RECON: TNO occultation with 11EZ90

Event between 11EZ90 and star GA1180:03447742 with event index number of 1576864

Geocentric closest approach at 2021/02/02 21:25:48 UTC

J2000 position of star is 12:08:23.0 +29:34:02
Equinox of date position of star is 12:09:27.1 +29:27:00
Stellar brightness G=15.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 38 degrees from the moon. Moon is 71% illuminated.
TNO apparent brightness V=22.4

TNO is 38.3 AU from the Sun and 37.5 AU from the Earth.
The TNO is moving 21.4 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 179 seconds.
The 1-sigma cross-track error in the shadow position is 5371 km.

The TNO has an absolute magnitude Hv=6.5
Diameter=303.4 km assuming a 5% albedo -- 14.2 sec chord
Diameter=123.9 km assuming a 30% albedo -- 5.8 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 11EZ90, (2021/02/02 21:26UT)
Object            RA         Dec     mag  sep  mel
Arcturus       14:16:37.4 +19:04:24  0.0 30.66  27
68Del Leo      11:15:13.6 +20:24:28  2.6 15.24  39
PPM 101779     12:18:34.2 +28:49:13  5.7  2.09  36
PPM 101695     12:11:31.9 +28:57:03  8.5  0.67  37
PPM 101677     12:10:25.8 +29:20:36  8.9  0.24  37
11EZ90         12:09:27.2 +29:26:59 15.9        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 11EZ90, (2021/02/02 21:26UT)
Object            RA         Dec     mag  sep  mel
Arcturus       14:15:38.1 +19:10:15  0.0 30.66  27
68Del Leo      11:14:06.7 +20:31:23  2.6 15.24  39
PPM 101779     12:17:30.5 +28:56:15  5.7  2.09  36
PPM 101695     12:10:27.7 +29:04:05  8.5  0.67  37
PPM 101677     12:09:21.6 +29:27:38  8.9  0.24  37
11EZ90         12:08:23.0 +29:34:02 15.9        38
Positions are for J2000

Event circumstances last updated at 2021/01/18 21:13:18 UT

Marc W. Buie, Southwest Research Institute

RECON