RECON: TNO occultation with 523682

Event between (523682) 14CN23 and star GA0540:08838798 with event index number of 1100456

Geocentric closest approach at 2021/05/18 03:45:58 UTC

J2000 position of star is 16:03:27.8 -34:39:13
Equinox of date position of star is 16:04:49.7 -34:42:38
Stellar brightness G=12.1, use SENSEUP=16 with the MallinCam and and exposure time of 250 milli-seconds with the QHY174 camera.
Star is 118 degrees from the moon. Moon is 33% illuminated.
TNO apparent brightness V=21.3

TNO is 18.0 AU from the Sun and 17.0 AU from the Earth.
The TNO is moving 22.8 km/sec on the sky relative to the star, or, 6.6 arcsec/hr.
The 1-sigma error in the time of the event is 107 seconds.
The 1-sigma cross-track error in the shadow position is 1004 km.

The TNO has an absolute magnitude Hv=8.8
Diameter=104.7 km assuming a 5% albedo -- 4.6 sec chord
Diameter=42.8 km assuming a 30% albedo -- 1.9 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 523682, (2021/05/18 03:46UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:43.3 -26:28:39  0.9  9.93 122
Eta Lup        16:01:32.7 -38:27:21  2.8  3.80 118
PPM 294617     16:05:39.9 -33:16:16  6.3  1.45 118
PPM 294593     16:04:36.9 -35:20:44  8.4  0.64 118
PPM 294591     16:04:33.8 -34:46:10  9.1  0.08 118
523682         16:04:50.8 -34:42:40 12.1       118
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 523682, (2021/05/18 03:46UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  9.93 122
Eta Lup        16:00:07.3 -38:23:48  2.8  3.80 118
PPM 294617     16:04:17.8 -33:12:50  6.3  1.45 118
PPM 294593     16:03:13.5 -35:17:16  8.4  0.64 118
PPM 294591     16:03:10.7 -34:42:42  9.1  0.08 118
523682         16:03:27.8 -34:39:13 12.1       118
Positions are for J2000

Event circumstances last updated at 2021/02/06 21:00:19 UT

Marc W. Buie, Southwest Research Institute

RECON