Event between 99HH12 and star UC4-362-068567 with event index number of 82472
Geocentric closest approach at 2017/04/20 04:48:40 UTC
J2000 position of star is 15:00:55.3 -17:45:53
Equinox of date position of star is 15:01:53.8 -17:49:57
Stellar brightness R=15.7,
use SENSEUP=128
Star is 81 degrees from the moon.
Moon is 42% illuminated.
TNO apparent brightness V=23.3
TNO is 43.8 AU from the Sun
and 42.8 AU from the Earth.
The TNO is moving 23.6
km/sec on the sky relative to the star, or,
2.7 arcsec/hr.
The 1-sigma error in the time of the event is 289 seconds.
The 1-sigma cross-track error in the shadow position is
4111 km.
The TNO has an absolute magnitude Hv=6.9
Diameter=245.5 km assuming a 5% albedo -- 10.4 sec chord
Diameter=100.2 km assuming a 30% albedo -- 4.3 sec chord
Dynamical classification is CLASSICAL
Star training set for 99HH12, (2017/04/20 04:49UT) Object RA Dec mag sep mel Antares 16:30:28.2 -26:28:08 0.9 22.21 60 27Bet Lib 15:17:56.4 -09:26:45 2.6 9.25 80 21Nu Lib 15:07:35.7 -16:19:22 5.2 2.03 80 PPM 229686 15:04:05.0 -17:42:01 7.2 0.54 81 PPM 229610 15:01:01.1 -17:41:47 9.6 0.25 82 99HH12 15:01:53.8 -17:49:57 15.7 81 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 99HH12, (2017/04/20 04:49UT) Object RA Dec mag sep mel Antares 16:29:24.4 -26:25:55 0.9 22.21 60 27Bet Lib 15:17:00.3 -09:22:59 2.6 9.25 80 21Nu Lib 15:06:37.6 -16:15:25 5.2 2.03 80 PPM 229686 15:03:06.5 -17:38:00 7.2 0.54 81 PPM 229610 15:00:02.7 -17:37:42 9.6 0.25 82 99HH12 15:00:55.3 -17:45:53 15.7 81 Positions are for J2000
Event circumstances last updated at 2017/04/24 16:02:31 UT
Marc W. Buie, Southwest Research Institute