RECON: TNO occultation with 12UE185

Event between 12UE185 and star GA0880:03541654 with event index number of 1699561

Geocentric closest approach at 2021/01/20 22:22:17 UTC

J2000 position of star is 08:36:18.3 -01:59:11
Equinox of date position of star is 08:37:22.1 -02:03:37
Stellar brightness G=15.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 98 degrees from the moon. Moon is 51% illuminated.
TNO apparent brightness V=22.1

TNO is 36.9 AU from the Sun and 36.0 AU from the Earth.
The TNO is moving 24.6 km/sec on the sky relative to the star, or, 3.4 arcsec/hr.
The 1-sigma error in the time of the event is 117 seconds.
The 1-sigma cross-track error in the shadow position is 1648 km.

The TNO has an absolute magnitude Hv=6.4
Diameter=306.2 km assuming a 5% albedo -- 12.6 sec chord
Diameter=125.0 km assuming a 30% albedo -- 5.1 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 12UE185, (2021/01/20 22:22UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:29.5 +11:51:49  1.3 26.79 118
Alphard        09:28:37.3 -08:45:03  2.0 14.40 112
PPM 177501     08:35:05.5 -02:13:29  6.4  0.59  98
PPM 177535     08:39:16.5 -01:56:37  8.5  0.49  99
PPM 177523     08:37:40.6 -02:02:35  9.9  0.08  98
12UE185        08:37:22.2 -02:03:38 15.9        99
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 12UE185, (2021/01/20 22:22UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:22.0 +11:58:02  1.3 26.79 118
Alphard        09:27:35.2 -08:39:30  2.0 14.40 112
PPM 177501     08:34:01.6 -02:09:06  6.4  0.59  98
PPM 177535     08:38:12.4 -01:52:08  8.5  0.49  99
PPM 177523     08:36:36.7 -01:58:08  9.9  0.08  98
12UE185        08:36:18.3 -01:59:11 15.9        98
Positions are for J2000

Event circumstances last updated at 2021/01/01 22:35:43 UT

Marc W. Buie, Southwest Research Institute

RECON