RECON: TNO occultation with 10EL139

Event between 10EL139 and star GA0540:06884689 with event index number of 1032488

Geocentric closest approach at 2021/01/14 08:23:00 UTC

J2000 position of star is 14:00:44.0 -35:04:30
Equinox of date position of star is 14:01:58.4 -35:10:32
Stellar brightness G=15.3, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 87 degrees from the moon. Moon is 2% illuminated.
TNO apparent brightness V=21.3

TNO is 37.4 AU from the Sun and 37.6 AU from the Earth.
The TNO is moving 17.7 km/sec on the sky relative to the star, or, 2.3 arcsec/hr.
The 1-sigma error in the time of the event is 77 seconds.
The 1-sigma cross-track error in the shadow position is 1364 km.

The TNO has an absolute magnitude Hv=5.4
Diameter=498.9 km assuming a 5% albedo -- 28.2 sec chord
Diameter=203.7 km assuming a 30% albedo -- 11.5 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 10EL139, (2021/01/14 08:23UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:18.3 -11:16:14  1.0 25.24 105
5The Cen       14:07:55.7 -36:28:21  2.1  1.77  85
PPM 291956     13:55:05.8 -35:25:03  6.4  1.42  88
PPM 292059     13:59:56.3 -35:03:22  8.5  0.43  87
PPM 292116     14:02:49.1 -35:09:49  9.7  0.17  87
10EL139        14:01:58.7 -35:10:34 15.3        87
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 10EL139, (2021/01/14 08:23UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 25.24 105
5The Cen       14:06:40.0 -36:22:23  2.1  1.77  85
PPM 291956     13:53:51.6 -35:18:53  6.4  1.42  88
PPM 292059     13:58:41.8 -34:57:16  8.5  0.43  87
PPM 292116     14:01:34.4 -35:03:46  9.7  0.17  87
10EL139        14:00:44.0 -35:04:30 15.3        87
Positions are for J2000

Event circumstances last updated at 2020/12/14 19:20:38 UT

Marc W. Buie, Southwest Research Institute

RECON