RECON: TNO occultation with 03QR91

Event between 03QR91 and star UC4-422-136272 with event index number of 207853

Geocentric closest approach at 2019/08/13 16:46:10 UTC

J2000 position of star is 22:32:55.1 -05:40:07
Equinox of date position of star is 22:33:51.1 -05:34:33
Stellar brightness R=16.0, use SENSEUP=128
Star is 37 degrees from the moon. Moon is 97% illuminated.
TNO apparent brightness V=22.4

TNO is 40.4 AU from the Sun and 39.4 AU from the Earth.
The TNO is moving 23.2 km/sec on the sky relative to the star, or, 2.9 arcsec/hr.
The 1-sigma error in the time of the event is 424 seconds.
The 1-sigma cross-track error in the shadow position is 5175 km.

The TNO has an absolute magnitude Hv=6.3
Diameter=325.1 km assuming a 5% albedo -- 14.0 sec chord
Diameter=132.7 km assuming a 30% albedo -- 5.7 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 03QR91, (2019/08/13 16:46UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:43.8 -29:31:04  1.2 24.66  38
Markab         23:05:44.4 +15:18:40  2.5 22.31  56
PPM 206458     22:32:20.0 -06:27:16  6.3  0.97  37
PPM 206483     22:33:38.0 -05:04:18  8.3  0.50  38
PPM 206502     22:34:45.9 -05:36:43  9.7  0.21  38
03QR91         22:33:56.4 -05:34:01 16.0        38
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 03QR91, (2019/08/13 16:46UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.5 -29:37:23  1.2 24.66  38
Markab         23:04:45.7 +15:12:18  2.5 22.31  56
PPM 206458     22:31:18.5 -06:33:20  6.3  0.97  37
PPM 206483     22:32:36.8 -05:10:23  8.3  0.50  38
PPM 206502     22:33:44.6 -05:42:49  9.7  0.21  38
03QR91         22:32:55.1 -05:40:07 16.0        37
Positions are for J2000

Event circumstances last updated at 2017/12/06 19:11:49 UT

Marc W. Buie, Southwest Research Institute

RECON