Occultation event with (1867) Deiphobus, event index number 1509
Regions able to see the event: Europe,SAmericaN
Geocentric closest approach at 2025/11/13 23:21:06 UTC
J2000 position of star is 02:58:54.3 +43:47:19
Equinox of date position of star is 03:00:37.3 +43:53:26
Star is 105 degrees from the moon. Moon is 33% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=13.4
Use an exposure time of 1.60 seconds with the standard RECON-QHY system.
SNR of 3.6 per integration for unocculted signal
Expected flux drop is 7% with SNR of 0.3 for the occulted depth (per occulted point)
Apparent velocity is 18.1 km/sec on the sky relative to the star, or, 20.7 arcsec/hr.
Position angle of asteroid motion is 61.6 degrees
The recommended exposure time corresponds to 29.0 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 30.9 km.
The sky-plane scale is 3160.4 km/arcsec.
Diameter estimates:
130.0 km assuming a 5% albedo, aximum of 7.2 sec for a central chord
53.1 km assuming a 30% albedo, maximum of 2.9 sec for a central chord
Cross-track diameter of 118.2 km used for deployment plan.
Star training set for 1867_Deiphobus, (2025/11/13 23:21UT) Object RA Dec mag sep mel Aldebaran 04:37:24.5 +16:33:33 0.8 34.14 93 Algol 03:09:51.8 +41:03:12 2.1 3.31 105 27Kap Per 03:11:15.2 +44:57:13 5.0 2.18 103 PPM 045743 03:01:53.8 +43:13:42 7.4 0.70 105 PPM 045732 03:01:07.5 +43:56:00 9.6 0.10 105 1867_Deiphobus 03:00:37.3 +43:53:26 13.4 105 Positions are for equinox of date
Star training set for 1867_Deiphobus, (2025/11/13 23:21UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 34.14 93 Algol 03:08:10.1 +40:57:20 2.1 3.31 105 27Kap Per 03:09:30.2 +44:51:23 5.0 2.18 103 PPM 045743 03:00:11.2 +43:07:37 7.4 0.70 105 PPM 045732 02:59:24.4 +43:49:54 9.6 0.10 105 1867_Deiphobus 02:58:54.3 +43:47:19 13.4 105 Positions are for J2000