RECON: TNO occultation with 04LR31

Event between 04LR31 and star UC4-421-142109 with event index number of 211052

Geocentric closest approach at 2019/09/04 23:09:57 UTC

J2000 position of star is 23:05:07.0 -05:59:25
Equinox of date position of star is 23:06:02.7 -05:53:36
Stellar brightness R=14.8, use SENSEUP=128
Star is 107 degrees from the moon. Moon is 38% illuminated.
TNO apparent brightness V=21.6

TNO is 18.0 AU from the Sun and 17.0 AU from the Earth.
The TNO is moving 22.7 km/sec on the sky relative to the star, or, 6.7 arcsec/hr.
The 1-sigma error in the time of the event is 58 seconds.
The 1-sigma cross-track error in the shadow position is 817 km.

The TNO has an absolute magnitude Hv=9.2
Diameter=86.7 km assuming a 5% albedo -- 3.8 sec chord
Diameter=35.4 km assuming a 30% albedo -- 1.6 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 04LR31, (2019/09/04 23:10UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:44.0 -29:31:03  1.2 23.70  97
Markab         23:05:44.6 +15:18:41  2.5 21.20 113
82 Aqr         23:03:33.8 -06:28:05  6.0  0.87 106
PPM 207114     23:05:24.0 -06:35:00  7.8  0.72 107
PPM 207115     23:05:29.1 -06:04:23  8.6  0.25 107
04LR31         23:06:08.2 -05:53:02 14.8       108
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, (2019/09/04 23:10UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.5 -29:37:23  1.2 23.70  97
Markab         23:04:45.7 +15:12:18  2.5 21.20 113
82 Aqr         23:02:32.5 -06:34:27  6.0  0.87 106
PPM 207114     23:04:22.8 -06:41:23  7.8  0.72 107
PPM 207115     23:04:27.9 -06:10:46  8.6  0.25 107
04LR31         23:05:07.0 -05:59:25 14.8       107
Positions are for J2000

Event circumstances last updated at 2017/12/06 19:15:21 UT

Marc W. Buie, Southwest Research Institute

RECON