Occultation event with (4827) Dares, event index number 3306
Regions able to see the event: SMexico
Geocentric closest approach at 2026/02/25 04:17:08 UTC
J2000 position of star is 03:00:21.2 +17:30:37
Equinox of date position of star is 03:01:49.4 +17:36:45
Star is 28 degrees from the moon. Moon is 58% illuminated.
Stellar brightness G=12.9, 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 11.5 per integration for unocculted signal
Expected flux drop is 95% with SNR of 10.9 for the occulted depth (per occulted point)
Apparent velocity is 22.7 km/sec on the sky relative to the star, or, 21.9 arcsec/hr.
Position angle of asteroid motion is 78.8 degrees
The recommended exposure time corresponds to 2.7 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 26.4 km.
The sky-plane scale is 3720.3 km/arcsec.
Diameter estimates:
46.3 km assuming a 5% albedo, maximum of 2.0 sec for a central chord
18.9 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 42.8 km used for deployment plan.
Star training set for 4827_Dares, (2026/02/25 04:17UT) Object RA Dec mag sep mel Aldebaran 04:37:25.5 +16:33:35 0.8 22.85 12 Menkar 03:03:39.0 +04:11:27 2.5 13.43 36 46Rho3Ari 02:57:55.0 +18:07:33 5.6 1.06 29 PPM 118705 02:59:23.2 +17:55:01 8.2 0.66 28 PPM 118714 03:00:14.2 +17:36:58 9.9 0.38 28 4827_Dares 03:01:49.4 +17:36:45 16.1 28 Positions are for equinox of date
Star training set for 4827_Dares, (2026/02/25 04:17UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 22.85 12 Menkar 03:02:16.8 +04:05:21 2.5 13.43 36 46Rho3Ari 02:56:26.6 +18:01:18 5.6 1.06 29 PPM 118705 02:57:54.8 +17:48:48 8.2 0.66 28 PPM 118714 02:58:46.0 +17:30:47 9.9 0.38 28 4827_Dares 03:00:21.2 +17:30:37 16.1 28 Positions are for J2000