Occultation event with (2148) Epeios, event index number 744
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/03/01 22:36:19 UTC
J2000 position of star is 09:44:56.0 +07:57:40
Equinox of date position of star is 09:46:16.0 +07:50:40
Star is 138 degrees from the moon. Moon is 5% 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 34% with SNR of 7.7 per integration
Apparent velocity is 16.4 km/sec on the sky relative to the star, or, 19.0 arcsec/hr.
The recommended exposure time corresponds to 9.9 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 19.6 km.
The sky-plane scale is 3110.7 km/arcsec.
Diameter estimates:
40.9 km assuming a 5% albedo, aximum of 2.5 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, (2025/03/01 22:36UT) Object RA Dec mag sep mel Regulus 10:09:42.6 +11:50:36 1.3 7.02 142 PPM 156172 09:47:29.6 +06:35:29 5.8 1.29 138 PPM 156131 09:45:03.8 +07:50:10 8.1 0.30 137 PPM 156164 09:47:01.9 +07:53:04 9.6 0.19 138 2148_Epeios 09:46:16.0 +07:50:40 15.7 138 Positions are for equinox of date
Star training set for 2148_Epeios, (2025/03/01 22:36UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 7.02 142 PPM 156172 09:46:10.1 +06:42:30 5.8 1.29 138 PPM 156131 09:43:43.9 +07:57:09 8.1 0.30 137 PPM 156164 09:45:41.9 +08:00:05 9.6 0.19 138 2148_Epeios 09:44:56.0 +07:57:40 15.7 138 Positions are for J2000