Occultation event with (4709) Ennomos, event index number 4149
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/09/01 09:32:20 UTC
J2000 position of star is 05:54:09.5 +21:03:25
Equinox of date position of star is 05:55:45.3 +21:03:37
Star is 58 degrees from the moon. Moon is 81% illuminated.
Stellar brightness G=16.7, apparent brightess of occulting body is G=14.4
Use an exposure time of 1.80 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 22.2 km/sec on the sky relative to the star, or, 19.8 arcsec/hr.
Position angle of asteroid motion is 106.7 degrees
The recommended exposure time corresponds to 40.0 km per image.
The 1-sigma error in the time of the event is 1.2 seconds.
The 1-sigma cross-track error in the shadow position is 31.3 km.
The sky-plane scale is 4030.3 km/arcsec.
Diameter estimates:
114.3 km assuming a 5% albedo, maximum of 5.1 sec for a central chord
46.7 km assuming a 30% albedo, maximum of 2.1 sec for a central chord
Cross-track diameter of 91.4 km used for deployment plan.
Star training set for 4709_Ennomos, (2026/09/01 09:32UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.0 +07:24:35 0.4 13.65 61 Alnath 05:27:58.8 +28:37:39 1.6 9.84 52 54Chi1Ori 05:55:57.8 +20:16:43 5.1 0.78 58 PPM 095075 05:56:50.0 +21:04:48 8.5 0.25 58 PPM 095037 05:55:11.3 +21:09:34 9.2 0.17 58 4709_Ennomos 05:55:45.3 +21:03:37 14.4 59 Positions are for equinox of date
Star training set for 4709_Ennomos, (2026/09/01 09:32UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 13.65 61 Alnath 05:26:17.6 +28:36:22 1.6 9.84 52 54Chi1Ori 05:54:22.6 +20:16:32 5.1 0.78 58 PPM 095075 05:55:14.3 +21:04:38 8.5 0.25 58 PPM 095037 05:53:35.5 +21:09:20 9.2 0.17 58 4709_Ennomos 05:54:09.5 +21:03:25 14.4 58 Positions are for J2000