Occultation event with (4709) Ennomos, event index number 4268
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/09/19 05:01:11 UTC
J2000 position of star is 06:02:13.5 +20:19:29
Equinox of date position of star is 06:03:48.9 +20:19:22
Star is 172 degrees from the moon. Moon is 53% illuminated.
Stellar brightness G=15.6, apparent brightess of occulting body is G=14.3
Use an exposure time of 1.50 seconds with the standard RECON-QHY system.
SNR of 6.6 per integration for unocculted signal
Expected flux drop is 23% with SNR of 1.5 for the occulted depth (per occulted point)
Apparent velocity is 15.1 km/sec on the sky relative to the star, or, 14.2 arcsec/hr.
Position angle of asteroid motion is 117.8 degrees
The recommended exposure time corresponds to 22.6 km per image.
The 1-sigma error in the time of the event is 2.2 seconds.
The 1-sigma cross-track error in the shadow position is 24.6 km.
The sky-plane scale is 3833.1 km/arcsec.
Diameter estimates:
114.3 km assuming a 5% albedo, maximum of 7.6 sec for a central chord
46.7 km assuming a 30% albedo, maximum of 3.1 sec for a central chord
Cross-track diameter of 91.4 km used for deployment plan.
Star training set for 4709_Ennomos, (2026/09/19 05:01UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.1 +07:24:35 0.4 13.03 159 Alhena 06:39:15.3 +16:22:27 1.9 9.29 166 62Chi2Ori 06:05:30.4 +20:08:07 4.5 0.44 172 PPM 095290 06:04:42.5 +20:35:01 7.7 0.33 173 PPM 095234 06:02:50.7 +20:25:08 9.3 0.25 172 4709_Ennomos 06:03:48.9 +20:19:22 14.3 172 Positions are for equinox of date
Star training set for 4709_Ennomos, (2026/09/19 05:01UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 13.03 159 Alhena 06:37:42.8 +16:23:56 1.9 9.29 166 62Chi2Ori 06:03:55.2 +20:08:18 4.5 0.44 172 PPM 095290 06:03:06.9 +20:35:11 7.7 0.33 173 PPM 095234 06:01:15.3 +20:25:12 9.3 0.25 172 4709_Ennomos 06:02:13.5 +20:19:29 14.3 172 Positions are for J2000