RECON observing guide for 2241_Alcathous_20250731200603

Occultation event with (2241) Alcathous, event index number 1178
Regions able to see the event: Australia

Geocentric closest approach at 2025/07/31 20:06:03 UTC

J2000 position of star is 01:29:43.4 +26:48:14
Equinox of date position of star is 01:31:08.8 +26:56:08
Star is 167 degrees from the moon. Moon is 44% illuminated.
Stellar brightness G=15.0, apparent brightess of occulting body is G=14.3
Use an exposure time of 1.15 seconds with the standard RECON-QHY system.
SNR of 10.0 per integration for unocculted signal
Expected flux drop is 36% with SNR of 3.6 for the occulted depth (per occulted point)

Apparent velocity is 9.9 km/sec on the sky relative to the star, or, 9.3 arcsec/hr.
The recommended exposure time corresponds to 11.4 km per image.
The 1-sigma error in the time of the event is 2.1 seconds.
The 1-sigma cross-track error in the shadow position is 31.2 km.
The sky-plane scale is 3837.6 km/arcsec.

Diameter estimates:
118.6 km assuming a 5% albedo, aximum of 12.0 sec for a central chord
48.4 km assuming a 30% albedo, maximum of 4.9 sec for a central chord
Cross-track diameter of 118.6 km used for deployment plan.

Star training set for 2241_Alcathous, (2025/07/31 20:06UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:23.5 +16:33:31  0.8 44.22 141
6Bet Ari       01:56:03.5 +20:55:55  2.6  8.27 174
90Ups Psc      01:20:52.8 +27:23:52  4.8  2.33 166
PPM 090846     01:32:05.4 +26:28:49  8.5  0.50 168
PPM 090841     01:31:56.7 +26:52:51  9.2  0.19 167
2241_Alcathous 01:31:08.8 +26:56:08 14.3       167
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 2241_Alcathous, (2025/07/31 20:06UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.4 +16:30:29  0.8 44.22 141
6Bet Ari       01:54:38.6 +20:48:26  2.6  8.27 174
90Ups Psc      01:19:28.0 +27:15:50  4.8  2.33 166
PPM 090846     01:30:40.2 +26:20:57  8.5  0.50 168
PPM 090841     01:30:31.4 +26:44:58  9.2  0.19 167
2241_Alcathous 01:29:43.4 +26:48:14 14.3       167
Positions are for J2000


Created by recondetail.pro, 2025/03/01 09:08:33 MT