Occultation event with (7815) Dolon, event index number 1029
Regions able to see the event: NZ
Geocentric closest approach at 2025/06/04 16:44:33 UTC
J2000 position of star is 01:23:16.5 -04:24:42
Equinox of date position of star is 01:24:33.8 -04:16:46
Star is 160 degrees from the moon. Moon is 65% illuminated.
Stellar brightness G=15.4, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.40 seconds with the standard RECON-QHY system.
SNR of 4.0 per integration for unocculted signal
Expected flux drop is 60% with SNR of 2.4 for the occulted depth (per occulted point)
Apparent velocity is 30.8 km/sec on the sky relative to the star, or, 28.2 arcsec/hr.
The recommended exposure time corresponds to 12.3 km per image.
The 1-sigma error in the time of the event is 1.4 seconds.
The 1-sigma cross-track error in the shadow position is 7.2 km.
The sky-plane scale is 3930.2 km/arcsec.
Diameter estimates:
52.5 km assuming a 5% albedo, aximum of 1.7 sec for a central chord
21.4 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 52.5 km used for deployment plan.
Star training set for 7815_Dolon, (2025/06/04 16:45UT) Object RA Dec mag sep mel Fomalhaut 22:59:03.0 -29:29:13 1.2 42.64 145 68Omi Cet 02:20:38.0 -02:51:49 2.0 14.06 146 PPM 183408 01:26:06.3 -02:43:01 6.1 1.61 160 PPM 183357 01:23:24.6 -04:25:55 8.4 0.33 160 PPM 183385 01:24:41.2 -04:05:16 9.2 0.19 160 7815_Dolon 01:24:33.8 -04:16:46 15.9 159 Positions are for equinox of date
Star training set for 7815_Dolon, (2025/06/04 16:45UT) Object RA Dec mag sep mel Fomalhaut 22:57:39.7 -29:37:24 1.2 42.64 145 68Omi Cet 02:19:20.8 -02:58:46 2.0 14.06 146 PPM 183408 01:24:48.7 -02:50:56 6.1 1.61 160 PPM 183357 01:22:07.3 -04:33:52 8.4 0.33 160 PPM 183385 01:23:23.9 -04:13:12 9.2 0.19 160 7815_Dolon 01:23:16.5 -04:24:42 15.9 160 Positions are for J2000