Occultation event with (4063) Euforbo, event index number 1538
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/11/18 09:33:38 UTC
J2000 position of star is 13:02:56.6 +10:29:48
Equinox of date position of star is 13:04:14.4 +10:21:29
Star is 32 degrees from the moon. Moon is 3% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=14.6
Use an exposure time of 0.70 seconds with the standard RECON-QHY system.
SNR of 6.7 per integration for unocculted signal
Expected flux drop is 38% with SNR of 2.5 for the occulted depth (per occulted point)
Apparent velocity is 33.8 km/sec on the sky relative to the star, or, 28.2 arcsec/hr.
Position angle of asteroid motion is 101.5 degrees
The recommended exposure time corresponds to 23.7 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 36.0 km.
The sky-plane scale is 4322.9 km/arcsec.
Diameter estimates:
109.2 km assuming a 5% albedo, aximum of 3.2 sec for a central chord
44.6 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 95.6 km used for deployment plan.
Star training set for 4063_Euforbo, (2025/11/18 09:34UT) Object RA Dec mag sep mel Arcturus 14:16:50.6 +19:02:56 0.0 19.57 36 Vindemiatrix 13:03:27.9 +10:49:14 2.8 0.50 33 PPM 129623 13:10:30.2 +09:53:06 6.5 1.61 31 PPM 159380 13:01:04.1 +09:23:13 7.5 1.25 32 PPM 129544 13:04:14.2 +10:17:55 9.4 0.06 32 4063_Euforbo 13:04:14.4 +10:21:29 14.6 32 Positions are for equinox of date
Star training set for 4063_Euforbo, (2025/11/18 09:34UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 19.57 36 Vindemiatrix 13:02:10.1 +10:57:33 2.8 0.50 33 PPM 129623 13:09:12.4 +10:01:20 6.5 1.61 31 PPM 159380 12:59:46.1 +09:31:34 7.5 1.25 32 PPM 129544 13:02:56.3 +10:26:14 9.4 0.06 32 4063_Euforbo 13:02:56.6 +10:29:48 14.6 32 Positions are for J2000