RECON: TNO occultation with 99XY143

Event between 99XY143 and star UC4-551-030417 with event index number of 184782

Geocentric closest approach at 2019/03/11 19:02:55 UTC

J2000 position of star is 06:38:59.5 +20:04:23
Equinox of date position of star is 06:40:01.1 +20:03:23
Stellar brightness R=15.1, use SENSEUP=128
Star is 50 degrees from the moon. Moon is 24% illuminated.
TNO apparent brightness V=22.7

TNO is 44.8 AU from the Sun and 44.5 AU from the Earth.
The TNO is moving 5.7 km/sec on the sky relative to the star, or, 0.6 arcsec/hr.
The 1-sigma error in the time of the event is 1731 seconds.
The 1-sigma cross-track error in the shadow position is 5652 km.

The TNO has an absolute magnitude Hv=6.1
Diameter=363.1 km assuming a 5% albedo -- 63.4 sec chord
Diameter=148.2 km assuming a 30% albedo -- 25.9 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 99XY143, (2019/03/11 19:03UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:12.7 +07:24:33  0.4 16.53  41
Alhena         06:38:49.2 +16:22:53  1.9  3.69  50
PPM 096308     06:40:14.5 +22:00:44  6.0  1.96  50
PPM 122791     06:39:15.2 +19:51:33  8.4  0.28  50
99XY143        06:40:07.8 +20:03:17 15.1        50
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 99XY143, (2019/03/11 19:03UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 16.53  41
Alhena         06:37:42.8 +16:23:57  1.9  3.69  50
PPM 096308     06:39:05.3 +22:01:51  6.0  1.96  50
PPM 122791     06:38:07.1 +19:52:38  8.4  0.28  50
99XY143        06:38:59.5 +20:04:23 15.1        50
Positions are for J2000

Event circumstances last updated at 2017/04/24 16:39:46 UT

Marc W. Buie, Southwest Research Institute

RECON