RECON: TNO occultation with 500879

Event between (500879) 13JH64 and star UC4-376-074835 with event index number of 220969

Geocentric closest approach at 2018/07/19 07:59:09 UTC

J2000 position of star is 16:02:57.1 -14:59:51
Equinox of date position of star is 16:03:57.9 -15:02:46
Stellar brightness R=14.9, use SENSEUP=128
Star is 41 degrees from the moon. Moon is 45% illuminated.
TNO apparent brightness V=23.1

TNO is 52.5 AU from the Sun and 51.9 AU from the Earth.
The TNO is moving 13.3 km/sec on the sky relative to the star, or, 1.3 arcsec/hr.
The 1-sigma error in the time of the event is 207 seconds.
The 1-sigma cross-track error in the shadow position is 2081 km.

The TNO has an absolute magnitude Hv=5.8
Diameter=416.9 km assuming a 5% albedo -- 31.4 sec chord
Diameter=170.2 km assuming a 30% albedo -- 12.8 sec chord
Dynamical classification is 11:4EEEEEEE
 
 
 
 
 
 
 
 

Star training set for 500879, (2018/07/19 07:59UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:32.8 -26:28:18  0.9 12.99  50
8Bet1Sco       16:06:31.1 -19:51:17  2.6  4.84  43
PPM 230971     15:57:36.1 -14:52:57  6.4  1.55  39
PPM 231074     16:02:04.9 -14:28:28  8.3  0.74  40
PPM 231140     16:04:52.0 -15:10:01  9.2  0.24  41
500879         16:04:00.0 -15:02:52 14.9        41
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 500879, (2018/07/19 07:59UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 12.99  50
8Bet1Sco       16:05:26.2 -19:48:20  2.6  4.84  43
PPM 230971     15:56:33.4 -14:49:47  6.4  1.55  39
PPM 231074     16:01:02.3 -14:25:24  8.3  0.74  40
PPM 231140     16:03:49.1 -15:07:01  9.2  0.24  41
500879         16:02:57.1 -14:59:51 14.9        41
Positions are for J2000

Event circumstances last updated at 2017/12/05 18:48:49 UT

Marc W. Buie, Southwest Research Institute

RECON