Occultation event with (4501) Eurypylos, event index number 892
Regions able to see the event: Australia
Geocentric closest approach at 2025/04/09 13:32:51 UTC
J2000 position of star is 10:23:31.2 -00:14:23
Equinox of date position of star is 10:24:48.8 -00:22:05
Star is 12 degrees from the moon. Moon is 90% illuminated.
Stellar brightness G=15.6, apparent brightess of occulting body is G=15.7
Use an exposure time of 1.15 seconds with the standard RECON-QHY system.
SNR of 7.0 per integration for unocculted signal
Expected flux drop is 53% with SNR of 3.7 for the occulted depth (per occulted point)
Apparent velocity is 10.1 km/sec on the sky relative to the star, or, 11.2 arcsec/hr.
The recommended exposure time corresponds to 11.6 km per image.
The 1-sigma error in the time of the event is 3.5 seconds.
The 1-sigma cross-track error in the shadow position is 33.4 km.
The sky-plane scale is 3248.6 km/arcsec.
Diameter estimates:
47.2 km assuming a 5% albedo, aximum of 4.7 sec for a central chord
19.3 km assuming a 30% albedo, maximum of 1.9 sec for a central chord
Cross-track diameter of 47.2 km used for deployment plan.
Star training set for 4501_Eurypylos, (2025/04/09 13:33UT) Object RA Dec mag sep mel Regulus 10:09:42.9 +11:50:34 1.3 12.77 12 30Bet Sex 10:31:35.0 -00:46:03 4.8 1.74 11 PPM 178174 10:26:08.7 -00:31:52 7.9 0.37 12 PPM 178164 10:24:20.2 -00:29:03 10.0 0.17 12 4501_Eurypylos 10:24:48.8 -00:22:05 15.7 12 Positions are for equinox of date
Star training set for 4501_Eurypylos, (2025/04/09 13:33UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 12.77 12 30Bet Sex 10:30:17.4 -00:38:14 4.8 1.74 11 PPM 178174 10:24:51.1 -00:24:08 7.9 0.37 12 PPM 178164 10:23:02.6 -00:21:20 10.0 0.17 12 4501_Eurypylos 10:23:31.2 -00:14:23 15.7 12 Positions are for J2000