Occultation event with (4946) Askalaphus, event index number 4668
Regions able to see the event: US
Geocentric closest approach at 2026/11/13 14:03:10 UTC
J2000 position of star is 12:41:01.6 +14:59:55
Equinox of date position of star is 12:42:22.5 +14:51:05
Star is 96 degrees from the moon. Moon is 16% illuminated.
Stellar brightness G=16.0, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 3.1 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 32.9 km/sec on the sky relative to the star, or, 27.8 arcsec/hr.
Position angle of asteroid motion is 107.0 degrees
The recommended exposure time corresponds to 18.1 km per image.
The 1-sigma error in the time of the event is 0.9 seconds.
The 1-sigma cross-track error in the shadow position is 23.1 km.
The sky-plane scale is 4266.8 km/arcsec.
Diameter estimates:
56.0 km assuming a 5% albedo, maximum of 1.7 sec for a central chord
22.9 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 48.2 km used for deployment plan.
Star training set for 4946_Askalaphus, (2026/11/13 14:03UT) Object RA Dec mag sep mel Arcturus 14:16:53.4 +19:02:40 0.0 22.97 79 Vindemiatrix 13:03:30.9 +10:48:55 2.8 6.54 90 29 Com 12:50:14.9 +13:58:35 5.6 2.10 94 PPM 129208 12:39:46.5 +14:43:30 8.4 0.64 97 PPM 129246 12:42:27.5 +15:13:35 8.6 0.38 96 PPM 129247 12:42:31.0 +14:29:11 10.9 0.37 96 4946_Askalaphu 12:42:22.5 +14:51:05 16.0 96 Positions are for equinox of date
Star training set for 4946_Askalaphus, (2026/11/13 14:03UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 22.97 79 Vindemiatrix 13:02:10.1 +10:57:33 2.8 6.54 90 29 Com 12:48:54.3 +14:07:21 5.6 2.10 94 PPM 129208 12:38:25.5 +14:52:21 8.4 0.64 97 PPM 129246 12:41:06.7 +15:22:25 8.6 0.38 96 PPM 129247 12:41:10.1 +14:38:01 10.9 0.37 96 4946_Askalaphu 12:41:01.6 +14:59:55 16.0 96 Positions are for J2000