RECON: TNO occultation with 469615

Event between (469615) 04PT107 and star TYC25228-00768-1 with event index number of 147656

Geocentric closest approach at 2018/09/05 18:25:57 UTC

J2000 position of star is 22:16:52.7 -03:06:35
Equinox of date position of star is 22:17:48.4 -03:01:11
Stellar brightness V=12.2, use SENSEUP=16
Star is 133 degrees from the moon. Moon is 21% illuminated.
TNO apparent brightness V=21.6

TNO is 38.2 AU from the Sun and 37.2 AU from the Earth.
The TNO is moving 24.8 km/sec on the sky relative to the star, or, 3.3 arcsec/hr.
The 1-sigma error in the time of the event is 84 seconds.
The 1-sigma cross-track error in the shadow position is 2150 km.

The TNO has an absolute magnitude Hv=5.8
Diameter=416.9 km assuming a 5% albedo -- 16.8 sec chord
Diameter=170.2 km assuming a 30% albedo -- 6.9 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 469615, (2018/09/05 18:26UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:40.7 -29:31:22  1.2 28.22 130
Markab         23:05:41.6 +15:18:22  2.5 21.81 114
PPM 206055     22:11:32.1 -04:10:28  6.0  1.95 135
PPM 206113     22:14:40.4 -03:40:58  8.4  1.04 134
PPM 206184     22:18:12.7 -02:54:48  8.9  0.14 133
469615         22:17:50.7 -03:00:58 12.2       133
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 469615, (2018/09/05 18:26UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.5 -29:37:23  1.2 28.22 130
Markab         23:04:45.7 +15:12:18  2.5 21.81 114
PPM 206055     22:10:33.9 -04:16:01  6.0  1.95 135
PPM 206113     22:13:42.3 -03:46:34  8.4  1.04 134
PPM 206184     22:17:14.7 -03:00:26  8.9  0.14 133
469615         22:16:52.7 -03:06:35 12.2       133
Positions are for J2000

Event circumstances last updated at 2017/12/05 18:55:21 UT

Marc W. Buie, Southwest Research Institute

RECON