Occultation event with (1867) Deiphobus, event index number 4244
Regions able to see the event: Australia
Geocentric closest approach at 2026/09/15 19:25:11 UTC
J2000 position of star is 05:56:38.4 +35:40:55
Equinox of date position of star is 05:58:26.1 +35:41:00
Star is 140 degrees from the moon. Moon is 22% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=14.1
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 5.7 per integration for unocculted signal
Expected flux drop is 16% with SNR of 0.9 for the occulted depth (per occulted point)
Apparent velocity is 14.1 km/sec on the sky relative to the star, or, 13.0 arcsec/hr.
Position angle of asteroid motion is 87.1 degrees
The recommended exposure time corresponds to 28.1 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 34.5 km.
The sky-plane scale is 3882.4 km/arcsec.
Diameter estimates:
130.0 km assuming a 5% albedo, maximum of 9.2 sec for a central chord
53.1 km assuming a 30% albedo, maximum of 3.8 sec for a central chord
Cross-track diameter of 118.2 km used for deployment plan.
Star training set for 1867_Deiphobus, (2026/09/15 19:25UT) Object RA Dec mag sep mel Pollux 07:46:56.8 +27:57:34 1.1 24.22 116 34Bet Aur 06:01:29.3 +44:56:50 1.9 9.28 137 31Ups Aur 05:52:51.9 +37:18:38 6.3 1.97 141 PPM 071045 05:59:17.2 +35:46:41 8.4 0.20 140 PPM 071028 05:58:39.7 +35:44:06 9.2 0.07 140 1867_Deiphobus 05:58:26.1 +35:41:00 14.1 139 Positions are for equinox of date
Star training set for 1867_Deiphobus, (2026/09/15 19:25UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 24.22 116 34Bet Aur 05:59:31.6 +44:56:51 1.9 9.28 137 31Ups Aur 05:51:02.6 +37:18:19 6.3 1.97 141 PPM 071045 05:57:29.4 +35:46:37 8.4 0.20 140 PPM 071028 05:56:51.9 +35:44:01 9.2 0.07 140 1867_Deiphobus 05:56:38.4 +35:40:55 14.1 140 Positions are for J2000