Event between (181855) 98WT31 and star GA1300:02457370 with event index number of 1106122
Geocentric closest approach at 2021/09/30 18:31:49 UTC
J2000 position of star is 05:10:39.7 +41:27:47
Equinox of date position of star is 05:12:11.3 +41:29:18
Stellar brightness G=17.0,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 38 degrees from the moon.
Moon is 34% illuminated.
TNO apparent brightness V=23.6
TNO is 37.6 AU from the Sun
and 37.3 AU from the Earth.
The TNO is moving 11.8
km/sec on the sky relative to the star, or,
1.6 arcsec/hr.
The 1-sigma error in the time of the event is 417 seconds.
The 1-sigma cross-track error in the shadow position is
5342 km.
The TNO has an absolute magnitude Hv=7.7
Diameter=173.8 km assuming a 5% albedo -- 14.8 sec chord
Diameter=70.9 km assuming a 30% albedo -- 6.0 sec chord
Dynamical classification is SCATEXTD
Star training set for 181855, (2021/09/30 18:35UT) Object RA Dec mag sep mel Aldebaran 04:37:10.3 +16:33:05 0.8 26.05 48 3Iot Aur 04:58:24.8 +33:11:55 2.7 8.73 40 10Eta Aur 05:08:02.6 +41:15:42 3.2 0.81 39 PPM 047827 05:13:46.3 +41:14:23 7.7 0.39 38 PPM 047795 05:12:09.6 +41:13:24 9.4 0.27 38 PPM 047792 05:12:01.3 +41:18:55 10.3 0.18 38 181855 05:12:11.7 +41:29:18 17.0 38 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 181855, (2021/09/30 18:35UT) Object RA Dec mag sep mel Aldebaran 04:35:55.3 +16:30:29 0.8 26.05 48 3Iot Aur 04:56:59.6 +33:09:58 2.7 8.73 40 10Eta Aur 05:06:30.9 +41:14:03 3.2 0.81 39 PPM 047827 05:12:14.5 +41:12:54 7.7 0.39 38 PPM 047795 05:10:37.9 +41:11:53 9.4 0.27 38 PPM 047792 05:10:29.5 +41:17:23 10.3 0.18 38 181855 05:10:39.7 +41:27:47 17.0 38 Positions are for J2000
Event circumstances last updated at 2021/08/29 01:39:54 UT
Marc W. Buie, Southwest Research Institute