RECON: TNO occultation with 12XR157

Event between 12XR157 and star GA0940:00670158 with event index number of 314014

Geocentric closest approach at 2019/11/18 22:27:12 UTC

J2000 position of star is 05:17:41.6 +04:25:48
Equinox of date position of star is 05:18:43.3 +04:26:59
Stellar brightness G=14.6, use SENSEUP=128
Star is 58 degrees from the moon. Moon is 61% illuminated.
TNO apparent brightness V=22.4

TNO is 40.4 AU from the Sun and 39.6 AU from the Earth.
The TNO is moving 24.0 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 104 seconds.
The 1-sigma cross-track error in the shadow position is 1847 km.

The TNO has an absolute magnitude Hv=6.3
Diameter=335.7 km assuming a 5% albedo -- 14.0 sec chord
Diameter=137.1 km assuming a 30% albedo -- 5.7 sec chord
Dynamical classification is 2:1E
 
 
 
 
 
 
 
 

Star training set for 12XR157, (2019/11/18 22:27UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:14.9 +07:24:33  0.4  9.78  49
Bellatrix      05:26:11.9 +06:21:58  1.6  2.67  56
PPM 148809     05:22:22.3 +04:01:49  6.3  1.00  58
PPM 148723     05:19:06.2 +03:42:43  8.3  0.74  59
PPM 148715     05:18:42.4 +04:42:13  8.7  0.25  58
12XR157        05:18:44.7 +04:27:00 14.6        58
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 12XR157, (2019/11/18 22:27UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  9.78  49
Bellatrix      05:25:07.8 +06:20:58  1.6  2.67  56
PPM 148809     05:21:19.3 +04:00:43  6.3  1.00  58
PPM 148723     05:18:03.4 +03:41:31  8.3  0.74  59
PPM 148715     05:17:39.1 +04:41:00  8.7  0.25  58
12XR157        05:17:41.6 +04:25:48 14.6        58
Positions are for J2000

Event circumstances last updated at 2019/06/07 22:53:33 UT

Marc W. Buie, Southwest Research Institute

RECON