RECON: TNO occultation with 14UD225

Event between 14UD225 and star UC4-518-002894 with event index number of 179714

Geocentric closest approach at 2017/10/31 15:21:14 UTC

J2000 position of star is 01:42:12.7 +13:26:59
Equinox of date position of star is 01:43:08.1 +13:32:10
Stellar brightness R=15.4, use SENSEUP=128
Star is 38 degrees from the moon. Moon is 84% illuminated.
TNO apparent brightness V=23.3

TNO is 44.7 AU from the Sun and 43.7 AU from the Earth.
The TNO is moving 25.1 km/sec on the sky relative to the star, or, 2.9 arcsec/hr.
The 1-sigma error in the time of the event is 136 seconds.
The 1-sigma cross-track error in the shadow position is 3106 km.

The TNO has an absolute magnitude Hv=6.8
Diameter=265.5 km assuming a 5% albedo -- 10.6 sec chord
Diameter=108.4 km assuming a 30% albedo -- 4.3 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 14UD225, (2017/10/31 15:21UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:36:56.8 +16:32:38  0.8 41.99  78
6Bet Ari       01:55:37.7 +20:53:40  2.6  7.93  44
102Pi Psc      01:38:02.8 +12:13:56  5.6  1.81  36
PPM 117568     01:42:01.8 +13:51:47  8.5  0.43  37
PPM 117580     01:42:32.1 +13:30:35  9.9  0.16  37
14UD225        01:43:10.1 +13:32:21 15.4        38
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 14UD225, (2017/10/31 15:21UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 41.99  78
6Bet Ari       01:54:38.5 +20:48:27  2.6  7.93  44
102Pi Psc      01:37:05.8 +12:08:30  5.6  1.81  36
PPM 117568     01:41:04.5 +13:46:24  8.5  0.43  37
PPM 117580     01:41:34.8 +13:25:13  9.9  0.16  37
14UD225        01:42:12.7 +13:26:59 15.4        38
Positions are for J2000

Event circumstances last updated at 2017/03/21 16:09:00 UT

Marc W. Buie, Southwest Research Institute

RECON