RECON: TNO occultation with 13MR18

Event between 13MR18 and star GA0980:04405128 with event index number of 2068659

Geocentric closest approach at 2021/09/04 14:02:04 UTC

J2000 position of star is 16:31:06.8 +08:59:16
Equinox of date position of star is 16:32:08.8 +08:56:33
Stellar brightness G=13.9, use SENSEUP=64 with the MallinCam and and exposure time of 1 seconds with the QHY174 camera.
Star is 107 degrees from the moon. Moon is 7% illuminated.
TNO apparent brightness V=22.5

TNO is 27.3 AU from the Sun and 27.4 AU from the Earth.
The TNO is moving 17.6 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 62 seconds.
The 1-sigma cross-track error in the shadow position is 1456 km.

The TNO has an absolute magnitude Hv=7.9
Diameter=160.7 km assuming a 5% albedo -- 9.1 sec chord
Diameter=65.6 km assuming a 30% albedo -- 3.7 sec chord
Dynamical classification is 3:2E+6:4II
 
 
 
 
 
 
 
 

Star training set for 13MR18, (2021/09/04 14:02UT)
Object            RA         Dec     mag  sep  mel
Arcturus       14:16:39.1 +19:04:14  0.0 34.32  73
Unukalhai      15:45:20.2 +06:21:32  2.6 11.88  97
29 Her         16:33:37.3 +11:26:34  6.5  2.53 106
PPM 162758     16:32:58.7 +09:22:10  7.3  0.47 107
PPM 162741     16:32:16.3 +08:46:32  9.9  0.17 107
13MR18         16:32:09.2 +08:56:32 13.9       107
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 13MR18, (2021/09/04 14:02UT)
Object            RA         Dec     mag  sep  mel
Arcturus       14:15:38.0 +19:10:14  0.0 34.32  73
Unukalhai      15:44:16.3 +06:25:33  2.6 11.88  97
29 Her         16:32:36.1 +11:29:15  6.5  2.53 106
PPM 162758     16:31:56.5 +09:24:52  7.3  0.47 107
PPM 162741     16:31:13.8 +08:49:15  9.9  0.17 107
13MR18         16:31:06.8 +08:59:16 13.9       107
Positions are for J2000

Event circumstances last updated at 2021/07/25 00:48:56 UT

Marc W. Buie, Southwest Research Institute

RECON