Occultation event with (4063) Euforbo, event index number 3641
Regions able to see the event: US,Europe
Geocentric closest approach at 2026/04/16 00:46:06 UTC
J2000 position of star is 13:18:27.1 +16:16:02
Equinox of date position of star is 13:19:44.5 +16:07:46
Star is 154 degrees from the moon. Moon is 3% illuminated.
Stellar brightness G=11.0, apparent brightess of occulting body is G=13.9
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 36.2 per integration for unocculted signal
Expected flux drop is 94% with SNR of 33.9 for the occulted depth (per occulted point)
Apparent velocity is 16.7 km/sec on the sky relative to the star, or, 18.2 arcsec/hr.
Position angle of asteroid motion is 107.6 degrees
The recommended exposure time corresponds to 2.0 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 34.2 km.
The sky-plane scale is 3300.3 km/arcsec.
Diameter estimates:
109.2 km assuming a 5% albedo, maximum of 6.6 sec for a central chord
44.6 km assuming a 30% albedo, maximum of 2.7 sec for a central chord
Cross-track diameter of 95.6 km used for deployment plan.
Star training set for 4063_Euforbo, (2026/04/16 00:46UT) Object RA Dec mag sep mel Arcturus 14:16:51.7 +19:02:49 0.0 13.92 143 Vindemiatrix 13:03:29.1 +10:49:06 2.8 6.62 161 42Alp Com 13:11:16.1 +17:23:28 4.6 2.39 154 PPM 129759 13:22:57.9 +15:56:39 8.4 0.80 154 PPM 129727 13:19:28.2 +16:08:37 10.7 0.07 154 4063_Euforbo 13:19:44.5 +16:07:46 13.9 154 Positions are for equinox of date
Star training set for 4063_Euforbo, (2026/04/16 00:46UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 13.92 143 Vindemiatrix 13:02:10.1 +10:57:33 2.8 6.62 161 42Alp Com 13:09:58.6 +17:31:50 4.6 2.39 154 PPM 129759 13:21:40.6 +16:04:52 8.4 0.80 154 PPM 129727 13:18:10.8 +16:16:53 10.7 0.07 154 4063_Euforbo 13:18:27.1 +16:16:02 13.9 154 Positions are for J2000