RECON: TNO occultation with 83982

Event between (83982) Crantor and star UC4-348-191484 with event index number of 132354

Geocentric closest approach at 2018/07/18 21:59:39 UTC

J2000 position of star is 20:56:13.1 -20:24:08
Equinox of date position of star is 20:57:14.6 -20:19:58
Stellar brightness R=16.2, use SENSEUP=128
Star is 116 degrees from the moon. Moon is 40% illuminated.
TNO apparent brightness V=21.5

TNO is 18.8 AU from the Sun and 17.8 AU from the Earth.
The TNO is moving 21.9 km/sec on the sky relative to the star, or, 6.1 arcsec/hr.
The 1-sigma error in the time of the event is 180 seconds.
The 1-sigma cross-track error in the shadow position is 1662 km.

The TNO has an absolute magnitude Hv=8.8
Diameter=104.7 km assuming a 5% albedo -- 4.8 sec chord
Diameter=42.8 km assuming a 30% albedo -- 2.0 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 83982, (2018/07/18 22:00UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:40.3 -29:31:25  1.2 28.91 137
38Zet Sgr      19:03:47.4 -29:51:07  2.7 27.31  89
22Eta Cap      21:05:27.5 -19:46:51  4.8  2.00 118
PPM 271792     20:55:47.5 -20:52:41  8.3  0.65 115
PPM 271825     20:57:31.7 -20:30:43  9.5  0.19 116
83982          20:57:16.8 -20:19:49 16.2       116
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 83982, (2018/07/18 22:00UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.5 -29:37:23  1.2 28.91 137
38Zet Sgr      19:02:36.7 -29:52:49  2.7 27.31  89
22Eta Cap      21:04:24.3 -19:51:20  4.8  2.00 118
PPM 271792     20:54:43.6 -20:56:58  8.3  0.65 115
PPM 271825     20:56:28.0 -20:35:02  9.5  0.19 116
83982          20:56:13.1 -20:24:08 16.2       116
Positions are for J2000

Event circumstances last updated at 2017/12/05 18:48:46 UT

Marc W. Buie, Southwest Research Institute

RECON