RECON: TNO occultation with 468861

Event between (468861) 13LU28 and star GA1440:04760373 with event index number of 1160427

Geocentric closest approach at 2021/03/23 16:52:33 UTC

J2000 position of star is 13:39:26.6 +55:04:10
Equinox of date position of star is 13:40:14.7 +54:57:45
Stellar brightness G=16.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 68 degrees from the moon. Moon is 70% illuminated.
TNO apparent brightness V=19.1

TNO is 10.9 AU from the Sun and 10.4 AU from the Earth.
The TNO is moving 40.9 km/sec on the sky relative to the star, or, 19.5 arcsec/hr.
The 1-sigma error in the time of the event is 11 seconds.
The 1-sigma cross-track error in the shadow position is 524 km.

The TNO has an absolute magnitude Hv=8.4
Diameter=127.6 km assuming a 5% albedo -- 3.1 sec chord
Diameter=52.1 km assuming a 30% albedo -- 1.3 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 468861, (2021/03/23 16:52UT)
Object            RA         Dec     mag  sep  mel
Vega           18:37:39.5 +38:48:16  0.0 50.67 114
Mizar          13:24:46.6 +54:48:54  2.3  2.23  65
83 UMa         13:41:32.4 +54:34:29  4.7  0.43  68
PPM 034165     13:43:18.1 +55:37:17  7.7  0.79  68
83 UMa         13:41:32.4 +54:34:29  4.7  0.43  68
PPM 034124     13:39:06.5 +54:57:22 10.1  0.16  67
468861         13:40:14.7 +54:57:45 16.0        68
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 468861, (2021/03/23 16:52UT)
Object            RA         Dec     mag  sep  mel
Vega           18:36:56.7 +38:47:07  0.0 50.67 114
Mizar          13:23:55.8 +54:55:31  2.3  2.23  65
83 UMa         13:40:44.2 +54:40:54  4.7  0.43  68
PPM 034165     13:42:30.9 +55:43:40  7.7  0.79  68
83 UMa         13:40:44.2 +54:40:54  4.7  0.43  68
PPM 034124     13:38:18.1 +55:03:49 10.1  0.16  67
468861         13:39:26.6 +55:04:10 16.0        67
Positions are for J2000

Event circumstances last updated at 2021/03/12 00:55:32 UT

Marc W. Buie, Southwest Research Institute

RECON