Occultation event with (5259) Epeigeus, event index number 3850
Regions able to see the event: Australia
Geocentric closest approach at 2026/07/15 11:15:27 UTC
J2000 position of star is 11:43:17.4 +16:37:07
Equinox of date position of star is 11:44:39.8 +16:28:16
Star is 43 degrees from the moon. Moon is 2% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=16.2
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 3.2 per integration for unocculted signal
Expected flux drop is 52% with SNR of 1.7 for the occulted depth (per occulted point)
Apparent velocity is 29.6 km/sec on the sky relative to the star, or, 26.0 arcsec/hr.
Position angle of asteroid motion is 126.9 degrees
The recommended exposure time corresponds to 17.8 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 13.2 km.
The sky-plane scale is 4098.1 km/arcsec.
Diameter estimates:
50.6 km assuming a 5% albedo, maximum of 1.7 sec for a central chord
20.6 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 44.7 km used for deployment plan.
Star training set for 5259_Epeigeus, (2026/07/15 11:15UT) Object RA Dec mag sep mel Regulus 10:09:47.0 +11:50:11 1.3 23.45 22 Denebola 11:50:24.7 +14:25:25 2.1 2.47 45 PPM 128581 11:50:36.9 +16:05:42 6.3 1.48 44 PPM 128574 11:50:23.9 +15:59:06 7.7 1.46 44 PPM 128471 11:43:05.9 +16:31:38 9.7 0.38 42 5259_Epeigeus 11:44:39.8 +16:28:16 16.2 43 Positions are for equinox of date
Star training set for 5259_Epeigeus, (2026/07/15 11:15UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 23.45 22 Denebola 11:49:02.7 +14:34:16 2.1 2.47 45 PPM 128581 11:49:14.9 +16:14:33 6.3 1.48 44 PPM 128574 11:49:01.8 +16:07:57 7.7 1.46 44 PPM 128471 11:41:43.5 +16:40:28 9.7 0.38 42 5259_Epeigeus 11:43:17.4 +16:37:07 16.2 43 Positions are for J2000