RECON: TNO occultation with 174567

Event between (174567) Varda and star GA0880:06690162 with event index number of 2167223

Geocentric closest approach at 2027/08/20 11:43:45 UTC

J2000 position of star is 17:59:42.0 -01:41:33
Equinox of date position of star is 18:00:57.3 -01:41:32
Stellar brightness G=15.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 91 degrees from the moon. Moon is 91% illuminated.
Apparent brightness V=20.2

Object is 45.5 AU from the Sun and 45.0 AU from the Earth.
Apparent velocity is 14.6 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 194 seconds.
The 1-sigma cross-track error in the shadow position is 3501 km.

The object has an absolute magnitude Hv=3.5
Diameter=1259.0 km assuming a 5% albedo -- 83.6 sec chord
Diameter=514.0 km assuming a 30% albedo -- 34.1 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 174567, (2027/08/20 11:44UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:06.4 -26:29:27  0.9 32.90 113
60Bet Oph      17:44:50.3 +04:33:27  2.8  7.46  94
PPM 164879     17:58:29.3 +00:03:54  5.9  1.88  91
PPM 180223     18:04:13.3 -01:20:03  8.2  0.85  90
PPM 180216     18:01:40.6 -01:41:28  9.3  0.14  91
174567         18:01:08.1 -01:41:32 15.6        90
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, (2027/08/20 11:44UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 32.90 113
60Bet Oph      17:43:28.3 +04:34:06  2.8  7.46  94
PPM 164879     17:57:04.3 +00:03:59  5.9  1.88  91
PPM 180223     18:02:47.4 -01:20:12  8.2  0.85  90
PPM 180216     18:00:14.6 -01:41:30  9.3  0.14  91
174567         17:59:42.0 -01:41:33 15.6        91
Positions are for J2000

Event circumstances last updated at 2024/02/28 22:13:31 UT

Marc W. Buie, Southwest Research Institute

RECON