Occultation event with (2895) Memnon, event index number 1434
Regions able to see the event: SAfrica
Geocentric closest approach at 2025/10/30 21:27:42 UTC
J2000 position of star is 03:08:11.1 -17:16:11
Equinox of date position of star is 03:09:22.7 -17:10:20
Star is 78 degrees from the moon. Moon is 63% illuminated.
Stellar brightness G=12.8, apparent brightess of occulting body is G=14.9
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 12.1 per integration for unocculted signal
Expected flux drop is 87% with SNR of 10.5 for the occulted depth (per occulted point)
Apparent velocity is 16.4 km/sec on the sky relative to the star, or, 19.7 arcsec/hr.
Position angle of asteroid motion is 68.5 degrees
The recommended exposure time corresponds to 2.0 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 22.9 km.
The sky-plane scale is 2992.8 km/arcsec.
Diameter estimates:
58.9 km assuming a 5% albedo, aximum of 3.6 sec for a central chord
24.0 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 56.7 km used for deployment plan.
Star training set for 2895_Memnon, (2025/10/30 21:28UT) Object RA Dec mag sep mel Rigel 05:15:46.8 -08:10:25 0.1 32.06 110 68Omi Cet 02:20:39.2 -02:51:42 2.0 18.65 70 PPM 212547 03:12:28.8 -15:55:44 6.1 1.45 79 PPM 212439 03:07:49.1 -17:22:40 8.5 0.43 77 PPM 212472 03:09:04.9 -17:15:02 9.6 0.11 78 2895_Memnon 03:09:22.7 -17:10:20 14.9 78 Positions are for equinox of date
Star training set for 2895_Memnon, (2025/10/30 21:28UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 32.06 110 68Omi Cet 02:19:20.8 -02:58:46 2.0 18.65 70 PPM 212547 03:11:16.7 -16:01:30 6.1 1.45 79 PPM 212439 03:06:37.6 -17:28:34 8.5 0.43 77 PPM 212472 03:07:53.4 -17:20:54 9.6 0.11 78 2895_Memnon 03:08:11.1 -17:16:11 14.9 78 Positions are for J2000