Occultation event with (23135) Pheidas, event index number 3631
Regions able to see the event: Europe,Australia
Geocentric closest approach at 2026/04/14 18:40:33 UTC
J2000 position of star is 12:06:20.3 -21:44:15
Equinox of date position of star is 12:07:41.6 -21:53:02
Star is 152 degrees from the moon. Moon is 10% illuminated.
Stellar brightness G=15.2, apparent brightess of occulting body is G=14.8
Use an exposure time of 1.00 seconds with the standard RECON-QHY system.
SNR of 8.5 per integration for unocculted signal
Expected flux drop is 42% with SNR of 3.6 for the occulted depth (per occulted point)
Apparent velocity is 16.0 km/sec on the sky relative to the star, or, 19.2 arcsec/hr.
Position angle of asteroid motion is 128.7 degrees
The recommended exposure time corresponds to 16.0 km per image.
The 1-sigma error in the time of the event is 2.2 seconds.
The 1-sigma cross-track error in the shadow position is 23.0 km.
The sky-plane scale is 2994.9 km/arcsec.
Diameter estimates:
60.0 km assuming a 5% albedo, maximum of 3.7 sec for a central chord
24.5 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 66.2 km used for deployment plan.
Star training set for 23135_Pheidas, (2026/04/14 18:41UT) Object RA Dec mag sep mel Spica 13:26:34.9 -11:17:52 1.0 21.63 145 4Gam Crv 12:17:09.7 -17:41:16 2.6 4.75 154 2Eps Crv 12:11:28.9 -22:45:57 3.0 1.24 151 PPM 259884 12:08:33.2 -22:31:01 7.9 0.66 151 PPM 259854 12:07:26.6 -21:49:06 9.0 0.09 152 23135_Pheidas 12:07:41.6 -21:53:02 14.8 152 Positions are for equinox of date
Star training set for 23135_Pheidas, (2026/04/14 18:41UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 21.63 145 4Gam Crv 12:15:48.1 -17:32:30 2.6 4.75 154 2Eps Crv 12:10:07.4 -22:37:11 3.0 1.24 151 PPM 259884 12:07:11.9 -22:22:14 7.9 0.66 151 PPM 259854 12:06:05.4 -21:40:20 9.0 0.09 152 23135_Pheidas 12:06:20.3 -21:44:15 14.8 152 Positions are for J2000