RECON: TNO occultation with 10RD188

Event between 10RD188 and star GA0740:00128068 with event index number of 2102313

Geocentric closest approach at 2021/10/12 13:22:38 UTC

J2000 position of star is 01:35:09.9 -14:05:25
Equinox of date position of star is 01:36:13.8 -13:58:46
Stellar brightness G=15.1, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 93 degrees from the moon. Moon is 44% illuminated.
TNO apparent brightness V=21.7

TNO is 38.8 AU from the Sun and 37.8 AU from the Earth.
The TNO is moving 25.2 km/sec on the sky relative to the star, or, 3.3 arcsec/hr.
The 1-sigma error in the time of the event is 66 seconds.
The 1-sigma cross-track error in the shadow position is 1596 km.

The TNO has an absolute magnitude Hv=5.8
Diameter=366.5 km assuming a 5% albedo -- 16.4 sec chord
Diameter=149.6 km assuming a 30% albedo -- 6.7 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 10RD188, (2021/10/12 13:22UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:51.0 -29:30:23  1.2 39.46  54
Diphda         00:44:40.9 -17:52:03  2.0 12.98  80
50 Cet         01:37:02.7 -15:17:22  5.4  1.32  93
PPM 210379     01:36:30.8 -13:16:12  7.7  0.71  93
PPM 210384     01:36:34.1 -13:50:04  9.7  0.17  93
10RD188        01:36:13.9 -13:58:46 15.1        93
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 10RD188, (2021/10/12 13:22UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.6 -29:37:24  1.2 39.46  54
Diphda         00:43:35.7 -17:59:11  2.0 12.98  80
50 Cet         01:35:59.0 -15:24:01  5.4  1.32  93
PPM 210379     01:35:26.7 -13:22:51  7.7  0.71  93
PPM 210384     01:35:30.1 -13:56:42  9.7  0.17  93
10RD188        01:35:09.9 -14:05:25 15.1        93
Positions are for J2000

Event circumstances last updated at 2021/10/03 01:33:57 UT

Marc W. Buie, Southwest Research Institute

RECON