Occultation event with (5130) Ilioneus, event index number 4463
Regions able to see the event: Australia,SMexico
Geocentric closest approach at 2026/10/23 12:02:26 UTC
J2000 position of star is 02:55:42.1 +23:03:23
Equinox of date position of star is 02:57:15.2 +23:09:49
Star is 53 degrees from the moon. Moon is 91% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=14.6
Use an exposure time of 0.90 seconds with the standard RECON-QHY system.
SNR of 4.1 per integration for unocculted signal
Expected flux drop is 24% with SNR of 1.0 for the occulted depth (per occulted point)
Apparent velocity is 16.1 km/sec on the sky relative to the star, or, 19.0 arcsec/hr.
Position angle of asteroid motion is 64.2 degrees
The recommended exposure time corresponds to 14.5 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 23.6 km.
The sky-plane scale is 3045.4 km/arcsec.
Diameter estimates:
65.8 km assuming a 5% albedo, maximum of 4.1 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, (2026/10/23 12:02UT) Object RA Dec mag sep mel Aldebaran 04:37:27.7 +16:33:40 0.8 24.43 75 Hamal 02:08:41.5 +23:35:17 2.0 11.15 42 48Eps Ari 03:00:45.0 +21:26:45 5.6 1.90 53 PPM 092136 03:02:09.6 +22:56:02 8.1 1.15 54 PPM 092075 02:57:03.5 +23:02:28 10.5 0.13 52 5130_Ilioneus 02:57:15.2 +23:09:49 14.6 53 Positions are for equinox of date
Star training set for 5130_Ilioneus, (2026/10/23 12:02UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 24.43 75 Hamal 02:07:10.8 +23:27:41 2.0 11.15 42 48Eps Ari 02:59:12.6 +21:20:25 5.6 1.90 53 PPM 092136 03:00:36.4 +22:49:45 8.1 1.15 54 PPM 092075 02:55:30.4 +22:56:02 10.5 0.13 52 5130_Ilioneus 02:55:42.1 +23:03:23 14.6 53 Positions are for J2000