Occultation event with (4501) Eurypylos, event index number 1635
Regions able to see the event: Australia
Geocentric closest approach at 2025/12/03 18:31:46 UTC
J2000 position of star is 12:38:48.4 -11:23:10
Equinox of date position of star is 12:40:09.3 -11:31:42
Star is 139 degrees from the moon. Moon is 98% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=16.4
Use an exposure time of 0.45 seconds with the standard RECON-QHY system.
SNR of 3.3 per integration for unocculted signal
Expected flux drop is 64% with SNR of 2.1 for the occulted depth (per occulted point)
Apparent velocity is 28.2 km/sec on the sky relative to the star, or, 24.1 arcsec/hr.
Position angle of asteroid motion is 117.0 degrees
The recommended exposure time corresponds to 12.7 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 27.8 km.
The sky-plane scale is 4208.1 km/arcsec.
Diameter estimates:
47.2 km assuming a 5% albedo, aximum of 1.7 sec for a central chord
19.3 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 45.5 km used for deployment plan.
Star training set for 4501_Eurypylos, (2025/12/03 18:32UT) Object RA Dec mag sep mel Spica 13:26:33.8 -11:17:45 1.0 11.37 149 4Gam Crv 12:17:08.6 -17:41:09 2.6 8.30 136 PPM 226198 12:42:36.8 -13:09:21 6.0 1.73 140 PPM 226121 12:39:38.2 -12:31:39 8.0 1.01 139 PPM 226119 12:39:33.2 -11:29:38 9.3 0.15 139 4501_Eurypylos 12:40:09.3 -11:31:42 16.4 139 Positions are for equinox of date
Star training set for 4501_Eurypylos, (2025/12/03 18:32UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 11.37 149 4Gam Crv 12:15:48.1 -17:32:30 2.6 8.30 136 PPM 226198 12:41:15.6 -13:00:51 6.0 1.73 140 PPM 226121 12:38:17.2 -12:23:07 8.0 1.01 139 PPM 226119 12:38:12.3 -11:21:06 9.3 0.15 139 4501_Eurypylos 12:38:48.4 -11:23:10 16.4 139 Positions are for J2000