Occultation event with (4007) Euryalos, event index number 3599
Regions able to see the event: Australia
Geocentric closest approach at 2026/04/08 14:30:32 UTC
J2000 position of star is 12:30:03.2 -04:11:51
Equinox of date position of star is 12:31:24.4 -04:20:33
Star is 83 degrees from the moon. Moon is 65% illuminated.
Stellar brightness G=12.3, apparent brightess of occulting body is G=15.1
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 17.4 per integration for unocculted signal
Expected flux drop is 93% with SNR of 16.1 for the occulted depth (per occulted point)
Apparent velocity is 16.9 km/sec on the sky relative to the star, or, 19.7 arcsec/hr.
Position angle of asteroid motion is 105.1 degrees
The recommended exposure time corresponds to 2.0 km per image.
The 1-sigma error in the time of the event is 1.7 seconds.
The 1-sigma cross-track error in the shadow position is 24.0 km.
The sky-plane scale is 3091.6 km/arcsec.
Diameter estimates:
51.8 km assuming a 5% albedo, maximum of 3.1 sec for a central chord
21.1 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 45.5 km used for deployment plan.
Star training set for 4007_Euryalos, (2026/04/08 14:31UT) Object RA Dec mag sep mel Spica 13:26:34.8 -11:17:51 1.0 15.33 67 4Gam Crv 12:17:09.7 -17:41:15 2.6 13.79 80 PPM 195518 12:29:12.6 -04:45:37 6.2 0.69 83 PPM 195541 12:30:31.0 -04:15:18 8.5 0.24 83 4007_Euryalos 12:31:24.4 -04:20:33 15.1 82 Positions are for equinox of date
Star training set for 4007_Euryalos, (2026/04/08 14:31UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 15.33 67 4Gam Crv 12:15:48.1 -17:32:30 2.6 13.79 80 PPM 195518 12:27:51.4 -04:36:55 6.2 0.69 83 PPM 195541 12:29:09.9 -04:06:36 8.5 0.24 83 4007_Euryalos 12:30:03.2 -04:11:51 15.1 83 Positions are for J2000