RECON: TNO occultation with 12XW159

Event between 12XW159 and star GA0940:01285345 with event index number of 2035427

Geocentric closest approach at 2021/11/11 02:10:19 UTC

J2000 position of star is 06:13:59.4 +05:44:02
Equinox of date position of star is 06:15:09.2 +05:43:35
Stellar brightness G=15.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 135 degrees from the moon. Moon is 45% illuminated.
TNO apparent brightness V=22.6

TNO is 32.0 AU from the Sun and 31.3 AU from the Earth.
The TNO is moving 16.8 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 209 seconds.
The 1-sigma cross-track error in the shadow position is 1365 km.

The TNO has an absolute magnitude Hv=7.4
Diameter=204.2 km assuming a 5% albedo -- 11.9 sec chord
Diameter=83.4 km assuming a 30% albedo -- 4.9 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 12XW159, (2021/11/11 02:10UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:21.4 +07:24:34  0.4  4.96 131
34Del Ori      05:33:07.5 -00:17:05  2.2 12.09 123
PPM 150179     06:16:50.5 +06:03:26  5.8  0.53 135
PPM 150195     06:17:23.7 +05:06:19  6.9  0.83 135
PPM 150107     06:14:30.7 +05:29:31  8.9  0.28 135
PPM 150132     06:15:27.8 +05:50:33 10.4  0.14 135
12XW159        06:15:09.5 +05:43:34 15.6       135
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 12XW159, (2021/11/11 02:10UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  4.96 131
34Del Ori      05:32:00.4 -00:17:57  2.2 12.09 123
PPM 150179     06:15:40.2 +06:03:57  5.8  0.53 135
PPM 150195     06:16:13.8 +05:06:51  6.9  0.83 135
PPM 150107     06:13:20.6 +05:29:57  8.9  0.28 135
PPM 150132     06:14:17.6 +05:51:02 10.4  0.14 135
12XW159        06:13:59.4 +05:44:02 15.6       135
Positions are for J2000

Event circumstances last updated at 2021/10/04 01:48:16 UT

Marc W. Buie, Southwest Research Institute

RECON