RECON: TNO occultation with 10TH

Event between 10TH and star GA0980:01504822 with event index number of 2427019

Geocentric closest approach at 2021/12/08 23:26:54 UTC

J2000 position of star is 06:15:08.8 +08:16:27
Equinox of date position of star is 06:16:20.4 +08:15:56
Stellar brightness G=16.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 129 degrees from the moon. Moon is 28% illuminated.
TNO apparent brightness V=22.2

TNO is 19.4 AU from the Sun and 18.5 AU from the Earth.
The TNO is moving 23.2 km/sec on the sky relative to the star, or, 6.2 arcsec/hr.
The 1-sigma error in the time of the event is 59 seconds.
The 1-sigma cross-track error in the shadow position is 830 km.

The TNO has an absolute magnitude Hv=9.3
Diameter=83.2 km assuming a 5% albedo -- 3.6 sec chord
Diameter=34.0 km assuming a 30% albedo -- 1.5 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 10TH, (2021/12/08 23:27UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:21.6 +07:24:34  0.4  5.02 124
Alhena         06:38:58.7 +16:22:43  1.9  9.81 136
PPM 150217     06:18:09.5 +07:02:35  6.4  1.30 129
PPM 150157     06:16:23.9 +08:26:16  8.4  0.17 129
PPM 150143     06:15:49.0 +08:17:28  9.9  0.13 129
10TH           06:16:20.5 +08:15:56 16.9       129
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 10TH, (2021/12/08 23:27UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  5.02 124
Alhena         06:37:42.8 +16:23:57  1.9  9.81 136
PPM 150217     06:16:58.4 +07:03:08  6.4  1.30 129
PPM 150157     06:15:12.1 +08:26:47  8.4  0.17 129
PPM 150143     06:14:37.3 +08:17:57  9.9  0.13 129
10TH           06:15:08.8 +08:16:27 16.9       129
Positions are for J2000

Event circumstances last updated at 2021/12/04 02:01:15 UT

Marc W. Buie, Southwest Research Institute

RECON