RECON: TNO occultation with 01XU254

Event between 01XU254 and star GA1080:03169085 with event index number of 1031643

Geocentric closest approach at 2021/01/09 16:10:16 UTC

J2000 position of star is 09:00:13.6 +19:02:15
Equinox of date position of star is 09:01:24.9 +18:57:16
Stellar brightness G=14.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 111 degrees from the moon. Moon is 16% illuminated.
TNO apparent brightness V=22.9

TNO is 41.4 AU from the Sun and 40.5 AU from the Earth.
The TNO is moving 23.2 km/sec on the sky relative to the star, or, 2.9 arcsec/hr.
The 1-sigma error in the time of the event is 63 seconds.
The 1-sigma cross-track error in the shadow position is 1467 km.

The TNO has an absolute magnitude Hv=6.7
Diameter=280.6 km assuming a 5% albedo -- 12.1 sec chord
Diameter=114.5 km assuming a 30% albedo -- 4.9 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 01XU254, (2021/01/09 16:10UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:29.4 +11:51:49  1.3 17.86  93
PPM 125810     08:51:56.7 +18:45:09  6.2  2.25 113
PPM 125963     08:59:06.7 +19:12:08  8.3  0.60 111
PPM 126000     09:01:28.3 +18:50:54  9.8  0.11 111
01XU254        09:01:25.1 +18:57:16 14.6       111
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 01XU254, (2021/01/09 16:10UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:22.0 +11:58:02  1.3 17.86  93
PPM 125810     08:50:45.0 +18:49:55  6.2  2.25 113
PPM 125963     08:57:55.1 +19:17:04  8.3  0.60 111
PPM 126000     09:00:16.9 +18:55:53  9.8  0.11 111
01XU254        09:00:13.6 +19:02:15 14.6       111
Positions are for J2000

Event circumstances last updated at 2020/12/14 19:18:57 UT

Marc W. Buie, Southwest Research Institute

RECON