RECON: TNO occultation with 07LF38

Event between 07LF38 and star GA1020:04548453 with event index number of 1122850

Geocentric closest approach at 2021/07/22 14:36:26 UTC

J2000 position of star is 17:25:40.0 +13:10:30
Equinox of date position of star is 17:26:38.9 +13:09:27
Stellar brightness G=14.3, use SENSEUP=64 with the MallinCam and and exposure time of 1 seconds with the QHY174 camera.
Star is 43 degrees from the moon. Moon is 97% illuminated.
TNO apparent brightness V=23.3

TNO is 54.4 AU from the Sun and 53.8 AU from the Earth.
The TNO is moving 21.3 km/sec on the sky relative to the star, or, 2.0 arcsec/hr.
The 1-sigma error in the time of the event is 268 seconds.
The 1-sigma cross-track error in the shadow position is 4846 km.

The TNO has an absolute magnitude Hv=5.9
Diameter=400.0 km assuming a 5% albedo -- 18.8 sec chord
Diameter=163.3 km assuming a 30% albedo -- 7.7 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 07LF38, (2021/07/22 14:36UT)
Object            RA         Dec     mag  sep  mel
Vega           18:37:40.1 +38:48:17  0.0 30.08  64
Rasalhague     17:35:56.2 +12:32:45  2.1  2.34  42
PPM 133514     17:33:15.1 +11:54:57  6.4  2.03  41
PPM 133336     17:24:52.6 +13:04:53  8.5  0.44  43
PPM 133356     17:25:53.3 +13:18:59  9.8  0.25  43
PPM 133375     17:26:53.2 +13:07:21 10.2  0.07  43
07LF38         17:26:39.6 +13:09:26 14.3        43
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, (2021/07/22 14:36UT)
Object            RA         Dec     mag  sep  mel
Vega           18:36:56.7 +38:47:07  0.0 30.08  64
Rasalhague     17:34:56.3 +12:33:31  2.1  2.34  42
PPM 133514     17:32:14.8 +11:55:48  6.4  2.03  41
PPM 133336     17:23:53.0 +13:06:00  8.5  0.44  43
PPM 133356     17:24:53.7 +13:20:04  9.8  0.25  43
PPM 133375     17:25:53.6 +13:08:24 10.2  0.07  43
07LF38         17:25:40.0 +13:10:30 14.3        43
Positions are for J2000

Event circumstances last updated at 2021/04/19 23:04:07 UT

Marc W. Buie, Southwest Research Institute

RECON