Occultation event with (4827) Dares, event index number 1059
Regions able to see the event: SAfrica
Geocentric closest approach at 2025/06/15 03:21:48 UTC
J2000 position of star is 02:38:29.4 +18:38:38
Equinox of date position of star is 02:39:55.1 +18:45:10
Star is 94 degrees from the moon. Moon is 86% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=16.1
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 52% with SNR of 1.6 for the occulted depth (per occulted point)
Apparent velocity is 35.8 km/sec on the sky relative to the star, or, 31.5 arcsec/hr.
The recommended exposure time corresponds to 21.5 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 12.9 km.
The sky-plane scale is 4085.2 km/arcsec.
Diameter estimates:
46.3 km assuming a 5% albedo, aximum of 1.3 sec for a central chord
18.9 km assuming a 30% albedo, maximum of 0.5 sec for a central chord
Cross-track diameter of 46.3 km used for deployment plan.
Star training set for 4827_Dares, (2025/06/15 03:22UT) Object RA Dec mag sep mel Aldebaran 04:37:23.1 +16:33:30 0.8 28.04 120 Hamal 02:08:36.9 +23:34:54 2.0 8.75 90 36 Ari 02:45:44.7 +17:52:13 6.4 1.64 95 PPM 118435 02:41:58.7 +18:42:28 8.0 0.49 95 PPM 118396 02:39:08.5 +18:32:32 10.9 0.28 94 4827_Dares 02:39:55.1 +18:45:10 16.1 95 Positions are for equinox of date
Star training set for 4827_Dares, (2025/06/15 03:22UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 28.04 120 Hamal 02:07:10.8 +23:27:41 2.0 8.75 90 36 Ari 02:44:19.2 +17:45:49 6.4 1.64 95 PPM 118435 02:40:33.0 +18:36:00 8.0 0.49 95 PPM 118396 02:37:42.9 +18:25:59 10.9 0.28 94 4827_Dares 02:38:29.4 +18:38:38 16.1 94 Positions are for J2000