Occultation event with (4489) Dracius, event index number 3329
Regions able to see the event: Europe
Geocentric closest approach at 2026/03/02 00:32:44 UTC
J2000 position of star is 10:59:27.9 +34:21:32
Equinox of date position of star is 11:00:54.5 +34:13:06
Star is 26 degrees from the moon. Moon is 97% illuminated.
Stellar brightness G=16.3, apparent brightess of occulting body is G=13.8
Use an exposure time of 1.25 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 10% with SNR of 0.3 for the occulted depth (per occulted point)
Apparent velocity is 16.4 km/sec on the sky relative to the star, or, 19.8 arcsec/hr.
Position angle of asteroid motion is 116.0 degrees
The recommended exposure time corresponds to 20.5 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 29.0 km.
The sky-plane scale is 2969.4 km/arcsec.
Diameter estimates:
93.8 km assuming a 5% albedo, maximum of 5.7 sec for a central chord
38.3 km assuming a 30% albedo, maximum of 2.3 sec for a central chord
Cross-track diameter of 76.6 km used for deployment plan.
Star training set for 4489_Dracius, (2026/03/02 00:33UT) Object RA Dec mag sep mel Regulus 10:09:45.8 +11:50:18 1.3 25.23 7 68Del Leo 11:15:29.8 +20:22:48 2.6 14.21 22 46 UMa 10:57:11.0 +33:22:01 6.2 1.15 24 PPM 075550 10:56:25.0 +33:53:41 6.9 0.98 25 PPM 075579 10:59:14.7 +34:29:09 9.5 0.44 26 PPM 075610 11:01:54.8 +34:19:28 10.6 0.23 26 4489_Dracius 11:00:54.5 +34:13:06 13.8 26 Positions are for equinox of date
Star training set for 4489_Dracius, (2026/03/02 00:33UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 25.23 7 68Del Leo 11:14:06.8 +20:31:22 2.6 14.21 22 46 UMa 10:55:44.2 +33:30:25 6.2 1.15 24 PPM 075550 10:54:58.1 +34:02:05 6.9 0.98 25 PPM 075579 10:57:47.9 +34:37:35 9.5 0.44 26 PPM 075610 11:00:28.3 +34:27:55 10.6 0.23 26 4489_Dracius 10:59:27.9 +34:21:32 13.8 26 Positions are for J2000