RECON: TNO occultation with 02XH91

Event between 02XH91 and star UC4-569-042105 with event index number of 93001

Geocentric closest approach at 2017/12/30 01:37:37 UTC

J2000 position of star is 07:56:50.9 +23:45:46
Equinox of date position of star is 07:57:53.0 +23:42:56
Stellar brightness R=14.8, use SENSEUP=128
Star is 61 degrees from the moon. Moon is 87% illuminated.
TNO apparent brightness V=22.2

TNO is 47.2 AU from the Sun and 46.3 AU from the Earth.
The TNO is moving 24.6 km/sec on the sky relative to the star, or, 2.6 arcsec/hr.
The 1-sigma error in the time of the event is 1288 seconds.
The 1-sigma cross-track error in the shadow position is 4601 km.

The TNO has an absolute magnitude Hv=5.5
Diameter=474.3 km assuming a 5% albedo -- 19.3 sec chord
Diameter=193.6 km assuming a 30% albedo -- 7.9 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 02XH91, (2017/12/30 01:38UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:24.9 +27:58:53  1.1  4.99  59
4Ome2Cnc       08:02:48.7 +25:02:19  6.2  1.73  62
PPM 098140     07:57:10.9 +23:34:29  6.7  0.22  61
02XH91         07:57:55.4 +23:42:50 14.8        62
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 02XH91, (2017/12/30 01:38UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:18.1 +28:01:33  1.1  4.99  59
4Ome2Cnc       08:01:43.7 +25:05:22  6.2  1.73  62
PPM 098140     07:56:06.4 +23:37:25  6.7  0.22  61
02XH91         07:56:50.9 +23:45:46 14.8        61
Positions are for J2000

Event circumstances last updated at 2017/04/24 16:15:21 UT

Marc W. Buie, Southwest Research Institute

RECON