RECON observing guide for 21601_98XO89_20250502231403

Occultation event with (21601) 98XO89, event index number 942
Regions able to see the event: SAmericaN

Geocentric closest approach at 2025/05/02 23:14:03 UTC

J2000 position of star is 10:55:07.9 -17:17:29
Equinox of date position of star is 10:56:22.9 -17:25:36
Star is 64 degrees from the moon. Moon is 33% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=15.3
Use an exposure time of 1.45 seconds with the standard RECON-QHY system.
SNR of 6.6 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 10.3 km/sec on the sky relative to the star, or, 11.4 arcsec/hr.
The recommended exposure time corresponds to 14.9 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 40.6 km.
The sky-plane scale is 3264.6 km/arcsec.

Diameter estimates:
60.0 km assuming a 5% albedo, aximum of 5.8 sec for a central chord
24.5 km assuming a 30% albedo, maximum of 2.4 sec for a central chord
Cross-track diameter of 60.0 km used for deployment plan.

Star training set for 21601_98XO89, (2025/05/02 23:14UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:43.1 +11:50:33  1.3 31.46  37
4Gam Crv       12:17:06.8 -17:40:57  2.6 19.24  79
PPM 223760     11:00:46.2 -16:29:24  5.3  1.41  64
PPM 223690     10:58:00.9 -17:35:20  8.1  0.42  64
PPM 223649     10:56:18.0 -17:17:16  9.6  0.14  63
21601_98XO89   10:56:22.9 -17:25:36 15.3        64
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 21601_98XO89, (2025/05/02 23:14UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3 31.46  37
4Gam Crv       12:15:48.1 -17:32:30  2.6 19.24  79
PPM 223760     10:59:30.8 -16:21:13  5.3  1.41  64
PPM 223690     10:56:45.9 -17:27:11  8.1  0.42  64
PPM 223649     10:55:03.0 -17:09:08  9.6  0.14  63
21601_98XO89   10:55:07.9 -17:17:29 15.3        64
Positions are for J2000


Created by recondetail.pro, 2025/03/14 10:55:13 MT