RECON: TNO occultation with 612161

Event between (612161) 00KK4 and star GA0820:09058611 with event index number of 2807938

Geocentric closest approach at 2027/05/03 19:44:56 UTC

J2000 position of star is 18:17:26.7 -07:45:00
Equinox of date position of star is 18:18:39.4 -07:44:24
Stellar brightness G=16.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 94 degrees from the moon. Moon is 8% illuminated.
TNO apparent brightness V=22.8

TNO is 44.7 AU from the Sun and 44.1 AU from the Earth.
The TNO is moving 14.8 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 1064 seconds.
The 1-sigma cross-track error in the shadow position is 3523 km.

The TNO has an absolute magnitude Hv=6.2
Diameter=338.9 km assuming a 5% albedo -- 22.8 sec chord
Diameter=138.3 km assuming a 30% albedo -- 9.3 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 612161, (2027/05/03 19:45UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:05.3 -26:29:25  0.9 31.73 120
60Bet Oph      17:44:49.5 +04:33:28  2.8 14.95 101
PPM 201730     18:26:10.9 -07:03:33  6.5  1.92  92
PPM 201574     18:18:51.3 -07:16:28  8.5  0.46  94
PPM 201581     18:19:08.3 -07:26:23  9.5  0.30  94
612161         18:18:55.7 -07:44:16 16.9        94
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 612161, (2027/05/03 19:45UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 31.73 120
60Bet Oph      17:43:28.3 +04:34:06  2.8 14.95 101
PPM 201730     18:24:42.4 -07:04:34  6.5  1.92  92
PPM 201574     18:17:22.6 -07:17:11  8.5  0.46  94
PPM 201581     18:17:39.5 -07:27:07  9.5  0.30  94
612161         18:17:26.7 -07:45:00 16.9        94
Positions are for J2000

Event circumstances last updated at 2022/05/07 22:10:34 UT

Marc W. Buie, Southwest Research Institute

RECON