RECON: TNO occultation with 04KG19

Event between 04KG19 and star GA0660:07547335 with event index number of 1077284

Geocentric closest approach at 2021/06/20 19:24:52 UTC

J2000 position of star is 16:35:44.0 -22:45:53
Equinox of date position of star is 16:37:00.7 -22:48:25
Stellar brightness G=16.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 36 degrees from the moon. Moon is 79% illuminated.
TNO apparent brightness V=23.9

TNO is 42.5 AU from the Sun and 41.6 AU from the Earth.
The TNO is moving 23.2 km/sec on the sky relative to the star, or, 2.8 arcsec/hr.
The 1-sigma error in the time of the event is 650 seconds.
The 1-sigma cross-track error in the shadow position is 2641 km.

The TNO has an absolute magnitude Hv=7.6
Diameter=182.0 km assuming a 5% albedo -- 7.9 sec chord
Diameter=74.3 km assuming a 30% albedo -- 3.2 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 04KG19, (2021/06/20 19:25UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:43.6 -26:28:40  0.9  3.94  36
23Tau Sco      16:37:13.4 -28:15:31  2.8  5.45  38
22 Sco         16:31:31.0 -25:09:39  4.5  2.67  36
PPM 265749     16:39:36.6 -22:56:05  7.7  0.61  37
PPM 265700     16:37:09.8 -22:45:55 10.0  0.05  36
04KG19         16:37:01.3 -22:48:26 16.4        37
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 04KG19, (2021/06/20 19:25UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  3.94  36
23Tau Sco      16:35:52.9 -28:12:58  2.8  5.45  38
22 Sco         16:30:12.5 -25:06:55  4.5  2.67  36
PPM 265749     16:38:19.2 -22:53:36  7.7  0.61  37
PPM 265700     16:35:52.6 -22:43:22 10.0  0.05  36
04KG19         16:35:44.0 -22:45:53 16.4        36
Positions are for J2000

Event circumstances last updated at 2021/04/18 22:56:52 UT

Marc W. Buie, Southwest Research Institute

RECON