Occultation event with (15440) Eioneus, event index number 700
Regions able to see the event: NZ
Geocentric closest approach at 2025/02/23 12:06:44 UTC
J2000 position of star is 08:20:58.5 +24:18:25
Equinox of date position of star is 08:22:28.2 +24:13:33
Star is 155 degrees from the moon. Moon is 24% illuminated.
Stellar brightness G=14.4, apparent brightess of occulting body is G=14.7
Use an exposure time of 0.45 seconds with the standard RECON-QHY system.
Expected flux drop is 41% with SNR of 9.6 per integration
Apparent velocity is 15.0 km/sec on the sky relative to the star, or, 16.9 arcsec/hr.
The recommended exposure time corresponds to 6.7 km per image.
The 1-sigma error in the time of the event is 3.0 seconds.
The 1-sigma cross-track error in the shadow position is 24.9 km.
The sky-plane scale is 3202.6 km/arcsec.
Diameter estimates:
71.4 km assuming a 5% albedo, aximum of 4.8 sec for a central chord
29.2 km assuming a 30% albedo, maximum of 1.9 sec for a central chord
Cross-track diameter of 71.4 km used for deployment plan.
Star training set for 15440_Eioneus, (2025/02/23 12:07UT) Object RA Dec mag sep mel Pollux 07:46:51.1 +27:57:48 1.1 8.82 164 19Lam Cnc 08:22:01.6 +23:56:29 5.9 0.30 155 PPM 098584 08:20:38.8 +24:05:40 8.1 0.44 156 19Lam Cnc 08:22:01.6 +23:56:29 5.9 0.30 155 PPM 098629 08:23:09.8 +24:08:57 10.5 0.18 155 15440_Eioneus 08:22:28.2 +24:13:33 14.7 155 Positions are for equinox of date
Star training set for 15440_Eioneus, (2025/02/23 12:07UT) Object RA Dec mag sep mel Pollux 07:45:17.8 +28:01:33 1.1 8.82 164 19Lam Cnc 08:20:32.1 +24:01:20 5.9 0.30 155 PPM 098584 08:19:09.2 +24:10:29 8.1 0.44 156 19Lam Cnc 08:20:32.1 +24:01:20 5.9 0.30 155 PPM 098629 08:21:40.2 +24:13:50 10.5 0.18 155 15440_Eioneus 08:20:58.5 +24:18:25 14.7 155 Positions are for J2000