Occultation event with (4827) Dares, event index number 5173
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/12/11 07:55:23 UTC
J2000 position of star is 05:46:00.1 +19:36:21
Equinox of date position of star is 05:47:35.7 +19:36:52
Star is 161 degrees from the moon. Moon is 5% illuminated.
Stellar brightness G=13.4, apparent brightess of occulting body is G=15.0
Use an exposure time of 0.15 seconds with the standard RECON-QHY system.
SNR of 9.6 per integration for unocculted signal
Expected flux drop is 82% with SNR of 7.9 for the occulted depth (per occulted point)
Apparent velocity is 16.6 km/sec on the sky relative to the star, or, 20.8 arcsec/hr.
Position angle of asteroid motion is 82.0 degrees
The recommended exposure time corresponds to 2.5 km per image.
The 1-sigma error in the time of the event is 0.1 seconds.
The 1-sigma cross-track error in the shadow position is 31.8 km.
The sky-plane scale is 2875.3 km/arcsec.
Diameter estimates:
46.3 km assuming a 5% albedo, maximum of 2.8 sec for a central chord
18.9 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 42.8 km used for deployment plan.
Star training set for 4827_Dares, (2026/12/11 07:55UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.9 +07:24:35 0.4 12.40 156 Alnath 05:27:59.9 +28:37:39 1.6 10.06 158 PPM 121513 05:53:59.2 +19:52:21 6.4 1.53 163 PPM 121323 05:45:08.8 +19:33:02 8.5 0.58 161 PPM 121364 05:47:06.6 +19:24:20 9.1 0.24 161 4827_Dares 05:47:35.7 +19:36:52 15.0 162 Positions are for equinox of date
Star training set for 4827_Dares, (2026/12/11 07:55UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 12.40 156 Alnath 05:26:17.6 +28:36:22 1.6 10.06 158 PPM 121513 05:52:23.4 +19:52:04 6.4 1.53 163 PPM 121323 05:43:33.2 +19:32:25 8.5 0.58 161 PPM 121364 05:45:31.1 +19:23:48 9.1 0.24 161 4827_Dares 05:46:00.1 +19:36:21 15.0 161 Positions are for J2000