Occultation event with (5511) Cloanthus, event index number 3993
Regions able to see the event: Australia
Geocentric closest approach at 2026/08/12 20:27:30 UTC
J2000 position of star is 05:35:13.7 +13:08:03
Equinox of date position of star is 05:36:43.8 +13:08:59
Star is 59 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=14.7, apparent brightess of occulting body is G=16.5
Use an exposure time of 0.35 seconds with the standard RECON-QHY system.
SNR of 6.8 per integration for unocculted signal
Expected flux drop is 84% with SNR of 5.7 for the occulted depth (per occulted point)
Apparent velocity is 28.2 km/sec on the sky relative to the star, or, 22.6 arcsec/hr.
Position angle of asteroid motion is 96.3 degrees
The recommended exposure time corresponds to 9.9 km per image.
The 1-sigma error in the time of the event is 0.1 seconds.
The 1-sigma cross-track error in the shadow position is 28.4 km.
The sky-plane scale is 4493.2 km/arcsec.
Diameter estimates:
50.3 km assuming a 5% albedo, maximum of 1.8 sec for a central chord
20.6 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 39.8 km used for deployment plan.
Star training set for 5511_Cloanthus, (2026/08/12 20:27UT) Object RA Dec mag sep mel Betelgeuse 05:56:36.8 +07:24:35 0.4 7.54 55 Bellatrix 05:26:33.6 +06:22:18 1.6 7.23 62 35 Ori 05:35:25.1 +14:19:19 5.6 1.21 59 PPM 121142 05:36:50.7 +13:17:58 7.9 0.15 59 5511_Cloanthus 05:36:43.8 +13:08:59 16.5 58 Positions are for equinox of date
Star training set for 5511_Cloanthus, (2026/08/12 20:27UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 7.54 55 Bellatrix 05:25:07.8 +06:20:58 1.6 7.23 62 35 Ori 05:33:54.3 +14:18:20 5.6 1.21 59 PPM 121142 05:35:20.5 +13:17:02 7.9 0.15 59 5511_Cloanthus 05:35:13.7 +13:08:03 16.5 59 Positions are for J2000