****************************************************************************** dorismail 12-Jan-2026 15:59:25 Message No 1464 ****************************************************************************** Author: Jerome Saunier Subject: Network/ new point TRISTAN DA CUNHA #### BEGIN HEADER #### DORISMail version 1.2 Subject: Network/ new point TRISTAN DA CUNHA #### END HEADER #### Dear colleagues, The DORIS antenna at TRISTAN DA CUNHA has been replaced to overcome power loss and disruption on the 400MHz channel. Please find below the installation characteristics and the coordinates of the reference point : Concerned site: #### BEGIN SITE #### Site name : TRISTAN DA CUNHA #### Site DOMES number : 30604 #### #### END SITE #### Characteristics of the new point: #### BEGIN STATION #### Four character ID : TRJC #### Antenna model : Starec C #### Station DOMES number : 30604S004 #### Date installed (dd/mm/yyyy) : 29/12/2025 #### Antenna support type : 3 m high very rigid metal tower #### Installed on : concrete pad #### #### END STATION #### The coordinates of the DORIS antenna reference point are: #### BEGIN COORDINATES #### Solution : dpod2020_050 #### Note about the coordinates : tie to TRJB #### Epoch : 2000.0 #### Unit : metre #### X : 4978474.7631 #### Y : -1086612.1356 #### Z : -3823190.4377 #### Sig X : #### Sig Y : #### Sig Z : #### #### END COORDINATES #### The ITRF velocities for the site are: #### BEGIN VELOCITIES #### Note about the velocities : dpod2020_050 #### Unit : metre / year #### VX : 0.01261 #### VY : 0.01875 #### VZ : 0.01569 #### Sig VX : #### Sig VY : #### Sig VZ : #### #### END VELOCITIES #### Replacing previous DORIS antenna : TRJB Date removed (dd/mm/yyyy) : 29/12/2025 Best regards, Jerome Saunier ________________________________________ Reseaux et Services en Geodesie Spatiale Service de Geodesie et de Metrologie IGN 73, avenue de Paris 94165 St-MANDE ign.fr - geoportail.fr