Occultation event with (6090) Aulis, event index number 3651
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/04/18 05:13:34 UTC
J2000 position of star is 10:13:13.9 +04:58:41
Equinox of date position of star is 10:14:36.1 +04:50:49
Star is 116 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=15.3, apparent brightess of occulting body is G=15.0
Use an exposure time of 1.50 seconds with the standard RECON-QHY system.
SNR of 9.8 per integration for unocculted signal
Expected flux drop is 43% with SNR of 4.2 for the occulted depth (per occulted point)
Apparent velocity is 6.2 km/sec on the sky relative to the star, or, 6.5 arcsec/hr.
Position angle of asteroid motion is 91.7 degrees
The recommended exposure time corresponds to 9.4 km per image.
The 1-sigma error in the time of the event is 4.5 seconds.
The 1-sigma cross-track error in the shadow position is 29.5 km.
The sky-plane scale is 3467.3 km/arcsec.
Diameter estimates:
75.2 km assuming a 5% albedo, maximum of 12.1 sec for a central chord
30.7 km assuming a 30% albedo, maximum of 4.9 sec for a central chord
Cross-track diameter of 59.6 km used for deployment plan.
Star training set for 6090_Aulis, (2026/04/18 05:14UT) Object RA Dec mag sep mel Regulus 10:09:46.2 +11:50:16 1.3 7.09 112 14 Sex 10:08:09.8 +05:28:56 6.2 1.72 114 19 Sex 10:14:10.3 +04:29:01 6.7 0.38 116 PPM 156626 10:14:43.6 +05:08:37 9.6 0.30 115 PPM 156635 10:15:15.3 +04:48:09 10.4 0.17 116 6090_Aulis 10:14:36.1 +04:50:49 15.0 116 Positions are for equinox of date
Star training set for 6090_Aulis, (2026/04/18 05:14UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 7.09 112 14 Sex 10:06:47.4 +05:36:41 6.2 1.72 114 19 Sex 10:12:48.2 +04:36:52 6.7 0.38 116 PPM 156626 10:13:21.3 +05:16:29 9.6 0.30 115 PPM 156635 10:13:53.1 +04:56:02 10.4 0.17 116 6090_Aulis 10:13:13.9 +04:58:41 15.0 116 Positions are for J2000