Occultation event with (4902) Thessandrus, event index number 3224
Regions able to see the event: Australia,NZ
Geocentric closest approach at 2026/02/07 13:34:03 UTC
J2000 position of star is 11:46:25.2 +01:20:18
Equinox of date position of star is 11:47:45.6 +01:11:36
Star is 31 degrees from the moon. Moon is 69% illuminated.
Stellar brightness G=14.1, apparent brightess of occulting body is G=14.9
Use an exposure time of 0.30 seconds with the standard RECON-QHY system.
SNR of 9.0 per integration for unocculted signal
Expected flux drop is 68% with SNR of 6.1 for the occulted depth (per occulted point)
Apparent velocity is 11.0 km/sec on the sky relative to the star, or, 12.5 arcsec/hr.
Position angle of asteroid motion is 124.0 degrees
The recommended exposure time corresponds to 3.3 km per image.
The 1-sigma error in the time of the event is 2.6 seconds.
The 1-sigma cross-track error in the shadow position is 25.2 km.
The sky-plane scale is 3164.5 km/arcsec.
Diameter estimates:
64.9 km assuming a 5% albedo, maximum of 5.9 sec for a central chord
26.5 km assuming a 30% albedo, maximum of 2.4 sec for a central chord
Cross-track diameter of 51.3 km used for deployment plan.
Star training set for 4902_Thessandrus, (2026/02/07 13:34UT) Object RA Dec mag sep mel Regulus 10:09:45.6 +11:50:19 1.3 26.53 57 Denebola 11:50:23.4 +14:25:34 2.1 13.25 39 5Bet Vir 11:52:03.3 +01:37:03 3.6 1.15 30 PPM 158245 11:51:07.0 +02:05:11 8.0 1.23 31 PPM 158188 11:47:34.6 +01:23:50 9.8 0.21 31 4902_Thessandr 11:47:45.6 +01:11:36 14.9 31 Positions are for equinox of date
Star training set for 4902_Thessandrus, (2026/02/07 13:34UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 26.53 57 Denebola 11:49:02.7 +14:34:16 2.1 13.25 39 5Bet Vir 11:50:43.0 +01:45:46 3.6 1.15 30 PPM 158245 11:49:46.7 +02:13:54 8.0 1.23 31 PPM 158188 11:46:14.3 +01:32:32 9.8 0.21 31 4902_Thessandr 11:46:25.2 +01:20:18 14.9 31 Positions are for J2000