Occultation event with (2146) Stentor, event index number 3186
Regions able to see the event: Australia
Geocentric closest approach at 2026/01/29 16:39:35 UTC
J2000 position of star is 12:23:31.1 +28:29:18
Equinox of date position of star is 12:24:49.3 +28:20:38
Star is 85 degrees from the moon. Moon is 86% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 7.4 per integration for unocculted signal
Expected flux drop is 60% with SNR of 4.4 for the occulted depth (per occulted point)
Apparent velocity is 19.2 km/sec on the sky relative to the star, or, 19.9 arcsec/hr.
Position angle of asteroid motion is 171.4 degrees
The recommended exposure time corresponds to 12.5 km per image.
The 1-sigma error in the time of the event is 1.7 seconds.
The 1-sigma cross-track error in the shadow position is 6.1 km.
The sky-plane scale is 3469.4 km/arcsec.
Diameter estimates:
59.4 km assuming a 5% albedo, maximum of 3.1 sec for a central chord
24.3 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 50.8 km used for deployment plan.
Star training set for 2146_Stentor, (2026/01/29 16:40UT) Object RA Dec mag sep mel Arcturus 14:16:51.2 +19:02:53 0.0 27.20 111 Denebola 11:50:23.3 +14:25:34 2.1 16.05 84 15Gam Com 12:28:14.1 +28:07:25 4.4 0.78 85 PPM 101814 12:21:09.1 +28:19:11 6.6 0.81 84 PPM 101867 12:25:30.7 +28:15:43 10.7 0.17 85 2146_Stentor 12:24:49.3 +28:20:38 15.5 85 Positions are for equinox of date
Star training set for 2146_Stentor, (2026/01/29 16:40UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 27.20 111 Denebola 11:49:02.7 +14:34:16 2.1 16.05 84 15Gam Com 12:26:56.1 +28:16:04 4.4 0.78 85 PPM 101814 12:19:50.6 +28:27:51 6.6 0.81 84 PPM 101867 12:24:12.6 +28:24:23 10.7 0.17 85 2146_Stentor 12:23:31.1 +28:29:18 15.5 85 Positions are for J2000