Occultation event with (23135) Pheidas, event index number 3686
Regions able to see the event: Australia
Geocentric closest approach at 2026/04/26 10:58:20 UTC
J2000 position of star is 12:01:53.6 -20:46:03
Equinox of date position of star is 12:03:14.7 -20:54:50
Star is 38 degrees from the moon. Moon is 74% illuminated.
Stellar brightness G=13.4, apparent brightess of occulting body is G=14.9
Use an exposure time of 0.15 seconds with the standard RECON-QHY system.
SNR of 9.7 per integration for unocculted signal
Expected flux drop is 81% with SNR of 7.9 for the occulted depth (per occulted point)
Apparent velocity is 14.4 km/sec on the sky relative to the star, or, 17.0 arcsec/hr.
Position angle of asteroid motion is 138.1 degrees
The recommended exposure time corresponds to 2.2 km per image.
The 1-sigma error in the time of the event is 2.7 seconds.
The 1-sigma cross-track error in the shadow position is 16.7 km.
The sky-plane scale is 3038.0 km/arcsec.
Diameter estimates:
60.0 km assuming a 5% albedo, maximum of 4.2 sec for a central chord
24.5 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 66.2 km used for deployment plan.
Star training set for 23135_Pheidas, (2026/04/26 10:58UT) Object RA Dec mag sep mel Spica 13:26:35.0 -11:17:52 1.0 22.17 48 4Gam Crv 12:17:09.8 -17:41:16 2.6 4.60 38 PPM 225249 12:02:12.1 -19:48:20 5.4 1.14 37 PPM 259766 12:03:23.6 -20:57:19 8.2 0.05 38 23135_Pheidas 12:03:14.7 -20:54:50 14.9 38 Positions are for equinox of date
Star training set for 23135_Pheidas, (2026/04/26 10:58UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 22.17 48 4Gam Crv 12:15:48.1 -17:32:30 2.6 4.60 38 PPM 225249 12:00:51.1 -19:39:32 5.4 1.14 37 PPM 259766 12:02:02.6 -20:48:31 8.2 0.05 38 23135_Pheidas 12:01:53.6 -20:46:03 14.9 38 Positions are for J2000