RECON: TNO occultation with 470308

Event between (470308) 07JH43 and star GA0640:08608633 with event index number of 1054724

Geocentric closest approach at 2021/02/17 20:44:34 UTC

J2000 position of star is 16:48:18.1 -24:58:44
Equinox of date position of star is 16:49:35.3 -25:00:53
Stellar brightness G=16.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 144 degrees from the moon. Moon is 32% illuminated.
TNO apparent brightness V=20.8

TNO is 40.6 AU from the Sun and 40.8 AU from the Earth.
The TNO is moving 12.7 km/sec on the sky relative to the star, or, 1.5 arcsec/hr.
The 1-sigma error in the time of the event is 148 seconds.
The 1-sigma cross-track error in the shadow position is 1745 km.

The TNO has an absolute magnitude Hv=4.5
Diameter=758.6 km assuming a 5% albedo -- 59.9 sec chord
Diameter=309.7 km assuming a 30% albedo -- 24.5 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 470308, (2021/02/17 20:45UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:42.4 -26:28:38  0.9  4.50 148
23Tau Sco      16:37:12.1 -28:15:29  2.8  4.26 146
26 Oph         17:01:27.3 -25:01:10  5.8  2.69 142
PPM 266013     16:50:52.8 -25:06:25  7.6  0.31 144
PPM 265986     16:49:36.5 -24:59:12  9.3  0.03 144
470308         16:49:35.6 -25:00:53 16.9       144
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 470308, (2021/02/17 20:45UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  4.50 148
23Tau Sco      16:35:52.9 -28:12:58  2.8  4.26 146
26 Oph         17:00:09.6 -24:59:22  5.8  2.69 142
PPM 266013     16:49:35.2 -25:04:18  7.6  0.31 144
PPM 265986     16:48:19.0 -24:57:03  9.3  0.03 144
470308         16:48:18.1 -24:58:44 16.9       144
Positions are for J2000

Event circumstances last updated at 2021/01/18 21:38:53 UT

Marc W. Buie, Southwest Research Institute

RECON