Occultation event with (5436) Eumelos, event index number 1537
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/11/18 08:28:41 UTC
J2000 position of star is 11:45:07.6 -05:45:42
Equinox of date position of star is 11:46:27.0 -05:54:20
Star is 36 degrees from the moon. Moon is 3% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.45 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 55% with SNR of 1.7 for the occulted depth (per occulted point)
Apparent velocity is 29.6 km/sec on the sky relative to the star, or, 27.2 arcsec/hr.
Position angle of asteroid motion is 118.6 degrees
The recommended exposure time corresponds to 13.3 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 26.1 km.
The sky-plane scale is 3917.3 km/arcsec.
Diameter estimates:
48.8 km assuming a 5% albedo, aximum of 1.6 sec for a central chord
19.9 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 37.7 km used for deployment plan.
Star training set for 5436_Eumelos, (2025/11/18 08:29UT) Object RA Dec mag sep mel Spica 13:26:33.6 -11:17:44 1.0 25.31 12 4Gam Crv 12:17:08.5 -17:41:08 2.6 13.96 26 PPM 194769 11:45:14.5 -06:49:17 6.1 0.96 36 PPM 194761 11:44:44.6 -05:35:03 8.5 0.53 37 PPM 194790 11:46:22.0 -05:59:33 9.8 0.09 36 5436_Eumelos 11:46:27.0 -05:54:20 16.0 36 Positions are for equinox of date
Star training set for 5436_Eumelos, (2025/11/18 08:29UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 25.31 12 4Gam Crv 12:15:48.1 -17:32:30 2.6 13.96 26 PPM 194769 11:43:55.2 -06:40:39 6.1 0.96 36 PPM 194761 11:43:25.3 -05:26:26 8.5 0.53 37 PPM 194790 11:45:02.7 -05:50:55 9.8 0.09 36 5436_Eumelos 11:45:07.6 -05:45:42 16.0 36 Positions are for J2000