Occultation event with (1867) Deiphobus, event index number 1249
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/08/24 06:03:14 UTC
J2000 position of star is 03:23:53.4 +42:47:32
Equinox of date position of star is 03:25:37.0 +42:52:54
Star is 102 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=14.0
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 4.5 per integration for unocculted signal
Expected flux drop is 12% with SNR of 0.5 for the occulted depth (per occulted point)
Apparent velocity is 13.1 km/sec on the sky relative to the star, or, 12.7 arcsec/hr.
Position angle of asteroid motion is 39.8 degrees
The recommended exposure time corresponds to 26.2 km per image.
The 1-sigma error in the time of the event is 1.9 seconds.
The 1-sigma cross-track error in the shadow position is 23.8 km.
The sky-plane scale is 3716.3 km/arcsec.
Diameter estimates:
130.0 km assuming a 5% albedo, aximum of 9.9 sec for a central chord
53.1 km assuming a 30% albedo, maximum of 4.1 sec for a central chord
Cross-track diameter of 118.2 km used for deployment plan.
Star training set for 1867_Deiphobus, (2025/08/24 06:03UT) Object RA Dec mag sep mel Aldebaran 04:37:23.7 +16:33:31 0.8 30.44 93 Algol 03:09:50.9 +41:03:09 2.1 3.45 106 PPM 046142 03:26:51.8 +41:20:47 6.4 1.55 102 PPM 046174 03:28:13.5 +42:21:51 8.1 0.71 102 PPM 046165 03:27:47.7 +42:58:10 9.6 0.41 102 PPM 046130 03:26:11.5 +43:14:18 11.3 0.37 102 1867_Deiphobus 03:25:37.0 +42:52:54 14.0 102 Positions are for equinox of date
Star training set for 1867_Deiphobus, (2025/08/24 06:03UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 30.44 93 Algol 03:08:10.1 +40:57:20 2.1 3.45 106 PPM 046142 03:25:09.4 +41:15:27 6.4 1.55 102 PPM 046174 03:26:30.1 +42:16:33 8.1 0.71 102 PPM 046165 03:26:03.8 +42:52:51 9.6 0.41 102 PPM 046130 03:24:27.5 +43:08:57 11.3 0.37 102 1867_Deiphobus 03:23:53.4 +42:47:32 14.0 102 Positions are for J2000