RECON: TNO occultation with 544977

Event between (544977) 14WZ535 and star GA0860:03621076 with event index number of 1708620

Geocentric closest approach at 2021/05/13 01:59:18 UTC

J2000 position of star is 08:51:09.5 -02:40:58
Equinox of date position of star is 08:52:13.8 -02:45:48
Stellar brightness G=16.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 71 degrees from the moon. Moon is 1% illuminated.
TNO apparent brightness V=22.8

TNO is 42.5 AU from the Sun and 42.6 AU from the Earth.
The TNO is moving 12.3 km/sec on the sky relative to the star, or, 1.4 arcsec/hr.
The 1-sigma error in the time of the event is 198 seconds.
The 1-sigma cross-track error in the shadow position is 2764 km.

The TNO has an absolute magnitude Hv=6.3
Diameter=331.1 km assuming a 5% albedo -- 26.9 sec chord
Diameter=135.2 km assuming a 30% albedo -- 11.0 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 544977, (2021/05/13 02:03UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:30.5 +11:51:43  1.3 24.14  83
Alphard        09:28:38.2 -08:45:08  2.0 10.85  81
14 Hya         08:50:26.1 -03:31:25  5.3  0.88  71
PPM 191746     08:50:55.0 -03:15:01  8.2  0.59  71
PPM 177621     08:51:40.1 -02:55:44  9.4  0.22  71
544977         08:52:14.2 -02:45:50 16.9        71
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 544977, (2021/05/13 02:03UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:22.0 +11:58:02  1.3 24.14  83
Alphard        09:27:35.2 -08:39:30  2.0 10.85  81
14 Hya         08:49:21.7 -03:26:35  5.3  0.88  71
PPM 191746     08:49:50.5 -03:10:11  8.2  0.59  71
PPM 177621     08:50:35.4 -02:50:54  9.4  0.22  71
544977         08:51:09.5 -02:40:58 16.9        71
Positions are for J2000

Event circumstances last updated at 2021/03/25 23:07:11 UT

Marc W. Buie, Southwest Research Institute

RECON