Occultation event with (2893) Peiroos, event index number 1378
Regions able to see the event: Europe
Geocentric closest approach at 2025/10/17 05:27:26 UTC
J2000 position of star is 02:52:44.9 -01:16:09
Equinox of date position of star is 02:54:03.7 -01:09:53
Star is 115 degrees from the moon. Moon is 17% illuminated.
Stellar brightness G=15.2, apparent brightess of occulting body is G=14.0
Use an exposure time of 1.30 seconds with the standard RECON-QHY system.
SNR of 8.1 per integration for unocculted signal
Expected flux drop is 24% with SNR of 2.0 for the occulted depth (per occulted point)
Apparent velocity is 16.2 km/sec on the sky relative to the star, or, 18.5 arcsec/hr.
Position angle of asteroid motion is 68.5 degrees
The recommended exposure time corresponds to 21.0 km per image.
The 1-sigma error in the time of the event is 1.5 seconds.
The 1-sigma cross-track error in the shadow position is 23.9 km.
The sky-plane scale is 3154.1 km/arcsec.
Diameter estimates:
95.5 km assuming a 5% albedo, aximum of 5.9 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, (2025/10/17 05:27UT) Object RA Dec mag sep mel Aldebaran 04:37:24.2 +16:33:32 0.8 31.05 86 Menkar 03:03:37.9 +04:11:22 2.5 5.86 111 PPM 185242 03:00:00.2 -02:40:54 5.3 2.12 114 PPM 175206 02:53:30.7 -00:32:46 8.3 0.63 115 PPM 175207 02:54:27.6 -01:09:19 9.7 0.10 115 2893_Peiroos 02:54:03.7 -01:09:53 14.0 114 Positions are for equinox of date
Star training set for 2893_Peiroos, (2025/10/17 05:27UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 31.05 86 Menkar 03:02:16.8 +04:05:21 2.5 5.86 111 PPM 185242 02:58:42.0 -02:47:00 5.3 2.12 114 PPM 175206 02:52:11.7 -00:39:03 8.3 0.63 115 PPM 175207 02:53:08.8 -01:15:34 9.7 0.10 115 2893_Peiroos 02:52:44.9 -01:16:09 14.0 115 Positions are for J2000