RECON: TNO occultation with 530930

Event between (530930) 11WG157 and star GA1320:01361719 with event index number of 2443566

Geocentric closest approach at 2021/12/27 17:01:14 UTC

J2000 position of star is 03:43:21.6 +42:15:19
Equinox of date position of star is 03:44:51.2 +42:19:25
Stellar brightness G=16.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 125 degrees from the moon. Moon is 44% illuminated.
TNO apparent brightness V=22.2

TNO is 30.7 AU from the Sun and 29.9 AU from the Earth.
The TNO is moving 21.0 km/sec on the sky relative to the star, or, 3.5 arcsec/hr.
The 1-sigma error in the time of the event is 109 seconds.
The 1-sigma cross-track error in the shadow position is 1863 km.

The TNO has an absolute magnitude Hv=7.3
Diameter=211.8 km assuming a 5% albedo -- 10.1 sec chord
Diameter=86.5 km assuming a 30% albedo -- 4.1 sec chord
Dynamical classification is 1:1
 
 
 
 
 
 
 
 

Star training set for 530930, (2021/12/27 17:01UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:11.1 +16:33:06  0.8 28.10 124
Algol          03:09:36.5 +41:02:20  2.1  6.70 131
41Nu Per       03:46:41.8 +42:38:46  3.8  0.47 125
PPM 046467     03:45:18.5 +42:40:12  8.0  0.36 125
530930         03:44:51.4 +42:19:25 16.4       125
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 530930, (2021/12/27 17:01UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 28.10 124
Algol          03:08:10.1 +40:57:20  2.1  6.70 131
41Nu Per       03:45:11.6 +42:34:43  3.8  0.47 125
PPM 046467     03:43:48.4 +42:36:07  8.0  0.36 125
530930         03:43:21.6 +42:15:19 16.4       125
Positions are for J2000

Event circumstances last updated at 2021/12/06 01:44:54 UT

Marc W. Buie, Southwest Research Institute

RECON