Occultation event with (23135) Pheidas, event index number 3616
Regions able to see the event: SAmericaS
Geocentric closest approach at 2026/04/12 02:23:41 UTC
J2000 position of star is 12:07:31.1 -21:56:58
Equinox of date position of star is 12:08:52.4 -22:05:44
Star is 120 degrees from the moon. Moon is 32% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=14.8
Use an exposure time of 1.30 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 17% with SNR of 0.5 for the occulted depth (per occulted point)
Apparent velocity is 16.2 km/sec on the sky relative to the star, or, 19.5 arcsec/hr.
Position angle of asteroid motion is 126.9 degrees
The recommended exposure time corresponds to 21.1 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 24.7 km.
The sky-plane scale is 2988.9 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, (2026/04/12 02:24UT) Object RA Dec mag sep mel Spica 13:26:34.9 -11:17:52 1.0 21.48 110 4Gam Crv 12:17:09.7 -17:41:16 2.6 4.82 121 2Eps Crv 12:11:28.9 -22:45:57 3.0 0.90 119 PPM 259884 12:08:33.2 -22:31:01 7.9 0.43 120 PPM 259907 12:09:33.0 -22:13:42 9.9 0.21 120 23135_Pheidas 12:08:52.4 -22:05:44 14.8 120 Positions are for equinox of date
Star training set for 23135_Pheidas, (2026/04/12 02:24UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 21.48 110 4Gam Crv 12:15:48.1 -17:32:30 2.6 4.82 121 2Eps Crv 12:10:07.4 -22:37:11 3.0 0.90 119 PPM 259884 12:07:11.9 -22:22:14 7.9 0.43 120 PPM 259907 12:08:11.6 -22:04:56 9.9 0.21 120 23135_Pheidas 12:07:31.1 -21:56:58 14.8 120 Positions are for J2000