Occultation event with (2260) Neoptolemus, event index number 1658
Regions able to see the event: UAE
Geocentric closest approach at 2025/12/09 00:55:41 UTC
J2000 position of star is 12:26:48.3 +15:53:40
Equinox of date position of star is 12:28:06.9 +15:45:04
Star is 48 degrees from the moon. Moon is 78% illuminated.
Stellar brightness G=12.0, apparent brightess of occulting body is G=15.2
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 20.7 per integration for unocculted signal
Expected flux drop is 95% with SNR of 19.6 for the occulted depth (per occulted point)
Apparent velocity is 20.8 km/sec on the sky relative to the star, or, 19.0 arcsec/hr.
Position angle of asteroid motion is 90.2 degrees
The recommended exposure time corresponds to 2.5 km per image.
The 1-sigma error in the time of the event is 0.8 seconds.
The 1-sigma cross-track error in the shadow position is 34.7 km.
The sky-plane scale is 3936.5 km/arcsec.
Diameter estimates:
80.2 km assuming a 5% albedo, aximum of 3.9 sec for a central chord
32.7 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 76.4 km used for deployment plan.
Star training set for 2260_Neoptolemus, (2025/12/09 00:56UT) Object RA Dec mag sep mel Arcturus 14:16:50.8 +19:02:55 0.0 26.12 73 Denebola 11:50:22.9 +14:25:37 2.1 9.20 40 11 Com 12:22:01.6 +17:38:59 4.7 2.39 46 PPM 129113 12:32:24.7 +16:28:15 8.4 1.26 49 PPM 129054 12:28:04.1 +15:37:07 9.6 0.13 48 2260_Neoptolem 12:28:06.9 +15:45:04 15.2 48 Positions are for equinox of date
Star training set for 2260_Neoptolemus, (2025/12/09 00:56UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 26.12 73 Denebola 11:49:02.7 +14:34:16 2.1 9.20 40 11 Com 12:20:42.8 +17:47:37 4.7 2.39 46 PPM 129113 12:31:06.4 +16:36:50 8.4 1.26 49 PPM 129054 12:26:45.5 +15:45:43 9.6 0.13 48 2260_Neoptolem 12:26:48.3 +15:53:40 15.2 48 Positions are for J2000