RECON observing guide for 4709_Ennomos_20250731182002

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

Azimuth is measured in degrees eastward from north. North is at an azimuth of 0, due East is at an azimuth of 90 degrees, due South is 180, and due West is 270.

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


Created by recondetail.pro, 2025/03/15 10:40:54 MT