Occultation event with (5511) Cloanthus, event index number 1326
Regions able to see the event: Australia
Geocentric closest approach at 2025/09/30 20:52:58 UTC
J2000 position of star is 04:03:42.0 +09:34:06
Equinox of date position of star is 04:05:06.3 +09:38:15
Star is 131 degrees from the moon. Moon is 59% illuminated.
Stellar brightness G=15.4, apparent brightess of occulting body is G=15.9
Use an exposure time of 1.20 seconds with the standard RECON-QHY system.
SNR of 8.8 per integration for unocculted signal
Expected flux drop is 62% with SNR of 5.4 for the occulted depth (per occulted point)
Apparent velocity is 8.2 km/sec on the sky relative to the star, or, 8.4 arcsec/hr.
Position angle of asteroid motion is 38.2 degrees
The recommended exposure time corresponds to 9.8 km per image.
The 1-sigma error in the time of the event is 3.0 seconds.
The 1-sigma cross-track error in the shadow position is 14.5 km.
The sky-plane scale is 3505.0 km/arcsec.
Diameter estimates:
50.3 km assuming a 5% albedo, aximum of 6.2 sec for a central chord
20.6 km assuming a 30% albedo, maximum of 2.5 sec for a central chord
Cross-track diameter of 39.8 km used for deployment plan.
Star training set for 5511_Cloanthus, (2025/09/30 20:53UT) Object RA Dec mag sep mel Aldebaran 04:37:24.1 +16:33:32 0.8 10.47 141 Menkar 03:03:37.7 +04:11:21 2.5 16.19 115 PPM 147134 04:03:10.6 +10:04:05 5.6 0.64 130 PPM 147153 04:04:23.7 +09:16:36 7.7 0.40 130 PPM 147173 04:05:25.5 +09:21:40 11.2 0.29 131 5511_Cloanthus 04:05:06.3 +09:38:15 15.9 131 Positions are for equinox of date
Star training set for 5511_Cloanthus, (2025/09/30 20:53UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 10.47 141 Menkar 03:02:16.8 +04:05:21 2.5 16.19 115 PPM 147134 04:01:46.1 +09:59:52 5.6 0.64 130 PPM 147153 04:02:59.6 +09:12:25 7.7 0.40 130 PPM 147173 04:04:01.3 +09:17:32 11.2 0.29 131 5511_Cloanthus 04:03:42.0 +09:34:06 15.9 131 Positions are for J2000