Occultation event with (4834) Thoas, event index number 3365
Regions able to see the event: Europe
Geocentric closest approach at 2026/03/06 19:45:49 UTC
J2000 position of star is 12:55:49.1 +31:20:41
Equinox of date position of star is 12:57:04.4 +31:12:12
Star is 46 degrees from the moon. Moon is 89% illuminated.
Stellar brightness G=14.5, apparent brightess of occulting body is G=14.3
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 9.6 per integration for unocculted signal
Expected flux drop is 47% with SNR of 4.5 for the occulted depth (per occulted point)
Apparent velocity is 16.8 km/sec on the sky relative to the star, or, 18.7 arcsec/hr.
Position angle of asteroid motion is 126.0 degrees
The recommended exposure time corresponds to 9.2 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 12.9 km.
The sky-plane scale is 3236.9 km/arcsec.
Diameter estimates:
89.1 km assuming a 5% albedo, maximum of 5.3 sec for a central chord
36.4 km assuming a 30% albedo, maximum of 2.2 sec for a central chord
Cross-track diameter of 72.3 km used for deployment plan.
Star training set for 4834_Thoas, (2026/03/06 19:46UT) Object RA Dec mag sep mel Arcturus 14:16:51.4 +19:02:51 0.0 21.71 35 Alkaid 13:48:34.2 +49:11:00 1.9 20.43 63 37 Com 13:01:31.5 +30:38:40 6.1 1.11 45 PPM 076763 12:52:15.2 +31:20:02 8.1 1.04 46 PPM 076832 12:59:29.5 +30:51:39 9.7 0.62 45 PPM 076812 12:56:57.9 +31:32:48 10.4 0.34 46 4834_Thoas 12:57:04.4 +31:12:12 14.3 45 Positions are for equinox of date
Star training set for 4834_Thoas, (2026/03/06 19:46UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 21.71 35 Alkaid 13:47:32.1 +49:18:48 1.9 20.43 63 37 Com 13:00:16.4 +30:47:06 6.1 1.11 45 PPM 076763 12:50:59.4 +31:28:33 8.1 1.04 46 PPM 076832 12:58:14.4 +31:00:06 9.7 0.62 45 PPM 076812 12:55:42.6 +31:41:17 10.4 0.34 46 4834_Thoas 12:55:49.1 +31:20:41 14.3 46 Positions are for J2000