RECON: TNO occultation with 09KN30

Event between 09KN30 and star GA0660:30547688 with event index number of 1088971

Geocentric closest approach at 2021/07/31 19:56:12 UTC

J2000 position of star is 18:30:17.6 -23:49:49
Equinox of date position of star is 18:31:34.7 -23:48:52
Stellar brightness G=15.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 125 degrees from the moon. Moon is 47% illuminated.
TNO apparent brightness V=23.3

TNO is 34.4 AU from the Sun and 33.5 AU from the Earth.
The TNO is moving 18.9 km/sec on the sky relative to the star, or, 2.8 arcsec/hr.
The 1-sigma error in the time of the event is 447 seconds.
The 1-sigma cross-track error in the shadow position is 2153 km.

The TNO has an absolute magnitude Hv=7.9
Diameter=156.3 km assuming a 5% albedo -- 8.3 sec chord
Diameter=63.8 km assuming a 30% albedo -- 3.4 sec chord
Dynamical classification is 7:2EEEEE
 
 
 
 
 
 
 
 

Star training set for 09KN30, (2021/07/31 19:56UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:44.0 -26:28:41  0.9 27.42 151
Nunki          18:56:36.1 -26:16:05  2.0  6.17 119
PPM 268694     18:39:49.4 -23:29:05  6.3  1.91 123
PPM 268515     18:32:39.2 -23:17:56  7.9  0.57 125
PPM 268497     18:31:49.6 -23:44:50  9.2  0.08 125
09KN30         18:31:36.6 -23:48:50 15.8       125
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 09KN30, (2021/07/31 19:56UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 27.42 151
Nunki          18:55:15.9 -26:17:49  2.0  6.17 119
PPM 268694     18:38:30.7 -23:30:18  6.3  1.91 123
PPM 268515     18:31:20.5 -23:18:57  7.9  0.57 125
PPM 268497     18:30:30.7 -23:45:48  9.2  0.08 125
09KN30         18:30:17.6 -23:49:49 15.8       125
Positions are for J2000

Event circumstances last updated at 2021/01/24 20:45:48 UT

Marc W. Buie, Southwest Research Institute

RECON