Occultation event with (1867) Deiphobus, event index number 4051
Regions able to see the event: Europe
Geocentric closest approach at 2026/08/20 01:28:53 UTC
J2000 position of star is 05:41:05.8 +35:33:42
Equinox of date position of star is 05:42:53.1 +35:34:24
Star is 150 degrees from the moon. Moon is 50% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=14.2
Use an exposure time of 1.15 seconds with the standard RECON-QHY system.
SNR of 8.8 per integration for unocculted signal
Expected flux drop is 31% with SNR of 2.7 for the occulted depth (per occulted point)
Apparent velocity is 25.3 km/sec on the sky relative to the star, or, 21.9 arcsec/hr.
Position angle of asteroid motion is 88.2 degrees
The recommended exposure time corresponds to 29.1 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 34.8 km.
The sky-plane scale is 4162.1 km/arcsec.
Diameter estimates:
130.0 km assuming a 5% albedo, maximum of 5.1 sec for a central chord
53.1 km assuming a 30% albedo, maximum of 2.1 sec for a central chord
Cross-track diameter of 118.2 km used for deployment plan.
Star training set for 1867_Deiphobus, (2026/08/20 01:29UT) Object RA Dec mag sep mel Aldebaran 04:37:27.1 +16:33:38 0.8 23.95 163 Alnath 05:27:58.7 +28:37:39 1.6 7.63 154 PPM 070537 05:35:24.6 +34:44:31 6.1 1.74 152 PPM 070730 05:43:44.0 +35:38:33 7.1 0.19 150 PPM 070710 05:42:52.7 +35:24:04 10.2 0.17 150 1867_Deiphobus 05:42:53.1 +35:34:24 14.2 150 Positions are for equinox of date
Star training set for 1867_Deiphobus, (2026/08/20 01:29UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 23.95 163 Alnath 05:26:17.6 +28:36:22 1.6 7.63 154 PPM 070537 05:33:38.1 +34:43:32 6.1 1.74 152 PPM 070730 05:41:56.6 +35:37:53 7.1 0.19 150 PPM 070710 05:41:05.6 +35:23:22 10.2 0.17 150 1867_Deiphobus 05:41:05.8 +35:33:42 14.2 150 Positions are for J2000