Occultation event with (7815) Dolon, event index number 3936
Regions able to see the event: SMexico
Geocentric closest approach at 2026/08/04 09:07:01 UTC
J2000 position of star is 04:05:03.1 +01:07:44
Equinox of date position of star is 04:06:25.5 +01:11:59
Star is 45 degrees from the moon. Moon is 69% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
SNR of 3.2 per integration for unocculted signal
Expected flux drop is 50% with SNR of 1.6 for the occulted depth (per occulted point)
Apparent velocity is 23.8 km/sec on the sky relative to the star, or, 22.7 arcsec/hr.
Position angle of asteroid motion is 101.0 degrees
The recommended exposure time corresponds to 11.9 km per image.
The 1-sigma error in the time of the event is 0.0 seconds.
The 1-sigma cross-track error in the shadow position is 31.6 km.
The sky-plane scale is 3777.5 km/arcsec.
Diameter estimates:
52.5 km assuming a 5% albedo, maximum of 2.2 sec for a central chord
21.4 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 42.5 km used for deployment plan.
Star training set for 7815_Dolon, (2026/08/04 09:07UT) Object RA Dec mag sep mel Aldebaran 04:37:27.0 +16:33:38 0.8 17.16 51 Menkar 03:03:40.4 +04:11:33 2.5 15.95 29 PPM 175430 04:03:58.6 -00:11:55 5.6 1.53 45 PPM 147207 04:08:04.3 +01:45:11 8.3 0.69 45 PPM 147183 04:05:58.9 +01:23:06 9.8 0.22 45 PPM 147198 04:07:05.2 +01:11:57 10.7 0.17 45 7815_Dolon 04:06:25.5 +01:11:59 15.9 45 Positions are for equinox of date
Star training set for 7815_Dolon, (2026/08/04 09:07UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 17.16 51 Menkar 03:02:16.8 +04:05:21 2.5 15.95 29 PPM 175430 04:02:37.0 -00:16:15 5.6 1.53 45 PPM 147207 04:06:41.6 +01:41:00 8.3 0.69 45 PPM 147183 04:04:36.4 +01:18:51 9.8 0.22 45 PPM 147198 04:05:42.8 +01:07:43 10.7 0.17 45 7815_Dolon 04:05:03.1 +01:07:44 15.9 45 Positions are for J2000