Event between 12LB27 and star GA0980:17209671 with event index number of 1793873
Geocentric closest approach at 2021/07/18 19:01:16 UTC
J2000 position of star is 20:25:22.7 +08:34:52
Equinox of date position of star is 20:26:24.8 +08:39:06
Stellar brightness G=16.7,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 86 degrees from the moon.
Moon is 66% illuminated.
TNO apparent brightness V=21.7
TNO is 15.7 AU from the Sun
and 14.8 AU from the Earth.
The TNO is moving 20.2
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 92 seconds.
The 1-sigma cross-track error in the shadow position is
637 km.
The TNO has an absolute magnitude Hv=9.7
Diameter=70.5 km assuming a 5% albedo -- 3.5 sec chord
Diameter=28.8 km assuming a 30% albedo -- 1.4 sec chord
Dynamical classification is CENTAURR
Star training set for 12LB27, (2021/07/18 19:01UT) Object RA Dec mag sep mel Vega 18:37:40.1 +38:48:17 0.0 38.78 75 Tarazed 19:47:17.0 +10:40:02 2.7 9.85 77 PPM 170088 20:29:10.4 +08:30:36 6.3 0.69 87 PPM 169970 20:25:41.1 +08:40:06 7.0 0.18 86 PPM 169994 20:26:20.6 +08:38:52 10.8 0.02 86 12LB27 20:26:25.5 +08:39:09 16.7 86 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 12LB27, (2021/07/18 19:01UT) Object RA Dec mag sep mel Vega 18:36:56.7 +38:47:07 0.0 38.78 75 Tarazed 19:46:15.6 +10:36:48 2.7 9.85 77 PPM 170088 20:28:07.6 +08:26:15 6.3 0.69 87 PPM 169970 20:24:38.3 +08:35:51 7.0 0.18 86 PPM 169994 20:25:17.9 +08:34:35 10.8 0.02 86 12LB27 20:25:22.7 +08:34:52 16.7 86 Positions are for J2000
Event circumstances last updated at 2021/04/21 22:33:01 UT
Marc W. Buie, Southwest Research Institute