Occultation event with (23135) Pheidas, event index number 3650
Regions able to see the event: Europe
Geocentric closest approach at 2026/04/17 20:05:42 UTC
J2000 position of star is 12:05:03.5 -21:29:20
Equinox of date position of star is 12:06:24.7 -21:38:07
Star is 153 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=14.5, apparent brightess of occulting body is G=14.8
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 9.6 per integration for unocculted signal
Expected flux drop is 57% with SNR of 5.5 for the occulted depth (per occulted point)
Apparent velocity is 15.7 km/sec on the sky relative to the star, or, 18.8 arcsec/hr.
Position angle of asteroid motion is 131.0 degrees
The recommended exposure time corresponds to 8.6 km per image.
The 1-sigma error in the time of the event is 2.4 seconds.
The 1-sigma cross-track error in the shadow position is 21.7 km.
The sky-plane scale is 3003.6 km/arcsec.
Diameter estimates:
60.0 km assuming a 5% albedo, maximum of 3.8 sec for a central chord
24.5 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 66.2 km used for deployment plan.
Star training set for 23135_Pheidas, (2026/04/17 20:06UT) Object RA Dec mag sep mel Spica 13:26:34.9 -11:17:52 1.0 21.79 171 4Gam Crv 12:17:09.7 -17:41:16 2.6 4.69 156 2Eps Crv 12:11:28.9 -22:45:57 3.0 1.63 154 PPM 259808 12:05:38.2 -21:11:08 8.1 0.48 153 PPM 259818 12:06:01.1 -21:29:43 8.6 0.17 153 23135_Pheidas 12:06:24.7 -21:38:07 14.8 154 Positions are for equinox of date
Star training set for 23135_Pheidas, (2026/04/17 20:06UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 21.79 171 4Gam Crv 12:15:48.1 -17:32:30 2.6 4.69 156 2Eps Crv 12:10:07.4 -22:37:11 3.0 1.63 154 PPM 259808 12:04:17.1 -21:02:21 8.1 0.48 153 PPM 259818 12:04:40.0 -21:20:56 8.6 0.17 153 23135_Pheidas 12:05:03.5 -21:29:20 14.8 153 Positions are for J2000