RECON: TNO occultation with 250112

Event between (250112) 02KY14 and star UC4-512-026061 with event index number of 165763

Geocentric closest approach at 2018/11/21 22:38:38 UTC

J2000 position of star is 06:36:32.4 +12:12:37
Equinox of date position of star is 06:37:30.8 +12:11:41
Stellar brightness R=15.8, use SENSEUP=128
Star is 56 degrees from the moon. Moon is 98% illuminated.
TNO apparent brightness V=21.0

TNO is 12.9 AU from the Sun and 12.1 AU from the Earth.
The TNO is moving 17.1 km/sec on the sky relative to the star, or, 7.0 arcsec/hr.
The 1-sigma error in the time of the event is 45 seconds.
The 1-sigma cross-track error in the shadow position is 516 km.

The TNO has an absolute magnitude Hv=9.7
Diameter=69.2 km assuming a 5% albedo -- 4.1 sec chord
Diameter=28.2 km assuming a 30% albedo -- 1.7 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 250112, (2018/11/21 22:39UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:11.7 +07:24:33  0.4 11.26  46
Alhena         06:38:48.2 +16:22:54  1.9  4.20  56
PPM 122607     06:32:42.7 +11:46:39  6.3  1.27  55
PPM 122757     06:37:40.4 +11:50:42  7.8  0.35  56
PPM 122729     06:36:45.5 +12:09:05  8.6  0.21  56
250112         06:37:35.9 +12:11:36 15.8        56
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 250112, (2018/11/21 22:39UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 11.26  46
Alhena         06:37:42.8 +16:23:57  1.9  4.20  56
PPM 122607     06:31:39.4 +11:47:32  6.3  1.27  55
PPM 122757     06:36:37.1 +11:51:43  7.8  0.35  56
PPM 122729     06:35:42.0 +12:10:04  8.6  0.21  56
250112         06:36:32.4 +12:12:37 15.8        56
Positions are for J2000

Event circumstances last updated at 2017/05/19 18:06:08 UT

Marc W. Buie, Southwest Research Institute

RECON