Occultation event with (4709) Ennomos, event index number 4048
Regions able to see the event: NMexico,SMexico
Geocentric closest approach at 2026/08/19 11:01:53 UTC
J2000 position of star is 05:46:23.9 +21:30:52
Equinox of date position of star is 05:47:59.8 +21:31:22
Star is 142 degrees from the moon. Moon is 44% illuminated.
Stellar brightness G=15.3, apparent brightess of occulting body is G=14.5
Use an exposure time of 0.80 seconds with the standard RECON-QHY system.
SNR of 6.4 per integration for unocculted signal
Expected flux drop is 32% with SNR of 2.1 for the occulted depth (per occulted point)
Apparent velocity is 27.0 km/sec on the sky relative to the star, or, 23.3 arcsec/hr.
Position angle of asteroid motion is 102.2 degrees
The recommended exposure time corresponds to 21.6 km per image.
The 1-sigma error in the time of the event is 0.9 seconds.
The 1-sigma cross-track error in the shadow position is 33.8 km.
The sky-plane scale is 4162.7 km/arcsec.
Diameter estimates:
114.3 km assuming a 5% albedo, maximum of 4.2 sec for a central chord
46.7 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 91.4 km used for deployment plan.
Star training set for 4709_Ennomos, (2026/08/19 11:02UT) Object RA Dec mag sep mel Betelgeuse 05:56:36.9 +07:24:35 0.4 14.27 135 Alnath 05:27:58.7 +28:37:38 1.6 8.42 147 PPM 094621 05:41:03.2 +21:46:32 6.4 1.63 143 PPM 094790 05:46:32.1 +21:28:12 8.5 0.34 142 PPM 094832 05:47:44.6 +21:27:35 9.9 0.09 142 4709_Ennomos 05:47:59.8 +21:31:22 14.5 141 Positions are for equinox of date
Star training set for 4709_Ennomos, (2026/08/19 11:02UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 14.27 135 Alnath 05:26:17.6 +28:36:22 1.6 8.42 147 PPM 094621 05:39:27.1 +21:45:46 6.4 1.63 143 PPM 094790 05:44:56.2 +21:27:39 8.5 0.34 142 PPM 094832 05:46:08.8 +21:27:05 9.9 0.09 142 4709_Ennomos 05:46:23.9 +21:30:52 14.5 142 Positions are for J2000