Occultation event with (5209) Oloosson, event index number 3399
Regions able to see the event: SMexico
Geocentric closest approach at 2026/03/11 09:32:29 UTC
J2000 position of star is 13:34:00.6 -19:41:20
Equinox of date position of star is 13:35:26.2 -19:49:20
Star is 51 degrees from the moon. Moon is 50% illuminated.
Stellar brightness G=16.8, apparent brightess of occulting body is G=15.6
Use an exposure time of 1.55 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 25% with SNR of 0.8 for the occulted depth (per occulted point)
Apparent velocity is 11.4 km/sec on the sky relative to the star, or, 12.3 arcsec/hr.
Position angle of asteroid motion is 92.2 degrees
The recommended exposure time corresponds to 17.6 km per image.
The 1-sigma error in the time of the event is 1.4 seconds.
The 1-sigma cross-track error in the shadow position is 30.6 km.
The sky-plane scale is 3329.3 km/arcsec.
Diameter estimates:
52.0 km assuming a 5% albedo, maximum of 4.6 sec for a central chord
21.2 km assuming a 30% albedo, maximum of 1.9 sec for a central chord
Cross-track diameter of 48.2 km used for deployment plan.
Star training set for 5209_Oloosson, (2026/03/11 09:32UT) Object RA Dec mag sep mel Spica 13:26:34.6 -11:17:50 1.0 8.79 57 73 Vir 13:33:27.9 -18:51:47 6.0 1.07 52 PPM 227476 13:34:37.0 -20:07:27 7.4 0.36 52 PPM 227463 13:34:18.1 -19:56:11 9.7 0.29 52 5209_Oloosson 13:35:26.2 -19:49:20 15.6 51 Positions are for equinox of date
Star training set for 5209_Oloosson, (2026/03/11 09:32UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 8.79 57 73 Vir 13:32:02.6 -18:43:44 6.0 1.07 52 PPM 227476 13:33:11.3 -19:59:26 7.4 0.36 52 PPM 227463 13:32:52.5 -19:48:09 9.7 0.29 52 5209_Oloosson 13:34:00.6 -19:41:20 15.6 51 Positions are for J2000