RECON: TNO occultation with 471288

Event between (471288) 11GM27 and star UC4-375-063808 with event index number of 145007

Geocentric closest approach at 2018/04/15 15:00:24 UTC

J2000 position of star is 12:14:24.8 -15:01:25
Equinox of date position of star is 12:15:16.4 -15:06:58
Stellar brightness R=16.2
Star is 160 degrees from the moon. Moon is 0% illuminated.
TNO apparent brightness V=21.5

TNO is 43.6 AU from the Sun and 42.7 AU from the Earth.
The TNO is moving 24.3 km/sec on the sky relative to the star, or, 2.8 arcsec/hr.
The 1-sigma error in the time of the event is 139 seconds.
The 1-sigma cross-track error in the shadow position is 2229 km.

The TNO has an absolute magnitude Hv=5.1
Diameter=575.5 km assuming a 5% albedo -- 23.7 sec chord
Diameter=234.9 km assuming a 30% albedo -- 9.7 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 471288, (2018/04/15 15:00UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:09.5 -11:15:22  1.0 17.66 172
4Gam Crv       12:16:45.0 -17:38:36  2.6  2.54 159
PPM 225621     12:18:00.1 -16:47:43  6.3  1.79 160
PPM 225545     12:14:47.8 -16:04:40  8.4  0.96 159
PPM 225553     12:15:07.8 -15:05:31  9.5  0.06 160
471288         12:15:21.4 -15:07:30 16.2       160
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 471288, (2018/04/15 15:00UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 17.66 172
4Gam Crv       12:15:48.2 -17:32:31  2.6  2.54 159
PPM 225621     12:17:03.3 -16:41:38  6.3  1.79 160
PPM 225545     12:13:51.2 -15:58:34  8.4  0.96 159
PPM 225553     12:14:11.2 -14:59:25  9.5  0.06 160
471288         12:14:24.8 -15:01:25 16.2       160
Positions are for J2000

Event circumstances last updated at 2016/09/01 18:23:26 UT

Marc W. Buie, Southwest Research Institute

RECON