Occultation event with (5130) Ilioneus, event index number 1621
Regions able to see the event: Europe
Geocentric closest approach at 2025/12/01 17:04:25 UTC
J2000 position of star is 00:07:08.6 +14:32:08
Equinox of date position of star is 00:08:28.6 +14:40:47
Star is 19 degrees from the moon. Moon is 85% illuminated.
Stellar brightness G=14.2, apparent brightess of occulting body is G=15.1
Use an exposure time of 0.35 seconds with the standard RECON-QHY system.
SNR of 9.8 per integration for unocculted signal
Expected flux drop is 71% with SNR of 7.0 for the occulted depth (per occulted point)
Apparent velocity is 8.0 km/sec on the sky relative to the star, or, 8.6 arcsec/hr.
Position angle of asteroid motion is 164.0 degrees
The recommended exposure time corresponds to 2.8 km per image.
The 1-sigma error in the time of the event is 2.5 seconds.
The 1-sigma cross-track error in the shadow position is 12.1 km.
The sky-plane scale is 3339.7 km/arcsec.
Diameter estimates:
65.8 km assuming a 5% albedo, maximum of 8.3 sec for a central chord
26.9 km assuming a 30% albedo, maximum of 3.4 sec for a central chord
Cross-track diameter of 60.7 km used for deployment plan.
Star training set for 5130_Ilioneus, (2025/12/01 17:04UT) Object RA Dec mag sep mel Deneb 20:42:19.0 +45:22:26 1.3 52.91 68 Algenib 00:14:34.4 +15:19:39 2.8 1.61 17 86 Peg 00:07:02.0 +13:32:26 6.4 1.19 19 PPM 116168 00:10:05.9 +14:17:08 8.0 0.56 18 PPM 116147 00:08:45.9 +14:48:52 8.7 0.15 19 5130_Ilioneus 00:08:28.6 +14:40:47 15.1 18 Positions are for equinox of date
Star training set for 5130_Ilioneus, (2025/12/01 17:04UT) Object RA Dec mag sep mel Deneb 20:41:25.9 +45:16:49 1.3 52.91 68 Algenib 00:13:14.2 +15:11:00 2.8 1.61 17 86 Peg 00:05:42.0 +13:23:47 6.4 1.19 19 PPM 116168 00:08:45.9 +14:08:29 8.0 0.56 18 PPM 116147 00:07:25.9 +14:40:13 8.7 0.15 19 5130_Ilioneus 00:07:08.6 +14:32:08 15.1 19 Positions are for J2000