Occultation event with (1867) Deiphobus, event index number 4777
Regions able to see the event: Europe
Geocentric closest approach at 2026/11/19 23:52:38 UTC
J2000 position of star is 05:53:12.4 +35:33:27
Equinox of date position of star is 05:55:00.7 +35:33:41
Star is 91 degrees from the moon. Moon is 74% illuminated.
Stellar brightness G=13.6, apparent brightess of occulting body is G=13.5
Use an exposure time of 0.25 seconds with the standard RECON-QHY system.
SNR of 9.8 per integration for unocculted signal
Expected flux drop is 47% with SNR of 4.6 for the occulted depth (per occulted point)
Apparent velocity is 14.9 km/sec on the sky relative to the star, or, 16.4 arcsec/hr.
Position angle of asteroid motion is 80.2 degrees
The recommended exposure time corresponds to 3.7 km per image.
The 1-sigma error in the time of the event is 0.7 seconds.
The 1-sigma cross-track error in the shadow position is 37.2 km.
The sky-plane scale is 3255.9 km/arcsec.
Diameter estimates:
130.0 km assuming a 5% albedo, maximum of 8.8 sec for a central chord
53.1 km assuming a 30% albedo, maximum of 3.6 sec for a central chord
Cross-track diameter of 118.2 km used for deployment plan.
Star training set for 1867_Deiphobus, (2026/11/19 23:53UT) Object RA Dec mag sep mel Pollux 07:46:57.5 +27:57:32 1.1 24.88 116 Alnath 05:27:59.6 +28:37:39 1.6 8.98 86 31Ups Aur 05:52:52.6 +37:18:38 6.3 1.80 91 PPM 070971 05:55:25.4 +36:08:03 8.2 0.58 91 PPM 070988 05:56:11.7 +35:39:17 9.9 0.26 92 1867_Deiphobus 05:55:00.7 +35:33:41 13.5 92 Positions are for equinox of date
Star training set for 1867_Deiphobus, (2026/11/19 23:53UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 24.88 116 Alnath 05:26:17.6 +28:36:22 1.6 8.98 86 31Ups Aur 05:51:02.6 +37:18:19 6.3 1.80 91 PPM 070971 05:53:36.5 +36:07:50 8.2 0.58 91 PPM 070988 05:54:23.3 +35:39:06 9.9 0.26 92 1867_Deiphobus 05:53:12.4 +35:33:27 13.5 91 Positions are for J2000