Occultation event with (4805) Asteropaios, event index number 1325
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/09/29 23:03:20 UTC
J2000 position of star is 01:31:13.9 +24:56:38
Equinox of date position of star is 01:32:39.3 +25:04:33
Star is 114 degrees from the moon. Moon is 50% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=14.7
Use an exposure time of 1.05 seconds with the standard RECON-QHY system.
SNR of 3.8 per integration for unocculted signal
Expected flux drop is 21% with SNR of 0.8 for the occulted depth (per occulted point)
Apparent velocity is 13.4 km/sec on the sky relative to the star, or, 17.4 arcsec/hr.
Position angle of asteroid motion is 74.8 degrees
The recommended exposure time corresponds to 14.0 km per image.
The 1-sigma error in the time of the event is 1.3 seconds.
The 1-sigma cross-track error in the shadow position is 26.0 km.
The sky-plane scale is 2771.7 km/arcsec.
Diameter estimates:
56.8 km assuming a 5% albedo, aximum of 4.2 sec for a central chord
23.2 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 57.6 km used for deployment plan.
Star training set for 4805_Asteropaios, (2025/09/29 23:03UT) Object RA Dec mag sep mel Aldebaran 04:37:24.1 +16:33:32 0.8 43.79 151 6Bet Ari 01:56:04.1 +20:55:58 2.6 6.79 118 PPM 090772 01:27:00.4 +23:38:41 6.5 1.92 112 PPM 090826 01:30:49.1 +25:24:28 7.1 0.53 114 PPM 090836 01:31:31.7 +25:05:27 9.8 0.26 114 4805_Asteropai 01:32:39.3 +25:04:33 14.7 115 Positions are for equinox of date
Star training set for 4805_Asteropaios, (2025/09/29 23:03UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 43.79 151 6Bet Ari 01:54:38.6 +20:48:26 2.6 6.79 118 PPM 090772 01:25:35.7 +23:30:41 6.5 1.92 112 PPM 090826 01:29:23.7 +25:16:31 7.1 0.53 114 PPM 090836 01:30:06.4 +24:57:31 9.8 0.26 114 4805_Asteropai 01:31:13.9 +24:56:38 14.7 114 Positions are for J2000