RECON: TNO occultation with 03WA191

Event between 03WA191 and star GA1080:02198624 with event index number of 1022977

Geocentric closest approach at 2020/12/20 20:50:12 UTC

J2000 position of star is 06:36:08.7 +18:34:11
Equinox of date position of star is 06:37:22.3 +18:33:04
Stellar brightness G=16.2, use SENSEUP=128
Star is 111 degrees from the moon. Moon is 39% 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 24.3 km/sec on the sky relative to the star, or, 3.8 arcsec/hr.
The 1-sigma error in the time of the event is 2109 seconds.
The 1-sigma cross-track error in the shadow position is 4066 km.

The TNO has an absolute magnitude Hv=8.3
Diameter=133.0 km assuming a 5% albedo -- 5.5 sec chord
Diameter=54.3 km assuming a 30% albedo -- 2.2 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 03WA191, (2020/12/20 20:50UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:18.5 +07:24:33  0.4 14.96 100
Alhena         06:38:55.4 +16:22:47  1.9  2.20 111
26 Gem         06:43:37.5 +17:37:23  5.3  1.75 113
PPM 122704     06:35:59.5 +18:20:01  8.4  0.39 111
PPM 122752     06:37:28.7 +18:22:27 10.9  0.18 111
03WA191        06:37:22.4 +18:33:04 16.2       111
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, (2020/12/20 20:50UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 14.96 100
Alhena         06:37:42.8 +16:23:57  1.9  2.20 111
26 Gem         06:42:24.3 +17:38:42  5.3  1.75 113
PPM 122704     06:34:45.8 +18:21:06  8.4  0.39 111
PPM 122752     06:36:15.1 +18:23:35 10.9  0.18 111
03WA191        06:36:08.7 +18:34:11 16.2       111
Positions are for J2000

Event circumstances last updated at 2020/12/04 01:23:46 UT

Marc W. Buie, Southwest Research Institute

RECON