RECON: TNO occultation with 500838

Event between (500838) 13GV137 and star GA0740:05322466 with event index number of 2328972

Geocentric closest approach at 2022/02/28 07:51:41 UTC

J2000 position of star is 14:58:59.2 -15:35:55
Equinox of date position of star is 15:00:12.4 -15:41:06
Stellar brightness G=16.6, 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 8% illuminated.
TNO apparent brightness V=23.6

TNO is 46.2 AU from the Sun and 45.8 AU from the Earth.
The TNO is moving 6.9 km/sec on the sky relative to the star, or, 0.8 arcsec/hr.
The 1-sigma error in the time of the event is 1709 seconds.
The 1-sigma cross-track error in the shadow position is 5881 km.

The TNO has an absolute magnitude Hv=6.8
Diameter=263.0 km assuming a 5% albedo -- 38.0 sec chord
Diameter=107.4 km assuming a 30% albedo -- 15.5 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 500838, (2022/02/28 07:52UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:21.8 -11:16:35  1.0 23.22 104
27Bet Lib      15:18:12.2 -09:27:48  2.6  7.61  79
21Nu Lib       15:07:52.0 -16:20:29  5.2  1.95  79
PPM 229578     15:00:06.7 -15:31:26  8.5  0.16  81
PPM 229589     15:00:39.1 -15:35:46  9.5  0.14  81
500838         15:00:13.2 -15:41:09 16.6        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 500838, (2022/02/28 07:52UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 23.22 104
27Bet Lib      15:17:00.3 -09:22:59  2.6  7.61  79
21Nu Lib       15:06:37.6 -16:15:25  5.2  1.95  79
PPM 229578     14:58:52.7 -15:26:12  8.5  0.16  81
PPM 229589     14:59:25.1 -15:30:32  9.5  0.14  81
500838         14:58:59.2 -15:35:55 16.6        81
Positions are for J2000

Event circumstances last updated at 2021/12/06 01:47:18 UT

Marc W. Buie, Southwest Research Institute

RECON