Occultation event with (4827) Dares, event index number 1341
Regions able to see the event: Australia
Geocentric closest approach at 2025/10/06 12:57:18 UTC
J2000 position of star is 03:20:30.4 +21:05:46
Equinox of date position of star is 03:21:59.9 +21:11:15
Star is 48 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=13.9, apparent brightess of occulting body is G=15.4
Use an exposure time of 0.25 seconds with the standard RECON-QHY system.
SNR of 9.7 per integration for unocculted signal
Expected flux drop is 81% with SNR of 7.8 for the occulted depth (per occulted point)
Apparent velocity is 9.7 km/sec on the sky relative to the star, or, 11.7 arcsec/hr.
Position angle of asteroid motion is 69.3 degrees
The recommended exposure time corresponds to 2.4 km per image.
The 1-sigma error in the time of the event is 1.5 seconds.
The 1-sigma cross-track error in the shadow position is 26.6 km.
The sky-plane scale is 2971.9 km/arcsec.
Diameter estimates:
46.3 km assuming a 5% albedo, aximum of 4.8 sec for a central chord
18.9 km assuming a 30% albedo, maximum of 2.0 sec for a central chord
Cross-track diameter of 42.8 km used for deployment plan.
Star training set for 4827_Dares, (2025/10/06 12:57UT) Object RA Dec mag sep mel Aldebaran 04:37:24.1 +16:33:32 0.8 18.41 65 44Zet Per 03:55:45.5 +31:57:29 2.8 13.14 59 61Tau1Ari 03:22:43.2 +21:14:17 5.3 0.18 48 PPM 092419 03:22:20.7 +20:36:02 8.0 0.59 48 61Tau1Ari 03:22:43.2 +21:14:17 5.3 0.18 48 4827_Dares 03:21:59.9 +21:11:15 15.4 49 Positions are for equinox of date
Star training set for 4827_Dares, (2025/10/06 12:57UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 18.41 65 44Zet Per 03:54:07.9 +31:53:01 2.8 13.14 59 61Tau1Ari 03:21:13.7 +21:08:49 5.3 0.18 48 PPM 092419 03:20:51.5 +20:30:33 8.0 0.59 48 61Tau1Ari 03:21:13.7 +21:08:49 5.3 0.18 48 4827_Dares 03:20:30.4 +21:05:46 15.4 48 Positions are for J2000