RECON: TNO occultation with 04PB108

Event between 04PB108 and star GA0780:00033766 with event index number of 1695541

Geocentric closest approach at 2021/10/24 01:13:05 UTC

J2000 position of star is 00:24:36.9 -10:29:52
Equinox of date position of star is 00:25:43.2 -10:22:39
Stellar brightness G=13.7, use SENSEUP=64 with the MallinCam and and exposure time of 1 seconds with the QHY174 camera.
Star is 68 degrees from the moon. Moon is 90% illuminated.
TNO apparent brightness V=22.8

TNO is 42.1 AU from the Sun and 41.2 AU from the Earth.
The TNO is moving 21.5 km/sec on the sky relative to the star, or, 2.6 arcsec/hr.
The 1-sigma error in the time of the event is 499 seconds.
The 1-sigma cross-track error in the shadow position is 2521 km.

The TNO has an absolute magnitude Hv=6.5
Diameter=303.4 km assuming a 5% albedo -- 14.1 sec chord
Diameter=123.9 km assuming a 30% albedo -- 5.8 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 04PB108, (2021/10/24 01:13UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:51.1 -29:30:22  1.2 27.87  95
Diphda         00:44:41.0 -17:52:02  2.0  8.79  68
9 Cet          00:23:58.8 -12:05:18  6.4  1.76  69
PPM 182267     00:28:13.4 -09:45:10  7.6  0.88  67
PPM 208746     00:25:14.9 -10:28:40  9.5  0.15  68
04PB108        00:25:43.4 -10:22:37 13.7        67
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 04PB108, (2021/10/24 01:13UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.6 -29:37:24  1.2 27.87  95
Diphda         00:43:35.7 -17:59:11  2.0  8.79  68
9 Cet          00:22:52.3 -12:12:33  6.4  1.76  69
PPM 182267     00:27:06.9 -09:52:24  7.6  0.88  67
PPM 208746     00:24:08.5 -10:35:55  9.5  0.15  68
04PB108        00:24:36.9 -10:29:52 13.7        68
Positions are for J2000

Event circumstances last updated at 2021/10/02 02:24:29 UT

Marc W. Buie, Southwest Research Institute

RECON