RECON: TNO occultation with 26375

Event between (26375) 99DE9 and star TYC25526-00776-1 with event index number of 203901

Geocentric closest approach at 2019/07/15 18:08:44 UTC

J2000 position of star is 12:22:12.1 -08:26:28
Equinox of date position of star is 12:23:06.6 -08:32:19
Stellar brightness V=12.6, use SENSEUP=16
Star is 92 degrees from the moon. Moon is 99% illuminated.
TNO apparent brightness V=21.0

TNO is 39.5 AU from the Sun and 39.7 AU from the Earth.
The TNO is moving 12.6 km/sec on the sky relative to the star, or, 1.6 arcsec/hr.
The 1-sigma error in the time of the event is 147 seconds.
The 1-sigma cross-track error in the shadow position is 1681 km.

The TNO has an absolute magnitude Hv=4.9
Diameter=631.0 km assuming a 5% albedo -- 49.9 sec chord
Diameter=257.6 km assuming a 30% albedo -- 20.4 sec chord
Dynamical classification is 5:2EEE
 
 
 
 
 
 
 
 

Star training set for 26375, (2019/07/15 18:09UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:13.5 -11:15:46  1.0 15.75  76
4Gam Crv       12:16:48.8 -17:39:01  2.6  9.23  89
PPM 225575     12:16:11.0 -10:25:34  6.1  2.55  92
PPM 195404     12:22:34.6 -09:30:30  8.4  0.97  91
PPM 195415     12:23:04.7 -08:39:57  8.9  0.12  92
26375          12:23:12.6 -08:32:57 12.6        91
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 26375, (2019/07/15 18:09UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 15.75  76
4Gam Crv       12:15:48.2 -17:32:31  2.6  9.23  89
PPM 225575     12:15:10.6 -10:19:03  6.1  2.55  92
PPM 195404     12:21:34.1 -09:24:00  8.4  0.97  91
PPM 195415     12:22:04.2 -08:33:27  8.9  0.12  92
26375          12:22:12.1 -08:26:28 12.6        92
Positions are for J2000

Event circumstances last updated at 2017/08/04 18:11:02 UT

Marc W. Buie, Southwest Research Institute

RECON