Occultation event with (5258) Rhoeo, event index number 3813
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/06/30 00:46:16 UTC
J2000 position of star is 10:56:17.4 +01:02:07
Equinox of date position of star is 10:57:39.1 +00:53:36
Star is 113 degrees from the moon. Moon is 100% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 43% with SNR of 1.3 for the occulted depth (per occulted point)
Apparent velocity is 25.2 km/sec on the sky relative to the star, or, 24.0 arcsec/hr.
Position angle of asteroid motion is 106.5 degrees
The recommended exposure time corresponds to 16.4 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 30.7 km.
The sky-plane scale is 3772.8 km/arcsec.
Diameter estimates:
51.3 km assuming a 5% albedo, maximum of 2.0 sec for a central chord
20.9 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 53.3 km used for deployment plan.
Star training set for 5258_Rhoeo, (2026/06/30 00:46UT) Object RA Dec mag sep mel Regulus 10:09:46.8 +11:50:12 1.3 16.15 129 55 Leo 10:57:04.1 +00:35:42 6.2 0.33 113 PPM 157361 10:58:15.8 +00:55:15 11.1 0.16 113 5258_Rhoeo 10:57:39.1 +00:53:36 15.9 113 Positions are for equinox of date
Star training set for 5258_Rhoeo, (2026/06/30 00:46UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 16.15 129 55 Leo 10:55:42.5 +00:44:13 6.2 0.33 113 PPM 157361 10:56:54.2 +01:03:46 11.1 0.16 113 5258_Rhoeo 10:56:17.4 +01:02:07 15.9 113 Positions are for J2000