Occultation event with (1867) Deiphobus, event index number 5131
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/12/09 05:13:44 UTC
J2000 position of star is 05:41:21.5 +35:00:44
Equinox of date position of star is 05:43:09.5 +35:01:26
Star is 170 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=13.3
Use an exposure time of 1.55 seconds with the standard RECON-QHY system.
SNR of 4.1 per integration for unocculted signal
Expected flux drop is 8% with SNR of 0.3 for the occulted depth (per occulted point)
Apparent velocity is 19.1 km/sec on the sky relative to the star, or, 21.6 arcsec/hr.
Position angle of asteroid motion is 74.4 degrees
The recommended exposure time corresponds to 29.5 km per image.
The 1-sigma error in the time of the event is 0.3 seconds.
The 1-sigma cross-track error in the shadow position is 37.4 km.
The sky-plane scale is 3181.8 km/arcsec.
Diameter estimates:
130.0 km assuming a 5% albedo, maximum of 6.8 sec for a central chord
53.1 km assuming a 30% albedo, maximum of 2.8 sec for a central chord
Cross-track diameter of 118.2 km used for deployment plan.
Star training set for 1867_Deiphobus, (2026/12/09 05:14UT) Object RA Dec mag sep mel Aldebaran 04:37:28.2 +16:33:40 0.8 23.58 166 Alnath 05:27:59.8 +28:37:39 1.6 7.16 176 PPM 070537 05:35:25.8 +34:44:32 6.1 1.61 171 PPM 070662 05:40:40.6 +35:05:29 8.3 0.51 170 PPM 070719 05:43:17.1 +34:49:27 9.8 0.20 170 1867_Deiphobus 05:43:09.5 +35:01:26 13.3 170 Positions are for equinox of date
Star training set for 1867_Deiphobus, (2026/12/09 05:14UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 23.58 166 Alnath 05:26:17.6 +28:36:22 1.6 7.16 176 PPM 070537 05:33:38.1 +34:43:32 6.1 1.61 171 PPM 070662 05:38:52.5 +35:04:41 8.3 0.51 170 PPM 070719 05:41:29.3 +34:48:45 9.8 0.20 170 1867_Deiphobus 05:41:21.5 +35:00:44 13.3 170 Positions are for J2000