Occultation event with (1867) Deiphobus, event index number 1345
Regions able to see the event: Europe
Geocentric closest approach at 2025/10/07 22:09:14 UTC
J2000 position of star is 03:21:08.9 +44:44:42
Equinox of date position of star is 03:22:54.5 +44:50:10
Star is 40 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=13.6
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 4.2 per integration for unocculted signal
Expected flux drop is 9% with SNR of 0.4 for the occulted depth (per occulted point)
Apparent velocity is 10.4 km/sec on the sky relative to the star, or, 11.3 arcsec/hr.
Position angle of asteroid motion is 99.8 degrees
The recommended exposure time corresponds to 20.9 km per image.
The 1-sigma error in the time of the event is 0.7 seconds.
The 1-sigma cross-track error in the shadow position is 34.4 km.
The sky-plane scale is 3309.5 km/arcsec.
Diameter estimates:
130.0 km assuming a 5% albedo, aximum of 12.5 sec for a central chord
53.1 km assuming a 30% albedo, maximum of 5.1 sec for a central chord
Cross-track diameter of 118.2 km used for deployment plan.
Star training set for 1867_Deiphobus, (2025/10/07 22:09UT) Object RA Dec mag sep mel Aldebaran 04:37:24.1 +16:33:32 0.8 32.32 45 Algol 03:09:51.4 +41:03:11 2.1 4.47 35 30 Per 03:19:32.0 +44:07:04 5.3 0.94 39 PPM 046096 03:24:43.0 +45:03:24 7.9 0.39 40 PPM 046052 03:22:26.9 +45:07:51 10.4 0.31 40 1867_Deiphobus 03:22:54.5 +44:50:10 13.6 40 Positions are for equinox of date
Star training set for 1867_Deiphobus, (2025/10/07 22:09UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 32.32 45 Algol 03:08:10.1 +40:57:20 2.1 4.47 35 30 Per 03:17:47.4 +44:01:30 5.3 0.94 39 PPM 046096 03:22:57.0 +44:57:59 7.9 0.39 40 PPM 046052 03:20:41.1 +45:02:22 10.4 0.31 40 1867_Deiphobus 03:21:08.9 +44:44:42 13.6 40 Positions are for J2000