RECON: TNO occultation with 26181

Event between (26181) 96GQ21 and star UC4-399-060420 with event index number of 128097

Geocentric closest approach at 2018/07/04 16:21:07 UTC

J2000 position of star is 15:55:25.9 -10:20:45
Equinox of date position of star is 15:56:21.0 -10:23:38
Stellar brightness R=14.7
Star is 115 degrees from the moon. Moon is 66% illuminated.
TNO apparent brightness V=21.7

TNO is 44.1 AU from the Sun and 43.4 AU from the Earth.
The TNO is moving 16.2 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 193 seconds.
The 1-sigma cross-track error in the shadow position is 1580 km.

The TNO has an absolute magnitude Hv=5.2
Diameter=549.6 km assuming a 5% albedo -- 38.9 sec chord
Diameter=224.4 km assuming a 30% albedo -- 15.9 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 26181, (2018/07/04 16:21UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:32.7 -26:28:17  0.9 17.98 103
1Del Oph       16:15:19.0 -03:44:26  2.7  8.14 111
50 Lib         16:01:47.7 -08:27:45  5.5  2.34 114
PPM 230996     15:58:08.9 -10:56:26  7.9  0.68 114
PPM 230923     15:55:15.7 -10:06:16  9.6  0.41 115
26181          15:56:26.7 -10:23:56 14.7       115
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, (2018/07/04 16:21UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:55  0.9 17.98 103
1Del Oph       16:14:20.7 -03:41:42  2.7  8.14 111
50 Lib         16:00:47.6 -08:24:41  5.5  2.34 114
PPM 230996     15:57:07.9 -10:53:17  7.9  0.68 114
PPM 230923     15:54:15.1 -10:03:03  9.6  0.41 115
26181          15:55:25.9 -10:20:45 14.7       115
Positions are for J2000

Event circumstances last updated at 2016/10/09 17:28:41 UT

Marc W. Buie, Southwest Research Institute

RECON