Occultation event with (5511) Cloanthus, event index number 1499
Regions able to see the event: Australia
Geocentric closest approach at 2025/11/12 18:43:31 UTC
J2000 position of star is 03:48:32.3 +07:36:48
Equinox of date position of star is 03:49:55.7 +07:41:28
Star is 91 degrees from the moon. Moon is 44% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=15.4
Use an exposure time of 0.75 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 33% with SNR of 1.0 for the occulted depth (per occulted point)
Apparent velocity is 17.8 km/sec on the sky relative to the star, or, 19.4 arcsec/hr.
Position angle of asteroid motion is 72.1 degrees
The recommended exposure time corresponds to 13.3 km per image.
The 1-sigma error in the time of the event is 0.7 seconds.
The 1-sigma cross-track error in the shadow position is 25.5 km.
The sky-plane scale is 3298.9 km/arcsec.
Diameter estimates:
50.3 km assuming a 5% albedo, aximum of 2.8 sec for a central chord
20.6 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 39.8 km used for deployment plan.
Star training set for 5511_Cloanthus, (2025/11/12 18:44UT) Object RA Dec mag sep mel Aldebaran 04:37:24.5 +16:33:33 0.8 14.59 78 Menkar 03:03:38.1 +04:11:23 2.5 12.03 103 31 Tau 03:53:23.2 +06:36:38 5.7 1.38 90 PPM 146888 03:47:07.2 +07:16:06 7.2 0.81 92 PPM 146939 03:50:38.1 +07:27:28 9.0 0.29 91 PPM 146940 03:50:40.8 +07:44:28 11.0 0.19 91 5511_Cloanthus 03:49:55.7 +07:41:28 15.4 91 Positions are for equinox of date
Star training set for 5511_Cloanthus, (2025/11/12 18:44UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 14.59 78 Menkar 03:02:16.8 +04:05:21 2.5 12.03 103 31 Tau 03:52:00.2 +06:32:05 5.7 1.38 90 PPM 146888 03:45:44.0 +07:11:20 7.2 0.81 92 PPM 146939 03:49:14.8 +07:22:49 9.0 0.29 91 PPM 146940 03:49:17.3 +07:39:50 11.0 0.19 91 5511_Cloanthus 03:48:32.3 +07:36:48 15.4 91 Positions are for J2000