RECON observing guide for 4035_Thestor_20250510104953

Occultation event with (4035) Thestor, event index number 964
Regions able to see the event: Australia

Geocentric closest approach at 2025/05/10 10:49:53 UTC

J2000 position of star is 08:41:04.1 +05:52:02
Equinox of date position of star is 08:42:24.7 +05:46:32
Star is 74 degrees from the moon. Moon is 95% illuminated.
Stellar brightness G=14.3, apparent brightess of occulting body is G=15.2
Use an exposure time of 0.40 seconds with the standard RECON-QHY system.
SNR of 9.8 per integration for unocculted signal
Expected flux drop is 70% with SNR of 6.9 for the occulted depth (per occulted point)

Apparent velocity is 18.0 km/sec on the sky relative to the star, or, 17.2 arcsec/hr.
The recommended exposure time corresponds to 7.2 km per image.
The 1-sigma error in the time of the event is 2.6 seconds.
The 1-sigma cross-track error in the shadow position is 15.6 km.
The sky-plane scale is 3774.5 km/arcsec.

Diameter estimates:
73.8 km assuming a 5% albedo, aximum of 4.1 sec for a central chord
30.1 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 73.8 km used for deployment plan.

Star training set for 4035_Thestor, (2025/05/10 10:50UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:43.2 +11:50:32  1.3 22.39  56
Alphard        09:28:50.0 -08:46:11  2.0 18.59  60
4Del Hya       08:38:59.8 +05:36:49  4.2  0.86  75
PPM 154823     08:41:34.2 +06:28:29  7.7  0.73  75
PPM 154869     08:43:35.4 +05:46:49  9.8  0.29  74
PPM 154859     08:42:56.1 +05:42:39 10.6  0.15  74
4035_Thestor   08:42:24.7 +05:46:32 15.2        74
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 4035_Thestor, (2025/05/10 10:50UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3 22.39  56
Alphard        09:27:35.2 -08:39:30  2.0 18.59  60
4Del Hya       08:37:39.3 +05:42:13  4.2  0.86  75
PPM 154823     08:40:13.3 +06:33:58  7.7  0.73  75
PPM 154869     08:42:14.8 +05:52:20  9.8  0.29  74
PPM 154859     08:41:35.5 +05:48:09 10.6  0.15  74
4035_Thestor   08:41:04.1 +05:52:02 15.2        74
Positions are for J2000


Created by recondetail.pro, 2025/03/14 11:12:22 MT