Occultation event with (6090) Aulis, event index number 1007
Regions able to see the event: Japan
Geocentric closest approach at 2025/05/27 13:09:50 UTC
J2000 position of star is 08:46:35.4 +21:38:03
Equinox of date position of star is 08:48:03.5 +21:32:23
Star is 56 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=8.5, apparent brightess of occulting body is G=15.4
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 88.4 per integration for unocculted signal
Expected flux drop is 100% with SNR of 88.3 for the occulted depth (per occulted point)
Apparent velocity is 26.3 km/sec on the sky relative to the star, or, 23.0 arcsec/hr.
Position angle of asteroid motion is 337.9 degrees
The recommended exposure time corresponds to 3.2 km per image.
The 1-sigma error in the time of the event is 1.2 seconds.
The 1-sigma cross-track error in the shadow position is 25.2 km.
The sky-plane scale is 4128.0 km/arcsec.
Diameter estimates:
74.1 km assuming a 5% albedo, aximum of 2.8 sec for a central chord
30.3 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 74.1 km used for deployment plan.
Star training set for 6090_Aulis, (2025/05/27 13:10UT) Object RA Dec mag sep mel Pollux 07:46:52.0 +27:57:46 1.1 15.29 41 43Gam Cnc 08:44:45.1 +21:22:32 4.7 0.79 55 PPM 099029 08:47:57.3 +22:15:29 8.5 0.72 55 PPM 099039 08:48:42.6 +21:26:53 9.4 0.18 56 6090_Aulis 08:48:03.5 +21:32:23 15.4 56 Positions are for equinox of date
Star training set for 6090_Aulis, (2025/05/27 13:10UT) Object RA Dec mag sep mel Pollux 07:45:17.8 +28:01:33 1.1 15.29 41 43Gam Cnc 08:43:17.0 +21:28:06 4.7 0.79 55 PPM 099029 08:46:28.8 +22:21:08 8.5 0.72 55 PPM 099039 08:47:14.5 +21:32:34 9.4 0.18 56 6090_Aulis 08:46:35.4 +21:38:03 15.4 56 Positions are for J2000