RECON: TNO occultation with 488644

Event between (488644) 03HY56 and star UC4-380-067254 with event index number of 193887

Geocentric closest approach at 2019/05/23 03:24:57 UTC

J2000 position of star is 14:19:46.9 -14:03:20
Equinox of date position of star is 14:20:43.8 -14:08:06
Stellar brightness R=15.9, use SENSEUP=128
Star is 75 degrees from the moon. Moon is 82% illuminated.
TNO apparent brightness V=24.1

TNO is 41.9 AU from the Sun and 41.0 AU from the Earth.
The TNO is moving 22.3 km/sec on the sky relative to the star, or, 2.7 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 1665 km.

The TNO has an absolute magnitude Hv=7.9
Diameter=158.5 km assuming a 5% albedo -- 7.1 sec chord
Diameter=64.7 km assuming a 30% albedo -- 2.9 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 488644, (2019/05/23 03:25UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:13.0 -11:15:43  1.0 13.63  89
2 Lib          14:24:28.4 -11:48:06  6.2  2.50  75
PPM 228623     14:20:18.3 -14:29:47  7.3  0.38  75
PPM 228610     14:19:56.4 -14:06:17  9.7  0.22  76
488644         14:20:50.3 -14:08:38 15.9        75
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 488644, (2019/05/23 03:25UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 13.63  89
2 Lib          14:23:25.6 -11:42:52  6.2  2.50  75
PPM 228623     14:19:14.9 -14:24:29  7.3  0.38  75
PPM 228610     14:18:53.0 -14:00:58  9.7  0.22  76
488644         14:19:46.9 -14:03:20 15.9        75
Positions are for J2000

Event circumstances last updated at 2017/06/01 18:15:36 UT

Marc W. Buie, Southwest Research Institute

RECON