RECON: TNO occultation with 94ES2

Event between 94ES2 and star UC4-439-054219 with event index number of 114994

Geocentric closest approach at 2018/04/10 12:02:49 UTC

J2000 position of star is 12:27:17.2 -02:18:25
Equinox of date position of star is 12:28:10.8 -02:24:11
Stellar brightness R=13.1, use SENSEUP=32
Star is 127 degrees from the moon. Moon is 30% illuminated.
TNO apparent brightness V=24.0

TNO is 43.3 AU from the Sun and 42.3 AU from the Earth.
The TNO is moving 24.4 km/sec on the sky relative to the star, or, 2.9 arcsec/hr.
The 1-sigma error in the time of the event is 305 seconds.
The 1-sigma cross-track error in the shadow position is 4809 km.

The TNO has an absolute magnitude Hv=7.6
Diameter=183.7 km assuming a 5% albedo -- 7.5 sec chord
Diameter=75.0 km assuming a 30% albedo -- 3.1 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 94ES2, (2018/04/10 12:03UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:09.5 -11:15:22  1.0 16.87 111
4Gam Crv       12:16:44.9 -17:38:36  2.6 15.49 123
PPM 195518     12:28:47.9 -04:42:58  6.2  2.31 126
PPM 178799     12:30:06.0 -02:31:50  8.2  0.48 127
PPM 178792     12:28:42.6 -02:29:14  8.7  0.14 127
94ES2          12:28:13.5 -02:24:29 13.1       127
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 94ES2, (2018/04/10 12:03UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 16.87 111
4Gam Crv       12:15:48.2 -17:32:31  2.6 15.49 123
PPM 195518     12:27:51.5 -04:36:55  6.2  2.31 126
PPM 178799     12:29:09.7 -02:25:47  8.2  0.48 127
PPM 178792     12:27:46.3 -02:23:10  8.7  0.14 127
94ES2          12:27:17.2 -02:18:25 13.1       127
Positions are for J2000

Event circumstances last updated at 2017/05/18 18:01:18 UT

Marc W. Buie, Southwest Research Institute

RECON