Event between (278361) 07JJ43 and star GA0640:09754299 with event index number of 2180641
Geocentric closest approach at 2021/09/30 02:58:15 UTC
J2000 position of star is 16:59:11.5 -25:50:09
Equinox of date position of star is 17:00:31.7 -25:52:01
Stellar brightness G=13.5,
use SENSEUP=32 with the MallinCam and and exposure
time of 500 milli-seconds with the QHY174 camera.
Star is 148 degrees from the moon.
Moon is 40% illuminated.
TNO apparent brightness V=20.8
TNO is 40.8 AU from the Sun
and 41.1 AU from the Earth.
The TNO is moving 16.0
km/sec on the sky relative to the star, or,
1.9 arcsec/hr.
The 1-sigma error in the time of the event is 409 seconds.
The 1-sigma cross-track error in the shadow position is
1779 km.
The TNO has an absolute magnitude Hv=4.5
Diameter=758.6 km assuming a 5% albedo -- 47.5 sec chord
Diameter=309.7 km assuming a 30% albedo -- 19.4 sec chord
Dynamical classification is SCATNEAR
Star training set for 278361, (2021/09/30 02:58UT) Object RA Dec mag sep mel Antares 16:30:44.7 -26:28:42 0.9 6.71 141 23Tau Sco 16:37:14.4 -28:15:33 2.8 5.71 143 26 Oph 17:01:29.6 -25:01:13 5.8 0.87 148 PPM 266202 16:59:37.3 -26:05:27 7.4 0.30 147 PPM 266236 17:00:48.9 -25:43:51 9.2 0.15 148 278361 17:00:32.0 -25:52:02 13.5 148 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 278361, (2021/09/30 02:58UT) Object RA Dec mag sep mel Antares 16:29:24.4 -26:25:56 0.9 6.71 141 23Tau Sco 16:35:52.9 -28:12:58 2.8 5.71 143 26 Oph 17:00:09.6 -24:59:22 5.8 0.87 148 PPM 266202 16:58:16.7 -26:03:32 7.4 0.30 147 PPM 266236 16:59:28.5 -25:41:58 9.2 0.15 148 278361 16:59:11.5 -25:50:09 13.5 148 Positions are for J2000
Event circumstances last updated at 2021/08/29 01:39:51 UT
Marc W. Buie, Southwest Research Institute