Occultation event with (4709) Ennomos, event index number 4172
Regions able to see the event: Europe
Geocentric closest approach at 2026/09/04 03:45:54 UTC
J2000 position of star is 05:55:37.3 +20:57:02
Equinox of date position of star is 05:57:12.9 +20:57:10
Star is 21 degrees from the moon. Moon is 52% illuminated.
Stellar brightness G=16.7, apparent brightess of occulting body is G=14.4
Use an exposure time of 1.75 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 11% with SNR of 0.3 for the occulted depth (per occulted point)
Apparent velocity is 21.1 km/sec on the sky relative to the star, or, 19.0 arcsec/hr.
Position angle of asteroid motion is 107.9 degrees
The recommended exposure time corresponds to 37.0 km per image.
The 1-sigma error in the time of the event is 1.3 seconds.
The 1-sigma cross-track error in the shadow position is 30.4 km.
The sky-plane scale is 4000.6 km/arcsec.
Diameter estimates:
114.3 km assuming a 5% albedo, maximum of 5.4 sec for a central chord
46.7 km assuming a 30% albedo, maximum of 2.2 sec for a central chord
Cross-track diameter of 91.4 km used for deployment plan.
Star training set for 4709_Ennomos, (2026/09/04 03:46UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.0 +07:24:35 0.4 13.54 29 Alnath 05:27:58.8 +28:37:39 1.6 10.14 13 54Chi1Ori 05:55:57.8 +20:16:43 5.1 0.74 21 PPM 095075 05:56:50.0 +21:04:48 8.5 0.16 21 4709_Ennomos 05:57:12.9 +20:57:10 14.4 21 Positions are for equinox of date
Star training set for 4709_Ennomos, (2026/09/04 03:46UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 13.54 29 Alnath 05:26:17.6 +28:36:22 1.6 10.14 13 54Chi1Ori 05:54:22.6 +20:16:32 5.1 0.74 21 PPM 095075 05:55:14.3 +21:04:38 8.5 0.16 21 4709_Ennomos 05:55:37.3 +20:57:02 14.4 21 Positions are for J2000