Occultation event with (7815) Dolon, event index number 954
Regions able to see the event: Australia
Geocentric closest approach at 2025/05/07 20:24:10 UTC
J2000 position of star is 01:00:38.3 -05:25:22
Equinox of date position of star is 01:01:55.4 -05:17:12
Star is 160 degrees from the moon. Moon is 80% illuminated.
Stellar brightness G=14.0, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.25 seconds with the standard RECON-QHY system.
SNR of 9.1 per integration for unocculted signal
Expected flux drop is 85% with SNR of 7.8 for the occulted depth (per occulted point)
Apparent velocity is 38.1 km/sec on the sky relative to the star, or, 33.1 arcsec/hr.
The recommended exposure time corresponds to 9.5 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 12.2 km.
The sky-plane scale is 4145.5 km/arcsec.
Diameter estimates:
52.5 km assuming a 5% albedo, aximum of 1.4 sec for a central chord
21.4 km assuming a 30% albedo, maximum of 0.6 sec for a central chord
Cross-track diameter of 52.5 km used for deployment plan.
Star training set for 7815_Dolon, (2025/05/07 20:24UT) Object RA Dec mag sep mel Fomalhaut 22:59:02.7 -29:29:15 1.2 37.77 151 Diphda 00:44:51.6 -17:50:52 2.0 13.24 158 25 Cet 01:04:19.5 -04:42:06 5.3 0.84 159 PPM 182889 01:00:02.8 -05:44:49 6.6 0.66 160 PPM 182929 01:02:17.4 -05:10:57 9.8 0.14 160 7815_Dolon 01:01:55.4 -05:17:12 15.9 160 Positions are for equinox of date
Star training set for 7815_Dolon, (2025/05/07 20:24UT) Object RA Dec mag sep mel Fomalhaut 22:57:39.7 -29:37:24 1.2 37.77 151 Diphda 00:43:35.8 -17:59:11 2.0 13.24 158 25 Cet 01:03:02.4 -04:50:15 5.3 0.84 159 PPM 182889 00:58:45.8 -05:53:00 6.6 0.66 160 PPM 182929 01:01:00.3 -05:19:06 9.8 0.14 160 7815_Dolon 01:00:38.3 -05:25:22 15.9 160 Positions are for J2000