RECON: TNO occultation with 456826

Event between (456826) 07TH422 and star UC4-535-017480 with event index number of 207921

Geocentric closest approach at 2019/08/29 01:17:42 UTC

J2000 position of star is 05:42:57.0 +16:50:42
Equinox of date position of star is 05:43:59.4 +16:51:08
Stellar brightness R=15.8, use SENSEUP=128
Star is 51 degrees from the moon. Moon is 3% illuminated.
TNO apparent brightness V=22.6

TNO is 29.5 AU from the Sun and 29.8 AU from the Earth.
The TNO is moving 15.4 km/sec on the sky relative to the star, or, 2.6 arcsec/hr.
The 1-sigma error in the time of the event is 324 seconds.
The 1-sigma cross-track error in the shadow position is 3125 km.

The TNO has an absolute magnitude Hv=7.7
Diameter=173.8 km assuming a 5% albedo -- 11.3 sec chord
Diameter=70.9 km assuming a 30% albedo -- 4.6 sec chord
Dynamical classification is 3:2E+6:4II
 
 
 
 
 
 
 
 

Star training set for 456826, (2019/08/29 01:18UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:14.2 +07:24:33  0.4  9.90  50
Bellatrix      05:26:11.2 +06:21:57  1.6 11.36  57
126 Tau        05:42:25.9 +16:32:33  4.6  0.50  51
PPM 121255     05:41:56.8 +17:12:17  8.4  0.62  51
PPM 121273     05:42:46.6 +17:05:13  9.9  0.39  51
456826         05:44:05.4 +16:51:10 15.8        50
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 456826, (2019/08/29 01:18UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  9.90  50
Bellatrix      05:25:07.8 +06:20:58  1.6 11.36  57
126 Tau        05:41:17.7 +16:32:02  4.6  0.50  51
PPM 121255     05:40:48.3 +17:11:45  8.4  0.62  51
PPM 121273     05:41:38.1 +17:04:42  9.9  0.39  51
456826         05:42:57.0 +16:50:42 15.8        51
Positions are for J2000

Event circumstances last updated at 2017/12/06 19:14:28 UT

Marc W. Buie, Southwest Research Institute

RECON