RECON: TNO occultation with 04KV18

Event between 04KV18 and star GA0740:15763926 with event index number of 1077645

Geocentric closest approach at 2021/05/06 20:44:00 UTC

J2000 position of star is 18:06:45.1 -15:25:03
Equinox of date position of star is 18:07:58.5 -15:24:49
Stellar brightness G=16.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 82 degrees from the moon. Moon is 21% illuminated.
TNO apparent brightness V=23.9

TNO is 30.2 AU from the Sun and 29.5 AU from the Earth.
The TNO is moving 15.7 km/sec on the sky relative to the star, or, 2.6 arcsec/hr.
The 1-sigma error in the time of the event is 600 seconds.
The 1-sigma cross-track error in the shadow position is 5044 km.

The TNO has an absolute magnitude Hv=9.0
Diameter=95.5 km assuming a 5% albedo -- 6.1 sec chord
Diameter=39.0 km assuming a 30% albedo -- 2.5 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 04KV18, (2021/05/06 20:44UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:43.2 -26:28:39  0.9 25.19 102
35Eta Oph      17:11:36.2 -15:44:59  2.6 13.58  95
PPM 234113     18:10:56.1 -13:55:45  6.4  1.65  81
PPM 234043     18:07:47.6 -14:58:10  8.2  0.45  82
PPM 234025     18:07:17.7 -15:20:14  9.5  0.18  82
04KV18         18:07:58.6 -15:24:49 16.9        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 04KV18, (2021/05/06 20:44UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 25.19 102
35Eta Oph      17:10:22.7 -15:43:29  2.6 13.58  95
PPM 234113     18:09:43.4 -13:56:04  6.4  1.65  81
PPM 234043     18:06:34.4 -14:58:23  8.2  0.45  82
PPM 234025     18:06:04.3 -15:20:27  9.5  0.18  82
04KV18         18:06:45.1 -15:25:03 16.9        81
Positions are for J2000

Event circumstances last updated at 2021/04/18 22:55:52 UT

Marc W. Buie, Southwest Research Institute

RECON