RECON: TNO occultation with 04KC19

Event between 04KC19 and star GA0680:23055061 with event index number of 1076751

Geocentric closest approach at 2021/05/24 18:31:42 UTC

J2000 position of star is 18:12:26.3 -20:22:46
Equinox of date position of star is 18:13:41.3 -20:22:22
Stellar brightness G=14.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 53 degrees from the moon. Moon is 96% illuminated.
TNO apparent brightness V=23.4

TNO is 30.5 AU from the Sun and 29.6 AU from the Earth.
The TNO is moving 19.6 km/sec on the sky relative to the star, or, 3.3 arcsec/hr.
The 1-sigma error in the time of the event is 739 seconds.
The 1-sigma cross-track error in the shadow position is 2233 km.

The TNO has an absolute magnitude Hv=8.5
Diameter=121.3 km assuming a 5% albedo -- 6.2 sec chord
Diameter=49.5 km assuming a 30% albedo -- 2.5 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 04KC19, (2021/05/24 18:32UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:43.4 -26:28:40  0.9 24.35  31
Nunki          18:56:35.4 -26:16:06  2.0 11.47  63
16 Sgr         18:16:29.3 -20:22:47  6.4  0.65  54
PPM 268032     18:13:13.5 -20:25:01  7.9  0.12  53
PPM 268050     18:13:56.3 -20:26:51  9.6  0.09  53
04KC19         18:13:42.7 -20:22:22 14.6        53
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 04KC19, (2021/05/24 18:32UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 24.35  31
Nunki          18:55:15.9 -26:17:49  2.0 11.47  63
16 Sgr         18:15:13.0 -20:23:17  6.4  0.65  54
PPM 268032     18:11:57.1 -20:25:24  7.9  0.12  53
PPM 268050     18:12:39.9 -20:27:16  9.6  0.09  53
04KC19         18:12:26.3 -20:22:46 14.6        53
Positions are for J2000

Event circumstances last updated at 2021/01/02 19:57:11 UT

Marc W. Buie, Southwest Research Institute

RECON