Occultation event with (2146) Stentor, event index number 3937
Regions able to see the event: Australia
Geocentric closest approach at 2026/08/04 10:12:27 UTC
J2000 position of star is 12:14:51.7 +28:37:49
Equinox of date position of star is 12:16:12.2 +28:28:58
Star is 137 degrees from the moon. Moon is 68% illuminated.
Stellar brightness G=8.4, apparent brightess of occulting body is G=16.1
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 89.2 per integration for unocculted signal
Expected flux drop is 100% with SNR of 89.1 for the occulted depth (per occulted point)
Apparent velocity is 33.5 km/sec on the sky relative to the star, or, 26.8 arcsec/hr.
Position angle of asteroid motion is 121.0 degrees
The recommended exposure time corresponds to 4.0 km per image.
The 1-sigma error in the time of the event is 0.5 seconds.
The 1-sigma cross-track error in the shadow position is 29.2 km.
The sky-plane scale is 4508.5 km/arcsec.
Diameter estimates:
59.4 km assuming a 5% albedo, maximum of 1.8 sec for a central chord
24.3 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 50.8 km used for deployment plan.
Star training set for 2146_Stentor, (2026/08/04 10:12UT) Object RA Dec mag sep mel Arcturus 14:16:52.6 +19:02:44 0.0 29.08 145 Denebola 11:50:24.9 +14:25:24 2.1 15.28 147 PPM 101779 12:18:50.7 +28:47:24 5.7 0.66 137 PPM 101721 12:13:21.9 +28:23:17 6.7 0.63 137 PPM 101752 12:16:12.2 +28:28:57 9.7 0.00 137 2146_Stentor 12:16:12.2 +28:28:58 16.1 138 Positions are for equinox of date
Star training set for 2146_Stentor, (2026/08/04 10:12UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 29.08 145 Denebola 11:49:02.7 +14:34:16 2.1 15.28 147 PPM 101779 12:17:30.5 +28:56:15 5.7 0.66 137 PPM 101721 12:12:01.2 +28:32:09 6.7 0.63 137 PPM 101752 12:14:51.7 +28:37:49 9.7 0.00 137 2146_Stentor 12:14:51.7 +28:37:49 16.1 137 Positions are for J2000