Occultation event with (4805) Asteropaios, event index number 3201
Regions able to see the event: Europe
Geocentric closest approach at 2026/02/02 21:21:37 UTC
J2000 position of star is 01:22:57.3 +19:35:03
Equinox of date position of star is 01:24:22.0 +19:43:11
Star is 119 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.95 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 31% with SNR of 1.0 for the occulted depth (per occulted point)
Apparent velocity is 23.4 km/sec on the sky relative to the star, or, 23.5 arcsec/hr.
Position angle of asteroid motion is 82.7 degrees
The recommended exposure time corresponds to 22.3 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 27.2 km.
The sky-plane scale is 3595.6 km/arcsec.
Diameter estimates:
56.8 km assuming a 5% albedo, maximum of 2.4 sec for a central chord
23.2 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 57.6 km used for deployment plan.
Star training set for 4805_Asteropaios, (2026/02/02 21:22UT) Object RA Dec mag sep mel Aldebaran 04:37:25.3 +16:33:35 0.8 45.83 77 6Bet Ari 01:56:05.2 +20:56:04 2.6 7.53 112 93Rho Psc 01:27:40.0 +19:18:26 5.6 0.88 119 PPM 117304 01:25:26.8 +19:58:30 8.4 0.36 119 4805_Asteropai 01:24:22.0 +19:43:11 15.5 119 Positions are for equinox of date
Star training set for 4805_Asteropaios, (2026/02/02 21:22UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 45.83 77 6Bet Ari 01:54:38.6 +20:48:26 2.6 7.53 112 93Rho Psc 01:26:15.2 +19:10:21 5.6 0.88 119 PPM 117304 01:24:02.1 +19:50:22 8.4 0.36 119 4805_Asteropai 01:22:57.3 +19:35:03 15.5 119 Positions are for J2000