RECON: TNO occultation with 250112

Event between (250112) 02KY14 and star GA0920:03095811 with event index number of 2180119

Geocentric closest approach at 2022/10/02 18:14:39 UTC

J2000 position of star is 08:11:44.4 +03:48:22
Equinox of date position of star is 08:12:56.0 +03:44:13
Stellar brightness G=10.7, use SENSEUP=4 with the MallinCam and and exposure time of 125 milli-seconds with the QHY174 camera.
Star is 146 degrees from the moon. Moon is 47% illuminated.
TNO apparent brightness V=21.8

TNO is 14.7 AU from the Sun and 15.1 AU from the Earth.
The TNO is moving 20.6 km/sec on the sky relative to the star, or, 6.8 arcsec/hr.
The 1-sigma error in the time of the event is 82 seconds.
The 1-sigma cross-track error in the shadow position is 1405 km.

The TNO has an absolute magnitude Hv=9.7
Diameter=72.4 km assuming a 5% albedo -- 3.3 sec chord
Diameter=29.6 km assuming a 30% albedo -- 1.3 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 250112, (2022/10/02 18:15UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:42.4 +27:58:10  1.1 25.02 163
Alphard        09:28:42.3 -08:45:30  2.0 22.65 124
PPM 154212     08:18:30.2 +04:08:51  6.5  1.45 145
PPM 153943     08:09:52.5 +02:52:39  8.5  1.15 146
PPM 154022     08:12:30.6 +03:58:23  9.4  0.26 146
PPM 154040     08:12:52.3 +03:41:09 10.2  0.05 146
250112         08:12:56.0 +03:44:13 10.7       146
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 250112, (2022/10/02 18:15UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1 25.02 163
Alphard        09:27:35.2 -08:39:30  2.0 22.65 124
PPM 154212     08:17:18.4 +04:13:09  6.5  1.45 145
PPM 153943     08:08:41.2 +02:56:43  8.5  1.15 146
PPM 154022     08:11:18.8 +04:02:31  9.4  0.26 146
PPM 154040     08:11:40.7 +03:45:17 10.2  0.05 146
250112         08:11:44.4 +03:48:22 10.7       146
Positions are for J2000

Event circumstances last updated at 2022/10/02 04:07:35 UT

Marc W. Buie, Southwest Research Institute

RECON