RECON: TNO occultation with 04VZ75

Event between 04VZ75 and star GA1080:01015314 with event index number of 1532060

Geocentric closest approach at 2019/10/24 15:37:59 UTC

J2000 position of star is 05:25:34.2 +18:39:33
Equinox of date position of star is 05:26:42.0 +18:40:30
Stellar brightness G=15.9, use SENSEUP=128
Star is 81 degrees from the moon. Moon is 17% illuminated.
TNO apparent brightness V=23.1

TNO is 39.4 AU from the Sun and 38.8 AU from the Earth.
The TNO is moving 14.6 km/sec on the sky relative to the star, or, 1.9 arcsec/hr.
The 1-sigma error in the time of the event is 441 seconds.
The 1-sigma cross-track error in the shadow position is 2856 km.

The TNO has an absolute magnitude Hv=7.1
Diameter=234.4 km assuming a 5% albedo -- 16.1 sec chord
Diameter=95.7 km assuming a 30% albedo -- 6.6 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 04VZ75, (2019/10/24 15:38UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:03.6 +16:32:51  0.8 12.02  93
Alnath         05:27:32.8 +28:37:20  1.6  9.95  79
115 Tau        05:28:19.5 +17:58:39  5.4  0.79  81
PPM 120969     05:28:38.7 +18:30:46  8.5  0.48  80
PPM 120917     05:25:20.0 +19:01:14  8.7  0.48  81
PPM 120928     05:25:59.4 +18:29:14 10.1  0.26  81
04VZ75         05:26:44.0 +18:40:31 15.9        81
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 04VZ75, (2019/10/24 15:38UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 12.02  93
Alnath         05:26:17.5 +28:36:23  1.6  9.95  79
115 Tau        05:27:10.1 +17:57:43  5.4  0.79  81
PPM 120969     05:27:29.0 +18:29:51  8.5  0.48  80
PPM 120917     05:24:10.1 +19:00:13  8.7  0.48  81
PPM 120928     05:24:49.7 +18:28:14 10.1  0.26  81
04VZ75         05:25:34.2 +18:39:33 15.9        81
Positions are for J2000

Event circumstances last updated at 2019/04/01 22:04:57 UT

Marc W. Buie, Southwest Research Institute

RECON