RECON: TNO occultation with 471325

Event between (471325) 11KT19 and star UC4-471-053261 with event index number of 144831

Geocentric closest approach at 2018/05/24 03:19:56 UTC

J2000 position of star is 15:51:19.9 +04:08:10
Equinox of date position of star is 15:52:13.6 +04:04:59
Stellar brightness R=16.0, use SENSEUP=128
Star is 58 degrees from the moon. Moon is 71% illuminated.
TNO apparent brightness V=21.6

TNO is 27.4 AU from the Sun and 26.5 AU from the Earth.
The TNO is moving 31.7 km/sec on the sky relative to the star, or, 5.9 arcsec/hr.
The 1-sigma error in the time of the event is 36 seconds.
The 1-sigma cross-track error in the shadow position is 1864 km.

The TNO has an absolute magnitude Hv=7.2
Diameter=218.8 km assuming a 5% albedo -- 6.9 sec chord
Diameter=89.3 km assuming a 30% albedo -- 2.8 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 471325, (2018/05/24 03:20UT)
Object            RA         Dec     mag  sep  mel
Arcturus       14:16:30.1 +19:05:15  0.0 27.77  36
Unukalhai      15:45:10.5 +06:22:08  2.6  2.89  56
37Eps Ser      15:51:44.1 +04:25:25  3.7  0.37  58
PPM 161919     15:48:43.3 +04:14:34  8.1  0.89  57
PPM 161995     15:53:07.9 +03:56:11  9.4  0.26  58
PPM 161985     15:52:39.8 +03:56:19 10.1  0.18  58
471325         15:52:15.0 +04:04:54 16.0        58
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 471325, (2018/05/24 03:20UT)
Object            RA         Dec     mag  sep  mel
Arcturus       14:15:38.3 +19:10:21  0.0 27.77  36
Unukalhai      15:44:16.3 +06:25:33  2.6  2.89  56
37Eps Ser      15:50:49.1 +04:28:41  3.7  0.37  58
PPM 161919     15:47:48.3 +04:17:54  8.1  0.89  57
PPM 161995     15:52:12.8 +03:59:25  9.4  0.26  58
PPM 161985     15:51:44.7 +03:59:34 10.1  0.18  58
471325         15:51:19.9 +04:08:10 16.0        58
Positions are for J2000

Event circumstances last updated at 2017/12/02 17:34:12 UT

Marc W. Buie, Southwest Research Institute

RECON