Occultation event with (15440) Eioneus, event index number 4696
Regions able to see the event: Europe
Geocentric closest approach at 2026/11/15 06:49:14 UTC
J2000 position of star is 12:51:44.1 +18:15:58
Equinox of date position of star is 12:53:04.0 +18:07:14
Star is 113 degrees from the moon. Moon is 30% illuminated.
Stellar brightness G=14.4, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.40 seconds with the standard RECON-QHY system.
SNR of 9.3 per integration for unocculted signal
Expected flux drop is 74% with SNR of 6.9 for the occulted depth (per occulted point)
Apparent velocity is 34.0 km/sec on the sky relative to the star, or, 28.5 arcsec/hr.
Position angle of asteroid motion is 95.3 degrees
The recommended exposure time corresponds to 13.6 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 42.4 km.
The sky-plane scale is 4292.8 km/arcsec.
Diameter estimates:
72.4 km assuming a 5% albedo, maximum of 2.1 sec for a central chord
29.6 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 62.5 km used for deployment plan.
Star training set for 15440_Eioneus, (2026/11/15 06:49UT) Object RA Dec mag sep mel Arcturus 14:16:53.4 +19:02:40 0.0 19.87 95 Vindemiatrix 13:03:30.9 +10:48:55 2.8 7.73 109 36 Com 13:00:15.1 +17:15:54 4.8 1.91 112 PPM 129390 12:52:31.7 +19:00:57 7.4 0.90 114 PPM 129398 12:53:12.1 +17:46:10 9.2 0.35 113 15440_Eioneus 12:53:04.0 +18:07:14 15.5 113 Positions are for equinox of date
Star training set for 15440_Eioneus, (2026/11/15 06:49UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 19.87 95 Vindemiatrix 13:02:10.1 +10:57:33 2.8 7.73 109 36 Com 12:58:55.4 +17:24:35 4.8 1.91 112 PPM 129390 12:51:11.8 +19:09:41 7.4 0.90 114 PPM 129398 12:51:52.1 +17:54:55 9.2 0.35 113 15440_Eioneus 12:51:44.1 +18:15:58 15.5 113 Positions are for J2000