Occultation event with (5130) Ilioneus, event index number 997
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/05/24 09:21:44 UTC
J2000 position of star is 00:17:25.2 +15:37:54
Equinox of date position of star is 00:18:44.0 +15:46:22
Star is 18 degrees from the moon. Moon is 11% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.70 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 37% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 31.0 km/sec on the sky relative to the star, or, 27.2 arcsec/hr.
The recommended exposure time corresponds to 21.7 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 21.9 km.
The sky-plane scale is 4106.0 km/arcsec.
Diameter estimates:
65.8 km assuming a 5% albedo, aximum of 2.1 sec for a central chord
26.9 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 65.8 km used for deployment plan.
Star training set for 5130_Ilioneus, (2025/05/24 09:22UT) Object RA Dec mag sep mel Deneb 20:42:17.9 +45:22:20 1.3 53.86 69 Algenib 00:14:32.8 +15:19:28 2.8 1.10 19 42 Psc 00:23:44.5 +13:37:24 6.2 2.47 16 PPM 116284 00:17:53.7 +15:58:42 8.4 0.29 18 PPM 116317 00:19:26.0 +15:48:27 9.2 0.17 17 5130_Ilioneus 00:18:44.0 +15:46:22 15.6 17 Positions are for equinox of date
Star training set for 5130_Ilioneus, (2025/05/24 09:22UT) Object RA Dec mag sep mel Deneb 20:41:25.9 +45:16:49 1.3 53.86 69 Algenib 00:13:14.2 +15:11:00 2.8 1.10 19 42 Psc 00:22:25.6 +13:28:57 6.2 2.47 16 PPM 116284 00:16:34.8 +15:50:14 8.4 0.29 18 PPM 116317 00:18:07.1 +15:39:59 9.2 0.17 17 5130_Ilioneus 00:17:25.2 +15:37:54 15.6 18 Positions are for J2000