Occultation event with (5436) Eumelos, event index number 3776
Regions able to see the event: Australia
Geocentric closest approach at 2026/06/01 09:59:54 UTC
J2000 position of star is 11:31:58.2 -05:00:28
Equinox of date position of star is 11:33:19.1 -05:09:14
Star is 86 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=12.9, apparent brightess of occulting body is G=15.8
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 11.5 per integration for unocculted signal
Expected flux drop is 93% with SNR of 10.7 for the occulted depth (per occulted point)
Apparent velocity is 6.8 km/sec on the sky relative to the star, or, 7.2 arcsec/hr.
Position angle of asteroid motion is 77.7 degrees
The recommended exposure time corresponds to 0.8 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 40.6 km.
The sky-plane scale is 3395.9 km/arcsec.
Diameter estimates:
48.8 km assuming a 5% albedo, maximum of 7.2 sec for a central chord
19.9 km assuming a 30% albedo, maximum of 2.9 sec for a central chord
Cross-track diameter of 37.7 km used for deployment plan.
Star training set for 5436_Eumelos, (2026/06/01 10:00UT) Object RA Dec mag sep mel Regulus 10:09:46.6 +11:50:13 1.3 26.84 113 4Gam Crv 12:17:10.1 -17:41:18 2.6 16.49 71 PPM 194612 11:36:19.8 -04:30:28 6.4 0.99 86 PPM 194564 11:33:51.6 -05:32:50 8.5 0.42 86 PPM 194563 11:33:49.8 -05:07:34 9.3 0.13 86 5436_Eumelos 11:33:19.1 -05:09:14 15.8 86 Positions are for equinox of date
Star training set for 5436_Eumelos, (2026/06/01 10:00UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 26.84 113 4Gam Crv 12:15:48.1 -17:32:30 2.6 16.49 71 PPM 194612 11:34:58.8 -04:21:42 6.4 0.99 86 PPM 194564 11:32:30.8 -05:24:04 8.5 0.42 86 PPM 194563 11:32:29.0 -04:58:48 9.3 0.13 86 5436_Eumelos 11:31:58.2 -05:00:28 15.8 86 Positions are for J2000