RECON: TNO occultation with 470309

Event between (470309) 07JK43 and star GA0940:05899515 with event index number of 1057823

Geocentric closest approach at 2021/02/23 09:49:17 UTC

J2000 position of star is 18:02:21.8 +05:39:41
Equinox of date position of star is 18:03:23.7 +05:39:47
Stellar brightness G=14.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 145 degrees from the moon. Moon is 83% illuminated.
TNO apparent brightness V=21.5

TNO is 25.0 AU from the Sun and 25.3 AU from the Earth.
The TNO is moving 25.8 km/sec on the sky relative to the star, or, 5.1 arcsec/hr.
The 1-sigma error in the time of the event is 38 seconds.
The 1-sigma cross-track error in the shadow position is 973 km.

The TNO has an absolute magnitude Hv=7.3
Diameter=209.9 km assuming a 5% albedo -- 8.1 sec chord
Diameter=85.7 km assuming a 30% albedo -- 3.3 sec chord
Dynamical classification is CENTAURS
 
 
 
 
 
 
 
 

Star training set for 470309, (2021/02/23 09:49UT)
Object            RA         Dec     mag  sep  mel
Vega           18:37:39.3 +38:48:16  0.0 34.04 116
60Bet Oph      17:44:31.1 +04:33:36  2.8  4.83 144
PPM 164995     18:01:54.7 +06:16:09  6.4  0.71 145
PPM 165025     18:02:48.6 +05:19:30  9.9  0.37 146
PPM 165026     18:02:50.6 +05:34:59 10.4  0.16 145
470309         18:03:24.0 +05:39:47 14.5       145
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 470309, (2021/02/23 09:49UT)
Object            RA         Dec     mag  sep  mel
Vega           18:36:56.7 +38:47:07  0.0 34.04 116
60Bet Oph      17:43:28.3 +04:34:06  2.8  4.83 144
PPM 164995     18:00:52.8 +06:16:06  6.4  0.71 145
PPM 165025     18:01:46.2 +05:19:26  9.9  0.37 146
PPM 165026     18:01:48.3 +05:34:55 10.4  0.16 145
470309         18:02:21.8 +05:39:41 14.5       145
Positions are for J2000

Event circumstances last updated at 2021/01/18 21:47:47 UT

Marc W. Buie, Southwest Research Institute

RECON