Occultation event with (4805) Asteropaios, event index number 4487
Regions able to see the event: Europe
Geocentric closest approach at 2026/10/26 00:12:42 UTC
J2000 position of star is 04:32:40.2 +30:18:25
Equinox of date position of star is 04:34:22.1 +30:21:43
Star is 41 degrees from the moon. Moon is 100% illuminated.
Stellar brightness G=16.0, apparent brightess of occulting body is G=15.0
Use an exposure time of 1.40 seconds with the standard RECON-QHY system.
SNR of 5.0 per integration for unocculted signal
Expected flux drop is 27% with SNR of 1.4 for the occulted depth (per occulted point)
Apparent velocity is 10.3 km/sec on the sky relative to the star, or, 12.5 arcsec/hr.
Position angle of asteroid motion is 81.5 degrees
The recommended exposure time corresponds to 14.4 km per image.
The 1-sigma error in the time of the event is 0.3 seconds.
The 1-sigma cross-track error in the shadow position is 31.6 km.
The sky-plane scale is 2956.4 km/arcsec.
Diameter estimates:
56.8 km assuming a 5% albedo, maximum of 5.5 sec for a central chord
23.2 km assuming a 30% albedo, maximum of 2.3 sec for a central chord
Cross-track diameter of 57.6 km used for deployment plan.
Star training set for 4805_Asteropaios, (2026/10/26 00:13UT) Object RA Dec mag sep mel Aldebaran 04:37:27.8 +16:33:40 0.8 13.82 41 3Iot Aur 04:58:44.7 +33:12:21 2.7 5.91 46 PPM 093607 04:36:19.0 +29:00:54 5.7 1.41 41 PPM 069546 04:38:56.6 +30:27:05 8.0 0.99 42 PPM 093576 04:33:17.8 +29:58:57 8.6 0.44 40 PPM 069485 04:34:09.7 +30:34:13 11.5 0.21 41 4805_Asteropai 04:34:22.1 +30:21:43 15.0 41 Positions are for equinox of date
Star training set for 4805_Asteropaios, (2026/10/26 00:13UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 13.82 41 3Iot Aur 04:56:59.6 +33:09:57 2.7 5.91 46 PPM 093607 04:34:38.0 +28:57:40 5.7 1.41 41 PPM 069546 04:37:14.5 +30:23:57 8.0 0.99 42 PPM 093576 04:31:36.2 +29:55:37 8.6 0.44 40 PPM 069485 04:32:27.5 +30:30:54 11.5 0.21 41 4805_Asteropai 04:32:40.2 +30:18:25 15.0 41 Positions are for J2000