RECON observing guide for 19725_99WT4_20250620215728

Occultation event with (19725) 99WT4, event index number 1075
Regions able to see the event: SAmericaN

Geocentric closest approach at 2025/06/20 21:57:28 UTC

J2000 position of star is 09:13:57.3 +25:06:49
Equinox of date position of star is 09:15:26.2 +25:00:26
Star is 105 degrees from the moon. Moon is 27% illuminated.
Stellar brightness G=12.2, apparent brightess of occulting body is G=16.4
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 18.7 per integration for unocculted signal
Expected flux drop is 98% with SNR of 18.3 for the occulted depth (per occulted point)

Apparent velocity is 34.8 km/sec on the sky relative to the star, or, 30.9 arcsec/hr.
The recommended exposure time corresponds to 4.2 km per image.
The 1-sigma error in the time of the event is 1.5 seconds.
The 1-sigma cross-track error in the shadow position is 27.3 km.
The sky-plane scale is 4060.8 km/arcsec.

Diameter estimates:
40.7 km assuming a 5% albedo, aximum of 1.2 sec for a central chord
16.6 km assuming a 30% albedo, maximum of 0.5 sec for a central chord
Cross-track diameter of 40.7 km used for deployment plan.

Star training set for 19725_99WT4, (2025/06/20 21:57UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:43.5 +11:50:30  1.3 18.39 122
69Nu Cnc       09:04:13.3 +24:21:03  5.4  2.63 103
PPM 099418     09:15:56.6 +24:54:15  8.0  0.15 105
PPM 099406     09:15:10.8 +25:08:52  9.0  0.15 105
19725_99WT4    09:15:26.2 +25:00:26 16.4       105
Positions are for equinox of date

Azimuth is measured in degrees eastward from north. North is at an azimuth of 0, due East is at an azimuth of 90 degrees, due South is 180, and due West is 270.

Star training set for 19725_99WT4, (2025/06/20 21:57UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3 18.39 122
69Nu Cnc       09:02:44.2 +24:27:10  5.4  2.63 103
PPM 099418     09:14:27.8 +25:00:39  8.0  0.15 105
PPM 099406     09:13:41.9 +25:15:15  9.0  0.15 105
19725_99WT4    09:13:57.3 +25:06:49 16.4       105
Positions are for J2000


Created by recondetail.pro, 2025/03/15 09:48:08 MT