Occultation event with (1749) Telamon, event index number 1079
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/06/20 23:35:15 UTC
J2000 position of star is 10:01:10.2 +12:23:04
Equinox of date position of star is 10:02:32.2 +12:15:40
Star is 119 degrees from the moon. Moon is 26% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=15.0
Use an exposure time of 1.05 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 21% with SNR of 0.6 for the occulted depth (per occulted point)
Apparent velocity is 29.0 km/sec on the sky relative to the star, or, 27.2 arcsec/hr.
Position angle of asteroid motion is 337.3 degrees
The recommended exposure time corresponds to 30.5 km per image.
The 1-sigma error in the time of the event is 1.2 seconds.
The 1-sigma cross-track error in the shadow position is 22.3 km.
The sky-plane scale is 3839.3 km/arcsec.
Diameter estimates:
76.2 km assuming a 5% albedo, aximum of 2.6 sec for a central chord
31.1 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 76.2 km used for deployment plan.
Star training set for 1749_Telamon, (2025/06/20 23:35UT) Object RA Dec mag sep mel Regulus 10:09:43.5 +11:50:30 1.3 1.81 121 27Nu Leo 09:59:35.4 +12:19:20 5.3 0.72 119 PPM 127043 10:03:17.8 +12:07:19 7.9 0.23 120 1749_Telamon 10:02:32.2 +12:15:40 15.0 120 Positions are for equinox of date
Star training set for 1749_Telamon, (2025/06/20 23:35UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 1.81 121 27Nu Leo 09:58:13.3 +12:26:41 5.3 0.72 119 PPM 127043 10:01:55.9 +12:14:44 7.9 0.23 120 1749_Telamon 10:01:10.2 +12:23:04 15.0 119 Positions are for J2000