RECON: TNO occultation with 523678

Event between (523678) 13XB26 and star UC4-445-053736 with event index number of 308741

Geocentric closest approach at 2019/05/13 10:33:41 UTC

J2000 position of star is 11:37:38.8 -01:08:30
Equinox of date position of star is 11:38:36.6 -01:14:45
Stellar brightness R=16.5, use SENSEUP=128
Star is 16 degrees from the moon. Moon is 66% illuminated.
TNO apparent brightness V=22.0

TNO is 45.3 AU from the Sun and 44.7 AU from the Earth.
The TNO is moving 12.1 km/sec on the sky relative to the star, or, 1.3 arcsec/hr.
The 1-sigma error in the time of the event is 167 seconds.
The 1-sigma cross-track error in the shadow position is 1802 km.

The TNO has an absolute magnitude Hv=5.3
Diameter=524.8 km assuming a 5% albedo -- 43.5 sec chord
Diameter=214.3 km assuming a 30% albedo -- 17.8 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 523678, (2019/05/13 10:34UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:24.1 +11:52:19  1.3 25.75  11
Denebola       11:50:02.8 +14:27:50  2.1 15.96  14
91Ups Leo      11:37:56.4 -00:55:51  4.3  0.36  16
PPM 178547     11:38:26.5 -01:35:32  7.9  0.35  16
PPM 178544     11:38:16.1 -01:11:25  9.6  0.11  16
523678         11:38:38.3 -01:14:56 16.5        16
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 523678, (2019/05/13 10:34UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:22.0 +11:58:02  1.3 25.75  11
Denebola       11:49:02.9 +14:34:17  2.1 15.96  14
91Ups Leo      11:36:56.9 -00:49:25  4.3  0.36  16
PPM 178547     11:37:27.0 -01:29:06  7.9  0.35  16
PPM 178544     11:37:16.6 -01:04:59  9.6  0.11  16
523678         11:37:38.8 -01:08:30 16.5        16
Positions are for J2000

Event circumstances last updated at 2018/10/24 21:24:51 UT

Marc W. Buie, Southwest Research Institute

RECON