RECON: TNO occultation with 420356

Event between (420356) Praamzius and star GA1040:03298250 with event index number of 1056241

Geocentric closest approach at 2021/02/20 01:44:36 UTC

J2000 position of star is 09:28:15.5 +14:48:25
Equinox of date position of star is 09:29:24.8 +14:42:52
Stellar brightness G=16.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 75 degrees from the moon. Moon is 53% illuminated.
TNO apparent brightness V=22.1

TNO is 43.0 AU from the Sun and 42.1 AU from the Earth.
The TNO is moving 25.1 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 161 seconds.
The 1-sigma cross-track error in the shadow position is 2134 km.

The TNO has an absolute magnitude Hv=5.8
Diameter=426.6 km assuming a 5% albedo -- 17.0 sec chord
Diameter=174.2 km assuming a 30% albedo -- 6.9 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 420356, (2021/02/20 01:45UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:29.7 +11:51:47  1.3 10.16  85
PPM 126361     09:22:25.2 +15:16:50  6.4  1.78  73
PPM 126489     09:29:34.9 +15:04:21  8.4  0.36  75
420356         09:29:25.0 +14:42:50 16.9        75
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 420356, (2021/02/20 01:45UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:22.0 +11:58:02  1.3 10.16  85
PPM 126361     09:21:15.3 +15:22:17  6.4  1.78  73
PPM 126489     09:28:25.2 +15:09:56  8.4  0.36  75
420356         09:28:15.5 +14:48:25 16.9        75
Positions are for J2000

Event circumstances last updated at 2021/01/18 21:42:59 UT

Marc W. Buie, Southwest Research Institute

RECON