Occultation event with (4805) Asteropaios, event index number 4419
Regions able to see the event: Europe
Geocentric closest approach at 2026/10/17 01:37:35 UTC
J2000 position of star is 04:35:31.6 +30:22:47
Equinox of date position of star is 04:37:13.7 +30:25:58
Star is 155 degrees from the moon. Moon is 35% illuminated.
Stellar brightness G=14.7, apparent brightess of occulting body is G=15.1
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 9.6 per integration for unocculted signal
Expected flux drop is 59% with SNR of 5.6 for the occulted depth (per occulted point)
Apparent velocity is 6.9 km/sec on the sky relative to the star, or, 8.3 arcsec/hr.
Position angle of asteroid motion is 85.8 degrees
The recommended exposure time corresponds to 4.5 km per image.
The 1-sigma error in the time of the event is 0.1 seconds.
The 1-sigma cross-track error in the shadow position is 32.5 km.
The sky-plane scale is 3021.0 km/arcsec.
Diameter estimates:
56.8 km assuming a 5% albedo, maximum of 8.2 sec for a central chord
23.2 km assuming a 30% albedo, maximum of 3.3 sec for a central chord
Cross-track diameter of 57.6 km used for deployment plan.
Star training set for 4805_Asteropaios, (2026/10/17 01:38UT) Object RA Dec mag sep mel Aldebaran 04:37:27.7 +16:33:39 0.8 13.87 152 3Iot Aur 04:58:44.6 +33:12:21 2.7 5.34 160 PPM 093607 04:36:18.9 +29:00:53 5.7 1.43 155 PPM 069546 04:38:56.5 +30:27:05 8.0 0.37 156 PPM 069513 04:36:30.9 +30:40:59 9.7 0.29 155 PPM 069515 04:36:43.0 +30:40:57 10.4 0.27 155 4805_Asteropai 04:37:13.7 +30:25:58 15.1 156 Positions are for equinox of date
Star training set for 4805_Asteropaios, (2026/10/17 01:38UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 13.87 152 3Iot Aur 04:56:59.6 +33:09:57 2.7 5.34 160 PPM 093607 04:34:38.0 +28:57:40 5.7 1.43 155 PPM 069546 04:37:14.5 +30:23:57 8.0 0.37 156 PPM 069513 04:34:48.7 +30:37:46 9.7 0.29 155 PPM 069515 04:35:00.8 +30:37:44 10.4 0.27 155 4805_Asteropai 04:35:31.6 +30:22:47 15.1 155 Positions are for J2000