RECON: TNO occultation with 04LR31

Event between 04LR31 and star UC4-421-141625 with event index number of 162039

Geocentric closest approach at 2018/08/04 15:58:18 UTC

J2000 position of star is 22:48:55.5 -05:53:45
Equinox of date position of star is 22:49:51.3 -05:48:03
Stellar brightness R=14.6, use SENSEUP=128
Star is 60 degrees from the moon. Moon is 51% illuminated.
TNO apparent brightness V=21.7

TNO is 17.5 AU from the Sun and 16.7 AU from the Earth.
The TNO is moving 18.8 km/sec on the sky relative to the star, or, 5.6 arcsec/hr.
The 1-sigma error in the time of the event is 69 seconds.
The 1-sigma cross-track error in the shadow position is 769 km.

The TNO has an absolute magnitude Hv=9.2
Diameter=86.7 km assuming a 5% albedo -- 4.6 sec chord
Diameter=35.4 km assuming a 30% albedo -- 1.9 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 04LR31, (2018/08/04 15:58UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:40.4 -29:31:24  1.2 23.82  67
Markab         23:05:41.3 +15:18:20  2.5 21.46  53
67 Aqr         22:44:12.5 -06:51:54  6.4  1.77  62
PPM 206793     22:49:15.7 -05:40:08  8.3  0.20  60
04LR31         22:49:53.4 -05:47:50 14.6        60
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 04LR31, (2018/08/04 15:58UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.5 -29:37:23  1.2 23.82  67
Markab         23:04:45.7 +15:12:18  2.5 21.46  53
67 Aqr         22:43:14.3 -06:57:47  6.4  1.77  62
PPM 206793     22:48:17.8 -05:46:03  8.3  0.20  60
04LR31         22:48:55.5 -05:53:45 14.6        60
Positions are for J2000

Event circumstances last updated at 2017/12/05 18:51:23 UT

Marc W. Buie, Southwest Research Institute

RECON