Occultation event with (23135) Pheidas, event index number 3301
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/02/23 21:49:36 UTC
J2000 position of star is 12:29:23.2 -23:57:49
Equinox of date position of star is 12:30:45.7 -24:06:28
Star is 138 degrees from the moon. Moon is 43% illuminated.
Stellar brightness G=16.7, apparent brightess of occulting body is G=15.1
Use an exposure time of 1.60 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 18% with SNR of 0.5 for the occulted depth (per occulted point)
Apparent velocity is 10.1 km/sec on the sky relative to the star, or, 11.7 arcsec/hr.
Position angle of asteroid motion is 88.3 degrees
The recommended exposure time corresponds to 16.2 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 41.1 km.
The sky-plane scale is 3121.2 km/arcsec.
Diameter estimates:
60.0 km assuming a 5% albedo, maximum of 5.9 sec for a central chord
24.5 km assuming a 30% albedo, maximum of 2.4 sec for a central chord
Cross-track diameter of 66.2 km used for deployment plan.
Star training set for 23135_Pheidas, (2026/02/23 21:50UT) Object RA Dec mag sep mel Spica 13:26:34.5 -11:17:49 1.0 18.43 147 9Bet Crv 12:35:46.0 -23:32:28 2.6 1.28 139 PPM 260421 12:31:39.9 -23:50:27 5.1 0.34 138 PPM 260340 12:27:41.6 -24:25:01 8.3 0.76 137 PPM 260413 12:31:15.0 -23:56:54 9.4 0.19 138 23135_Pheidas 12:30:45.7 -24:06:28 15.1 138 Positions are for equinox of date
Star training set for 23135_Pheidas, (2026/02/23 21:50UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 18.43 147 9Bet Crv 12:34:23.2 -23:23:50 2.6 1.28 139 PPM 260421 12:30:17.4 -23:41:48 5.1 0.34 138 PPM 260340 12:26:19.4 -24:16:21 8.3 0.76 137 PPM 260413 12:29:52.5 -23:48:15 9.4 0.19 138 23135_Pheidas 12:29:23.2 -23:57:49 15.1 138 Positions are for J2000