RECON: TNO occultation with 10BK118

Event between 10BK118 and star GA0340:23539397 with event index number of 250965

Geocentric closest approach at 2020/03/25 19:04:54 UTC

J2000 position of star is 15:41:43.1 -55:36:19
Equinox of date position of star is 15:43:17.7 -55:40:08
Stellar brightness G=16.4, use SENSEUP=128
Star is 121 degrees from the moon. Moon is 2% illuminated.
TNO apparent brightness V=22.8

TNO is 18.0 AU from the Sun and 17.6 AU from the Earth.
The TNO is moving 24.2 km/sec on the sky relative to the star, or, 6.8 arcsec/hr.
The 1-sigma error in the time of the event is 93 seconds.
The 1-sigma cross-track error in the shadow position is 2379 km.

The TNO has an absolute magnitude Hv=10.0
Diameter=55.5 km assuming a 5% albedo -- 2.5 sec chord
Diameter=22.6 km assuming a 30% albedo -- 1.0 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 10BK118, (2020/03/25 19:05UT)
Object            RA         Dec     mag  sep  mel
PPM 360911     14:40:59.3 -60:55:04  0.0  9.69 121
Bet TrA        15:56:56.6 -63:29:27  2.8  8.01 114
PPM 344263     15:51:39.8 -53:16:13  6.0  2.69 122
PPM 344017     15:40:02.6 -55:53:29  8.5  0.51 121
PPM 344119     15:45:20.0 -55:40:59  9.4  0.29 121
10BK118        15:43:17.9 -55:40:08 16.4       121
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 10BK118, (2020/03/25 19:05UT)
Object            RA         Dec     mag  sep  mel
PPM 360911     14:39:25.8 -60:49:53  0.0  9.69 121
Bet TrA        15:55:08.0 -63:25:58  2.8  8.01 114
PPM 344263     15:50:07.0 -53:12:36  6.0  2.69 122
PPM 344017     15:38:27.8 -55:49:35  8.5  0.51 121
PPM 344119     15:43:45.0 -55:37:13  9.4  0.29 121
10BK118        15:41:43.1 -55:36:19 16.4       121
Positions are for J2000

Event circumstances last updated at 2020/03/09 20:45:13 UT

Marc W. Buie, Southwest Research Institute

RECON