RECON observing guide for 1437_Diomedes_20250704195430

Occultation event with (1437) Diomedes, event index number 1110
Regions able to see the event: SAfrica

Geocentric closest approach at 2025/07/04 19:54:30 UTC

J2000 position of star is 11:14:12.4 -11:33:14
Equinox of date position of star is 11:15:29.5 -11:41:36
Star is 42 degrees from the moon. Moon is 69% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=14.0
Use an exposure time of 1.55 seconds with the standard RECON-QHY system.
SNR of 4.3 per integration for unocculted signal
Expected flux drop is 13% with SNR of 0.5 for the occulted depth (per occulted point)

Apparent velocity is 22.0 km/sec on the sky relative to the star, or, 19.9 arcsec/hr.
The recommended exposure time corresponds to 34.1 km per image.
The 1-sigma error in the time of the event is 1.7 seconds.
The 1-sigma cross-track error in the shadow position is 31.5 km.
The sky-plane scale is 3975.4 km/arcsec.

Diameter estimates:
139.3 km assuming a 5% albedo, aximum of 6.3 sec for a central chord
56.9 km assuming a 30% albedo, maximum of 2.6 sec for a central chord
Cross-track diameter of 139.3 km used for deployment plan.

Star training set for 1437_Diomedes, (2025/07/04 19:55UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:43.7 +11:50:30  1.3 28.64  65
4Gam Crv       12:17:07.3 -17:41:00  2.6 16.05  26
PPM 224159     11:16:56.7 -12:43:56  6.5  1.10  41
PPM 224154     11:16:40.7 -11:43:40  7.0  0.29  42
1437_Diomedes  11:15:29.5 -11:41:36 14.0        42
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 1437_Diomedes, (2025/07/04 19:55UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3 28.64  65
4Gam Crv       12:15:48.1 -17:32:30  2.6 16.05  26
PPM 224159     11:15:39.8 -12:35:34  6.5  1.10  41
PPM 224154     11:15:23.6 -11:35:18  7.0  0.29  42
1437_Diomedes  11:14:12.4 -11:33:14 14.0        42
Positions are for J2000


Created by recondetail.pro, 2025/03/15 10:15:02 MT