Occultation event with (2148) Epeios, event index number 3574
Regions able to see the event: Europe
Geocentric closest approach at 2026/04/04 02:17:19 UTC
J2000 position of star is 11:48:56.4 +01:54:01
Equinox of date position of star is 11:50:17.2 +01:45:15
Star is 41 degrees from the moon. Moon is 96% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=15.8
Use an exposure time of 0.90 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 37% with SNR of 1.2 for the occulted depth (per occulted point)
Apparent velocity is 16.3 km/sec on the sky relative to the star, or, 18.2 arcsec/hr.
Position angle of asteroid motion is 120.1 degrees
The recommended exposure time corresponds to 14.6 km per image.
The 1-sigma error in the time of the event is 1.8 seconds.
The 1-sigma cross-track error in the shadow position is 29.4 km.
The sky-plane scale is 3220.8 km/arcsec.
Diameter estimates:
41.3 km assuming a 5% albedo, maximum of 2.5 sec for a central chord
16.9 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 38.0 km used for deployment plan.
Star training set for 2148_Epeios, (2026/04/04 02:17UT) Object RA Dec mag sep mel Regulus 10:09:46.1 +11:50:16 1.3 26.88 67 Denebola 11:50:23.9 +14:25:31 2.1 12.67 48 5Bet Vir 11:52:03.8 +01:37:00 3.6 0.46 40 PPM 158245 11:51:07.5 +02:05:08 8.0 0.39 41 PPM 158225 11:49:24.4 +01:39:12 11.3 0.24 41 2148_Epeios 11:50:17.2 +01:45:15 15.8 40 Positions are for equinox of date
Star training set for 2148_Epeios, (2026/04/04 02:17UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 26.88 67 Denebola 11:49:02.7 +14:34:16 2.1 12.67 48 5Bet Vir 11:50:43.0 +01:45:46 3.6 0.46 40 PPM 158245 11:49:46.7 +02:13:54 8.0 0.39 41 PPM 158225 11:48:03.6 +01:47:58 11.3 0.24 41 2148_Epeios 11:48:56.4 +01:54:01 15.8 41 Positions are for J2000