RECON: TNO occultation with 50000

Event between (50000) Quaoar and star UC4-374-110288 with event index number of 209619

Geocentric closest approach at 2019/08/13 11:15:06 UTC

J2000 position of star is 18:05:07.3 -15:22:16
Equinox of date position of star is 18:06:09.1 -15:22:07
Stellar brightness R=16.4, use SENSEUP=128
Star is 28 degrees from the moon. Moon is 96% illuminated.
TNO apparent brightness V=18.8

TNO is 42.9 AU from the Sun and 42.2 AU from the Earth.
The TNO is moving 14.8 km/sec on the sky relative to the star, or, 1.7 arcsec/hr.
The 1-sigma error in the time of the event is 160 seconds.
The 1-sigma cross-track error in the shadow position is 1649 km.

The TNO has an absolute magnitude Hv=2.4
Diameter=1995.3 km assuming a 5% albedo -- 134.8 sec chord
Diameter=814.6 km assuming a 30% albedo -- 55.0 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 50000, (2019/08/13 11:15UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:36.8 -26:28:26  0.9 24.88  48
35Eta Oph      17:11:30.3 -15:44:52  2.6 13.19  41
PPM 234113     18:10:50.2 -13:55:46  6.4  1.82  27
PPM 234043     18:07:41.7 -14:58:11  8.2  0.53  28
PPM 234025     18:07:11.8 -15:20:15  9.5  0.23  28
50000          18:06:14.9 -15:22:06 16.4        28
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 50000, (2019/08/13 11:15UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 24.88  48
35Eta Oph      17:10:22.7 -15:43:29  2.6 13.19  41
PPM 234113     18:09:43.4 -13:56:04  6.4  1.82  27
PPM 234043     18:06:34.3 -14:58:23  8.2  0.53  28
PPM 234025     18:06:04.3 -15:20:27  9.5  0.23  28
50000          18:05:07.3 -15:22:16 16.4        28
Positions are for J2000

Event circumstances last updated at 2017/12/06 19:11:41 UT

Marc W. Buie, Southwest Research Institute

RECON