Occultation event with (1867) Deiphobus, event index number 1181
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/08/01 08:32:48 UTC
J2000 position of star is 03:13:37.3 +41:10:44
Equinox of date position of star is 03:15:18.4 +41:16:23
Star is 153 degrees from the moon. Moon is 48% illuminated.
Stellar brightness G=10.0, apparent brightess of occulting body is G=14.1
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 56.5 per integration for unocculted signal
Expected flux drop is 98% with SNR of 55.2 for the occulted depth (per occulted point)
Apparent velocity is 21.9 km/sec on the sky relative to the star, or, 20.0 arcsec/hr.
The recommended exposure time corresponds to 2.6 km per image.
The 1-sigma error in the time of the event is 1.4 seconds.
The 1-sigma cross-track error in the shadow position is 16.3 km.
The sky-plane scale is 3944.7 km/arcsec.
Diameter estimates:
129.4 km assuming a 5% albedo, aximum of 5.9 sec for a central chord
52.8 km assuming a 30% albedo, maximum of 2.4 sec for a central chord
Cross-track diameter of 129.4 km used for deployment plan.
Star training set for 1867_Deiphobus, (2025/08/01 08:33UT) Object RA Dec mag sep mel Aldebaran 04:37:23.5 +16:33:31 0.8 30.38 146 Algol 03:09:50.6 +41:03:08 2.1 1.05 154 PPM 045917 03:13:51.5 +42:28:14 5.9 1.23 152 PPM 045985 03:17:50.4 +41:57:11 8.5 0.83 153 PPM 045942 03:15:18.4 +41:16:23 10.0 0.00 153 1867_Deiphobus 03:15:18.4 +41:16:23 14.1 153 Positions are for equinox of date
Star training set for 1867_Deiphobus, (2025/08/01 08:33UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 30.38 146 Algol 03:08:10.1 +40:57:20 2.1 1.05 154 PPM 045917 03:12:09.5 +42:22:33 5.9 1.23 152 PPM 045985 03:16:08.5 +41:51:37 8.5 0.83 153 PPM 045942 03:13:37.3 +41:10:44 10.0 0.00 153 1867_Deiphobus 03:13:37.3 +41:10:44 14.1 153 Positions are for J2000