RECON: TNO occultation with 10JJ124

Event between 10JJ124 and star GA0740:22838514 with event index number of 1093047

Geocentric closest approach at 2021/05/06 21:04:48 UTC

J2000 position of star is 18:44:02.1 -15:10:25
Equinox of date position of star is 18:45:14.3 -15:09:04
Stellar brightness G=16.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 73 degrees from the moon. Moon is 21% illuminated.
TNO apparent brightness V=20.8

TNO is 25.3 AU from the Sun and 24.7 AU from the Earth.
The TNO is moving 13.4 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 401 seconds.
The 1-sigma cross-track error in the shadow position is 4993 km.

The TNO has an absolute magnitude Hv=6.6
Diameter=284.5 km assuming a 5% albedo -- 21.3 sec chord
Diameter=116.1 km assuming a 30% albedo -- 8.7 sec chord
Dynamical classification is CENTAURS
 
 
 
 
 
 
 
 

Star training set for 10JJ124, (2021/05/06 21:05UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:43.2 -26:28:39  0.9 33.29 102
Nunki          18:56:35.2 -26:16:06  2.0 11.43  70
PPM 235105     18:51:43.5 -13:32:46  6.5  2.24  71
PPM 234947     18:44:58.9 -15:15:03  8.4  0.12  73
10JJ124        18:45:15.3 -15:09:03 16.8        72
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 10JJ124, (2021/05/06 21:05UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 33.29 102
Nunki          18:55:15.9 -26:17:49  2.0 11.43  70
PPM 235105     18:50:31.2 -13:34:20  6.5  2.24  71
PPM 234947     18:43:45.6 -15:16:26  8.4  0.12  73
10JJ124        18:44:02.1 -15:10:25 16.8        73
Positions are for J2000

Event circumstances last updated at 2021/01/20 21:28:57 UT

Marc W. Buie, Southwest Research Institute

RECON