Occultation event with (4827) Dares, event index number 1363
Regions able to see the event: NMexico,SMexico
Geocentric closest approach at 2025/10/12 10:22:23 UTC
J2000 position of star is 03:18:27.7 +20:55:00
Equinox of date position of star is 03:19:57.0 +21:00:34
Star is 39 degrees from the moon. Moon is 65% illuminated.
Stellar brightness G=15.5, apparent brightess of occulting body is G=15.4
Use an exposure time of 0.90 seconds with the standard RECON-QHY system.
SNR of 6.5 per integration for unocculted signal
Expected flux drop is 48% with SNR of 3.1 for the occulted depth (per occulted point)
Apparent velocity is 11.6 km/sec on the sky relative to the star, or, 14.2 arcsec/hr.
Position angle of asteroid motion is 69.5 degrees
The recommended exposure time corresponds to 10.4 km per image.
The 1-sigma error in the time of the event is 1.2 seconds.
The 1-sigma cross-track error in the shadow position is 25.6 km.
The sky-plane scale is 2932.7 km/arcsec.
Diameter estimates:
46.3 km assuming a 5% albedo, maximum of 4.0 sec for a central chord
18.9 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 42.8 km used for deployment plan.
Star training set for 4827_Dares, (2025/10/12 10:22UT) Object RA Dec mag sep mel Aldebaran 04:37:24.2 +16:33:32 0.8 18.85 25 44Zet Per 03:55:45.6 +31:57:29 2.8 13.55 29 61Tau1Ari 03:22:43.2 +21:14:17 5.3 0.69 39 PPM 092331 03:17:22.5 +20:47:45 8.2 0.64 40 PPM 092379 03:20:10.4 +20:50:29 9.9 0.18 39 4827_Dares 03:19:57.0 +21:00:34 15.4 39 Positions are for equinox of date
Star training set for 4827_Dares, (2025/10/12 10:22UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 18.85 25 44Zet Per 03:54:07.9 +31:53:01 2.8 13.55 29 61Tau1Ari 03:21:13.7 +21:08:49 5.3 0.69 39 PPM 092331 03:15:53.3 +20:42:08 8.2 0.64 40 PPM 092379 03:18:41.1 +20:44:56 9.9 0.18 39 4827_Dares 03:18:27.7 +20:55:00 15.4 39 Positions are for J2000