RECON: TNO occultation with 174567

Event between (174567) Varda and star GA0880:05766122 with event index number of 1105913

Geocentric closest approach at 2021/06/23 20:20:23 UTC

J2000 position of star is 17:35:07.5 -01:39:41
Equinox of date position of star is 17:36:12.8 -01:40:26
Stellar brightness G=16.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 23 degrees from the moon. Moon is 99% illuminated.
TNO apparent brightness V=20.1

TNO is 46.3 AU from the Sun and 45.4 AU from the Earth.
The TNO is moving 24.7 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 67 seconds.
The 1-sigma cross-track error in the shadow position is 1646 km.

The TNO has an absolute magnitude Hv=3.4
Diameter=1259.0 km assuming a 5% albedo -- 51.0 sec chord
Diameter=514.0 km assuming a 30% albedo -- 20.8 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 174567, (2021/06/23 20:20UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:43.7 -26:28:40  0.9 29.37  10
60Bet Oph      17:44:32.1 +04:33:36  2.8  6.57  29
PPM 180083     17:31:30.2 -01:04:44  6.2  1.32  23
PPM 180105     17:35:59.5 -01:37:05  8.1  0.08  23
174567         17:36:14.3 -01:40:27 16.9        23
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 174567, (2021/06/23 20:20UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 29.37  10
60Bet Oph      17:43:28.3 +04:34:06  2.8  6.57  29
PPM 180083     17:30:23.6 -01:03:50  6.2  1.32  23
PPM 180105     17:34:52.7 -01:36:19  8.1  0.08  23
174567         17:35:07.5 -01:39:41 16.9        23
Positions are for J2000

Event circumstances last updated at 2020/12/20 23:58:28 UT

Marc W. Buie, Southwest Research Institute

RECON