Occultation event with (5209) Oloosson, event index number 3847
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/07/15 01:22:04 UTC
J2000 position of star is 13:04:49.8 -16:11:53
Equinox of date position of star is 13:06:14.3 -16:20:23
Star is 80 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=16.7, apparent brightess of occulting body is G=16.1
Use an exposure time of 1.25 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 37% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 13.4 km/sec on the sky relative to the star, or, 12.4 arcsec/hr.
Position angle of asteroid motion is 98.3 degrees
The recommended exposure time corresponds to 16.7 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 27.5 km.
The sky-plane scale is 3880.6 km/arcsec.
Diameter estimates:
52.0 km assuming a 5% albedo, maximum of 3.9 sec for a central chord
21.2 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 48.2 km used for deployment plan.
Star training set for 5209_Oloosson, (2026/07/15 01:22UT) Object RA Dec mag sep mel Spica 13:26:35.7 -11:17:56 1.0 7.06 82 53 Vir 13:13:28.6 -16:20:27 4.8 1.74 82 PPM 226709 13:04:22.0 -17:01:25 7.1 0.82 80 PPM 226772 13:06:49.4 -16:14:16 9.5 0.17 80 5209_Oloosson 13:06:14.3 -16:20:23 16.1 80 Positions are for equinox of date
Star training set for 5209_Oloosson, (2026/07/15 01:22UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 7.06 82 53 Vir 13:12:03.7 -16:12:02 4.8 1.74 82 PPM 226709 13:02:57.4 -16:52:53 7.1 0.82 80 PPM 226772 13:05:24.9 -16:05:46 9.5 0.17 80 5209_Oloosson 13:04:49.8 -16:11:53 16.1 80 Positions are for J2000