RECON: TNO occultation with 501546

Event between (501546) 14JJ80 and star GA0940:16752694 with event index number of 255822

Geocentric closest approach at 2020/04/20 20:56:14 UTC

J2000 position of star is 21:45:15.5 +04:34:34
Equinox of date position of star is 21:46:14.1 +04:39:58
Stellar brightness G=16.8, use SENSEUP=128
Star is 42 degrees from the moon. Moon is 5% illuminated.
TNO apparent brightness V=20.8

TNO is 32.2 AU from the Sun and 32.7 AU from the Earth.
The TNO is moving 22.3 km/sec on the sky relative to the star, or, 3.4 arcsec/hr.
The 1-sigma error in the time of the event is 138 seconds.
The 1-sigma cross-track error in the shadow position is 3122 km.

The TNO has an absolute magnitude Hv=5.5
Diameter=478.6 km assuming a 5% albedo -- 21.5 sec chord
Diameter=195.4 km assuming a 30% albedo -- 8.8 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 501546, (2020/04/20 20:56UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:46.1 -29:30:51  1.2 38.35  36
Markab         23:05:46.4 +15:18:53  2.5 22.25  28
11 Peg         21:48:15.7 +02:46:51  5.6  1.95  42
PPM 172245     21:48:11.7 +04:29:51  8.5  0.51  42
PPM 172202     21:45:51.1 +04:24:30 10.0  0.28  43
PPM 172209     21:46:05.0 +04:40:11 10.8  0.05  42
501546         21:46:16.8 +04:40:13 16.8        42
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 501546, (2020/04/20 20:56UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.5 -29:37:23  1.2 38.35  36
Markab         23:04:45.7 +15:12:18  2.5 22.25  28
11 Peg         21:47:14.0 +02:41:10  5.6  1.95  42
PPM 172245     21:47:10.4 +04:24:10  8.5  0.51  42
PPM 172202     21:44:49.8 +04:18:51 10.0  0.28  43
PPM 172209     21:45:03.8 +04:34:32 10.8  0.05  42
501546         21:45:15.5 +04:34:34 16.8        42
Positions are for J2000

Event circumstances last updated at 2019/06/07 23:29:41 UT

Marc W. Buie, Southwest Research Institute

RECON