RECON: TNO occultation with 90482

Event between (90482) Orcus and star UC4-399-047888 with event index number of 184644

Geocentric closest approach at 2019/04/07 21:03:00 UTC

J2000 position of star is 10:13:23.1 -10:21:09
Equinox of date position of star is 10:14:14.3 -10:26:18
Stellar brightness R=15.3, use SENSEUP=128
Star is 109 degrees from the moon. Moon is 7% illuminated.
TNO apparent brightness V=19.1

TNO is 48.1 AU from the Sun and 47.3 AU from the Earth.
The TNO is moving 20.7 km/sec on the sky relative to the star, or, 2.2 arcsec/hr.
The 1-sigma error in the time of the event is 92 seconds.
The 1-sigma cross-track error in the shadow position is 1855 km.

The TNO has an absolute magnitude Hv=2.2
Diameter=2187.8 km assuming a 5% albedo -- 105.6 sec chord
Diameter=893.2 km assuming a 30% albedo -- 43.1 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 90482, (2019/04/07 21:03UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:23.8 +11:52:20  1.3 22.35 103
Alphard        09:28:32.1 -08:44:35  2.0 11.42  98
PPM 222699     10:17:06.0 -11:18:00  5.9  1.09 110
PPM 222612     10:13:16.3 -10:25:02  8.2  0.26 109
PPM 222640     10:14:22.2 -10:29:50  9.5  0.05 109
90482          10:14:20.3 -10:26:54 15.3       109
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 90482, (2019/04/07 21:03UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:22.0 +11:58:02  1.3 22.35 103
Alphard        09:27:35.2 -08:39:31  2.0 11.42  98
PPM 222699     10:16:08.9 -11:12:12  5.9  1.09 110
PPM 222612     10:12:19.2 -10:19:17  8.2  0.26 109
PPM 222640     10:13:25.0 -10:24:05  9.5  0.05 109
90482          10:13:23.1 -10:21:09 15.3       109
Positions are for J2000

Event circumstances last updated at 2017/04/01 17:01:17 UT

Marc W. Buie, Southwest Research Institute

RECON