Occultation event with (5258) Rhoeo, event index number 3764
Regions able to see the event: Australia
Geocentric closest approach at 2026/05/28 14:35:13 UTC
J2000 position of star is 10:40:41.0 +01:57:06
Equinox of date position of star is 10:42:02.6 +01:48:47
Star is 56 degrees from the moon. Moon is 93% illuminated.
Stellar brightness G=14.8, apparent brightess of occulting body is G=15.7
Use an exposure time of 0.75 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 69% with SNR of 6.8 for the occulted depth (per occulted point)
Apparent velocity is 11.7 km/sec on the sky relative to the star, or, 12.4 arcsec/hr.
Position angle of asteroid motion is 96.7 degrees
The recommended exposure time corresponds to 8.8 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 34.1 km.
The sky-plane scale is 3412.6 km/arcsec.
Diameter estimates:
51.3 km assuming a 5% albedo, maximum of 4.4 sec for a central chord
20.9 km assuming a 30% albedo, maximum of 1.8 sec for a central chord
Cross-track diameter of 53.3 km used for deployment plan.
Star training set for 5258_Rhoeo, (2026/05/28 14:35UT) Object RA Dec mag sep mel Regulus 10:09:46.5 +11:50:14 1.3 12.82 67 30Bet Sex 10:31:38.4 -00:46:24 4.8 3.67 57 PPM 157111 10:44:44.1 +01:46:47 8.2 0.67 55 PPM 157055 10:41:17.4 +02:22:00 9.7 0.58 56 PPM 157081 10:42:30.0 +01:49:26 10.2 0.11 56 5258_Rhoeo 10:42:02.6 +01:48:47 15.7 55 Positions are for equinox of date
Star training set for 5258_Rhoeo, (2026/05/28 14:35UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 12.82 67 30Bet Sex 10:30:17.4 -00:38:14 4.8 3.67 57 PPM 157111 10:43:22.5 +01:55:07 8.2 0.67 55 PPM 157055 10:39:55.7 +02:30:18 9.7 0.58 56 PPM 157081 10:41:08.4 +01:57:44 10.2 0.11 56 5258_Rhoeo 10:40:41.0 +01:57:06 15.7 56 Positions are for J2000