Occultation event with (1867) Deiphobus, event index number 4259
Regions able to see the event: Europe
Geocentric closest approach at 2026/09/18 04:04:31 UTC
J2000 position of star is 05:57:36.8 +35:41:30
Equinox of date position of star is 05:59:24.6 +35:41:34
Star is 166 degrees from the moon. Moon is 44% illuminated.
Stellar brightness G=14.8, apparent brightess of occulting body is G=14.1
Use an exposure time of 0.90 seconds with the standard RECON-QHY system.
SNR of 9.8 per integration for unocculted signal
Expected flux drop is 35% with SNR of 3.4 for the occulted depth (per occulted point)
Apparent velocity is 13.0 km/sec on the sky relative to the star, or, 12.1 arcsec/hr.
Position angle of asteroid motion is 86.9 degrees
The recommended exposure time corresponds to 11.7 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 34.2 km.
The sky-plane scale is 3856.2 km/arcsec.
Diameter estimates:
130.0 km assuming a 5% albedo, maximum of 10.0 sec for a central chord
53.1 km assuming a 30% albedo, maximum of 4.1 sec for a central chord
Cross-track diameter of 118.2 km used for deployment plan.
Star training set for 1867_Deiphobus, (2026/09/18 04:05UT) Object RA Dec mag sep mel Pollux 07:46:56.9 +27:57:34 1.1 24.02 145 34Bet Aur 06:01:29.4 +44:56:50 1.9 9.26 160 31Ups Aur 05:52:51.9 +37:18:38 6.3 2.08 166 PPM 071045 05:59:17.3 +35:46:41 8.4 0.09 166 1867_Deiphobus 05:59:24.6 +35:41:34 14.1 166 Positions are for equinox of date
Star training set for 1867_Deiphobus, (2026/09/18 04:05UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 24.02 145 34Bet Aur 05:59:31.6 +44:56:51 1.9 9.26 160 31Ups Aur 05:51:02.6 +37:18:19 6.3 2.08 166 PPM 071045 05:57:29.4 +35:46:37 8.4 0.09 166 1867_Deiphobus 05:57:36.8 +35:41:30 14.1 166 Positions are for J2000