Occultation event with (23135) Pheidas, event index number 3700
Regions able to see the event: Australia
Geocentric closest approach at 2026/04/30 11:28:35 UTC
J2000 position of star is 12:00:40.4 -20:25:40
Equinox of date position of star is 12:02:01.5 -20:34:28
Star is 23 degrees from the moon. Moon is 98% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=15.0
Use an exposure time of 1.20 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 20% with SNR of 0.6 for the occulted depth (per occulted point)
Apparent velocity is 13.6 km/sec on the sky relative to the star, or, 16.1 arcsec/hr.
Position angle of asteroid motion is 142.0 degrees
The recommended exposure time corresponds to 16.4 km per image.
The 1-sigma error in the time of the event is 3.0 seconds.
The 1-sigma cross-track error in the shadow position is 14.1 km.
The sky-plane scale is 3058.7 km/arcsec.
Diameter estimates:
60.0 km assuming a 5% albedo, maximum of 4.4 sec for a central chord
24.5 km assuming a 30% albedo, maximum of 1.8 sec for a central chord
Cross-track diameter of 66.2 km used for deployment plan.
Star training set for 23135_Pheidas, (2026/04/30 11:29UT) Object RA Dec mag sep mel Spica 13:26:35.0 -11:17:52 1.0 22.31 3 4Gam Crv 12:17:09.8 -17:41:17 2.6 4.60 19 PPM 225249 12:02:12.2 -19:48:20 5.4 0.77 22 PPM 259757 12:02:44.3 -20:48:38 7.7 0.29 23 PPM 259738 12:01:57.5 -20:25:01 9.9 0.16 23 23135_Pheidas 12:02:01.5 -20:34:28 15.0 22 Positions are for equinox of date
Star training set for 23135_Pheidas, (2026/04/30 11:29UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 22.31 3 4Gam Crv 12:15:48.1 -17:32:30 2.6 4.60 19 PPM 225249 12:00:51.1 -19:39:32 5.4 0.77 22 PPM 259757 12:01:23.3 -20:39:50 7.7 0.29 23 PPM 259738 12:00:36.5 -20:16:14 9.9 0.16 23 23135_Pheidas 12:00:40.4 -20:25:40 15.0 23 Positions are for J2000