Occultation event with (1867) Deiphobus, event index number 1165
Regions able to see the event: Europe
Geocentric closest approach at 2025/07/24 02:08:59 UTC
J2000 position of star is 03:08:24.9 +40:33:03
Equinox of date position of star is 03:10:05.0 +40:38:51
Star is 57 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=15.3, apparent brightess of occulting body is G=14.1
Use an exposure time of 1.25 seconds with the standard RECON-QHY system.
SNR of 7.3 per integration for unocculted signal
Expected flux drop is 25% with SNR of 1.8 for the occulted depth (per occulted point)
Apparent velocity is 25.0 km/sec on the sky relative to the star, or, 22.3 arcsec/hr.
The recommended exposure time corresponds to 31.2 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 19.8 km.
The sky-plane scale is 4022.5 km/arcsec.
Diameter estimates:
129.4 km assuming a 5% albedo, aximum of 5.2 sec for a central chord
52.8 km assuming a 30% albedo, maximum of 2.1 sec for a central chord
Cross-track diameter of 129.4 km used for deployment plan.
Star training set for 1867_Deiphobus, (2025/07/24 02:09UT) Object RA Dec mag sep mel Aldebaran 04:37:23.4 +16:33:31 0.8 30.60 44 Algol 03:09:50.5 +41:03:08 2.1 0.41 57 28Ome Per 03:12:57.0 +39:42:24 5.8 1.09 57 PPM 045859 03:09:18.0 +40:10:57 8.4 0.49 57 PPM 045877 03:10:45.8 +40:56:22 8.6 0.32 57 PPM 045873 03:10:35.7 +40:44:52 10.4 0.14 57 1867_Deiphobus 03:10:05.0 +40:38:51 14.1 57 Positions are for equinox of date
Star training set for 1867_Deiphobus, (2025/07/24 02:09UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 30.60 44 Algol 03:08:10.1 +40:57:20 2.1 0.41 57 28Ome Per 03:11:17.3 +39:36:41 5.8 1.09 57 PPM 045859 03:07:38.3 +40:05:08 8.4 0.49 57 PPM 045877 03:09:05.4 +40:50:36 8.6 0.32 57 PPM 045873 03:08:55.5 +40:39:06 10.4 0.14 57 1867_Deiphobus 03:08:24.9 +40:33:03 14.1 57 Positions are for J2000