Occultation event with (4902) Thessandrus, event index number 3375
Regions able to see the event: Europe
Geocentric closest approach at 2026/03/08 02:56:28 UTC
J2000 position of star is 11:35:16.1 +03:02:29
Equinox of date position of star is 11:36:36.8 +02:53:47
Star is 49 degrees from the moon. Moon is 79% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=14.5
Use an exposure time of 1.30 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 14% with SNR of 0.4 for the occulted depth (per occulted point)
Apparent velocity is 17.0 km/sec on the sky relative to the star, or, 20.1 arcsec/hr.
Position angle of asteroid motion is 120.3 degrees
The recommended exposure time corresponds to 22.1 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 26.9 km.
The sky-plane scale is 3044.5 km/arcsec.
Diameter estimates:
64.9 km assuming a 5% albedo, maximum of 3.8 sec for a central chord
26.5 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 51.3 km used for deployment plan.
Star training set for 4902_Thessandrus, (2026/03/08 02:56UT) Object RA Dec mag sep mel Regulus 10:09:45.8 +11:50:18 1.3 23.29 72 Denebola 11:50:23.6 +14:25:32 2.1 12.02 53 89 Leo 11:35:42.4 +02:54:52 6.2 0.23 49 PPM 157999 11:36:29.3 +02:42:16 9.6 0.19 49 4902_Thessandr 11:36:36.8 +02:53:47 14.5 48 Positions are for equinox of date
Star training set for 4902_Thessandrus, (2026/03/08 02:56UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 23.29 72 Denebola 11:49:02.7 +14:34:16 2.1 12.02 53 89 Leo 11:34:21.6 +03:03:34 6.2 0.23 49 PPM 157999 11:35:08.6 +02:50:58 9.6 0.19 49 4902_Thessandr 11:35:16.1 +03:02:29 14.5 49 Positions are for J2000