RECON: TNO occultation with 160427

Event between (160427) 05RL43 and star GA0980:00452688 with event index number of 1967029

Geocentric closest approach at 2021/12/07 22:24:18 UTC

J2000 position of star is 04:31:15.0 +09:00:13
Equinox of date position of star is 04:32:26.7 +09:02:58
Stellar brightness G=16.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 119 degrees from the moon. Moon is 18% illuminated.
TNO apparent brightness V=21.8

TNO is 24.6 AU from the Sun and 23.6 AU from the Earth.
The TNO is moving 23.9 km/sec on the sky relative to the star, or, 5.0 arcsec/hr.
The 1-sigma error in the time of the event is 40 seconds.
The 1-sigma cross-track error in the shadow position is 861 km.

The TNO has an absolute magnitude Hv=7.9
Diameter=154.9 km assuming a 5% albedo -- 6.5 sec chord
Diameter=63.2 km assuming a 30% albedo -- 2.6 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 160427, (2021/12/07 22:24UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:10.9 +16:33:06  0.8  7.59 123
Bellatrix      05:26:18.5 +06:22:04  1.6 13.61 130
PPM 147546     04:27:32.6 +08:38:19  6.1  1.28 118
PPM 147680     04:35:00.1 +09:27:29  6.7  0.75 120
PPM 147615     04:31:34.6 +08:58:41 10.0  0.23 119
PPM 147649     04:33:07.0 +08:55:55 10.2  0.20 119
160427         04:32:26.7 +09:02:58 16.7       119
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 160427, (2021/12/07 22:24UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8  7.59 123
Bellatrix      05:25:07.8 +06:20:58  1.6 13.61 130
PPM 147546     04:26:21.1 +08:35:25  6.1  1.28 118
PPM 147680     04:33:48.1 +09:24:49  6.7  0.75 120
PPM 147615     04:30:22.9 +08:55:55 10.0  0.23 119
PPM 147649     04:31:55.3 +08:53:11 10.2  0.20 119
160427         04:31:15.0 +09:00:13 16.7       119
Positions are for J2000

Event circumstances last updated at 2021/12/06 01:43:54 UT

Marc W. Buie, Southwest Research Institute

RECON