Occultation event with (5436) Eumelos, event index number 757
Regions able to see the event: Australia,NZ
Geocentric closest approach at 2025/03/05 12:44:59 UTC
J2000 position of star is 09:17:26.5 +06:41:11
Equinox of date position of star is 09:18:46.4 +06:34:47
Star is 80 degrees from the moon. Moon is 37% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=15.1
Use an exposure time of 1.10 seconds with the standard RECON-QHY system.
Expected flux drop is 77% with SNR of 3.1 per integration
Apparent velocity is 13.4 km/sec on the sky relative to the star, or, 17.0 arcsec/hr.
The recommended exposure time corresponds to 14.8 km per image.
The 1-sigma error in the time of the event is 3.7 seconds.
The 1-sigma cross-track error in the shadow position is 22.7 km.
The sky-plane scale is 2849.8 km/arcsec.
Diameter estimates:
48.3 km assuming a 5% albedo, aximum of 3.6 sec for a central chord
19.7 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 48.3 km used for deployment plan.
Star training set for 5436_Eumelos, (2025/03/05 12:45UT) Object RA Dec mag sep mel Regulus 10:09:42.6 +11:50:35 1.3 13.62 90 PPM 155539 09:13:31.7 +03:45:45 6.0 3.11 80 PPM 155672 09:19:40.9 +06:57:59 8.4 0.45 80 PPM 155619 09:17:16.2 +06:26:05 8.6 0.40 80 PPM 155644 09:18:34.5 +06:40:15 10.7 0.10 80 5436_Eumelos 09:18:46.4 +06:34:47 15.1 81 Positions are for equinox of date
Star training set for 5436_Eumelos, (2025/03/05 12:45UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 13.62 90 PPM 155539 09:12:12.8 +03:52:01 6.0 3.11 80 PPM 155672 09:18:20.8 +07:04:24 8.4 0.45 80 PPM 155619 09:15:56.3 +06:32:27 8.6 0.40 80 PPM 155644 09:17:14.5 +06:46:39 10.7 0.10 80 5436_Eumelos 09:17:26.5 +06:41:11 15.1 80 Positions are for J2000