Occultation event with (4709) Ennomos, event index number 1377
Regions able to see the event: Europe
Geocentric closest approach at 2025/10/16 22:44:56 UTC
J2000 position of star is 03:47:55.1 +30:19:46
Equinox of date position of star is 03:49:31.3 +30:24:26
Star is 91 degrees from the moon. Moon is 19% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=13.8
Use an exposure time of 1.80 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 8% with SNR of 0.2 for the occulted depth (per occulted point)
Apparent velocity is 12.4 km/sec on the sky relative to the star, or, 13.9 arcsec/hr.
Position angle of asteroid motion is 66.1 degrees
The recommended exposure time corresponds to 22.3 km per image.
The 1-sigma error in the time of the event is 0.7 seconds.
The 1-sigma cross-track error in the shadow position is 38.9 km.
The sky-plane scale is 3214.3 km/arcsec.
Diameter estimates:
114.3 km assuming a 5% albedo, aximum of 9.2 sec for a central chord
46.7 km assuming a 30% albedo, maximum of 3.8 sec for a central chord
Cross-track diameter of 91.4 km used for deployment plan.
Star training set for 4709_Ennomos, (2025/10/16 22:45UT) Object RA Dec mag sep mel Aldebaran 04:37:24.2 +16:33:32 0.8 17.64 83 44Zet Per 03:55:45.6 +31:57:29 2.8 2.05 89 PPM 068850 03:53:41.5 +31:14:38 6.3 1.23 90 PPM 092893 03:49:01.6 +29:57:14 8.3 0.47 91 PPM 068795 03:50:12.1 +30:44:01 9.6 0.36 91 PPM 068773 03:48:51.4 +30:13:39 10.5 0.23 91 4709_Ennomos 03:49:31.3 +30:24:26 13.8 90 Positions are for equinox of date
Star training set for 4709_Ennomos, (2025/10/16 22:45UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 17.64 83 44Zet Per 03:54:07.9 +31:53:01 2.8 2.05 89 PPM 068850 03:52:04.4 +31:10:06 6.3 1.23 90 PPM 092893 03:47:25.7 +29:52:33 8.3 0.47 91 PPM 068795 03:48:35.6 +30:39:23 9.6 0.36 91 PPM 068773 03:47:15.3 +30:08:58 10.5 0.23 91 4709_Ennomos 03:47:55.1 +30:19:46 13.8 91 Positions are for J2000