Occultation event with (4805) Asteropaios, event index number 3266
Regions able to see the event: Europe
Geocentric closest approach at 2026/02/18 20:09:46 UTC
J2000 position of star is 01:34:31.2 +20:02:17
Equinox of date position of star is 01:35:56.8 +20:10:16
Star is 43 degrees from the moon. Moon is 2% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 37% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 29.5 km/sec on the sky relative to the star, or, 28.2 arcsec/hr.
Position angle of asteroid motion is 78.9 degrees
The recommended exposure time corresponds to 19.2 km per image.
The 1-sigma error in the time of the event is 0.5 seconds.
The 1-sigma cross-track error in the shadow position is 26.5 km.
The sky-plane scale is 3763.7 km/arcsec.
Diameter estimates:
56.8 km assuming a 5% albedo, maximum of 1.9 sec for a central chord
23.2 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 57.6 km used for deployment plan.
Star training set for 4805_Asteropaios, (2026/02/18 20:10UT) Object RA Dec mag sep mel Aldebaran 04:37:25.4 +16:33:35 0.8 43.08 83 6Bet Ari 01:56:05.4 +20:56:05 2.6 4.78 48 107 Psc 01:43:55.2 +20:23:41 6.0 1.88 45 PPM 090908 01:36:14.8 +20:18:19 7.8 0.15 43 4805_Asteropai 01:35:56.8 +20:10:16 15.6 44 Positions are for equinox of date
Star training set for 4805_Asteropaios, (2026/02/18 20:10UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 43.08 83 6Bet Ari 01:54:38.6 +20:48:26 2.6 4.78 48 107 Psc 01:42:29.2 +20:15:49 6.0 1.88 45 PPM 090908 01:34:49.2 +20:10:20 7.8 0.15 43 4805_Asteropai 01:34:31.2 +20:02:17 15.6 43 Positions are for J2000