Occultation event with (2241) Alcathous, event index number 4560
Regions able to see the event: Europe,SAmericaN
Geocentric closest approach at 2026/11/04 00:49:43 UTC
J2000 position of star is 03:27:36.3 +30:36:10
Equinox of date position of star is 03:29:15.6 +30:41:40
Star is 102 degrees from the moon. Moon is 27% illuminated.
Stellar brightness G=15.1, 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 9.4 per integration for unocculted signal
Expected flux drop is 20% with SNR of 1.9 for the occulted depth (per occulted point)
Apparent velocity is 17.0 km/sec on the sky relative to the star, or, 18.8 arcsec/hr.
Position angle of asteroid motion is 70.4 degrees
The recommended exposure time corresponds to 28.1 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 35.8 km.
The sky-plane scale is 3267.7 km/arcsec.
Diameter estimates:
118.6 km assuming a 5% albedo, maximum of 7.0 sec for a central chord
48.4 km assuming a 30% albedo, maximum of 2.8 sec for a central chord
Cross-track diameter of 113.7 km used for deployment plan.
Star training set for 2241_Alcathous, (2026/11/04 00:50UT) Object RA Dec mag sep mel Aldebaran 04:37:27.8 +16:33:40 0.8 21.01 89 44Zet Per 03:55:49.6 +31:57:40 2.8 5.81 96 PPM 092402 03:21:58.2 +29:08:38 4.5 2.21 104 PPM 068498 03:30:25.9 +30:27:59 7.6 0.34 102 PPM 068474 03:29:08.7 +30:48:46 11.2 0.12 102 2241_Alcathous 03:29:15.6 +30:41:40 13.6 102 Positions are for equinox of date
Star training set for 2241_Alcathous, (2026/11/04 00:50UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 21.01 89 44Zet Per 03:54:07.9 +31:53:01 2.8 5.81 96 PPM 092402 03:20:20.3 +29:02:54 4.5 2.21 104 PPM 068498 03:28:46.7 +30:22:31 7.6 0.34 102 PPM 068474 03:27:29.3 +30:43:15 11.2 0.12 102 2241_Alcathous 03:27:36.3 +30:36:10 13.6 102 Positions are for J2000