RECON: TNO occultation with 17OF69

Event between 17OF69 and star GA0840:19296284 with event index number of 2167534

Geocentric closest approach at 2022/07/08 19:49:38 UTC

J2000 position of star is 20:30:54.8 -04:31:40
Equinox of date position of star is 20:32:05.4 -04:27:04
Stellar brightness G=13.4, use SENSEUP=32 with the MallinCam and and exposure time of 500 milli-seconds with the QHY174 camera.
Star is 90 degrees from the moon. Moon is 69% illuminated.
TNO apparent brightness V=20.7

TNO is 43.1 AU from the Sun and 42.2 AU from the Earth.
The TNO is moving 22.9 km/sec on the sky relative to the star, or, 2.7 arcsec/hr.
The 1-sigma error in the time of the event is 76 seconds.
The 1-sigma cross-track error in the shadow position is 1568 km.

The TNO has an absolute magnitude Hv=4.3
Diameter=843.4 km assuming a 5% albedo -- 36.8 sec chord
Diameter=344.3 km assuming a 30% albedo -- 15.0 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 17OF69, (2022/07/08 19:48UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:53.4 -29:30:09  1.2 42.78 114
Tarazed        19:47:19.8 +10:40:10  2.7 18.78  83
69 Aql         20:30:49.5 -02:48:33  4.9  1.67  90
PPM 204120     20:31:12.7 -04:21:42  8.0  0.24  90
PPM 204139     20:32:13.5 -04:37:35  9.1  0.18  90
17OF69         20:32:05.9 -04:27:02 13.4        91
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.

Do not use the listing below for the RECON CPC 1100 telescopes. This is provided for other non-team facilities.

Star training set for 17OF69, (2022/07/08 19:48UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.6 -29:37:24  1.2 42.78 114
Tarazed        19:46:15.6 +10:36:48  2.7 18.78  83
69 Aql         20:29:39.1 -02:53:08  4.9  1.67  90
PPM 204120     20:30:01.7 -04:26:18  8.0  0.24  90
PPM 204139     20:31:02.3 -04:42:12  9.1  0.18  90
17OF69         20:30:54.8 -04:31:40 13.4        90
Positions are for J2000

Event circumstances last updated at 2022/05/13 23:08:56 UT

Marc W. Buie, Southwest Research Institute

RECON