Occultation event with (23135) Pheidas, event index number 3763
Regions able to see the event: US
Geocentric closest approach at 2026/05/27 01:03:06 UTC
J2000 position of star is 11:57:27.0 -18:22:54
Equinox of date position of star is 11:58:48.1 -18:31:43
Star is 17 degrees from the moon. Moon is 84% illuminated.
Stellar brightness G=16.7, apparent brightess of occulting body is G=15.3
Use an exposure time of 1.80 seconds with the standard RECON-QHY system.
SNR of 3.4 per integration for unocculted signal
Expected flux drop is 21% with SNR of 0.7 for the occulted depth (per occulted point)
Apparent velocity is 9.0 km/sec on the sky relative to the star, or, 9.9 arcsec/hr.
Position angle of asteroid motion is 9.4 degrees
The recommended exposure time corresponds to 16.2 km per image.
The 1-sigma error in the time of the event is 4.2 seconds.
The 1-sigma cross-track error in the shadow position is 20.1 km.
The sky-plane scale is 3258.4 km/arcsec.
Diameter estimates:
60.0 km assuming a 5% albedo, maximum of 6.7 sec for a central chord
24.5 km assuming a 30% albedo, maximum of 2.7 sec for a central chord
Cross-track diameter of 66.2 km used for deployment plan.
Star training set for 23135_Pheidas, (2026/05/27 01:03UT) Object RA Dec mag sep mel Spica 13:26:35.3 -11:17:54 1.0 22.38 6 4Gam Crv 12:17:10.1 -17:41:18 2.6 4.44 13 30Eta Crt 11:57:21.9 -17:17:52 5.2 1.28 17 PPM 225177 11:59:13.9 -19:07:46 7.6 0.61 18 PPM 225152 11:58:28.9 -18:31:47 8.6 0.08 17 23135_Pheidas 11:58:48.1 -18:31:43 15.3 17 Positions are for equinox of date
Star training set for 23135_Pheidas, (2026/05/27 01:03UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 22.38 6 4Gam Crv 12:15:48.1 -17:32:30 2.6 4.44 13 30Eta Crt 11:56:00.9 -17:09:03 5.2 1.28 17 PPM 225177 11:57:52.8 -18:58:57 7.6 0.61 18 PPM 225152 11:57:07.9 -18:22:58 8.6 0.08 17 23135_Pheidas 11:57:27.0 -18:22:54 15.3 17 Positions are for J2000