RECON: TNO occultation with 16SK56

Event between 16SK56 and star GA0900:00232489 with event index number of 2708561

Geocentric closest approach at 2022/12/11 18:11:23 UTC

J2000 position of star is 02:47:09.3 +00:57:35
Equinox of date position of star is 02:48:17.1 +01:03:02
Stellar brightness G=14.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 81 degrees from the moon. Moon is 89% illuminated.
TNO apparent brightness V=23.1

TNO is 38.8 AU from the Sun and 38.1 AU from the Earth.
The TNO is moving 18.7 km/sec on the sky relative to the star, or, 2.4 arcsec/hr.
The 1-sigma error in the time of the event is 145 seconds.
The 1-sigma cross-track error in the shadow position is 1488 km.

The TNO has an absolute magnitude Hv=7.1
Diameter=227.0 km assuming a 5% albedo -- 12.3 sec chord
Diameter=92.7 km assuming a 30% albedo -- 5.0 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 16SK56, (2022/12/11 18:13UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:14.4 +16:33:13  0.8 30.97  50
Menkar         03:03:28.9 +04:10:42  2.5  4.91  76
82Del Cet      02:40:39.7 +00:25:35  4.1  2.02  83
PPM 145900     02:48:37.9 +01:09:16  7.9  0.12  81
16SK56         02:48:20.2 +01:03:17 14.6        81
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 16SK56, (2022/12/11 18:13UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 30.97  50
Menkar         03:02:16.8 +04:05:21  2.5  4.91  76
82Del Cet      02:39:29.0 +00:19:42  4.1  2.02  83
PPM 145900     02:47:26.9 +01:03:34  7.9  0.12  81
16SK56         02:47:09.3 +00:57:35 14.6        81
Positions are for J2000

Event circumstances last updated at 2021/12/10 01:37:45 UT

Marc W. Buie, Southwest Research Institute

RECON