Occultation event with (6090) Aulis, event index number 935
Regions able to see the event: Europe
Geocentric closest approach at 2025/04/29 20:21:27 UTC
J2000 position of star is 08:33:45.6 +23:29:50
Equinox of date position of star is 08:35:14.9 +23:24:33
Star is 56 degrees from the moon. Moon is 6% illuminated.
Stellar brightness G=14.3, apparent brightess of occulting body is G=15.3
Use an exposure time of 0.40 seconds with the standard RECON-QHY system.
SNR of 9.5 per integration for unocculted signal
Expected flux drop is 70% with SNR of 6.7 for the occulted depth (per occulted point)
Apparent velocity is 15.5 km/sec on the sky relative to the star, or, 14.6 arcsec/hr.
Position angle of asteroid motion is 327.7 degrees
The recommended exposure time corresponds to 6.2 km per image.
The 1-sigma error in the time of the event is 1.9 seconds.
The 1-sigma cross-track error in the shadow position is 24.6 km.
The sky-plane scale is 3819.2 km/arcsec.
Diameter estimates:
74.1 km assuming a 5% albedo, aximum of 4.8 sec for a central chord
30.3 km assuming a 30% albedo, maximum of 2.0 sec for a central chord
Cross-track diameter of 74.1 km used for deployment plan.
Star training set for 6090_Aulis, (2025/04/29 20:21UT) Object RA Dec mag sep mel Pollux 07:46:51.7 +27:57:46 1.1 11.81 44 30Ups1Cnc 08:33:00.1 +23:59:38 5.8 0.78 55 32Ups2Cnc 08:34:29.7 +23:59:49 7.5 0.61 56 PPM 098790 08:33:53.7 +23:39:31 9.0 0.40 56 PPM 098818 08:35:42.5 +23:36:54 10.8 0.23 56 6090_Aulis 08:35:14.9 +23:24:33 15.3 56 Positions are for equinox of date
Star training set for 6090_Aulis, (2025/04/29 20:21UT) Object RA Dec mag sep mel Pollux 07:45:17.8 +28:01:33 1.1 11.81 44 30Ups1Cnc 08:31:30.4 +24:04:51 5.8 0.78 55 32Ups2Cnc 08:32:59.9 +24:05:04 7.5 0.61 56 PPM 098790 08:32:24.1 +23:44:46 9.0 0.40 56 PPM 098818 08:34:13.0 +23:42:12 10.8 0.23 56 6090_Aulis 08:33:45.6 +23:29:50 15.3 56 Positions are for J2000