Occultation event with (5209) Oloosson, event index number 895
Regions able to see the event: NZ
Geocentric closest approach at 2025/04/10 07:54:33 UTC
J2000 position of star is 11:15:33.8 -01:43:48
Equinox of date position of star is 11:16:51.3 -01:52:06
Star is 7 degrees from the moon. Moon is 94% illuminated.
Stellar brightness G=15.4, apparent brightess of occulting body is G=15.4
Use an exposure time of 0.95 seconds with the standard RECON-QHY system.
SNR of 7.0 per integration for unocculted signal
Expected flux drop is 50% with SNR of 3.5 for the occulted depth (per occulted point)
Apparent velocity is 13.3 km/sec on the sky relative to the star, or, 15.0 arcsec/hr.
The recommended exposure time corresponds to 12.6 km per image.
The 1-sigma error in the time of the event is 3.1 seconds.
The 1-sigma cross-track error in the shadow position is 25.4 km.
The sky-plane scale is 3186.5 km/arcsec.
Diameter estimates:
51.5 km assuming a 5% albedo, aximum of 3.9 sec for a central chord
21.0 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 51.5 km used for deployment plan.
Star training set for 5209_Oloosson, (2025/04/10 07:55UT) Object RA Dec mag sep mel Regulus 10:09:42.9 +11:50:34 1.3 21.59 22 Denebola 11:50:20.8 +14:25:50 2.1 18.29 12 69 Leo 11:15:03.2 -00:12:27 5.3 1.72 6 PPM 178434 11:15:55.3 -01:24:33 7.6 0.51 6 PPM 178440 11:17:27.6 -01:53:07 9.1 0.15 7 5209_Oloosson 11:16:51.3 -01:52:06 15.4 7 Positions are for equinox of date
Star training set for 5209_Oloosson, (2025/04/10 07:55UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 21.59 22 Denebola 11:49:02.7 +14:34:16 2.1 18.29 12 69 Leo 11:13:45.5 -00:04:10 5.3 1.72 6 PPM 178434 11:14:37.8 -01:16:16 7.6 0.51 6 PPM 178440 11:16:10.0 -01:44:49 9.1 0.15 7 5209_Oloosson 11:15:33.8 -01:43:48 15.4 7 Positions are for J2000