RECON observing guide for 11887_Echemmon_20250722075203

Occultation event with (11887) Echemmon, event index number 1157
Regions able to see the event: SAmericaN

Geocentric closest approach at 2025/07/22 07:52:03 UTC

J2000 position of star is 03:02:03.3 +27:06:11
Equinox of date position of star is 03:03:34.5 +27:12:09
Star is 36 degrees from the moon. Moon is 8% illuminated.
Stellar brightness G=15.6, apparent brightess of occulting body is G=16.3
Use an exposure time of 0.40 seconds with the standard RECON-QHY system.
SNR of 3.3 per integration for unocculted signal
Expected flux drop is 64% with SNR of 2.1 for the occulted depth (per occulted point)

Apparent velocity is 23.0 km/sec on the sky relative to the star, or, 22.5 arcsec/hr.
The recommended exposure time corresponds to 9.2 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 14.5 km.
The sky-plane scale is 3679.6 km/arcsec.

Diameter estimates:
40.7 km assuming a 5% albedo, aximum of 1.8 sec for a central chord
16.6 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 40.7 km used for deployment plan.

Star training set for 11887_Echemmon, (2025/07/22 07:52UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:23.4 +16:33:31  0.8 24.17  20
44Zet Per      03:55:44.7 +31:57:27  2.8 12.29  25
49 Ari         03:03:24.9 +26:33:42  6.0  0.64  37
PPM 092163     03:03:57.3 +26:42:26  7.1  0.50  36
PPM 092152     03:03:05.4 +27:05:29 11.3  0.15  37
11887_Echemmon 03:03:34.5 +27:12:09 16.3        36
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 11887_Echemmon, (2025/07/22 07:52UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.4 +16:30:29  0.8 24.17  20
44Zet Per      03:54:07.9 +31:53:01  2.8 12.29  25
49 Ari         03:01:54.1 +26:27:44  6.0  0.64  37
PPM 092163     03:02:26.5 +26:36:29  7.1  0.50  36
PPM 092152     03:01:34.3 +26:59:31 11.3  0.15  37
11887_Echemmon 03:02:03.3 +27:06:11 16.3        36
Positions are for J2000


Created by recondetail.pro, 2025/03/01 08:35:46 MT