Occultation event with (23135) Pheidas, event index number 716
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/02/26 03:59:41 UTC
J2000 position of star is 09:53:20.3 -09:38:32
Equinox of date position of star is 09:54:34.6 -09:45:42
Star is 148 degrees from the moon. Moon is 5% illuminated.
Stellar brightness G=14.6, apparent brightess of occulting body is G=14.8
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
Expected flux drop is 47% with SNR of 9.8 per integration
Apparent velocity is 16.4 km/sec on the sky relative to the star, or, 20.1 arcsec/hr.
The recommended exposure time corresponds to 10.7 km per image.
The 1-sigma error in the time of the event is 2.3 seconds.
The 1-sigma cross-track error in the shadow position is 23.0 km.
The sky-plane scale is 2948.7 km/arcsec.
Diameter estimates:
59.2 km assuming a 5% albedo, aximum of 3.6 sec for a central chord
24.1 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 59.2 km used for deployment plan.
Star training set for 23135_Pheidas, (2025/02/26 04:00UT) Object RA Dec mag sep mel Regulus 10:09:42.5 +11:50:36 1.3 21.93 163 Alphard 09:28:49.4 -08:46:08 2.0 6.43 150 8Gam Sex 09:53:45.2 -08:13:28 4.8 1.55 149 PPM 192858 09:54:36.1 -10:01:23 7.5 0.26 147 PPM 192853 09:54:16.5 -09:50:28 9.4 0.11 148 23135_Pheidas 09:54:34.6 -09:45:42 14.8 147 Positions are for equinox of date
Star training set for 23135_Pheidas, (2025/02/26 04:00UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 21.93 163 Alphard 09:27:35.2 -08:39:30 2.0 6.43 150 8Gam Sex 09:52:30.3 -08:06:19 4.8 1.55 149 PPM 192858 09:53:21.9 -09:54:13 7.5 0.26 147 PPM 192853 09:53:02.2 -09:43:19 9.4 0.11 148 23135_Pheidas 09:53:20.3 -09:38:32 14.8 148 Positions are for J2000