Occultation event with (4827) Dares, event index number 1406
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/10/24 06:57:17 UTC
J2000 position of star is 03:13:15.6 +20:27:36
Equinox of date position of star is 03:14:44.6 +20:33:19
Star is 170 degrees from the moon. Moon is 7% illuminated.
Stellar brightness G=15.7, apparent brightess of occulting body is G=15.2
Use an exposure time of 0.70 seconds with the standard RECON-QHY system.
SNR of 4.5 per integration for unocculted signal
Expected flux drop is 39% with SNR of 1.7 for the occulted depth (per occulted point)
Apparent velocity is 14.7 km/sec on the sky relative to the star, or, 18.4 arcsec/hr.
Position angle of asteroid motion is 69.2 degrees
The recommended exposure time corresponds to 10.3 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 26.0 km.
The sky-plane scale is 2873.1 km/arcsec.
Diameter estimates:
46.3 km assuming a 5% albedo, aximum of 3.2 sec for a central chord
18.9 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 42.8 km used for deployment plan.
Star training set for 4827_Dares, (2025/10/24 06:57UT) Object RA Dec mag sep mel Aldebaran 04:37:24.3 +16:33:33 0.8 19.98 167 44Zet Per 03:55:45.7 +31:57:29 2.8 14.63 173 58Zet Ari 03:16:23.4 +21:08:18 4.9 0.70 170 PPM 092331 03:17:22.6 +20:47:46 8.2 0.66 170 PPM 092297 03:14:13.4 +20:29:40 9.5 0.14 170 4827_Dares 03:14:44.6 +20:33:19 15.2 170 Positions are for equinox of date
Star training set for 4827_Dares, (2025/10/24 06:57UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 19.98 167 44Zet Per 03:54:07.9 +31:53:01 2.8 14.63 173 58Zet Ari 03:14:54.0 +21:02:38 4.9 0.70 170 PPM 092331 03:15:53.3 +20:42:08 8.2 0.66 170 PPM 092297 03:12:44.4 +20:23:57 9.5 0.14 170 4827_Dares 03:13:15.6 +20:27:36 15.2 170 Positions are for J2000