Occultation event with (1867) Deiphobus, event index number 5108
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/12/08 05:22:04 UTC
J2000 position of star is 05:42:01.8 +35:03:01
Equinox of date position of star is 05:43:49.8 +35:03:42
Star is 160 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=16.3, apparent brightess of occulting body is G=13.3
Use an exposure time of 1.70 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 6% with SNR of 0.2 for the occulted depth (per occulted point)
Apparent velocity is 18.9 km/sec on the sky relative to the star, or, 21.4 arcsec/hr.
Position angle of asteroid motion is 74.7 degrees
The recommended exposure time corresponds to 32.2 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 3183.7 km/arcsec.
Diameter estimates:
130.0 km assuming a 5% albedo, maximum of 6.9 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, (2026/12/08 05:22UT) Object RA Dec mag sep mel Aldebaran 04:37:28.2 +16:33:40 0.8 23.70 169 Alnath 05:27:59.8 +28:37:39 1.6 7.26 165 PPM 070537 05:35:25.8 +34:44:32 6.1 1.75 162 PPM 070730 05:43:45.2 +35:38:33 7.1 0.58 160 PPM 070745 05:44:27.3 +35:11:47 9.6 0.19 160 1867_Deiphobus 05:43:49.8 +35:03:42 13.3 160 Positions are for equinox of date
Star training set for 1867_Deiphobus, (2026/12/08 05:22UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 23.70 169 Alnath 05:26:17.6 +28:36:22 1.6 7.26 165 PPM 070537 05:33:38.1 +34:43:32 6.1 1.75 162 PPM 070730 05:41:56.6 +35:37:53 7.1 0.58 160 PPM 070745 05:42:39.2 +35:11:08 9.6 0.19 160 1867_Deiphobus 05:42:01.8 +35:03:01 13.3 160 Positions are for J2000