RECON: TNO occultation with 278361

Event between (278361) 07JJ43 and star UC4-319-087467 with event index number of 83005

Geocentric closest approach at 2017/09/28 06:55:23 UTC

J2000 position of star is 16:33:09.6 -26:15:24
Equinox of date position of star is 16:34:13.7 -26:17:32
Stellar brightness R=15.1, use SENSEUP=128
Star is 28 degrees from the moon. Moon is 52% illuminated.
TNO apparent brightness V=20.8

TNO is 41.0 AU from the Sun and 41.5 AU from the Earth.
The TNO is moving 17.9 km/sec on the sky relative to the star, or, 2.1 arcsec/hr.
The 1-sigma error in the time of the event is 176 seconds.
The 1-sigma cross-track error in the shadow position is 1553 km.

The TNO has an absolute magnitude Hv=4.5
Diameter=758.6 km assuming a 5% albedo -- 42.3 sec chord
Diameter=309.7 km assuming a 30% albedo -- 17.3 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 278361, (2017/09/28 06:55UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:29.9 -26:28:12  0.9  0.86  29
23Tau Sco      16:36:59.4 -28:15:05  2.8  2.05  28
PPM 265618     16:32:28.4 -26:34:29  6.1  0.49  28
PPM 265637     16:32:59.1 -26:02:54  8.4  0.38  28
PPM 265649     16:33:34.3 -26:10:31  9.4  0.19  28
278361         16:34:15.1 -26:17:35 15.1        28
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 278361, (2017/09/28 06:55UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  0.86  29
23Tau Sco      16:35:53.0 -28:12:58  2.8  2.05  28
PPM 265618     16:31:22.9 -26:32:16  6.1  0.49  28
PPM 265637     16:31:53.8 -26:00:41  8.4  0.38  28
PPM 265649     16:32:28.9 -26:08:19  9.4  0.19  28
278361         16:33:09.6 -26:15:24 15.1        28
Positions are for J2000

Event circumstances last updated at 2017/05/16 18:33:13 UT

Marc W. Buie, Southwest Research Institute

RECON