RECON: TNO occultation with 500837

Event between (500837) 13GT137 and star UC4-363-068938 with event index number of 253345

Geocentric closest approach at 2020/03/14 20:04:22 UTC

J2000 position of star is 14:54:20.9 -17:28:25
Equinox of date position of star is 14:55:24.2 -17:32:58
Stellar brightness R=14.9, use SENSEUP=128
Star is 19 degrees from the moon. Moon is 67% illuminated.
TNO apparent brightness V=23.9

TNO is 44.2 AU from the Sun and 43.6 AU from the Earth.
The TNO is moving 13.6 km/sec on the sky relative to the star, or, 1.6 arcsec/hr.
The 1-sigma error in the time of the event is 375 seconds.
The 1-sigma cross-track error in the shadow position is 2993 km.

The TNO has an absolute magnitude Hv=7.4
Diameter=199.5 km assuming a 5% albedo -- 14.6 sec chord
Diameter=81.5 km assuming a 30% albedo -- 6.0 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 500837, (2020/03/14 20:04UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:15.6 -11:15:58  1.0 22.48  42
27Bet Lib      15:18:05.8 -09:27:22  2.6  9.79  17
PPM 229408     14:52:59.6 -18:26:15  6.2  1.06  20
PPM 229513     14:57:27.7 -16:52:54  7.5  0.82  19
PPM 229487     14:56:26.4 -17:31:27  9.7  0.23  19
500837         14:55:28.9 -17:33:18 14.9        19
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 500837, (2020/03/14 20:04UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 22.48  42
27Bet Lib      15:17:00.3 -09:22:59  2.6  9.79  17
PPM 229408     14:51:51.3 -18:21:19  6.2  1.06  20
PPM 229513     14:56:19.8 -16:48:03  7.5  0.82  19
PPM 229487     14:55:18.4 -17:26:35  9.7  0.23  19
500837         14:54:20.9 -17:28:25 14.9        19
Positions are for J2000

Event circumstances last updated at 2018/10/26 20:50:15 UT

Marc W. Buie, Southwest Research Institute

RECON