RECON: TNO occultation with 307251

Event between (307251) 02KW14 and star GA0620:14128334 with event index number of 1165392

Geocentric closest approach at 2021/06/06 21:59:59 UTC

J2000 position of star is 17:10:05.7 -26:13:14
Equinox of date position of star is 17:11:24.0 -26:14:44
Stellar brightness G=16.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 139 degrees from the moon. Moon is 11% illuminated.
TNO apparent brightness V=21.9

TNO is 42.7 AU from the Sun and 41.7 AU from the Earth.
The TNO is moving 24.7 km/sec on the sky relative to the star, or, 2.9 arcsec/hr.
The 1-sigma error in the time of the event is 406 seconds.
The 1-sigma cross-track error in the shadow position is 3246 km.

The TNO has an absolute magnitude Hv=5.6
Diameter=457.1 km assuming a 5% albedo -- 18.5 sec chord
Diameter=186.6 km assuming a 30% albedo -- 7.6 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 307251, (2021/06/06 22:00UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:43.5 -26:28:40  0.9  9.12 147
23Tau Sco      16:37:13.2 -28:15:31  2.8  7.86 145
PPM 266416     17:08:13.1 -26:32:25  6.3  0.78 139
PPM 266507     17:11:52.2 -26:16:14  8.3  0.10 139
307251         17:11:25.4 -26:14:46 16.0       138
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 307251, (2021/06/06 22:00UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  9.12 147
23Tau Sco      16:35:52.9 -28:12:58  2.8  7.86 145
PPM 266416     17:06:53.2 -26:30:47  6.3  0.78 139
PPM 266507     17:10:32.5 -26:14:44  8.3  0.10 139
307251         17:10:05.7 -26:13:14 16.0       139
Positions are for J2000

Event circumstances last updated at 2021/01/21 21:45:32 UT

Marc W. Buie, Southwest Research Institute

RECON