Occultation event with (624) Hektor, event index number 943
Regions able to see the event: SAmericaS
Geocentric closest approach at 2025/05/03 02:34:33 UTC
J2000 position of star is 09:53:17.0 +15:14:34
Equinox of date position of star is 09:54:39.7 +15:07:21
Star is 30 degrees from the moon. Moon is 35% illuminated.
Stellar brightness G=14.1, apparent brightess of occulting body is G=12.8
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 9.8 per integration for unocculted signal
Expected flux drop is 24% with SNR of 2.4 for the occulted depth (per occulted point)
Apparent velocity is 7.6 km/sec on the sky relative to the star, or, 7.8 arcsec/hr.
Position angle of asteroid motion is 299.1 degrees
The recommended exposure time corresponds to 4.2 km per image.
The 1-sigma error in the time of the event is 3.7 seconds.
The 1-sigma cross-track error in the shadow position is 31.7 km.
The sky-plane scale is 3505.4 km/arcsec.
Diameter estimates:
203.2 km assuming a 5% albedo, aximum of 26.9 sec for a central chord
83.0 km assuming a 30% albedo, maximum of 11.0 sec for a central chord
Cross-track diameter of 203.2 km used for deployment plan.
Star training set for 624_Hektor, (2025/05/03 02:35UT) Object RA Dec mag sep mel Regulus 10:09:43.1 +11:50:33 1.3 4.91 35 16Psi Leo 09:45:06.5 +13:54:17 5.3 2.61 29 PPM 126824 09:50:35.5 +14:50:18 8.0 1.02 29 PPM 126904 09:55:17.4 +15:20:16 9.6 0.26 30 624_Hektor 09:54:39.7 +15:07:21 12.8 31 Positions are for equinox of date
Star training set for 624_Hektor, (2025/05/03 02:35UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 4.91 35 16Psi Leo 09:43:43.9 +14:01:18 5.3 2.61 29 PPM 126824 09:49:12.8 +14:57:26 8.0 1.02 29 PPM 126904 09:53:54.7 +15:27:30 9.6 0.26 30 624_Hektor 09:53:17.0 +15:14:34 12.8 30 Positions are for J2000