RECON: TNO occultation with 03WA191

Event between 03WA191 and star GA1080:02169323 with event index number of 1022982

Geocentric closest approach at 2021/01/05 01:01:22 UTC

J2000 position of star is 06:34:29.6 +18:35:38
Equinox of date position of star is 06:35:43.5 +18:34:34
Stellar brightness G=16.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 80 degrees from the moon. Moon is 65% illuminated.
TNO apparent brightness V=23.4

TNO is 32.5 AU from the Sun and 31.5 AU from the Earth.
The TNO is moving 24.5 km/sec on the sky relative to the star, or, 3.9 arcsec/hr.
The 1-sigma error in the time of the event is 527 seconds.
The 1-sigma cross-track error in the shadow position is 1434 km.

The TNO has an absolute magnitude Hv=8.3
Diameter=133.0 km assuming a 5% albedo -- 5.4 sec chord
Diameter=54.3 km assuming a 30% albedo -- 2.2 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 03WA191, (2021/01/05 01:01UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:18.6 +07:24:33  0.4 14.72  90
Alhena         06:38:55.5 +16:22:46  1.9  2.33  79
18Nu Gem       06:30:12.6 +20:11:49  4.1  2.08  81
PPM 122704     06:35:59.6 +18:20:01  8.4  0.25  80
PPM 122687     06:35:31.7 +18:43:22  9.2  0.15  80
PPM 122686     06:35:24.1 +18:33:38 10.4  0.08  80
03WA191        06:35:43.6 +18:34:34 16.4        79
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 03WA191, (2021/01/05 01:01UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 14.72  90
Alhena         06:37:42.8 +16:23:57  1.9  2.33  79
18Nu Gem       06:28:57.8 +20:12:43  4.1  2.08  81
PPM 122704     06:34:45.8 +18:21:06  8.4  0.25  80
PPM 122687     06:34:17.6 +18:44:25  9.2  0.15  80
PPM 122686     06:34:10.1 +18:34:42 10.4  0.08  80
03WA191        06:34:29.6 +18:35:38 16.4        80
Positions are for J2000

Event circumstances last updated at 2021/01/01 22:27:53 UT

Marc W. Buie, Southwest Research Institute

RECON