RECON: TNO occultation with 437871

Event between (437871) 01FN185 and star UC4-409-058694 with event index number of 67203

Geocentric closest approach at 2017/04/28 15:18:17 UTC

J2000 position of star is 14:43:56.5 -08:23:59
Equinox of date position of star is 14:44:48.5 -08:28:04
Stellar brightness R=16.5
Star is 153 degrees from the moon. Moon is 7% illuminated.
TNO apparent brightness V=23.1

TNO is 39.5 AU from the Sun and 38.5 AU from the Earth.
The TNO is moving 25.0 km/sec on the sky relative to the star, or, 3.2 arcsec/hr.
The 1-sigma error in the time of the event is 267 seconds.
The 1-sigma cross-track error in the shadow position is 2579 km.

The TNO has an absolute magnitude Hv=7.2
Diameter=218.8 km assuming a 5% albedo -- 8.8 sec chord
Diameter=89.3 km assuming a 30% albedo -- 3.6 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 437871, (2017/04/28 15:18UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:06.5 -11:15:04  1.0 19.59 135
27Bet Lib      15:17:56.5 -09:26:45  2.6  8.23 161
107Mu Vir      14:43:58.5 -05:43:57  3.9  2.75 151
PPM 197859     14:45:09.0 -08:19:27  6.9  0.16 153
PPM 197854     14:44:41.0 -08:23:38  9.5  0.09 153
437871         14:44:52.1 -08:28:20 16.5       153
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 2016/03/20 17:20:56 UT

RECON