Occultation event with (5209) Oloosson, event index number 3652
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/04/18 07:06:27 UTC
J2000 position of star is 13:16:15.8 -18:42:15
Equinox of date position of star is 13:17:40.6 -18:50:33
Star is 165 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=11.1, apparent brightess of occulting body is G=15.2
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 35.5 per integration for unocculted signal
Expected flux drop is 98% with SNR of 34.7 for the occulted depth (per occulted point)
Apparent velocity is 17.1 km/sec on the sky relative to the star, or, 19.3 arcsec/hr.
Position angle of asteroid motion is 110.0 degrees
The recommended exposure time corresponds to 2.1 km per image.
The 1-sigma error in the time of the event is 1.5 seconds.
The 1-sigma cross-track error in the shadow position is 23.5 km.
The sky-plane scale is 3201.6 km/arcsec.
Diameter estimates:
52.0 km assuming a 5% albedo, maximum of 3.0 sec for a central chord
21.2 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 48.2 km used for deployment plan.
Star training set for 5209_Oloosson, (2026/04/18 07:06UT) Object RA Dec mag sep mel Spica 13:26:34.9 -11:17:52 1.0 7.84 164 61 Vir 13:19:47.2 -18:27:24 4.7 0.63 165 54 Vir 13:14:51.6 -18:57:52 6.1 0.68 164 PPM 227044 13:17:40.6 -18:50:32 9.6 0.00 165 5209_Oloosson 13:17:40.6 -18:50:33 15.2 165 Positions are for equinox of date
Star training set for 5209_Oloosson, (2026/04/18 07:06UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 7.84 164 61 Vir 13:18:22.4 -18:19:08 4.7 0.63 165 54 Vir 13:13:26.9 -18:49:32 6.1 0.68 164 PPM 227044 13:16:15.8 -18:42:15 9.6 0.00 165 5209_Oloosson 13:16:15.8 -18:42:15 15.2 165 Positions are for J2000