RECON: TNO occultation with 04HC79

Event between 04HC79 and star UC4-339-080176 with event index number of 123357

Geocentric closest approach at 2018/04/14 15:54:22 UTC

J2000 position of star is 16:39:42.3 -22:12:27
Equinox of date position of star is 16:40:44.6 -22:14:26
Stellar brightness R=16.5, use SENSEUP=128
Star is 115 degrees from the moon. Moon is 3% illuminated.
TNO apparent brightness V=23.5

TNO is 39.5 AU from the Sun and 38.8 AU from the Earth.
The TNO is moving 14.8 km/sec on the sky relative to the star, or, 1.9 arcsec/hr.
The 1-sigma error in the time of the event is 554 seconds.
The 1-sigma cross-track error in the shadow position is 4451 km.

The TNO has an absolute magnitude Hv=7.4
Diameter=201.4 km assuming a 5% albedo -- 13.6 sec chord
Diameter=82.2 km assuming a 30% albedo -- 5.6 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 04HC79, (2018/04/14 15:54UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:31.9 -26:28:16  0.9  4.83 117
23Tau Sco      16:37:01.4 -28:15:09  2.8  6.07 115
PPM 232040     16:42:58.3 -19:57:29  5.8  2.34 115
PPM 265749     16:39:25.1 -22:55:43  7.7  0.76 115
PPM 265777     16:40:49.0 -22:20:05  9.2  0.09 115
04HC79         16:40:47.9 -22:14:32 16.5       115
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 04HC79, (2018/04/14 15:54UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  4.83 117
23Tau Sco      16:35:53.0 -28:12:58  2.8  6.07 115
PPM 232040     16:41:53.7 -19:55:27  5.8  2.34 115
PPM 265749     16:38:19.2 -22:53:36  7.7  0.76 115
PPM 265777     16:39:43.4 -22:18:00  9.2  0.09 115
04HC79         16:39:42.3 -22:12:27 16.5       115
Positions are for J2000

Event circumstances last updated at 2017/05/14 18:40:36 UT

Marc W. Buie, Southwest Research Institute

RECON