Occultation event with (4709) Ennomos, event index number 1177
Regions able to see the event: Australia
Geocentric closest approach at 2025/07/31 18:20:02 UTC
J2000 position of star is 03:38:15.0 +30:16:23
Equinox of date position of star is 03:39:50.0 +30:21:19
Star is 150 degrees from the moon. Moon is 43% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=14.4
Use an exposure time of 1.30 seconds with the standard RECON-QHY system.
SNR of 4.0 per integration for unocculted signal
Expected flux drop is 17% with SNR of 0.7 for the occulted depth (per occulted point)
Apparent velocity is 21.9 km/sec on the sky relative to the star, or, 19.7 arcsec/hr.
The recommended exposure time corresponds to 28.4 km per image.
The 1-sigma error in the time of the event is 1.5 seconds.
The 1-sigma cross-track error in the shadow position is 8.9 km.
The sky-plane scale is 3988.8 km/arcsec.
Diameter estimates:
113.8 km assuming a 5% albedo, aximum of 5.2 sec for a central chord
46.5 km assuming a 30% albedo, maximum of 2.1 sec for a central chord
Cross-track diameter of 113.8 km used for deployment plan.
Star training set for 4709_Ennomos, (2025/07/31 18:20UT) Object RA Dec mag sep mel Aldebaran 04:37:23.5 +16:33:31 0.8 19.06 140 44Zet Per 03:55:44.8 +31:57:27 2.8 3.76 147 38Omi Per 03:45:55.8 +32:22:02 3.7 2.40 148 PPM 092651 03:37:46.1 +30:04:00 7.9 0.53 151 PPM 092671 03:38:46.0 +29:59:25 9.9 0.43 151 PPM 068640 03:39:30.1 +30:30:18 10.7 0.17 150 4709_Ennomos 03:39:50.0 +30:21:19 14.4 150 Positions are for equinox of date
Star training set for 4709_Ennomos, (2025/07/31 18:20UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 19.06 140 44Zet Per 03:54:07.9 +31:53:01 2.8 3.76 147 38Omi Per 03:44:19.1 +32:17:17 3.7 2.40 148 PPM 092651 03:36:11.4 +29:59:00 7.9 0.53 151 PPM 092671 03:37:11.3 +29:54:27 9.9 0.43 151 PPM 068640 03:37:55.0 +30:25:22 10.7 0.17 150 4709_Ennomos 03:38:15.0 +30:16:23 14.4 150 Positions are for J2000