RECON: TNO occultation with 50000

Event between (50000) Quaoar and star UC4-373-113186 with event index number of 149091

Geocentric closest approach at 2018/08/16 01:33:01 UTC

J2000 position of star is 17:59:33.2 -15:24:36
Equinox of date position of star is 18:00:33.7 -15:24:36
Stellar brightness R=16.0, use SENSEUP=128
Star is 64 degrees from the moon. Moon is 27% illuminated.
TNO apparent brightness V=18.8

TNO is 42.9 AU from the Sun and 42.3 AU from the Earth.
The TNO is moving 13.2 km/sec on the sky relative to the star, or, 1.6 arcsec/hr.
The 1-sigma error in the time of the event is 179 seconds.
The 1-sigma cross-track error in the shadow position is 1591 km.

The TNO has an absolute magnitude Hv=2.4
Diameter=1995.3 km assuming a 5% albedo -- 150.6 sec chord
Diameter=814.6 km assuming a 30% albedo -- 61.5 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 50000, (2018/08/16 01:33UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:33.1 -26:28:18  0.9 23.70  45
35Eta Oph      17:11:26.8 -15:44:48  2.6 11.85  52
PPM 233766     17:57:23.4 -15:48:51  6.1  0.88  63
PPM 233865     18:00:35.3 -15:09:02  7.9  0.26  64
50000          18:00:37.3 -15:24:36 16.0        64
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, (2018/08/16 01:33UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 23.70  45
35Eta Oph      17:10:22.7 -15:43:29  2.6 11.85  52
PPM 233766     17:56:19.0 -15:48:46  6.1  0.88  63
PPM 233865     17:59:31.3 -15:09:02  7.9  0.26  64
50000          17:59:33.2 -15:24:36 16.0        64
Positions are for J2000

Event circumstances last updated at 2017/08/02 16:55:48 UT

Marc W. Buie, Southwest Research Institute

RECON