RECON observing guide for 9799_Thronium_20250530235813

Occultation event with (9799) Thronium, event index number 1020
Regions able to see the event: SAmericaN

Geocentric closest approach at 2025/05/30 23:58:13 UTC

J2000 position of star is 08:33:18.3 -08:28:08
Equinox of date position of star is 08:34:32.4 -08:33:25
Star is 32 degrees from the moon. Moon is 20% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.95 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 31% with SNR of 1.0 for the occulted depth (per occulted point)

Apparent velocity is 26.0 km/sec on the sky relative to the star, or, 22.7 arcsec/hr.
The recommended exposure time corresponds to 24.7 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 26.0 km.
The sky-plane scale is 4111.6 km/arcsec.

Diameter estimates:
70.8 km assuming a 5% albedo, aximum of 2.7 sec for a central chord
28.9 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 70.8 km used for deployment plan.

Star training set for 9799_Thronium, (2025/05/30 23:58UT)
Object            RA         Dec     mag  sep  mel
Sirius         06:46:16.0 -16:45:09 -1.5 27.62  47
Alphard        09:28:50.2 -08:46:12  2.0 13.42  36
3 Hya          08:36:42.6 -08:04:17  6.2  0.72  32
PPM 191424     08:32:46.5 -08:28:09  8.3  0.45  32
PPM 191469     08:35:15.6 -08:30:36  9.4  0.18  32
9799_Thronium  08:34:32.4 -08:33:25 15.5        32
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 9799_Thronium, (2025/05/30 23:58UT)
Object            RA         Dec     mag  sep  mel
Sirius         06:45:07.9 -16:43:28 -1.5 27.62  47
Alphard        09:27:35.2 -08:39:30  2.0 13.42  36
3 Hya          08:35:28.2 -07:58:56  6.2  0.72  32
PPM 191424     08:31:32.3 -08:22:55  8.3  0.45  32
PPM 191469     08:34:01.4 -08:25:18  9.4  0.18  32
9799_Thronium  08:33:18.3 -08:28:08 15.5        32
Positions are for J2000


Created by recondetail.pro, 2025/03/15 09:13:08 MT