Occultation event with (4501) Eurypylos, event index number 1094
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/06/24 21:31:06 UTC
J2000 position of star is 10:38:34.5 +00:28:51
Equinox of date position of star is 10:39:52.9 +00:20:52
Star is 76 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=16.3, apparent brightess of occulting body is G=16.4
Use an exposure time of 0.80 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 50% with SNR of 1.5 for the occulted depth (per occulted point)
Apparent velocity is 24.1 km/sec on the sky relative to the star, or, 21.4 arcsec/hr.
Position angle of asteroid motion is 345.6 degrees
The recommended exposure time corresponds to 19.3 km per image.
The 1-sigma error in the time of the event is 2.2 seconds.
The 1-sigma cross-track error in the shadow position is 24.0 km.
The sky-plane scale is 4051.7 km/arcsec.
Diameter estimates:
47.2 km assuming a 5% albedo, aximum of 2.0 sec for a central chord
19.3 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 47.2 km used for deployment plan.
Star training set for 4501_Eurypylos, (2025/06/24 21:31UT) Object RA Dec mag sep mel Regulus 10:09:43.6 +11:50:30 1.3 13.72 64 33 Sex 10:42:42.0 -01:52:34 6.3 2.33 77 PPM 178248 10:41:19.6 -00:16:50 8.4 0.72 76 PPM 157073 10:42:06.2 +00:22:35 9.2 0.56 76 PPM 157026 10:39:30.1 +00:26:09 10.4 0.13 76 4501_Eurypylos 10:39:52.9 +00:20:52 16.4 76 Positions are for equinox of date
Star training set for 4501_Eurypylos, (2025/06/24 21:31UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 13.72 64 33 Sex 10:41:24.0 -01:44:33 6.3 2.33 77 PPM 178248 10:40:01.3 -00:08:49 8.4 0.72 76 PPM 157073 10:40:47.7 +00:30:36 9.2 0.56 76 PPM 157026 10:38:11.6 +00:34:08 10.4 0.13 76 4501_Eurypylos 10:38:34.5 +00:28:51 16.4 76 Positions are for J2000