Occultation event with (1867) Deiphobus, event index number 3439
Regions able to see the event: Europe
Geocentric closest approach at 2026/03/15 18:00:45 UTC
J2000 position of star is 03:09:13.0 +34:50:51
Equinox of date position of star is 03:10:51.6 +34:56:46
Star is 101 degrees from the moon. Moon is 12% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=14.2
Use an exposure time of 1.00 seconds with the standard RECON-QHY system.
SNR of 4.3 per integration for unocculted signal
Expected flux drop is 18% with SNR of 0.8 for the occulted depth (per occulted point)
Apparent velocity is 29.0 km/sec on the sky relative to the star, or, 25.3 arcsec/hr.
Position angle of asteroid motion is 96.5 degrees
The recommended exposure time corresponds to 29.0 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 35.7 km.
The sky-plane scale is 4137.6 km/arcsec.
Diameter estimates:
130.0 km assuming a 5% albedo, maximum of 4.5 sec for a central chord
53.1 km assuming a 30% albedo, maximum of 1.8 sec for a central chord
Cross-track diameter of 118.2 km used for deployment plan.
Star training set for 1867_Deiphobus, (2026/03/15 18:01UT) Object RA Dec mag sep mel Aldebaran 04:37:25.6 +16:33:35 0.8 26.68 115 Algol 03:09:53.1 +41:03:17 2.1 6.11 102 PPM 068330 03:20:22.7 +34:19:00 5.9 2.06 102 PPM 068142 03:10:25.0 +35:33:28 8.4 0.62 101 PPM 068173 03:12:23.0 +35:05:59 9.7 0.35 101 PPM 068156 03:11:11.5 +34:52:38 10.7 0.10 101 1867_Deiphobus 03:10:51.6 +34:56:46 14.2 101 Positions are for equinox of date
Star training set for 1867_Deiphobus, (2026/03/15 18:01UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 26.68 115 Algol 03:08:10.1 +40:57:20 2.1 6.11 102 PPM 068330 03:18:43.9 +34:13:22 5.9 2.06 102 PPM 068142 03:08:46.0 +35:27:32 8.4 0.62 101 PPM 068173 03:10:44.2 +35:00:07 9.7 0.35 101 PPM 068156 03:09:33.0 +34:46:44 10.7 0.10 101 1867_Deiphobus 03:09:13.0 +34:50:51 14.2 101 Positions are for J2000