Occultation event with (2260) Neoptolemus, event index number 833
Regions able to see the event: SAfrica
Geocentric closest approach at 2025/03/20 19:45:12 UTC
J2000 position of star is 09:52:34.4 +32:18:42
Equinox of date position of star is 09:54:03.1 +32:11:32
Star is 113 degrees from the moon. Moon is 66% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=14.6
Use an exposure time of 1.85 seconds with the standard RECON-QHY system.
Expected flux drop is 81% with SNR of 5.0 per integration
Apparent velocity is 10.8 km/sec on the sky relative to the star, or, 12.0 arcsec/hr.
The recommended exposure time corresponds to 19.9 km per image.
The 1-sigma error in the time of the event is 4.3 seconds.
The 1-sigma cross-track error in the shadow position is 12.9 km.
The sky-plane scale is 3237.4 km/arcsec.
Diameter estimates:
79.8 km assuming a 5% albedo, aximum of 7.4 sec for a central chord
32.6 km assuming a 30% albedo, maximum of 3.0 sec for a central chord
Cross-track diameter of 79.8 km used for deployment plan.
Star training set for 2260_Neoptolemus, (2025/03/20 19:45UT) Object RA Dec mag sep mel Regulus 10:09:42.7 +11:50:35 1.3 20.67 102 20 LMi 10:02:27.5 +31:47:55 5.4 1.83 111 PPM 074872 09:57:59.7 +32:15:51 7.0 0.84 112 PPM 074841 09:55:51.1 +32:08:10 9.1 0.39 113 2260_Neoptolem 09:54:03.1 +32:11:32 14.6 113 Positions are for equinox of date
Star training set for 2260_Neoptolemus, (2025/03/20 19:45UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 20.67 102 20 LMi 10:00:59.6 +31:55:15 5.4 1.83 111 PPM 074872 09:56:31.2 +32:23:05 7.0 0.84 112 PPM 074841 09:54:22.6 +32:15:23 9.1 0.39 113 2260_Neoptolem 09:52:34.4 +32:18:42 14.6 113 Positions are for J2000