geolocation - MySQL Distance Query -

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i have query tries objects around radius of 5 km. there 1 object a, gets results, if calculate distance of center , object coordinates around 10.772 km. why results?

center (berlin)

loc_lon: 13.406290000000013

loc_lat: 52.524268

object coordinates (data inside table "objects")

long: 13.260820

lat: 52.485661

convert center coordinates radians:

$loc_lon = $loc_lon / 180 * m_pi; $loc_lat = $loc_lat / 180 * m_pi;

query:

select id, title, loc_lat, loc_lon objects ( 6368 * sqrt(2*(1-cos(radians(loc_lat)) * cos(0.9167214137999) * (sin(radians(`loc_lon`)) * sin(0.23398390097719) + cos(radians(`loc_lon`)) * cos(0.23398390097719)) - sin(radians(loc_lat)) * sin(0.9167214137999))))  between 0 , 5


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