Occultation event with (6090) Aulis, event index number 1187
Regions able to see the event: NMexico,SMexico
Geocentric closest approach at 2025/04/12 02:29:36 UTC
J2000 position of star is 08:29:46.7 +24:31:17
Equinox of date position of star is 08:31:16.6 +24:26:07
Star is 69 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=15.5, apparent brightess of occulting body is G=15.1
Use an exposure time of 1.85 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 42% with SNR of 4.2 for the occulted depth (per occulted point)
Apparent velocity is 8.9 km/sec on the sky relative to the star, or, 8.9 arcsec/hr.
The recommended exposure time corresponds to 16.5 km per image.
The 1-sigma error in the time of the event is 3.0 seconds.
The 1-sigma cross-track error in the shadow position is 35.1 km.
The sky-plane scale is 3613.0 km/arcsec.
Diameter estimates:
74.5 km assuming a 5% albedo, aximum of 8.3 sec for a central chord
30.4 km assuming a 30% albedo, maximum of 3.4 sec for a central chord
Cross-track diameter of 74.5 km used for deployment plan.
Star training set for 6090_Aulis, (2025/04/12 02:30UT) Object RA Dec mag sep mel Pollux 07:46:51.5 +27:57:47 1.1 10.56 80 28 Cnc 08:30:06.4 +24:03:33 6.2 0.46 69 PPM 098751 08:31:09.8 +24:15:31 8.1 0.18 69 6090_Aulis 08:31:16.6 +24:26:07 15.1 69 Positions are for equinox of date
Star training set for 6090_Aulis, (2025/04/12 02:30UT) Object RA Dec mag sep mel Pollux 07:45:17.8 +28:01:33 1.1 10.56 80 28 Cnc 08:28:36.7 +24:08:41 6.2 0.46 69 PPM 098751 08:29:40.0 +24:20:40 8.1 0.18 69 6090_Aulis 08:29:46.7 +24:31:17 15.1 69 Positions are for J2000