OpenLayers: parsed GeoJSON points always display at coords(0 , 0) - vector

Question

this is the first time i use OpenLayers and i don't understand what i'm doing wrong.
I try to display a simple point parsed from GeoJSON. The data seems to be parsed correctly (i checked with the console) but whatever point i give, it always displays at a position i guess to be LonLat(0,0) on my vector layer.
What am i doing wrong ?
var map, baseLayer, placesLayer, geojsonParser ;
// data below have been simplified and reformated to enhance readability
var geojsonData =
{
"type":"Feature",
"geometry":
{
"type":"Point",
"coordinates":[-4.0280599594116,5.3411102294922]
},
"properties":
{
"id":273,
"name":"ABIDJAN"
}
};
$(document).ready(function(){
map = new OpenLayers.Map('map');
baseLayer = new OpenLayers.Layer.OSM();
placesLayer = new OpenLayers.Layer.Vector();
geojsonParser = new OpenLayers.Format.GeoJSON();
placesLayer.addFeatures(geojsonParser.read(geojsonData));
map.addLayers([baseLayer,placesLayer]);
map.setCenter(
new OpenLayers.LonLat(-4, 5.3).transform(
new OpenLayers.Projection("EPSG:4326"),
map.getProjectionObject()
), 5
);
}); // document ready

Answer 1

This is the right solution:
var geojson_format = new OpenLayers.Format.GeoJSON({
'internalProjection': new OpenLayers.Projection("EPSG:900913"),
'externalProjection': new OpenLayers.Projection("EPSG:4326")
});
source: https://gist.github.com/1118357

Answer 2

Hi it sounds like you need to transform the long/lat coordinaites into the correct display coordinates:
You can either declare the projections and then transform your geometry feature:
var projWGS84 = new OpenLayers.Projection("EPSG:4326");
var proj900913 = new OpenLayers.Projection("EPSG:900913");
feature.geometry.transform(projWGS84, proj900913);
Or get the map projection "on the fly" more like this:
var projWGS84 = new OpenLayers.Projection("EPSG:4326");
feature.geometry.transform(projWGS84, map.getProjectionObject());
Obviously if you are using a different input projection from me change "ESPG:4326" to whatever you require.
HTH
C
EDIT:
In your case you would need to write something like:
geojsonData.geometry.transform(projWGS84, map.getProjectionObject());