Occultation event with (5209) Oloosson, event index number 724
Regions able to see the event: SAmericaS
Geocentric closest approach at 2025/02/27 01:31:31 UTC
J2000 position of star is 11:35:37.6 -03:22:26
Equinox of date position of star is 11:36:54.7 -03:30:47
Star is 149 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=15.2, 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 47% with SNR of 7.5 per integration
Apparent velocity is 16.1 km/sec on the sky relative to the star, or, 18.5 arcsec/hr.
The recommended exposure time corresponds to 12.0 km per image.
The 1-sigma error in the time of the event is 2.5 seconds.
The 1-sigma cross-track error in the shadow position is 24.3 km.
The sky-plane scale is 3130.2 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 01:32UT) Object RA Dec mag sep mel Regulus 10:09:42.5 +11:50:36 1.3 26.56 175 4Gam Crv 12:17:06.2 -17:40:53 2.6 17.25 132 PPM 194612 11:36:15.9 -04:30:03 6.4 1.00 148 PPM 178534 11:36:04.5 -02:37:49 8.4 0.91 150 PPM 178540 11:37:10.9 -03:15:11 9.9 0.27 149 5209_Oloosson 11:36:54.7 -03:30:47 15.3 148 Positions are for equinox of date
This table contains the target star visibility for registered SAmericaS sites that are relevant for this occultation. This list has been filtered to only those sites that can see the field and are within range of the shadow given the uncertainties. The observing time range has been calculated to cover the time of the event at each site with allowances for the event timing uncertainty plus time for obtaining a pre and post event baseline lightcurve. This set of stations has a 0.0 % chance of getting at least one chord. There is a 0.0% chance of 2 or more chords assuming clear weather for all.
| Site Name | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time | Xtrack (km) |
Prob |
|---|---|---|---|---|---|---|---|---|---|---|
Star training set for 5209_Oloosson, (2025/02/27 01:32UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 26.56 175 4Gam Crv 12:15:48.1 -17:32:30 2.6 17.25 132 PPM 194612 11:34:58.8 -04:21:42 6.4 1.00 148 PPM 178534 11:34:47.3 -02:29:27 8.4 0.91 150 PPM 178540 11:35:53.7 -03:06:49 9.9 0.27 149 5209_Oloosson 11:35:37.6 -03:22:26 15.3 149 Positions are for J2000