 36% illuminated.
Stellar brightness G=16.7, apparent brightess of occulting body is G=15.6
Use an exposure time of 1.35 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 28% with SNR of 0.9 for the occulted depth (per occulted point)
Apparent velocity is 10.5 km/sec on the sky relative to the star, or, 11.4 arcsec/hr.
Position angle of asteroid motion is 124.1 degrees
The recommended exposure time corresponds to 14.2 km per image.
The 1-sigma error in the time of the event is 2.9 seconds.
The 1-sigma cross-track error in the shadow position is 16.2 km.
The sky-plane scale is 3341.3 km/arcsec.
Diameter estimates:
52.0 km assuming a 5% albedo, maximum of 4.9 sec for a central chord
21.2 km assuming a 30% albedo, maximum of 2.0 sec for a central chord
Cross-track diameter of 48.2 km used for deployment plan.
Star training set for 5209_Oloosson, (2026/05/22 04:43UT) Object RA Dec mag sep mel Spica 13:26:35.2 -11:17:54 1.0 8.13 69 PPM 226546 12:57:16.7 -15:28:10 6.2 2.37 64 PPM 226709 13:04:21.5 -17:01:22 7.1 0.28 67 PPM 226693 13:03:45.0 -17:24:36 9.4 0.15 67 5209_Oloosson 13:03:45.8 -17:15:45 15.6 67 Positions are for equinox of date
Star training set for 5209_Oloosson, (2026/05/22 04:43UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 8.13 69 PPM 226546 12:55:53.2 -15:19:37 6.2 2.37 64 PPM 226709 13:02:57.4 -16:52:53 7.1 0.28 67 PPM 226693 13:02:20.9 -17:16:07 9.4 0.15 67 5209_Oloosson 13:02:21.7 -17:07:16 15.6 67 Positions are for J2000