RECON: TNO occultation with 13GZ137

Event between 13GZ137 and star UC4-393-060478 with event index number of 192449

Geocentric closest approach at 2019/05/19 21:04:15 UTC

J2000 position of star is 14:53:16.3 -11:26:59
Equinox of date position of star is 14:54:14.7 -11:31:20
Stellar brightness R=12.0, use SENSEUP=16
Star is 27 degrees from the moon. Moon is 99% illuminated.
TNO apparent brightness V=23.9

TNO is 41.2 AU from the Sun and 40.2 AU from the Earth.
The TNO is moving 24.3 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 688 seconds.
The 1-sigma cross-track error in the shadow position is 3322 km.

The TNO has an absolute magnitude Hv=7.8
Diameter=165.2 km assuming a 5% albedo -- 6.8 sec chord
Diameter=67.4 km assuming a 30% albedo -- 2.8 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 13GZ137, (2019/05/19 21:04UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:13.0 -11:15:43  1.0 21.59  47
27Bet Lib      15:18:03.2 -09:27:12  2.6  6.19  22
13Xi 1Lib      14:55:26.2 -11:58:35  5.9  0.52  26
PPM 229424     14:53:24.3 -11:33:06  8.2  0.23  27
PPM 229448     14:54:36.9 -11:21:37  9.8  0.18  27
13GZ137        14:54:19.5 -11:31:41 12.0        26
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 13GZ137, (2019/05/19 21:04UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 21.59  47
27Bet Lib      15:17:00.3 -09:22:59  2.6  6.19  22
13Xi 1Lib      14:54:22.8 -11:53:54  5.9  0.52  26
PPM 229424     14:52:21.1 -11:28:23  8.2  0.23  27
PPM 229448     14:53:33.7 -11:16:55  9.8  0.18  27
13GZ137        14:53:16.3 -11:26:59 12.0        27
Positions are for J2000

Event circumstances last updated at 2017/12/06 18:57:34 UT

Marc W. Buie, Southwest Research Institute

RECON