Occultation event with (2895) Memnon, event index number 1243
Regions able to see the event: Europe
Geocentric closest approach at 2025/08/20 01:48:00 UTC
J2000 position of star is 03:19:20.9 -11:13:50
Equinox of date position of star is 03:20:34.5 -11:08:20
Star is 70 degrees from the moon. Moon is 12% illuminated.
Stellar brightness G=15.0, apparent brightess of occulting body is G=15.4
Use an exposure time of 0.90 seconds with the standard RECON-QHY system.
SNR of 9.5 per integration for unocculted signal
Expected flux drop is 59% with SNR of 5.6 for the occulted depth (per occulted point)
Apparent velocity is 15.0 km/sec on the sky relative to the star, or, 15.9 arcsec/hr.
Position angle of asteroid motion is 137.6 degrees
The recommended exposure time corresponds to 13.5 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 25.2 km.
The sky-plane scale is 3403.1 km/arcsec.
Diameter estimates:
58.9 km assuming a 5% albedo, aximum of 3.9 sec for a central chord
24.0 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 56.7 km used for deployment plan.
Star training set for 2895_Memnon, (2025/08/20 01:48UT) Object RA Dec mag sep mel Rigel 05:15:46.3 -08:10:26 0.1 28.53 46 Menkar 03:03:37.4 +04:11:20 2.5 15.90 65 PPM 212940 03:29:14.4 -11:11:57 5.5 2.13 68 PPM 212745 03:20:49.0 -11:19:04 8.2 0.19 70 2895_Memnon 03:20:34.5 -11:08:20 15.4 69 Positions are for equinox of date
Star training set for 2895_Memnon, (2025/08/20 01:48UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 28.53 46 Menkar 03:02:16.8 +04:05:21 2.5 15.90 65 PPM 212940 03:28:01.0 -11:17:13 5.5 2.13 68 PPM 212745 03:19:35.4 -11:24:34 8.2 0.19 70 2895_Memnon 03:19:20.9 -11:13:50 15.4 70 Positions are for J2000