RECON observing guide for 17365_Thymbraeus_20250712211258

Occultation event with (17365) Thymbraeus, event index number 1132
Regions able to see the event: Australia

Geocentric closest approach at 2025/07/12 21:12:58 UTC

J2000 position of star is 02:24:07.0 +22:15:13
Equinox of date position of star is 02:25:33.8 +22:22:06
Star is 86 degrees from the moon. Moon is 95% illuminated.
Stellar brightness G=15.4, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.45 seconds with the standard RECON-QHY system.
SNR of 4.5 per integration for unocculted signal
Expected flux drop is 64% with SNR of 2.9 for the occulted depth (per occulted point)

Apparent velocity is 23.7 km/sec on the sky relative to the star, or, 22.9 arcsec/hr.
The recommended exposure time corresponds to 10.7 km per image.
The 1-sigma error in the time of the event is 1.9 seconds.
The 1-sigma cross-track error in the shadow position is 16.0 km.
The sky-plane scale is 3723.1 km/arcsec.

Diameter estimates:
47.2 km assuming a 5% albedo, aximum of 2.0 sec for a central chord
19.3 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 47.2 km used for deployment plan.

Star training set for 17365_Thymbraeus, (2025/07/12 21:13UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:23.3 +16:33:31  0.8 31.55 114
Hamal          02:08:37.1 +23:34:55  2.0  4.08  83
22The Ari      02:19:33.1 +20:01:05  5.6  2.74  84
PPM 091645     02:26:06.9 +22:32:54  8.5  0.22  86
17365_Thymbrae 02:25:33.8 +22:22:06 16.0        87
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 17365_Thymbraeus, (2025/07/12 21:13UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.4 +16:30:29  0.8 31.55 114
Hamal          02:07:10.8 +23:27:41  2.0  4.08  83
22The Ari      02:18:07.5 +19:54:04  5.6  2.74  84
PPM 091645     02:24:40.0 +22:26:02  8.5  0.22  86
17365_Thymbrae 02:24:07.0 +22:15:13 16.0        86
Positions are for J2000


Created by recondetail.pro, 2025/02/28 10:57:31 MT