RECON: TNO occultation with 14YA50

Event between 14YA50 and star UC4-548-051470 with event index number of 141797

Geocentric closest approach at 2018/02/14 19:57:55 UTC

J2000 position of star is 12:15:19.1 +19:24:30
Equinox of date position of star is 12:16:12.0 +19:18:42
Stellar brightness R=12.9, use SENSEUP=32
Star is 135 degrees from the moon. Moon is 1% illuminated.
TNO apparent brightness V=21.0

TNO is 42.3 AU from the Sun and 41.5 AU from the Earth.
The TNO is moving 21.8 km/sec on the sky relative to the star, or, 2.6 arcsec/hr.
The 1-sigma error in the time of the event is 211 seconds.
The 1-sigma cross-track error in the shadow position is 4646 km.

The TNO has an absolute magnitude Hv=4.7
Diameter=695.0 km assuming a 5% albedo -- 31.9 sec chord
Diameter=283.8 km assuming a 30% albedo -- 13.0 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 14YA50, (2018/02/14 19:58UT)
Object            RA         Dec     mag  sep  mel
Arcturus       14:16:29.4 +19:05:21  0.0 28.36 107
Denebola       11:49:59.0 +14:28:15  2.1  7.93 141
11 Com         12:21:37.9 +17:41:34  4.7  2.06 134
PPM 128935     12:18:59.2 +18:20:04  8.0  1.17 135
PPM 128891     12:15:49.2 +19:41:23  9.6  0.39 135
PPM 128890     12:15:49.0 +19:08:21 10.1  0.20 135
14YA50         12:16:14.3 +19:18:28 12.9       135
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 14YA50, (2018/02/14 19:58UT)
Object            RA         Dec     mag  sep  mel
Arcturus       14:15:38.3 +19:10:22  0.0 28.36 107
Denebola       11:49:03.0 +14:34:17  2.1  7.93 141
11 Com         12:20:42.9 +17:47:36  4.7  2.06 134
PPM 128935     12:18:04.1 +18:26:06  8.0  1.17 135
PPM 128891     12:14:54.1 +19:47:26  9.6  0.39 135
PPM 128890     12:14:53.9 +19:14:23 10.1  0.20 135
14YA50         12:15:19.1 +19:24:30 12.9       135
Positions are for J2000

Event circumstances last updated at 2017/05/17 18:01:41 UT

Marc W. Buie, Southwest Research Institute

RECON