RECON: TNO occultation with 471921

Event between (471921) 13FC28 and star UC4-432-054500 with event index number of 309794

Geocentric closest approach at 2020/02/15 01:07:40 UTC

J2000 position of star is 11:54:54.2 -03:47:05
Equinox of date position of star is 11:55:53.9 -03:53:34
Stellar brightness R=12.5, use SENSEUP=16
Star is 45 degrees from the moon. Moon is 60% illuminated.
TNO apparent brightness V=22.0

TNO is 47.1 AU from the Sun and 46.3 AU from the Earth.
The TNO is moving 20.4 km/sec on the sky relative to the star, or, 2.2 arcsec/hr.
The 1-sigma error in the time of the event is 441 seconds.
The 1-sigma cross-track error in the shadow position is 3126 km.

The TNO has an absolute magnitude Hv=5.2
Diameter=549.6 km assuming a 5% albedo -- 26.9 sec chord
Diameter=224.4 km assuming a 30% albedo -- 11.0 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 471921, (2020/02/15 01:08UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:15.4 -11:15:57  1.0 23.55  22
4Gam Crv       12:16:50.6 -17:39:13  2.6 14.68  38
PPM 194890     11:52:04.0 -05:26:43  5.6  1.82  45
PPM 194938     11:54:53.8 -03:53:21  7.5  0.26  45
PPM 194966     11:56:25.6 -03:42:43  8.8  0.22  45
471921         11:55:56.0 -03:53:48 12.5        45
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 471921, (2020/02/15 01:08UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 23.55  22
4Gam Crv       12:15:48.2 -17:32:31  2.6 14.68  38
PPM 194890     11:51:02.2 -05:20:00  5.6  1.82  45
PPM 194938     11:53:52.0 -03:46:38  7.5  0.26  45
PPM 194966     11:55:23.7 -03:35:59  8.8  0.22  45
471921         11:54:54.2 -03:47:05 12.5        45
Positions are for J2000

Event circumstances last updated at 2019/06/07 23:16:19 UT

Marc W. Buie, Southwest Research Institute

RECON