Occultation event with (1867) Deiphobus, event index number 1152
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/07/21 09:21:15 UTC
J2000 position of star is 03:06:33.9 +40:20:34
Equinox of date position of star is 03:08:13.7 +40:26:24
Star is 24 degrees from the moon. Moon is 15% illuminated.
Stellar brightness G=15.2, apparent brightess of occulting body is G=14.1
Use an exposure time of 1.20 seconds with the standard RECON-QHY system.
SNR of 8.1 per integration for unocculted signal
Expected flux drop is 27% with SNR of 2.2 for the occulted depth (per occulted point)
Apparent velocity is 25.9 km/sec on the sky relative to the star, or, 23.1 arcsec/hr.
The recommended exposure time corresponds to 31.1 km per image.
The 1-sigma error in the time of the event is 1.2 seconds.
The 1-sigma cross-track error in the shadow position is 15.7 km.
The sky-plane scale is 4047.0 km/arcsec.
Diameter estimates:
129.4 km assuming a 5% albedo, aximum of 5.0 sec for a central chord
52.8 km assuming a 30% albedo, maximum of 2.0 sec for a central chord
Cross-track diameter of 129.4 km used for deployment plan.
Star training set for 1867_Deiphobus, (2025/07/21 09:21UT) Object RA Dec mag sep mel Aldebaran 04:37:23.4 +16:33:31 0.8 30.70 11 Algol 03:09:50.5 +41:03:08 2.1 0.68 24 28Ome Per 03:12:56.9 +39:42:24 5.8 1.16 23 PPM 045859 03:09:18.0 +40:10:57 8.4 0.33 24 PPM 045857 03:08:59.3 +40:17:56 9.5 0.20 24 PPM 045836 03:07:35.5 +40:20:17 10.3 0.16 24 1867_Deiphobus 03:08:13.7 +40:26:24 14.1 24 Positions are for equinox of date
Star training set for 1867_Deiphobus, (2025/07/21 09:21UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 30.70 11 Algol 03:08:10.1 +40:57:20 2.1 0.68 24 28Ome Per 03:11:17.3 +39:36:41 5.8 1.16 23 PPM 045859 03:07:38.3 +40:05:08 8.4 0.33 24 PPM 045857 03:07:19.6 +40:12:07 9.5 0.20 24 PPM 045836 03:05:55.9 +40:14:26 10.3 0.16 24 1867_Deiphobus 03:06:33.9 +40:20:34 14.1 24 Positions are for J2000