RECON: TNO occultation with 307251

Event between (307251) 02KW14 and star GA0640:09910578 with event index number of 356703

Geocentric closest approach at 2019/05/15 21:57:15 UTC

J2000 position of star is 17:00:15.2 -25:32:57
Equinox of date position of star is 17:01:25.8 -25:34:35
Stellar brightness G=15.9, use SENSEUP=128
Star is 61 degrees from the moon. Moon is 89% illuminated.
TNO apparent brightness V=21.9

TNO is 42.4 AU from the Sun and 41.4 AU from the Earth.
The TNO is moving 22.6 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 284 seconds.
The 1-sigma cross-track error in the shadow position is 2292 km.

The TNO has an absolute magnitude Hv=5.6
Diameter=457.1 km assuming a 5% albedo -- 20.3 sec chord
Diameter=186.6 km assuming a 30% albedo -- 8.3 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 307251, (2019/05/15 21:57UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:35.9 -26:28:24  0.9  6.99  54
23Tau Sco      16:37:05.5 -28:15:16  2.8  6.05  56
26 Oph         17:01:20.9 -25:01:01  5.8  0.56  61
PPM 266286     17:02:38.8 -25:18:53  8.5  0.38  61
PPM 266253     17:01:28.0 -25:21:49  9.2  0.21  61
307251         17:01:26.8 -25:34:36 15.9        61
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 307251, (2019/05/15 21:57UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  6.99  54
23Tau Sco      16:35:53.0 -28:12:58  2.8  6.05  56
26 Oph         17:00:09.6 -24:59:22  5.8  0.56  61
PPM 266286     17:01:27.4 -25:17:16  8.5  0.38  61
PPM 266253     17:00:16.5 -25:20:09  9.2  0.21  61
307251         17:00:15.2 -25:32:57 15.9        61
Positions are for J2000

Event circumstances last updated at 2019/02/12 07:50:30 UT

Marc W. Buie, Southwest Research Institute

RECON