RECON observing guide for 24313_99YR27_20250524163845

Occultation event with (24313) 99YR27, event index number 998
Regions able to see the event: SAfrica

Geocentric closest approach at 2025/05/24 16:38:45 UTC

J2000 position of star is 09:37:51.3 +31:14:39
Equinox of date position of star is 09:39:21.3 +31:07:44
Star is 106 degrees from the moon. Moon is 9% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=16.7
Use an exposure time of 0.80 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 58% with SNR of 1.7 for the occulted depth (per occulted point)

Apparent velocity is 22.6 km/sec on the sky relative to the star, or, 19.9 arcsec/hr.
The recommended exposure time corresponds to 18.1 km per image.
The 1-sigma error in the time of the event is 2.0 seconds.
The 1-sigma cross-track error in the shadow position is 47.7 km.
The sky-plane scale is 4072.1 km/arcsec.

Diameter estimates:
41.5 km assuming a 5% albedo, aximum of 1.8 sec for a central chord
16.9 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 41.5 km used for deployment plan.

Star training set for 24313_99YR27, (2025/05/24 16:39UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:43.3 +11:50:32  1.3 20.52 120
15 Leo         09:45:02.2 +29:51:23  5.6  1.77 107
PPM 074645     09:38:13.0 +31:02:48  7.5  0.26 105
PPM 074650     09:38:43.4 +31:08:04  9.7  0.14 105
24313_99YR27   09:39:21.3 +31:07:44 16.7       106
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 24313_99YR27, (2025/05/24 16:39UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3 20.52 120
15 Leo         09:43:33.2 +29:58:26  5.6  1.77 107
PPM 074645     09:36:43.0 +31:09:42  7.5  0.26 105
PPM 074650     09:37:13.3 +31:14:59  9.7  0.14 105
24313_99YR27   09:37:51.3 +31:14:39 16.7       106
Positions are for J2000


Created by recondetail.pro, 2025/03/15 08:47:53 MT