RECON: TNO occultation with 15GY55

Event between 15GY55 and star GA0740:05250168 with event index number of 2100431

Geocentric closest approach at 2023/05/20 17:41:18 UTC

J2000 position of star is 14:42:28.3 -14:12:20
Equinox of date position of star is 14:43:40.0 -14:17:51
Stellar brightness G=14.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 150 degrees from the moon. Moon is 1% illuminated.
TNO apparent brightness V=22.8

TNO is 36.2 AU from the Sun and 35.2 AU from the Earth.
The TNO is moving 22.0 km/sec on the sky relative to the star, or, 3.1 arcsec/hr.
The 1-sigma error in the time of the event is 105 seconds.
The 1-sigma cross-track error in the shadow position is 1545 km.

The TNO has an absolute magnitude Hv=7.2
Diameter=207.0 km assuming a 5% albedo -- 9.8 sec chord
Diameter=84.5 km assuming a 30% albedo -- 4.0 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 15GY55, (2023/05/20 17:41UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:25.7 -11:16:57  1.0 19.09 132
27Bet Lib      15:18:16.1 -09:28:04  2.6  9.73 154
5 Lib          14:47:15.4 -15:33:24  6.5  1.51 151
PPM 229163     14:43:19.7 -13:57:10  8.2  0.37 150
PPM 229189     14:44:21.2 -14:22:27  9.5  0.16 150
15GY55         14:43:45.4 -14:18:15 14.7       150
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 15GY55, (2023/05/20 17:41UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 19.09 132
27Bet Lib      15:17:00.3 -09:22:59  2.6  9.73 154
5 Lib          14:45:57.7 -15:27:34  6.5  1.51 151
PPM 229163     14:42:02.8 -13:51:15  8.2  0.37 150
PPM 229189     14:43:04.1 -14:16:32  9.5  0.16 150
15GY55         14:42:28.3 -14:12:20 14.7       150
Positions are for J2000

Event circumstances last updated at 2021/10/07 00:43:09 UT

Marc W. Buie, Southwest Research Institute

RECON