RECON: TNO occultation with 07LF38

Event between 07LF38 and star GA1020:04542694 with event index number of 1122851

Geocentric closest approach at 2021/08/03 19:07:04 UTC

J2000 position of star is 17:25:09.0 +13:05:24
Equinox of date position of star is 17:26:08.0 +13:04:20
Stellar brightness G=14.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 143 degrees from the moon. Moon is 21% illuminated.
TNO apparent brightness V=23.3

TNO is 54.4 AU from the Sun and 53.9 AU from the Earth.
The TNO is moving 19.4 km/sec on the sky relative to the star, or, 1.8 arcsec/hr.
The 1-sigma error in the time of the event is 274 seconds.
The 1-sigma cross-track error in the shadow position is 5286 km.

The TNO has an absolute magnitude Hv=5.9
Diameter=400.0 km assuming a 5% albedo -- 20.7 sec chord
Diameter=163.3 km assuming a 30% albedo -- 8.4 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 07LF38, (2021/08/03 19:07UT)
Object            RA         Dec     mag  sep  mel
Vega           18:37:40.2 +38:48:17  0.0 30.21 114
Rasalhague     17:35:56.3 +12:32:45  2.1  2.44 143
PPM 133514     17:33:15.2 +11:54:57  6.4  2.08 144
PPM 133336     17:24:52.7 +13:04:53  8.5  0.31 143
PPM 133356     17:25:53.4 +13:18:59  9.8  0.25 143
PPM 133374     17:26:52.3 +13:01:41 10.8  0.18 143
07LF38         17:26:08.8 +13:04:20 14.7       143
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 07LF38, (2021/08/03 19:07UT)
Object            RA         Dec     mag  sep  mel
Vega           18:36:56.7 +38:47:07  0.0 30.21 114
Rasalhague     17:34:56.3 +12:33:31  2.1  2.44 143
PPM 133514     17:32:14.8 +11:55:48  6.4  2.08 144
PPM 133336     17:23:53.0 +13:06:00  8.5  0.31 143
PPM 133356     17:24:53.7 +13:20:04  9.8  0.25 143
PPM 133374     17:25:52.5 +13:02:44 10.8  0.18 143
07LF38         17:25:09.0 +13:05:24 14.7       143
Positions are for J2000

Event circumstances last updated at 2021/04/19 23:04:13 UT

Marc W. Buie, Southwest Research Institute

RECON