RECON: TNO occultation with 469438

Event between (469438) 02GV31 and star UC4-462-048516 with event index number of 148381

Geocentric closest approach at 2017/12/22 00:04:57 UTC

J2000 position of star is 11:57:58.0 +02:19:17
Equinox of date position of star is 11:58:51.4 +02:13:29
Stellar brightness R=14.3, use SENSEUP=64
Star is 132 degrees from the moon. Moon is 12% illuminated.
TNO apparent brightness V=22.6

TNO is 40.1 AU from the Sun and 40.1 AU from the Earth.
The TNO is moving 4.1 km/sec on the sky relative to the star, or, 0.5 arcsec/hr.
The 1-sigma error in the time of the event is 1157 seconds.
The 1-sigma cross-track error in the shadow position is 3683 km.

The TNO has an absolute magnitude Hv=6.4
Diameter=316.2 km assuming a 5% albedo -- 76.6 sec chord
Diameter=129.1 km assuming a 30% albedo -- 31.3 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 469438, (2017/12/22 00:05UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:08.5 -11:15:17  1.0 25.54 107
Denebola       11:49:58.5 +14:28:18  2.1 12.45 137
7 Vir          12:00:52.2 +03:33:18  5.4  1.42 132
PPM 158396     12:00:19.2 +01:43:35  7.9  0.61 131
PPM 158356     11:57:53.5 +02:18:42  9.3  0.26 132
469438         11:58:53.2 +02:13:17 14.3       132
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 469438, (2017/12/22 00:05UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 25.54 107
Denebola       11:49:03.0 +14:34:17  2.1 12.45 137
7 Vir          11:59:56.9 +03:39:18  5.4  1.42 132
PPM 158396     11:59:23.9 +01:49:35  7.9  0.61 131
PPM 158356     11:56:58.2 +02:24:43  9.3  0.26 132
469438         11:57:58.0 +02:19:17 14.3       132
Positions are for J2000

Event circumstances last updated at 2017/05/17 17:58:18 UT

Marc W. Buie, Southwest Research Institute

RECON