RECON: TNO occultation with 15BT518

Event between 15BT518 and star GA0820:04548205 with event index number of 1061516

Geocentric closest approach at 2021/03/17 02:07:32 UTC

J2000 position of star is 14:36:03.8 -07:30:31
Equinox of date position of star is 14:37:10.9 -07:35:58
Stellar brightness G=16.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 175 degrees from the moon. Moon is 12% illuminated.
TNO apparent brightness V=22.2

TNO is 42.4 AU from the Sun and 41.7 AU from the Earth.
The TNO is moving 17.3 km/sec on the sky relative to the star, or, 2.1 arcsec/hr.
The 1-sigma error in the time of the event is 168 seconds.
The 1-sigma cross-track error in the shadow position is 2701 km.

The TNO has an absolute magnitude Hv=5.9
Diameter=405.5 km assuming a 5% albedo -- 23.5 sec chord
Diameter=165.6 km assuming a 30% albedo -- 9.6 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 15BT518, (2021/03/17 02:08UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:18.8 -11:16:17  1.0 17.86 165
27Bet Lib      15:18:09.1 -09:27:36  2.6 10.30 167
107Mu Vir      14:44:10.8 -05:44:57  3.9  2.54 173
PPM 197767     14:39:43.1 -07:15:15  8.2  0.72 175
PPM 197727     14:37:38.5 -07:31:57  9.3  0.13 175
15BT518        14:37:11.4 -07:36:00 16.0       175
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 15BT518, (2021/03/17 02:08UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 17.86 165
27Bet Lib      15:17:00.3 -09:22:59  2.6 10.30 167
107Mu Vir      14:43:03.8 -05:39:36  3.9  2.54 173
PPM 197767     14:38:35.6 -07:09:48  8.2  0.72 175
PPM 197727     14:36:31.0 -07:26:28  9.3  0.13 175
15BT518        14:36:03.8 -07:30:31 16.0       175
Positions are for J2000

Event circumstances last updated at 2021/01/19 21:13:48 UT

Marc W. Buie, Southwest Research Institute

RECON