RECON: TNO occultation with 5145

Event between (5145) Pholus and star GA0760:15128087 with event index number of 1225809

Geocentric closest approach at 2023/04/28 13:16:55 UTC

J2000 position of star is 18:34:16.2 -12:59:50
Equinox of date position of star is 18:35:34.9 -12:58:39
Stellar brightness G=15.1, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 140 degrees from the moon. Moon is 56% illuminated.
Apparent brightness V=22.0

Object is 29.7 AU from the Sun and 29.2 AU from the Earth.
Apparent velocity is 11.1 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 224 seconds.
The 1-sigma cross-track error in the shadow position is 1643 km.

The object has an absolute magnitude Hv=7.1
Diameter=229.1 km assuming a 5% albedo -- 20.9 sec chord
Diameter=93.5 km assuming a 30% albedo -- 8.5 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 5145, (2023/04/28 13:17UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:50.5 -26:28:54  0.9 32.19 115
Nunki          18:56:42.6 -26:15:56  2.0 14.18 147
PPM 234707     18:34:59.0 -14:50:04  6.1  1.86 141
PPM 234724     18:35:34.7 -13:02:43  8.2  0.07 140
5145           18:35:35.0 -12:58:39 15.1       141
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 5145, (2023/04/28 13:17UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 32.19 115
Nunki          18:55:15.9 -26:17:49  2.0 14.18 147
PPM 234707     18:33:39.1 -14:51:14  6.1  1.86 141
PPM 234724     18:34:15.8 -13:03:54  8.2  0.07 140
5145           18:34:16.2 -12:59:50 15.1       140
Positions are for J2000

Event circumstances last updated at 2023/04/19 02:32:57 UT

Marc W. Buie, Southwest Research Institute

RECON