Occultation event with (7815) Dolon, event index number 5125
Regions able to see the event: Senegal,SMexico
Geocentric closest approach at 2026/12/09 02:44:31 UTC
J2000 position of star is 03:54:38.6 -05:03:55
Equinox of date position of star is 03:55:58.8 -04:59:15
Star is 143 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=16.6, apparent brightess of occulting body is G=15.2
Use an exposure time of 1.35 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 21% with SNR of 0.6 for the occulted depth (per occulted point)
Apparent velocity is 15.3 km/sec on the sky relative to the star, or, 18.1 arcsec/hr.
Position angle of asteroid motion is 94.0 degrees
The recommended exposure time corresponds to 20.6 km per image.
The 1-sigma error in the time of the event is 0.3 seconds.
The 1-sigma cross-track error in the shadow position is 32.2 km.
The sky-plane scale is 3040.7 km/arcsec.
Diameter estimates:
52.5 km assuming a 5% albedo, maximum of 3.4 sec for a central chord
21.4 km assuming a 30% albedo, maximum of 1.4 sec for a central chord
Cross-track diameter of 42.5 km used for deployment plan.
Star training set for 7815_Dolon, (2026/12/09 02:45UT) Object RA Dec mag sep mel Rigel 05:15:50.0 -08:10:21 0.1 20.08 144 Menkar 03:03:41.5 +04:11:38 2.5 15.96 143 30 Eri 03:54:01.6 -05:16:58 5.6 0.57 143 PPM 186336 03:56:29.5 -04:53:50 8.1 0.16 143 7815_Dolon 03:55:58.8 -04:59:15 15.2 144 Positions are for equinox of date
Star training set for 7815_Dolon, (2026/12/09 02:45UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 20.08 144 Menkar 03:02:16.8 +04:05:21 2.5 15.96 143 30 Eri 03:52:41.7 -05:21:41 5.6 0.57 143 PPM 186336 03:55:09.3 -04:58:29 8.1 0.16 143 7815_Dolon 03:54:38.6 -05:03:55 15.2 143 Positions are for J2000