Occultation event with (4063) Euforbo, event index number 1680
Regions able to see the event: SMexico
Geocentric closest approach at 2025/12/14 10:12:00 UTC
J2000 position of star is 13:20:36.9 +09:55:22
Equinox of date position of star is 13:21:54.6 +09:47:14
Star is 21 degrees from the moon. Moon is 26% illuminated.
Stellar brightness G=15.3, apparent brightess of occulting body is G=14.6
Use an exposure time of 0.95 seconds with the standard RECON-QHY system.
SNR of 7.2 per integration for unocculted signal
Expected flux drop is 34% with SNR of 2.5 for the occulted depth (per occulted point)
Apparent velocity is 25.1 km/sec on the sky relative to the star, or, 22.1 arcsec/hr.
Position angle of asteroid motion is 92.2 degrees
The recommended exposure time corresponds to 23.9 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 39.2 km.
The sky-plane scale is 4096.0 km/arcsec.
Diameter estimates:
109.2 km assuming a 5% albedo, aximum of 4.3 sec for a central chord
44.6 km assuming a 30% albedo, maximum of 1.8 sec for a central chord
Cross-track diameter of 95.6 km used for deployment plan.
Star training set for 4063_Euforbo, (2025/12/14 10:12UT) Object RA Dec mag sep mel Arcturus 14:16:50.8 +19:02:55 0.0 16.19 34 Vindemiatrix 13:03:28.1 +10:49:13 2.8 4.65 22 59 Vir 13:18:03.8 +09:17:21 5.7 1.07 21 PPM 159664 13:20:56.8 +09:33:24 8.1 0.33 21 PPM 159672 13:21:23.5 +09:51:51 9.6 0.15 21 PPM 129750 13:22:01.9 +09:54:11 10.3 0.12 21 4063_Euforbo 13:21:54.6 +09:47:14 14.6 21 Positions are for equinox of date
Star training set for 4063_Euforbo, (2025/12/14 10:12UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 16.19 34 Vindemiatrix 13:02:10.1 +10:57:33 2.8 4.65 22 59 Vir 13:16:45.9 +09:25:31 5.7 1.07 21 PPM 159664 13:19:39.0 +09:41:33 8.1 0.33 21 PPM 159672 13:20:05.8 +09:59:59 9.6 0.15 21 PPM 129750 13:20:44.2 +10:02:19 10.3 0.12 21 4063_Euforbo 13:20:36.9 +09:55:22 14.6 21 Positions are for J2000