RECON: TNO occultation with 225088

Event between (225088) Gonggong and star GA0800:21760193 with event index number of 2179697

Geocentric closest approach at 2028/08/03 20:47:48 UTC

J2000 position of star is 22:33:15.3 -09:33:57
Equinox of date position of star is 22:34:30.5 -09:26:33
Stellar brightness G=16.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 41 degrees from the moon. Moon is 98% illuminated.
Apparent brightness V=21.5

Object is 90.2 AU from the Sun and 89.3 AU from the Earth.
Apparent velocity is 24.8 km/sec on the sky relative to the star, or, 1.4 arcsec/hr.
The 1-sigma error in the time of the event is 147 seconds.
The 1-sigma cross-track error in the shadow position is 3835 km.

The object has an absolute magnitude Hv=1.9
Diameter=2500.4 km assuming a 5% albedo -- 103.8 sec chord
Diameter=1020.8 km assuming a 30% albedo -- 42.4 sec chord
Dynamical classification is 10:3EEEEEEE
 
 
 
 
 
 
 
 

Star training set for 225088, (2028/08/03 20:46UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:59:13.3 -29:28:11  1.2 20.85  43
PPM 206598     22:39:52.0 -07:44:54  6.0  2.09  43
PPM 206508     22:35:36.9 -09:27:37  6.7  0.22  41
PPM 206498     22:35:03.6 -09:31:43  9.6  0.13  41
225088         22:34:45.5 -09:25:04 16.8        41
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 225088, (2028/08/03 20:46UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.6 -29:37:24  1.2 20.85  43
PPM 206598     22:38:22.3 -07:53:51  6.0  2.09  43
PPM 206508     22:34:06.6 -09:36:31  6.7  0.22  41
PPM 206498     22:33:33.4 -09:40:36  9.6  0.13  41
225088         22:33:15.3 -09:33:57 16.8        41
Positions are for J2000

Event circumstances last updated at 2023/10/28 00:51:14 UT

Marc W. Buie, Southwest Research Institute

RECON