Occultation event with (5258) Rhoeo, event index number 3803
Regions able to see the event: SAmericaS
Geocentric closest approach at 2026/06/23 01:04:09 UTC
J2000 position of star is 10:52:10.3 +01:19:45
Equinox of date position of star is 10:53:31.9 +01:11:17
Star is 31 degrees from the moon. Moon is 62% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=15.8
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 6.8 per integration for unocculted signal
Expected flux drop is 67% with SNR of 4.6 for the occulted depth (per occulted point)
Apparent velocity is 22.5 km/sec on the sky relative to the star, or, 21.9 arcsec/hr.
Position angle of asteroid motion is 105.3 degrees
The recommended exposure time corresponds to 12.4 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 31.5 km.
The sky-plane scale is 3698.1 km/arcsec.
Diameter estimates:
51.3 km assuming a 5% albedo, maximum of 2.3 sec for a central chord
20.9 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 53.3 km used for deployment plan.
Star training set for 5258_Rhoeo, (2026/06/23 01:04UT) Object RA Dec mag sep mel Regulus 10:09:46.8 +11:50:12 1.3 15.20 45 55 Leo 10:57:04.1 +00:35:43 6.2 1.06 30 PPM 157292 10:53:35.3 +00:53:03 6.6 0.30 31 PPM 157291 10:53:33.6 +01:14:24 9.5 0.05 31 5258_Rhoeo 10:53:31.9 +01:11:17 15.8 31 Positions are for equinox of date
Star training set for 5258_Rhoeo, (2026/06/23 01:04UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 15.20 45 55 Leo 10:55:42.5 +00:44:13 6.2 1.06 30 PPM 157292 10:52:13.7 +01:01:31 6.6 0.30 31 PPM 157291 10:52:12.0 +01:22:52 9.5 0.05 31 5258_Rhoeo 10:52:10.3 +01:19:45 15.8 31 Positions are for J2000