Occultation event with (2146) Stentor, event index number 3685
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/04/26 01:14:20 UTC
J2000 position of star is 11:49:03.0 +35:40:07
Equinox of date position of star is 11:50:25.0 +35:31:20
Star is 33 degrees from the moon. Moon is 71% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=15.6
Use an exposure time of 1.30 seconds with the standard RECON-QHY system.
SNR of 3.5 per integration for unocculted signal
Expected flux drop is 31% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 9.4 km/sec on the sky relative to the star, or, 9.4 arcsec/hr.
Position angle of asteroid motion is 82.0 degrees
The recommended exposure time corresponds to 12.2 km per image.
The 1-sigma error in the time of the event is 0.9 seconds.
The 1-sigma cross-track error in the shadow position is 32.4 km.
The sky-plane scale is 3581.9 km/arcsec.
Diameter estimates:
59.4 km assuming a 5% albedo, maximum of 6.3 sec for a central chord
24.3 km assuming a 30% albedo, maximum of 2.6 sec for a central chord
Cross-track diameter of 50.8 km used for deployment plan.
Star training set for 2146_Stentor, (2026/04/26 01:14UT) Object RA Dec mag sep mel Regulus 10:09:46.3 +11:50:15 1.3 32.84 0 68Del Leo 11:15:30.2 +20:22:45 2.6 16.97 18 PPM 076096 11:51:03.4 +34:47:08 6.2 0.75 32 PPM 076063 11:46:57.4 +35:44:54 8.6 0.74 32 PPM 076106 11:51:44.1 +35:34:55 10.9 0.27 33 2146_Stentor 11:50:25.0 +35:31:20 15.6 33 Positions are for equinox of date
Star training set for 2146_Stentor, (2026/04/26 01:14UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 32.84 0 68Del Leo 11:14:06.8 +20:31:22 2.6 16.97 18 PPM 076096 11:49:41.5 +34:55:55 6.2 0.75 32 PPM 076063 11:45:35.0 +35:53:40 8.6 0.74 32 PPM 076106 11:50:22.2 +35:43:42 10.9 0.27 33 2146_Stentor 11:49:03.0 +35:40:07 15.6 33 Positions are for J2000