RECON: TNO occultation with 26181

Event between (26181) 96GQ21 and star GA0780:05060227 with event index number of 286699

Geocentric closest approach at 2020/09/12 23:44:00 UTC

J2000 position of star is 16:06:41.4 -10:39:04
Equinox of date position of star is 16:07:49.2 -10:42:19
Stellar brightness G=12.1, use SENSEUP=16
Star is 129 degrees from the moon. Moon is 25% illuminated.
TNO apparent brightness V=26.7

TNO is 44.9 AU from the Sun and 45.2 AU from the Earth.
The TNO is moving 15.6 km/sec on the sky relative to the star, or, 1.7 arcsec/hr.
The 1-sigma error in the time of the event is 123 seconds.
The 1-sigma cross-track error in the shadow position is 1681 km.

The TNO has an absolute magnitude Hv=10.0
Diameter=691.9 km assuming a 5% albedo -- 3.9 sec chord
Diameter=282.4 km assuming a 30% albedo -- 1.6 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 26181, (2020/09/12 23:44UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:40.8 -26:28:34  0.9 16.67 139
1Del Oph       16:15:26.0 -03:44:46  2.7  7.21 128
15Psi Sco      16:13:08.1 -10:06:59  4.9  1.43 130
PPM 231210     16:07:43.9 -10:03:57  8.4  0.64 129
PPM 231215     16:07:51.2 -10:44:42  9.4  0.04 129
26181          16:07:49.6 -10:42:20 12.1       130
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 26181, (2020/09/12 23:44UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 16.67 139
1Del Oph       16:14:20.7 -03:41:42  2.7  7.21 128
15Psi Sco      16:12:00.0 -10:03:52  4.9  1.43 130
PPM 231210     16:06:35.9 -10:00:41  8.4  0.64 129
PPM 231215     16:06:42.9 -10:41:26  9.4  0.04 129
26181          16:06:41.4 -10:39:04 12.1       129
Positions are for J2000

Event circumstances last updated at 2020/07/30 22:01:58 UT

Marc W. Buie, Southwest Research Institute

RECON