Occultation event with (5130) Ilioneus, event index number 4454
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/10/22 03:08:53 UTC
J2000 position of star is 02:56:22.5 +23:07:52
Equinox of date position of star is 02:57:55.6 +23:14:16
Star is 71 degrees from the moon. Moon is 82% illuminated.
Stellar brightness G=14.7, apparent brightess of occulting body is G=14.7
Use an exposure time of 0.75 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 49% with SNR of 4.8 for the occulted depth (per occulted point)
Apparent velocity is 15.8 km/sec on the sky relative to the star, or, 18.6 arcsec/hr.
Position angle of asteroid motion is 64.4 degrees
The recommended exposure time corresponds to 11.8 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 23.5 km.
The sky-plane scale is 3050.3 km/arcsec.
Diameter estimates:
65.8 km assuming a 5% albedo, maximum of 4.2 sec for a central chord
26.9 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 60.7 km used for deployment plan.
Star training set for 5130_Ilioneus, (2026/10/22 03:09UT) Object RA Dec mag sep mel Aldebaran 04:37:27.7 +16:33:40 0.8 24.29 92 Hamal 02:08:41.4 +23:35:17 2.0 11.30 60 48Eps Ari 03:00:45.0 +21:26:45 5.6 1.91 71 PPM 092136 03:02:09.6 +22:56:02 8.1 1.02 72 PPM 092088 02:57:46.3 +23:18:17 11.4 0.08 71 5130_Ilioneus 02:57:55.6 +23:14:16 14.7 71 Positions are for equinox of date
Star training set for 5130_Ilioneus, (2026/10/22 03:09UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 24.29 92 Hamal 02:07:10.8 +23:27:41 2.0 11.30 60 48Eps Ari 02:59:12.6 +21:20:25 5.6 1.91 71 PPM 092136 03:00:36.4 +22:49:45 8.1 1.02 72 PPM 092088 02:56:13.1 +23:11:52 11.4 0.08 71 5130_Ilioneus 02:56:22.5 +23:07:52 14.7 71 Positions are for J2000