Occultation event with (1867) Deiphobus, event index number 4157
Regions able to see the event: US
Geocentric closest approach at 2026/09/02 12:36:35 UTC
J2000 position of star is 05:49:53.2 +35:37:23
Equinox of date position of star is 05:51:40.7 +35:37:44
Star is 42 degrees from the moon. Moon is 70% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=14.2
Use an exposure time of 1.65 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 10% with SNR of 0.3 for the occulted depth (per occulted point)
Apparent velocity is 19.9 km/sec on the sky relative to the star, or, 17.8 arcsec/hr.
Position angle of asteroid motion is 87.9 degrees
The recommended exposure time corresponds to 32.9 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 34.0 km.
The sky-plane scale is 4026.2 km/arcsec.
Diameter estimates:
130.0 km assuming a 5% albedo, maximum of 6.5 sec for a central chord
53.1 km assuming a 30% albedo, maximum of 2.7 sec for a central chord
Cross-track diameter of 118.2 km used for deployment plan.
Star training set for 1867_Deiphobus, (2026/09/02 12:37UT) Object RA Dec mag sep mel Aldebaran 04:37:27.3 +16:33:39 0.8 25.23 26 Alnath 05:27:58.8 +28:37:39 1.6 8.61 36 31Ups Aur 05:52:51.7 +37:18:38 6.3 1.70 42 PPM 070971 05:55:24.6 +36:08:03 8.2 0.91 42 PPM 070898 05:51:36.0 +35:29:01 10.0 0.15 41 1867_Deiphobus 05:51:40.7 +35:37:44 14.2 42 Positions are for equinox of date
Star training set for 1867_Deiphobus, (2026/09/02 12:37UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 25.23 26 Alnath 05:26:17.6 +28:36:22 1.6 8.61 36 31Ups Aur 05:51:02.6 +37:18:19 6.3 1.70 42 PPM 070971 05:53:36.5 +36:07:50 8.2 0.91 42 PPM 070898 05:49:48.6 +35:28:39 10.0 0.15 41 1867_Deiphobus 05:49:53.2 +35:37:23 14.2 42 Positions are for J2000