RECON: TNO occultation with 11JY31

Event between 11JY31 and star UC4-350-174302 with event index number of 203331

Geocentric closest approach at 2019/05/14 16:54:50 UTC

J2000 position of star is 19:17:04.7 -20:03:39
Equinox of date position of star is 19:18:08.1 -20:01:39
Stellar brightness R=16.4, use SENSEUP=128
Star is 109 degrees from the moon. Moon is 79% illuminated.
TNO apparent brightness V=25.2

TNO is 42.4 AU from the Sun and 41.8 AU from the Earth.
The TNO is moving 12.1 km/sec on the sky relative to the star, or, 1.4 arcsec/hr.
The 1-sigma error in the time of the event is 1811 seconds.
The 1-sigma cross-track error in the shadow position is 1972 km.

The TNO has an absolute magnitude Hv=8.8
Diameter=103.8 km assuming a 5% albedo -- 8.6 sec chord
Diameter=42.4 km assuming a 30% albedo -- 3.5 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 11JY31, (2019/05/14 16:55UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:35.9 -26:28:24  0.9 38.87  71
Nunki          18:56:27.9 -26:16:16  2.0  8.00 104
43 Sgr         19:18:46.0 -18:55:01  4.9  1.12 109
PPM 235722     19:16:34.7 -19:45:07  8.1  0.47 109
PPM 235780     19:19:04.2 -19:50:09  9.3  0.28 109
11JY31         19:18:13.2 -20:01:30 16.4       109
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 11JY31, (2019/05/14 16:55UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 38.87  71
Nunki          18:55:15.9 -26:17:49  2.0  8.00 104
43 Sgr         19:17:38.1 -18:57:11  4.9  1.12 109
PPM 235722     19:15:26.3 -19:47:14  8.1  0.47 109
PPM 235780     19:17:55.8 -19:52:19  9.3  0.28 109
11JY31         19:17:04.7 -20:03:39 16.4       109
Positions are for J2000

Event circumstances last updated at 2017/12/06 18:55:57 UT

Marc W. Buie, Southwest Research Institute

RECON