RECON: TNO occultation with 04HX78

Event between 04HX78 and star UC4-378-084408 with event index number of 113345

Geocentric closest approach at 2018/05/02 21:07:53 UTC

J2000 position of star is 17:21:00.1 -14:30:30
Equinox of date position of star is 17:21:59.3 -14:31:28
Stellar brightness R=15.7, use SENSEUP=128
Star is 7 degrees from the moon. Moon is 92% illuminated.
TNO apparent brightness V=23.4

TNO is 33.5 AU from the Sun and 32.7 AU from the Earth.
The TNO is moving 18.0 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 730 seconds.
The 1-sigma cross-track error in the shadow position is 4087 km.

The TNO has an absolute magnitude Hv=8.1
Diameter=143.9 km assuming a 5% albedo -- 8.0 sec chord
Diameter=58.7 km assuming a 30% albedo -- 3.3 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 04HX78, (2018/05/02 21:08UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:32.1 -26:28:16  0.9 16.95  10
35Eta Oph      17:11:25.9 -15:44:47  2.6  2.84   4
PPM 232829     17:16:22.9 -14:36:13  5.9  1.37   6
PPM 232909     17:20:00.9 -15:14:19  8.1  0.87   6
PPM 232982     17:23:02.7 -14:19:51  9.3  0.31   7
04HX78         17:22:02.7 -14:31:31 15.7         7
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 04HX78, (2018/05/02 21:08UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:55  0.9 16.95  10
35Eta Oph      17:10:22.7 -15:43:29  2.6  2.84   4
PPM 232829     17:15:20.3 -14:35:03  5.9  1.37   6
PPM 232909     17:18:58.0 -15:13:15  8.1  0.87   6
PPM 232982     17:22:00.1 -14:18:51  9.3  0.31   7
04HX78         17:21:00.1 -14:30:30 15.7         7
Positions are for J2000

Event circumstances last updated at 2017/04/24 16:23:49 UT

Marc W. Buie, Southwest Research Institute

RECON