Occultation event with (5511) Cloanthus, event index number 5060
Regions able to see the event: Europe
Geocentric closest approach at 2026/12/05 21:58:22 UTC
J2000 position of star is 05:41:32.4 +09:58:31
Equinox of date position of star is 05:43:01.5 +09:59:12
Star is 131 degrees from the moon. Moon is 9% illuminated.
Stellar brightness G=16.0, apparent brightess of occulting body is G=15.7
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 3.2 per integration for unocculted signal
Expected flux drop is 43% with SNR of 1.4 for the occulted depth (per occulted point)
Apparent velocity is 17.9 km/sec on the sky relative to the star, or, 18.5 arcsec/hr.
Position angle of asteroid motion is 84.2 degrees
The recommended exposure time corresponds to 10.8 km per image.
The 1-sigma error in the time of the event is 0.2 seconds.
The 1-sigma cross-track error in the shadow position is 28.6 km.
The sky-plane scale is 3490.8 km/arcsec.
Diameter estimates:
50.3 km assuming a 5% albedo, maximum of 2.8 sec for a central chord
20.6 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 39.8 km used for deployment plan.
Star training set for 5511_Cloanthus, (2026/12/05 21:58UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.8 +07:24:35 0.4 4.24 127 Bellatrix 05:26:34.6 +06:22:18 1.6 5.44 133 40Phi2Ori 05:38:23.2 +09:18:11 5.2 1.33 131 PPM 121241 05:41:41.0 +10:15:54 8.0 0.43 131 PPM 149324 05:43:09.2 +09:38:14 9.1 0.35 130 PPM 149316 05:42:48.7 +09:57:36 10.2 0.06 131 5511_Cloanthus 05:43:01.5 +09:59:12 15.7 130 Positions are for equinox of date
Star training set for 5511_Cloanthus, (2026/12/05 21:58UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 4.24 127 Bellatrix 05:25:07.8 +06:20:58 1.6 5.44 133 40Phi2Ori 05:36:54.6 +09:17:19 5.2 1.33 131 PPM 121241 05:40:11.7 +10:15:09 8.0 0.43 131 PPM 149324 05:41:40.3 +09:37:32 9.1 0.35 130 PPM 149316 05:41:19.6 +09:56:54 10.2 0.06 131 5511_Cloanthus 05:41:32.4 +09:58:31 15.7 131 Positions are for J2000