Occultation event with (4946) Askalaphus, event index number 876
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/04/02 04:17:59 UTC
J2000 position of star is 08:08:15.9 +42:07:48
Equinox of date position of star is 08:09:59.3 +42:03:18
Star is 51 degrees from the moon. Moon is 19% illuminated.
Stellar brightness G=14.6, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
Expected flux drop is 22% with SNR of 9.8 per integration
Apparent velocity is 9.3 km/sec on the sky relative to the star, or, 8.9 arcsec/hr.
The recommended exposure time corresponds to 5.1 km per image.
The 1-sigma error in the time of the event is 3.9 seconds.
The 1-sigma cross-track error in the shadow position is 50.9 km.
The sky-plane scale is 3777.8 km/arcsec.
Diameter estimates:
54.7 km assuming a 5% albedo, aximum of 5.9 sec for a central chord
22.3 km assuming a 30% albedo, maximum of 2.4 sec for a central chord
Cross-track diameter of 54.7 km used for deployment plan.
Star training set for 4946_Askalaphus, (2025/04/02 04:18UT) Object RA Dec mag sep mel Pollux 07:46:51.5 +27:57:47 1.1 14.86 48 28 Lyn 08:08:54.5 +43:11:08 6.4 1.15 51 PPM 050378 08:11:06.7 +42:21:16 7.2 0.36 52 PPM 050373 08:10:41.9 +42:15:23 9.9 0.24 51 PPM 050361 08:09:51.2 +42:02:37 11.4 0.03 51 4946_Askalaphu 08:09:59.3 +42:03:18 16.0 52 Positions are for equinox of date
Star training set for 4946_Askalaphus, (2025/04/02 04:18UT) Object RA Dec mag sep mel Pollux 07:45:17.8 +28:01:33 1.1 14.86 48 28 Lyn 08:07:09.9 +43:15:36 6.4 1.15 51 PPM 050378 08:09:23.1 +42:25:49 7.2 0.36 52 PPM 050373 08:08:58.3 +42:19:55 9.9 0.24 51 PPM 050361 08:08:07.8 +42:07:07 11.4 0.03 51 4946_Askalaphu 08:08:15.9 +42:07:48 16.0 51 Positions are for J2000