Occultation event with (2893) Peiroos, event index number 1531
Regions able to see the event: SAmericaS
Geocentric closest approach at 2025/11/18 03:37:17 UTC
J2000 position of star is 02:36:44.8 -02:12:42
Equinox of date position of star is 02:38:03.5 -02:06:01
Star is 159 degrees from the moon. Moon is 4% illuminated.
Stellar brightness G=12.9, apparent brightess of occulting body is G=14.0
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 11.5 per integration for unocculted signal
Expected flux drop is 75% with SNR of 8.6 for the occulted depth (per occulted point)
Apparent velocity is 16.1 km/sec on the sky relative to the star, or, 18.2 arcsec/hr.
Position angle of asteroid motion is 85.5 degrees
The recommended exposure time corresponds to 1.9 km per image.
The 1-sigma error in the time of the event is 0.9 seconds.
The 1-sigma cross-track error in the shadow position is 29.1 km.
The sky-plane scale is 3180.1 km/arcsec.
Diameter estimates:
95.5 km assuming a 5% albedo, aximum of 6.0 sec for a central chord
39.0 km assuming a 30% albedo, maximum of 2.4 sec for a central chord
Cross-track diameter of 86.9 km used for deployment plan.
Star training set for 2893_Peiroos, (2025/11/18 03:37UT) Object RA Dec mag sep mel Aldebaran 04:37:24.5 +16:33:33 0.8 34.87 142 68Omi Cet 02:20:39.4 -02:51:41 2.0 4.41 160 81 Cet 02:39:00.2 -03:17:08 5.6 1.21 158 PPM 184872 02:40:38.4 -01:57:45 8.2 0.66 159 PPM 184825 02:38:14.0 -01:57:50 9.6 0.14 160 2893_Peiroos 02:38:03.5 -02:06:01 14.0 159 Positions are for equinox of date
Star training set for 2893_Peiroos, (2025/11/18 03:37UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 34.87 142 68Omi Cet 02:19:20.8 -02:58:46 2.0 4.41 160 81 Cet 02:37:41.9 -03:23:48 5.6 1.21 158 PPM 184872 02:39:19.6 -02:04:23 8.2 0.66 159 PPM 184825 02:36:55.2 -02:04:31 9.6 0.14 160 2893_Peiroos 02:36:44.8 -02:12:42 14.0 159 Positions are for J2000