RECON: TNO occultation with 138537

Event between (138537) 00OK67 and star UC4-443-135107 with event index number of 148350

Geocentric closest approach at 2018/08/23 22:37:56 UTC

J2000 position of star is 23:52:29.6 -01:30:43
Equinox of date position of star is 23:53:23.1 -01:24:54
Stellar brightness R=14.8, use SENSEUP=128
Star is 55 degrees from the moon. Moon is 94% illuminated.
TNO apparent brightness V=22.3

TNO is 40.1 AU from the Sun and 39.2 AU from the Earth.
The TNO is moving 21.4 km/sec on the sky relative to the star, or, 2.7 arcsec/hr.
The 1-sigma error in the time of the event is 118 seconds.
The 1-sigma cross-track error in the shadow position is 2041 km.

The TNO has an absolute magnitude Hv=6.2
Diameter=346.7 km assuming a 5% albedo -- 16.2 sec chord
Diameter=141.6 km assuming a 30% albedo -- 6.6 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 138537, (2018/08/23 22:38UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:40.6 -29:31:23  1.2 30.99  37
Algenib        00:14:11.9 +15:17:14  2.8 17.47  67
24 Psc         23:53:53.0 -03:03:07  6.2  1.65  54
PPM 208118     23:55:36.0 -01:50:33  7.6  0.69  55
PPM 181708     23:54:07.7 -01:27:59  9.7  0.18  55
138537         23:53:27.0 -01:24:29 14.8        55
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 138537, (2018/08/23 22:38UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.5 -29:37:23  1.2 30.99  37
Algenib        00:13:14.2 +15:11:01  2.8 17.47  67
24 Psc         23:52:55.7 -03:09:21  6.2  1.65  54
PPM 208118     23:54:38.7 -01:56:47  7.6  0.69  55
PPM 181708     23:53:10.3 -01:34:13  9.7  0.18  55
138537         23:52:29.6 -01:30:43 14.8        55
Positions are for J2000

Event circumstances last updated at 2017/05/19 18:02:13 UT

Marc W. Buie, Southwest Research Institute

RECON