Occultation event with (5209) Oloosson, event index number 3698
Regions able to see the event: Australia
Geocentric closest approach at 2026/04/29 18:57:49 UTC
J2000 position of star is 13:10:39.3 -18:10:11
Equinox of date position of star is 13:12:03.8 -18:18:33
Star is 9 degrees from the moon. Moon is 96% illuminated.
Stellar brightness G=12.7, apparent brightess of occulting body is G=15.4
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 13.2 per integration for unocculted signal
Expected flux drop is 92% with SNR of 12.1 for the occulted depth (per occulted point)
Apparent velocity is 16.0 km/sec on the sky relative to the star, or, 17.9 arcsec/hr.
Position angle of asteroid motion is 113.8 degrees
The recommended exposure time corresponds to 1.9 km per image.
The 1-sigma error in the time of the event is 1.7 seconds.
The 1-sigma cross-track error in the shadow position is 21.6 km.
The sky-plane scale is 3223.3 km/arcsec.
Diameter estimates:
52.0 km assuming a 5% albedo, maximum of 3.2 sec for a central chord
21.2 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 48.2 km used for deployment plan.
Star training set for 5209_Oloosson, (2026/04/29 18:58UT) Object RA Dec mag sep mel Spica 13:26:35.0 -11:17:52 1.0 7.84 6 54 Vir 13:14:51.7 -18:57:52 6.1 0.93 9 PPM 226832 13:09:14.1 -18:08:40 8.2 0.69 8 PPM 226889 13:11:42.8 -18:17:20 10.0 0.09 9 5209_Oloosson 13:12:03.8 -18:18:33 15.4 9 Positions are for equinox of date
Star training set for 5209_Oloosson, (2026/04/29 18:58UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 7.84 6 54 Vir 13:13:26.9 -18:49:32 6.1 0.93 9 PPM 226832 13:07:49.7 -18:00:16 8.2 0.69 8 PPM 226889 13:10:18.3 -18:08:58 10.0 0.09 9 5209_Oloosson 13:10:39.3 -18:10:11 15.4 9 Positions are for J2000