Occultation event with (7815) Dolon, event index number 1052
Regions able to see the event: Australia
Geocentric closest approach at 2025/06/12 19:41:30 UTC
J2000 position of star is 01:29:10.7 -04:16:21
Equinox of date position of star is 01:30:28.0 -04:08:30
Star is 98 degrees from the moon. Moon is 98% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 44% with SNR of 1.4 for the occulted depth (per occulted point)
Apparent velocity is 28.2 km/sec on the sky relative to the star, or, 26.3 arcsec/hr.
The recommended exposure time corresponds to 18.3 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 6.9 km.
The sky-plane scale is 3854.5 km/arcsec.
Diameter estimates:
52.5 km assuming a 5% albedo, aximum of 1.9 sec for a central chord
21.4 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 52.5 km used for deployment plan.
Star training set for 7815_Dolon, (2025/06/12 19:42UT) Object RA Dec mag sep mel Fomalhaut 22:59:03.1 -29:29:13 1.2 43.86 55 68Omi Cet 02:20:38.0 -02:51:48 2.0 12.58 110 PPM 183408 01:26:06.4 -02:43:01 6.1 1.79 98 PPM 183468 01:29:12.8 -03:26:33 8.1 0.77 98 PPM 183465 01:29:06.3 -04:20:14 9.2 0.39 98 7815_Dolon 01:30:28.0 -04:08:30 15.9 99 Positions are for equinox of date
Star training set for 7815_Dolon, (2025/06/12 19:42UT) Object RA Dec mag sep mel Fomalhaut 22:57:39.7 -29:37:24 1.2 43.86 55 68Omi Cet 02:19:20.8 -02:58:46 2.0 12.58 110 PPM 183408 01:24:48.7 -02:50:56 6.1 1.79 98 PPM 183468 01:27:55.4 -03:34:25 8.1 0.77 98 PPM 183465 01:27:49.0 -04:28:07 9.2 0.39 98 7815_Dolon 01:29:10.7 -04:16:21 15.9 98 Positions are for J2000