RECON: TNO occultation with 202421

Event between (202421) 05UQ513 and star UC4-617-002409 with event index number of 154982

Geocentric closest approach at 2018/09/12 13:04:52 UTC

J2000 position of star is 00:50:51.9 +33:21:29
Equinox of date position of star is 00:51:47.7 +33:27:02
Stellar brightness R=12.1, use SENSEUP=16
Star is 149 degrees from the moon. Moon is 10% illuminated.
TNO apparent brightness V=20.3

TNO is 48.1 AU from the Sun and 47.3 AU from the Earth.
The TNO is moving 21.6 km/sec on the sky relative to the star, or, 2.3 arcsec/hr.
The 1-sigma error in the time of the event is 155 seconds.
The 1-sigma cross-track error in the shadow position is 2451 km.

The TNO has an absolute magnitude Hv=3.4
Diameter=1259.0 km assuming a 5% albedo -- 58.2 sec chord
Diameter=514.0 km assuming a 30% albedo -- 23.8 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 202421, (2018/09/12 13:05UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:42:04.2 +45:20:52  1.3 48.44 103
57Gam1And      02:05:03.3 +42:25:07  2.3 16.93 143
69Sig Psc      01:03:50.8 +31:54:15  5.4  2.96 152
PPM 065690     00:52:11.7 +33:39:34  8.2  0.21 149
PPM 065685     00:51:48.9 +33:24:11  9.5  0.06 149
202421         00:51:53.1 +33:27:34 12.1       149
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 202421, (2018/09/12 13:05UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:41:25.9 +45:16:49  1.3 48.44 103
57Gam1And      02:03:54.0 +42:19:46  2.3 16.93 143
69Sig Psc      01:02:49.1 +31:48:15  5.4  2.96 152
PPM 065690     00:51:10.5 +33:33:29  8.2  0.21 149
PPM 065685     00:50:47.8 +33:18:05  9.5  0.06 149
202421         00:50:51.9 +33:21:29 12.1       149
Positions are for J2000

Event circumstances last updated at 2017/01/21 18:05:05 UT

Marc W. Buie, Southwest Research Institute

RECON