Occultation event with (5209) Oloosson, event index number 728
Regions able to see the event: Australia
Geocentric closest approach at 2025/02/27 17:18:07 UTC
J2000 position of star is 11:35:18.6 -03:21:15
Equinox of date position of star is 11:36:35.8 -03:29:37
Star is 158 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=15.6, apparent brightess of occulting body is G=15.3
Use an exposure time of 0.75 seconds with the standard RECON-QHY system.
Expected flux drop is 58% with SNR of 5.2 per integration
Apparent velocity is 16.2 km/sec on the sky relative to the star, or, 18.6 arcsec/hr.
The recommended exposure time corresponds to 12.1 km per image.
The 1-sigma error in the time of the event is 2.4 seconds.
The 1-sigma cross-track error in the shadow position is 25.3 km.
The sky-plane scale is 3128.1 km/arcsec.
Diameter estimates:
51.3 km assuming a 5% albedo, aximum of 3.2 sec for a central chord
20.9 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 51.3 km used for deployment plan.
Star training set for 5209_Oloosson, (2025/02/27 17:18UT) Object RA Dec mag sep mel Regulus 10:09:42.6 +11:50:36 1.3 26.49 174 4Gam Crv 12:17:06.2 -17:40:53 2.6 17.32 141 PPM 194612 11:36:15.9 -04:30:03 6.4 1.01 158 PPM 178534 11:36:04.5 -02:37:49 8.4 0.87 159 PPM 194596 11:35:38.3 -03:38:34 9.4 0.28 158 5209_Oloosson 11:36:35.8 -03:29:37 15.3 158 Positions are for equinox of date
Star training set for 5209_Oloosson, (2025/02/27 17:18UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 26.49 174 4Gam Crv 12:15:48.1 -17:32:30 2.6 17.32 141 PPM 194612 11:34:58.8 -04:21:42 6.4 1.01 158 PPM 178534 11:34:47.3 -02:29:27 8.4 0.87 159 PPM 194596 11:34:21.2 -03:30:13 9.4 0.28 158 5209_Oloosson 11:35:18.6 -03:21:15 15.3 158 Positions are for J2000