Occultation event with (5511) Cloanthus, event index number 1586
Regions able to see the event: SMexico
Geocentric closest approach at 2025/11/25 07:56:53 UTC
J2000 position of star is 03:42:13.4 +07:10:13
Equinox of date position of star is 03:43:36.6 +07:15:05
Star is 115 degrees from the moon. Moon is 22% illuminated.
Stellar brightness G=14.4, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.45 seconds with the standard RECON-QHY system.
SNR of 10.0 per integration for unocculted signal
Expected flux drop is 73% with SNR of 7.3 for the occulted depth (per occulted point)
Apparent velocity is 17.6 km/sec on the sky relative to the star, or, 19.1 arcsec/hr.
Position angle of asteroid motion is 76.3 degrees
The recommended exposure time corresponds to 7.9 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 26.6 km.
The sky-plane scale is 3309.9 km/arcsec.
Diameter estimates:
50.3 km assuming a 5% albedo, aximum of 2.9 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, (2025/11/25 07:57UT) Object RA Dec mag sep mel Aldebaran 04:37:24.6 +16:33:33 0.8 16.10 130 Menkar 03:03:38.2 +04:11:23 2.5 10.40 104 29 Tau 03:47:03.2 +06:07:45 5.3 1.41 115 PPM 146835 03:43:44.1 +07:38:00 8.5 0.38 115 PPM 146823 03:42:53.9 +06:57:15 10.6 0.35 114 5511_Cloanthus 03:43:36.6 +07:15:05 15.5 115 Positions are for equinox of date
Star training set for 5511_Cloanthus, (2025/11/25 07:57UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 16.10 130 Menkar 03:02:16.8 +04:05:21 2.5 10.40 104 29 Tau 03:45:40.5 +06:03:00 5.3 1.41 115 PPM 146835 03:42:20.7 +07:33:08 8.5 0.38 115 PPM 146823 03:41:30.8 +06:52:21 10.6 0.35 114 5511_Cloanthus 03:42:13.4 +07:10:13 15.5 115 Positions are for J2000