Occultation event with (2241) Alcathous, event index number 4546
Regions able to see the event: NMexico,SMexico
Geocentric closest approach at 2026/11/02 12:13:28 UTC
J2000 position of star is 03:28:26.1 +30:39:55
Equinox of date position of star is 03:30:05.4 +30:45:24
Star is 81 degrees from the moon. Moon is 43% illuminated.
Stellar brightness G=16.3, apparent brightess of occulting body is G=13.6
Use an exposure time of 1.65 seconds with the standard RECON-QHY system.
SNR of 3.2 per integration for unocculted signal
Expected flux drop is 8% with SNR of 0.2 for the occulted depth (per occulted point)
Apparent velocity is 16.8 km/sec on the sky relative to the star, or, 18.4 arcsec/hr.
Position angle of asteroid motion is 71.0 degrees
The recommended exposure time corresponds to 27.7 km per image.
The 1-sigma error in the time of the event is 0.8 seconds.
The 1-sigma cross-track error in the shadow position is 36.1 km.
The sky-plane scale is 3272.8 km/arcsec.
Diameter estimates:
118.6 km assuming a 5% albedo, maximum of 7.1 sec for a central chord
48.4 km assuming a 30% albedo, maximum of 2.9 sec for a central chord
Cross-track diameter of 113.7 km used for deployment plan.
Star training set for 2241_Alcathous, (2026/11/02 12:13UT) Object RA Dec mag sep mel Aldebaran 04:37:27.8 +16:33:40 0.8 20.91 69 44Zet Per 03:55:49.6 +31:57:40 2.8 5.62 76 PPM 092402 03:21:58.2 +29:08:38 4.5 2.39 83 PPM 068498 03:30:25.9 +30:27:59 7.6 0.30 81 PPM 068474 03:29:08.6 +30:48:46 11.2 0.21 81 2241_Alcathous 03:30:05.4 +30:45:24 13.6 81 Positions are for equinox of date
Star training set for 2241_Alcathous, (2026/11/02 12:13UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 20.91 69 44Zet Per 03:54:07.9 +31:53:01 2.8 5.62 76 PPM 092402 03:20:20.3 +29:02:54 4.5 2.39 83 PPM 068498 03:28:46.7 +30:22:31 7.6 0.30 81 PPM 068474 03:27:29.3 +30:43:15 11.2 0.21 81 2241_Alcathous 03:28:26.1 +30:39:55 13.6 81 Positions are for J2000