Occultation event with (2148) Epeios, event index number 725
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/02/27 05:59:34 UTC
J2000 position of star is 09:46:10.0 +07:47:59
Equinox of date position of star is 09:47:29.9 +07:40:58
Star is 172 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=15.0, apparent brightess of occulting body is G=15.7
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
Expected flux drop is 35% with SNR of 7.7 per integration
Apparent velocity is 16.8 km/sec on the sky relative to the star, or, 19.5 arcsec/hr.
The recommended exposure time corresponds to 10.1 km per image.
The 1-sigma error in the time of the event is 2.8 seconds.
The 1-sigma cross-track error in the shadow position is 25.0 km.
The sky-plane scale is 3102.8 km/arcsec.
Diameter estimates:
40.9 km assuming a 5% albedo, aximum of 2.4 sec for a central chord
16.7 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 40.9 km used for deployment plan.
Star training set for 2148_Epeios, (2025/02/27 06:00UT) Object RA Dec mag sep mel Regulus 10:09:42.6 +11:50:36 1.3 6.87 177 PPM 156172 09:47:29.6 +06:35:29 5.8 1.09 171 PPM 156131 09:45:03.8 +07:50:11 8.1 0.62 172 PPM 156164 09:47:01.8 +07:53:04 9.6 0.23 172 2148_Epeios 09:47:29.9 +07:40:58 15.7 172 Positions are for equinox of date
Star training set for 2148_Epeios, (2025/02/27 06:00UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 6.87 177 PPM 156172 09:46:10.1 +06:42:30 5.8 1.09 171 PPM 156131 09:43:43.9 +07:57:09 8.1 0.62 172 PPM 156164 09:45:41.9 +08:00:05 9.6 0.23 172 2148_Epeios 09:46:10.0 +07:47:59 15.7 172 Positions are for J2000