Occultation event with (5130) Ilioneus, event index number 4648
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/11/11 22:13:52 UTC
J2000 position of star is 02:45:31.1 +21:50:00
Equinox of date position of star is 02:47:03.3 +21:56:43
Star is 147 degrees from the moon. Moon is 7% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=14.4
Use an exposure time of 0.95 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 16% with SNR of 0.5 for the occulted depth (per occulted point)
Apparent velocity is 17.7 km/sec on the sky relative to the star, or, 21.1 arcsec/hr.
Position angle of asteroid motion is 60.7 degrees
The recommended exposure time corresponds to 16.8 km per image.
The 1-sigma error in the time of the event is 0.8 seconds.
The 1-sigma cross-track error in the shadow position is 22.3 km.
The sky-plane scale is 3020.3 km/arcsec.
Diameter estimates:
65.8 km assuming a 5% albedo, maximum of 3.7 sec for a central chord
26.9 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 60.7 km used for deployment plan.
Star training set for 5130_Ilioneus, (2026/11/11 22:14UT) Object RA Dec mag sep mel Aldebaran 04:37:27.9 +16:33:40 0.8 26.57 166 Hamal 02:08:41.6 +23:35:18 2.0 8.99 139 32Nu Ari 02:40:20.9 +22:04:34 5.4 1.56 145 PPM 091945 02:46:20.2 +21:43:35 8.1 0.28 147 PPM 091954 02:47:12.7 +21:48:44 9.5 0.14 147 5130_Ilioneus 02:47:03.3 +21:56:43 14.4 147 Positions are for equinox of date
Star training set for 5130_Ilioneus, (2026/11/11 22:14UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 26.57 166 Hamal 02:07:10.8 +23:27:41 2.0 8.99 139 32Nu Ari 02:38:49.0 +21:57:41 5.4 1.56 145 PPM 091945 02:44:48.1 +21:36:51 8.1 0.28 147 PPM 091954 02:45:40.6 +21:42:02 9.5 0.14 147 5130_Ilioneus 02:45:31.1 +21:50:00 14.4 147 Positions are for J2000