Occultation event with (5511) Cloanthus, event index number 4453
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/10/22 01:52:40 UTC
J2000 position of star is 05:56:08.2 +11:06:16
Equinox of date position of star is 05:57:37.7 +11:06:23
Star is 112 degrees from the moon. Moon is 81% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=16.2
Use an exposure time of 1.55 seconds with the standard RECON-QHY system.
SNR of 7.4 per integration for unocculted signal
Expected flux drop is 58% with SNR of 4.3 for the occulted depth (per occulted point)
Apparent velocity is 6.3 km/sec on the sky relative to the star, or, 6.0 arcsec/hr.
Position angle of asteroid motion is 33.5 degrees
The recommended exposure time corresponds to 9.7 km per image.
The 1-sigma error in the time of the event is 3.9 seconds.
The 1-sigma cross-track error in the shadow position is 15.2 km.
The sky-plane scale is 3767.4 km/arcsec.
Diameter estimates:
50.3 km assuming a 5% albedo, maximum of 8.0 sec for a central chord
20.6 km assuming a 30% albedo, maximum of 3.3 sec for a central chord
Cross-track diameter of 39.8 km used for deployment plan.
Star training set for 5511_Cloanthus, (2026/10/22 01:53UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.4 +07:24:35 0.4 3.71 111 Bellatrix 05:26:34.2 +06:22:18 1.6 9.02 104 PPM 121631 05:58:19.4 +11:31:20 5.9 0.45 112 PPM 121605 05:57:31.7 +11:31:27 7.6 0.42 112 PPM 121619 05:58:01.3 +11:02:42 9.9 0.11 112 5511_Cloanthus 05:57:37.7 +11:06:23 16.2 112 Positions are for equinox of date
Star training set for 5511_Cloanthus, (2026/10/22 01:53UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 3.71 111 Bellatrix 05:25:07.8 +06:20:58 1.6 9.02 104 PPM 121631 05:56:49.6 +11:31:14 5.9 0.45 112 PPM 121605 05:56:02.0 +11:31:19 7.6 0.42 112 PPM 121619 05:56:31.9 +11:02:35 9.9 0.11 112 5511_Cloanthus 05:56:08.2 +11:06:16 16.2 112 Positions are for J2000