RECON: TNO occultation with 04OQ15

Event between 04OQ15 and star GA0680:36266552 with event index number of 201321

Geocentric closest approach at 2019/07/27 03:13:09 UTC

J2000 position of star is 20:58:34.5 -20:45:56
Equinox of date position of star is 20:59:41.2 -20:41:22
Stellar brightness G=15.6, use SENSEUP=128
Star is 107 degrees from the moon. Moon is 30% illuminated.
TNO apparent brightness V=23.0

TNO is 39.1 AU from the Sun and 38.1 AU from the Earth.
The TNO is moving 24.2 km/sec on the sky relative to the star, or, 3.1 arcsec/hr.
The 1-sigma error in the time of the event is 293 seconds.
The 1-sigma cross-track error in the shadow position is 3003 km.

The TNO has an absolute magnitude Hv=7.1
Diameter=227.0 km assuming a 5% albedo -- 9.4 sec chord
Diameter=92.7 km assuming a 30% albedo -- 3.8 sec chord
Dynamical classification is 7:4EEE
 
 
 
 
 
 
 
 

Star training set for 04OQ15, (2019/07/27 03:13UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:43.7 -29:31:05  1.2 28.26  83
38Zet Sgr      19:03:51.3 -29:51:02  2.7 27.65 133
22Eta Cap      21:05:30.9 -19:46:36  4.8  1.64 105
PPM 271792     20:55:51.0 -20:52:27  8.3  0.92 108
PPM 271881     21:00:08.4 -21:00:31  9.5  0.34 107
04OQ15         20:59:41.7 -20:41:20 15.6       106
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 04OQ15, (2019/07/27 03:13UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.5 -29:37:23  1.2 28.26  83
38Zet Sgr      19:02:36.7 -29:52:49  2.7 27.65 133
22Eta Cap      21:04:24.3 -19:51:20  4.8  1.64 105
PPM 271792     20:54:43.6 -20:56:58  8.3  0.92 108
PPM 271881     20:59:01.1 -21:05:08  9.5  0.34 107
04OQ15         20:58:34.5 -20:45:56 15.6       107
Positions are for J2000

Event circumstances last updated at 2019/06/07 22:28:12 UT

Marc W. Buie, Southwest Research Institute

RECON