RECON observing guide for 8125_Tyndareus_20250711162119

Occultation event with (8125) Tyndareus, event index number 1128
Regions able to see the event: SAfrica

Geocentric closest approach at 2025/07/11 16:21:19 UTC

J2000 position of star is 11:05:58.5 -01:43:34
Equinox of date position of star is 11:07:16.7 -01:51:51
Star is 130 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=13.8, apparent brightess of occulting body is G=16.8
Use an exposure time of 0.20 seconds with the standard RECON-QHY system.
SNR of 8.8 per integration for unocculted signal
Expected flux drop is 94% with SNR of 8.3 for the occulted depth (per occulted point)

Apparent velocity is 27.3 km/sec on the sky relative to the star, or, 23.0 arcsec/hr.
The recommended exposure time corresponds to 5.5 km per image.
The 1-sigma error in the time of the event is 2.1 seconds.
The 1-sigma cross-track error in the shadow position is 44.8 km.
The sky-plane scale is 4265.1 km/arcsec.

Diameter estimates:
40.7 km assuming a 5% albedo, aximum of 1.5 sec for a central chord
16.6 km assuming a 30% albedo, maximum of 0.6 sec for a central chord
Cross-track diameter of 40.7 km used for deployment plan.

Star training set for 8125_Tyndareus, (2025/07/11 16:21UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:43.7 +11:50:29  1.3 19.81 149
Denebola       11:50:21.6 +14:25:45  2.1 19.48 128
PPM 178367     11:04:32.9 -00:53:28  6.2  1.19 131
PPM 178398     11:09:35.2 -02:02:30  7.2  0.60 130
PPM 178380     11:06:23.8 -01:56:20  8.9  0.23 130
8125_Tyndareus 11:07:16.7 -01:51:51 16.8       130
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 8125_Tyndareus, (2025/07/11 16:21UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3 19.81 149
Denebola       11:49:02.7 +14:34:16  2.1 19.48 128
PPM 178367     11:03:14.6 -00:45:12  6.2  1.19 131
PPM 178398     11:08:17.0 -01:54:11  7.2  0.60 130
PPM 178380     11:05:05.6 -01:48:02  8.9  0.23 130
8125_Tyndareus 11:05:58.5 -01:43:34 16.8       130
Positions are for J2000


Created by recondetail.pro, 2025/03/15 10:25:00 MT