RECON: TNO occultation with 530839

Event between (530839) 11UK411 and star GA1040:00322932 with event index number of 1599065

Geocentric closest approach at 2021/07/19 12:05:43 UTC

J2000 position of star is 03:19:11.9 +15:44:08
Equinox of date position of star is 03:20:22.6 +15:48:39
Stellar brightness G=15.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 177 degrees from the moon. Moon is 73% illuminated.
TNO apparent brightness V=22.3

TNO is 32.8 AU from the Sun and 33.2 AU from the Earth.
The TNO is moving 17.9 km/sec on the sky relative to the star, or, 2.7 arcsec/hr.
The 1-sigma error in the time of the event is 99 seconds.
The 1-sigma cross-track error in the shadow position is 1289 km.

The TNO has an absolute magnitude Hv=6.9
Diameter=251.2 km assuming a 5% albedo -- 14.0 sec chord
Diameter=102.6 km assuming a 30% albedo -- 5.7 sec chord
Dynamical classification is 5:3EE
 
 
 
 
 
 
 
 

Star training set for 530839, (2021/07/19 12:05UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:09.6 +16:33:03  0.8 18.44 164
Menkar         03:03:24.5 +04:10:23  2.5 12.37 165
PPM 119093     03:28:30.1 +12:48:33  6.5  3.59 175
PPM 118986     03:19:39.4 +15:15:11  8.4  0.59 176
PPM 119007     03:21:15.0 +15:44:05  8.8  0.22 177
PPM 118994     03:20:23.6 +15:40:05 11.7  0.14 177
530839         03:20:24.4 +15:48:46 15.8       177
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 530839, (2021/07/19 12:05UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 18.44 164
Menkar         03:02:16.8 +04:05:21  2.5 12.37 165
PPM 119093     03:27:18.7 +12:44:07  6.5  3.59 175
PPM 118986     03:18:27.2 +15:10:32  8.4  0.59 176
PPM 119007     03:20:02.5 +15:39:28  8.8  0.22 177
PPM 118994     03:19:11.2 +15:35:27 11.7  0.14 177
530839         03:19:11.9 +15:44:08 15.8       177
Positions are for J2000

Event circumstances last updated at 2020/12/30 19:59:28 UT

Marc W. Buie, Southwest Research Institute

RECON