RECON: TNO occultation with 523770

Event between (523770) 14XO40 and star GA0740:04949954 with event index number of 1059231

Geocentric closest approach at 2021/03/07 21:51:07 UTC

J2000 position of star is 13:08:14.7 -14:26:25
Equinox of date position of star is 13:09:21.6 -14:33:08
Stellar brightness G=15.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 80 degrees from the moon. Moon is 30% illuminated.
TNO apparent brightness V=20.6

TNO is 17.8 AU from the Sun and 16.9 AU from the Earth.
The TNO is moving 16.7 km/sec on the sky relative to the star, or, 4.9 arcsec/hr.
The 1-sigma error in the time of the event is 68 seconds.
The 1-sigma cross-track error in the shadow position is 798 km.

The TNO has an absolute magnitude Hv=8.0
Diameter=150.7 km assuming a 5% albedo -- 9.0 sec chord
Diameter=61.5 km assuming a 30% albedo -- 3.7 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 523770, (2021/03/07 21:51UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:18.7 -11:16:16  1.0  5.27  77
53 Vir         13:13:11.4 -16:18:44  4.8  1.99  78
PPM 226837     13:09:09.3 -14:24:05  8.3  0.16  80
PPM 226844     13:09:19.1 -14:33:34  9.4  0.01  80
523770         13:09:22.0 -14:33:11 15.8        79
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 523770, (2021/03/07 21:51UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0  5.27  77
53 Vir         13:12:03.7 -16:12:01  4.8  1.99  78
PPM 226837     13:08:02.0 -14:17:19  8.3  0.16  80
PPM 226844     13:08:11.8 -14:26:48  9.4  0.01  80
523770         13:08:14.7 -14:26:25 15.8        80
Positions are for J2000

Event circumstances last updated at 2021/01/19 20:51:56 UT

Marc W. Buie, Southwest Research Institute

RECON