Occultation event with (4805) Asteropaios, event index number 1399
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/10/22 03:00:43 UTC
J2000 position of star is 01:19:24.9 +23:52:43
Equinox of date position of star is 01:20:49.5 +24:00:49
Star is 167 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=12.3, apparent brightess of occulting body is G=14.5
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 16.9 per integration for unocculted signal
Expected flux drop is 88% with SNR of 14.9 for the occulted depth (per occulted point)
Apparent velocity is 15.7 km/sec on the sky relative to the star, or, 20.7 arcsec/hr.
Position angle of asteroid motion is 62.7 degrees
The recommended exposure time corresponds to 1.9 km per image.
The 1-sigma error in the time of the event is 1.4 seconds.
The 1-sigma cross-track error in the shadow position is 20.6 km.
The sky-plane scale is 2732.0 km/arcsec.
Diameter estimates:
56.8 km assuming a 5% albedo, aximum of 3.6 sec for a central chord
23.2 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 57.6 km used for deployment plan.
Star training set for 4805_Asteropaios, (2025/10/22 03:01UT) Object RA Dec mag sep mel Aldebaran 04:37:24.3 +16:33:33 0.8 46.47 145 6Bet Ari 01:56:04.3 +20:55:59 2.6 8.70 175 PPM 090772 01:27:00.6 +23:38:42 6.5 1.46 168 PPM 090734 01:24:40.3 +24:39:14 8.2 1.09 167 PPM 090671 01:20:11.5 +23:46:52 9.4 0.27 167 4805_Asteropai 01:20:49.5 +24:00:49 14.5 167 Positions are for equinox of date
Star training set for 4805_Asteropaios, (2025/10/22 03:01UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 46.47 145 6Bet Ari 01:54:38.6 +20:48:26 2.6 8.70 175 PPM 090772 01:25:35.7 +23:30:41 6.5 1.46 168 PPM 090734 01:23:15.3 +24:31:11 8.2 1.09 167 PPM 090671 01:18:47.0 +23:38:45 9.4 0.27 167 4805_Asteropai 01:19:24.9 +23:52:43 14.5 167 Positions are for J2000