Occultation event with (1867) Deiphobus, event index number 1391
Regions able to see the event: Europe
Geocentric closest approach at 2025/10/19 19:48:43 UTC
J2000 position of star is 03:15:12.8 +44:45:32
Equinox of date position of star is 03:16:57.9 +44:51:11
Star is 126 degrees from the moon. Moon is 3% illuminated.
Stellar brightness G=14.8, apparent brightess of occulting body is G=13.5
Use an exposure time of 1.10 seconds with the standard RECON-QHY system.
SNR of 9.8 per integration for unocculted signal
Expected flux drop is 24% with SNR of 2.4 for the occulted depth (per occulted point)
Apparent velocity is 13.7 km/sec on the sky relative to the star, or, 15.3 arcsec/hr.
Position angle of asteroid motion is 83.8 degrees
The recommended exposure time corresponds to 15.1 km per image.
The 1-sigma error in the time of the event is 0.2 seconds.
The 1-sigma cross-track error in the shadow position is 35.4 km.
The sky-plane scale is 3235.3 km/arcsec.
Diameter estimates:
130.0 km assuming a 5% albedo, aximum of 9.5 sec for a central chord
53.1 km assuming a 30% albedo, maximum of 3.9 sec for a central chord
Cross-track diameter of 118.2 km used for deployment plan.
Star training set for 1867_Deiphobus, (2025/10/19 19:49UT) Object RA Dec mag sep mel Aldebaran 04:37:24.3 +16:33:32 0.8 32.95 118 Algol 03:09:51.5 +41:03:11 2.1 4.02 129 30 Per 03:19:32.2 +44:07:04 5.3 0.87 126 PPM 046015 03:20:18.1 +44:48:43 7.2 0.59 125 PPM 045934 03:14:47.1 +44:44:10 9.9 0.40 126 1867_Deiphobus 03:16:57.9 +44:51:11 13.5 125 Positions are for equinox of date
Star training set for 1867_Deiphobus, (2025/10/19 19:49UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 32.95 118 Algol 03:08:10.1 +40:57:20 2.1 4.02 129 30 Per 03:17:47.4 +44:01:30 5.3 0.87 126 PPM 046015 03:18:32.6 +44:43:10 7.2 0.59 125 PPM 045934 03:13:02.2 +44:38:27 9.9 0.40 126 1867_Deiphobus 03:15:12.8 +44:45:32 13.5 126 Positions are for J2000