RECON: TNO occultation with 01VN71

Event between 01VN71 and star UC4-610-032029 with event index number of 97827

Geocentric closest approach at 2018/01/31 14:15:23 UTC

J2000 position of star is 06:22:17.9 +31:49:56
Equinox of date position of star is 06:23:21.1 +31:49:23
Stellar brightness R=16.5
Star is 38 degrees from the moon. Moon is 100% illuminated.
TNO apparent brightness V=23.8

TNO is 30.3 AU from the Sun and 29.5 AU from the Earth.
The TNO is moving 18.7 km/sec on the sky relative to the star, or, 3.1 arcsec/hr.
The 1-sigma error in the time of the event is 415 seconds.
The 1-sigma cross-track error in the shadow position is 3640 km.

The TNO has an absolute magnitude Hv=8.9
Diameter=102.3 km assuming a 5% albedo -- 5.5 sec chord
Diameter=41.8 km assuming a 30% albedo -- 2.2 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 01VN71, (2018/01/31 14:15UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:25.3 +27:58:52  1.1 18.35  20
Alnath         05:27:26.2 +28:37:16  1.6 12.51  50
48 Aur         06:29:43.8 +30:28:49  6.4  1.90  37
PPM 071595     06:26:23.5 +32:15:37  8.1  0.76  38
PPM 071536     06:23:01.1 +31:56:09 10.0  0.15  38
01VN71         06:23:28.4 +31:49:20 16.5        38
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.

Event circumstances last updated at 2016/03/12 18:20:53 UT

Marc W. Buie, Southwest Research Institute

RECON