RECON: TNO occultation with 91205

Event between (91205) 98US43 and star GA1040:01196336 with event index number of 1117923

Geocentric closest approach at 2021/12/02 15:11:54 UTC

J2000 position of star is 05:50:23.0 +15:54:16
Equinox of date position of star is 05:51:37.8 +15:54:33
Stellar brightness G=11.6, use SENSEUP=8 with the MallinCam and and exposure time of 125 milli-seconds with the QHY174 camera.
Star is 139 degrees from the moon. Moon is 4% illuminated.
TNO apparent brightness V=23.8

TNO is 38.0 AU from the Sun and 37.0 AU from the Earth.
The TNO is moving 24.2 km/sec on the sky relative to the star, or, 3.2 arcsec/hr.
The 1-sigma error in the time of the event is 794 seconds.
The 1-sigma cross-track error in the shadow position is 5378 km.

The TNO has an absolute magnitude Hv=8.0
Diameter=151.4 km assuming a 5% albedo -- 6.3 sec chord
Diameter=61.8 km assuming a 30% albedo -- 2.6 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 91205, (2021/12/02 15:12UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:21.6 +07:24:34  0.4  8.58 136
Alhena         06:38:58.7 +16:22:43  1.9 11.37 128
131 Tau        05:48:28.1 +14:29:41  5.7  1.61 139
PPM 121449     05:51:18.1 +16:01:05  8.3  0.14 139
91205          05:51:38.7 +15:54:33 11.6       139
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 91205, (2021/12/02 15:12UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  8.58 136
Alhena         06:37:42.8 +16:23:57  1.9 11.37 128
131 Tau        05:47:13.1 +14:29:18  5.7  1.61 139
PPM 121449     05:50:02.3 +16:00:47  8.3  0.14 139
91205          05:50:23.0 +15:54:16 11.6       139
Positions are for J2000

Event circumstances last updated at 2021/08/30 01:17:35 UT

Marc W. Buie, Southwest Research Institute

RECON