Occultation event with (7152) Euneus, event index number 1143
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2025/07/15 23:09:20 UTC
J2000 position of star is 10:21:51.3 +12:44:30
Equinox of date position of star is 10:23:12.9 +12:36:44
Star is 156 degrees from the moon. Moon is 73% illuminated.
Stellar brightness G=14.8, apparent brightess of occulting body is G=16.1
Use an exposure time of 0.35 seconds with the standard RECON-QHY system.
SNR of 6.0 per integration for unocculted signal
Expected flux drop is 77% with SNR of 4.6 for the occulted depth (per occulted point)
Apparent velocity is 35.7 km/sec on the sky relative to the star, or, 29.9 arcsec/hr.
Position angle of asteroid motion is 337.8 degrees
The recommended exposure time corresponds to 12.5 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 22.7 km.
The sky-plane scale is 4301.8 km/arcsec.
Diameter estimates:
51.5 km assuming a 5% albedo, aximum of 1.4 sec for a central chord
21.0 km assuming a 30% albedo, maximum of 0.6 sec for a central chord
Cross-track diameter of 51.5 km used for deployment plan.
Star training set for 7152_Euneus, (2025/07/15 23:09UT) Object RA Dec mag sep mel Regulus 10:09:43.8 +11:50:29 1.3 3.38 153 37 Leo 10:18:02.8 +13:36:00 5.4 1.60 154 PPM 127380 10:26:20.1 +12:35:59 8.2 0.76 156 PPM 127340 10:23:24.8 +12:17:54 9.3 0.32 156 7152_Euneus 10:23:12.9 +12:36:44 16.1 156 Positions are for equinox of date
Star training set for 7152_Euneus, (2025/07/15 23:09UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 3.38 153 37 Leo 10:16:40.7 +13:43:41 5.4 1.60 154 PPM 127380 10:24:58.5 +12:43:48 8.2 0.76 156 PPM 127340 10:22:03.2 +12:25:41 9.3 0.32 156 7152_Euneus 10:21:51.3 +12:44:30 16.1 156 Positions are for J2000