Occultation event with (4501) Eurypylos, event index number 696
Regions able to see the event: UAE
Geocentric closest approach at 2025/02/22 18:04:24 UTC
J2000 position of star is 10:42:09.1 -02:41:49
Equinox of date position of star is 10:43:25.9 -02:49:45
Star is 103 degrees from the moon. Moon is 31% illuminated.
Stellar brightness G=13.9, apparent brightess of occulting body is G=15.4
Use an exposure time of 0.25 seconds with the standard RECON-QHY system.
Expected flux drop is 20% with SNR of 9.6 per integration
Apparent velocity is 16.7 km/sec on the sky relative to the star, or, 19.4 arcsec/hr.
The recommended exposure time corresponds to 4.2 km per image.
The 1-sigma error in the time of the event is 2.6 seconds.
The 1-sigma cross-track error in the shadow position is 24.3 km.
The sky-plane scale is 3099.3 km/arcsec.
Diameter estimates:
47.0 km assuming a 5% albedo, aximum of 2.8 sec for a central chord
19.2 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 47.0 km used for deployment plan.
Star training set for 4501_Eurypylos, (2025/02/22 18:04UT) Object RA Dec mag sep mel Regulus 10:09:42.5 +11:50:36 1.3 16.90 117 33 Sex 10:42:40.9 -01:52:28 6.3 0.97 104 PPM 178265 10:44:05.4 -02:19:04 7.5 0.54 103 PPM 193724 10:44:52.3 -03:04:48 9.5 0.44 103 PPM 178264 10:43:49.6 -02:39:15 10.2 0.20 103 4501_Eurypylos 10:43:25.9 -02:49:45 15.4 103 Positions are for equinox of date
Star training set for 4501_Eurypylos, (2025/02/22 18:04UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 16.90 117 33 Sex 10:41:24.0 -01:44:33 6.3 0.97 104 PPM 178265 10:42:48.5 -02:11:08 7.5 0.54 103 PPM 193724 10:43:35.5 -02:56:51 9.5 0.44 103 PPM 178264 10:42:32.8 -02:31:20 10.2 0.20 103 4501_Eurypylos 10:42:09.1 -02:41:49 15.4 103 Positions are for J2000