Occultation event with (5209) Oloosson, event index number 1188
Regions able to see the event: SMexico
Geocentric closest approach at 2025/04/20 08:26:14 UTC
J2000 position of star is 11:12:19.0 -01:23:29
Equinox of date position of star is 11:13:36.7 -01:31:46
Star is 122 degrees from the moon. Moon is 58% illuminated.
Stellar brightness G=16.6, apparent brightess of occulting body is G=15.5
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 27% with SNR of 0.8 for the occulted depth (per occulted point)
Apparent velocity is 10.1 km/sec on the sky relative to the star, or, 11.2 arcsec/hr.
The recommended exposure time corresponds to 12.7 km per image.
The 1-sigma error in the time of the event is 3.8 seconds.
The 1-sigma cross-track error in the shadow position is 34.1 km.
The sky-plane scale is 3253.2 km/arcsec.
Diameter estimates:
51.8 km assuming a 5% albedo, aximum of 5.1 sec for a central chord
21.1 km assuming a 30% albedo, maximum of 2.1 sec for a central chord
Cross-track diameter of 51.8 km used for deployment plan.
Star training set for 5209_Oloosson, (2025/04/20 08:26UT) Object RA Dec mag sep mel Regulus 10:09:43.0 +11:50:33 1.3 20.75 142 Denebola 11:50:20.9 +14:25:50 2.1 18.37 121 69 Leo 11:15:03.2 -00:12:27 5.3 1.37 122 PPM 178424 11:13:34.1 -01:19:34 8.5 0.20 122 5209_Oloosson 11:13:36.7 -01:31:46 15.5 121 Positions are for equinox of date
Star training set for 5209_Oloosson, (2025/04/20 08:26UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 20.75 142 Denebola 11:49:02.7 +14:34:16 2.1 18.37 121 69 Leo 11:13:45.5 -00:04:10 5.3 1.37 122 PPM 178424 11:12:16.5 -01:11:18 8.5 0.20 122 5209_Oloosson 11:12:19.0 -01:23:29 15.5 122 Positions are for J2000